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DEPARTMENT OF THE INTERIOR UNITED STATES GEOLOGICAL SURVEY
TO ACCOMPANY MAP MF-866
GEOLOGIC ASPECTS OF TUNNELING IN THE LOS ANGELES AREA*
By R. F. Yerkes, J. C. Tinsley, and K. M. Williams
INTRODUCTION
In July 1975 the U.S. Department of Transportation commissioned a study of geologic and hydrologic aspects of downtown Los Angeles and adjacent areas as they would affect tunneling for subways. The objective is to collect, evaluate, and integrate available informa tion as an initial basis for more detailed feasibility, alinement, and design studies. Although a considerable volume of relevant surface and shallow subsurface data was obtained from public and private files, much of it originally was collected for other purposes, most is unpublished, and none has been integrated into a three- dimensional study for the purpose at hand. Thus, the report is not intended to be site-specific, as the required quantity and quality of data are not available. Instead, the report describes the general range, types, and distribution of tunneling conditions represented, and locates and describes the geologic-hydrologic factors that bear on route selection, more detailed geotechnical investigations, and excavation techniques.
The methods and limitations of the report are described and compared to a geologic investigation designed for the purpose of planning tunnels. The report then presents a brief summary of the geologic setting of the area, maps and sections that show surficial and shallow subsurface geology in units that characterize inferred tunneling conditions, the approximate position of the water table as of November 1974, the known or inferred distribution of faults and other potential hazards to tunneling, the location and content of wells and borings used as control points, and the location and magnitude of instrumentally recorded earthquakes through 1976. Finally, signifi cant gaps in data are discussed.
A geologic investigation designed for planning tunnels would 1) assess the regional tectonic-geologic setting where relevant, such as in areas of seismic activity and active faults, review the general lithol- ogy and structure of the local area, and summarize case histories of existing tunnels; and 2) include field studies designed to assess alternative routes and plan for more detailed drill-hole investigations appropriate to the terrain, specific alinements, and ground-water conditions. The objective of such site- specific studies would be to determine 1) the engi neering properties of the materials to be excavated-- what methods of excavation would be most efficient and what difficulties or hazards should be anticipated, and 2) how the materials will behave after excavation.
METHODS AND LIMITATIONS
The present report is a compilation of data initially collected by others largely for other purposes. Surficial geology (sht. 1) was adapted chiefly from Lamar (1970, pi. 1), supplemented by the studies of Hoots (1931), Jennings and Strand (1969), Thomas, Landry, and Turney (1961), and Byer (1968). Each of these investigations was made for purposes other than mapping and describing geotechnical properties relevant to tunneling. Similarly, the wells and boreholes mapped, were, with the exception of the shallow borings along Freeways and the "Wil- shire Corridor" (section A-D, sht. 4), drilled for purposes other than obtaining geotechnical properties of materials at depth.
Such relevant detailed data as mineral type, grain- size range, distribution and relative density, percentage, type and size of rock fragments, permea bility and porosity, type and degree of cementation, type, orientation, and distribution of joints, width and attitude of faults and type of material within the fault zone, details of weathering, details of rock structure, hardness, unusual water conditions,
*Prepared in cooperation with the U.S. Department of Transportation
and many others, commonly are not collected systemati cally during general-purpose geologic investigations of the sort upon which this report is based. Consequently, the inferred correlation between geologic aspects and tunneling conditions is based chiefly on generalized lithologic descriptions of the units where exposed to weathering, plus topical studies by Terzaghi (1950), Brandt, Stone, Smith, Willis, and Pastuhof (1970), Proctor (1971, 1973), Peck, Hendron, and Mohraz (1972), and Heuer (1974, 1977).
Precision
The topographic contours of the base maps generally are accurate to one-half contour interval; the contour interval is 20 ft for the Hollywood and Los Angeles quadrangles (the area south of lat 34°07'30") and 40 ft for the Burbank and Pasadena quadrangles (north of lat 34°07'30"). On these base maps the true relative horizontal location of features originally observed by others cannot be more precise than about 100 ft.
The water-table and bedrock contour maps were derived by interpolation between irregularly-spaced, locally sparse wells and borings. Because of errors in location of the wells, plus irreducible errors in vertical control, the true location in space of a point on a given contour cannot be more precise than about 150 ft horizontally and 25 ft vertically. The sections were derived by projection from the mapped data; there fore the precision of location of features on the sections is dependent on that of the maps, as well as on imprecise control for vertical projection.
GEOLOGIC-TECTONIC SETTING
The structural setting of the map area (fig. 1) includes parts of several structural blocks that make up the Los Angeles basin area and is traversed by elements (York Boulevard, Elysian Park, and Hollywood faults, sht. 1-A) of major zones of faults that in general form the south boundary of the western Trans verse Ranges (for example, the south boundary of the Santa Monica and San Gabriel Mountains). (See Lamar, 1970, 1975; Yerkes and others, 1974, for additional details).
Unlike most of the structural features of coastal California, which trend northwest-southeast, those of the Transverse Ranges, such as the Santa Monica Moun tains, all trend east-west. The continuing earth quakes, faulting and mountain-building activity in the western Transverse Ranges are believed to reflect the influence of relative motions along the San Andreas fault. Because of the configuration of the San Andreas in this part of California, the relative motion of the crustal blocks adjoining the fault results in strong north-south compressive stresses over a broad area of southern California, including the western Transverse Ranges. The compression is reflected in the Southern California uplift (Castle and others, 1976) and relieved in part by movement on the faults concentrated near the south boundary of the western Transverse Ranges. Some of these faults are seismically active (fig. 2). The 1971 San Fernando earthquake (magnitude 6%) occurred on one element of the zone; the 1973 Point Mugu earthquake (M 6.0) occurred on a western continua tion of the zone that includes the Hollywood fault; and elements of the boundary zone coincide with the south limit of the Southern California uplift. Geologic evidence at all scales indicates that faulting and related tectonic deformation have been continuing in this part of southern California for several million years; there is no reason to expect significant changes in the rate or mode of deformation.
The oldest bedrock units of the map area (sht. 1) consist of deeply-weathered, generally soft and crumbly
118-30' 118-15'
UPPER MIOCENE TO PLEISTOCENE SEDIMENTARY ROCKS AND TERRACE DEPOSITS
UPPER CRETACEOUS AND EARLY TERTIARY SEDIMENTARY ROCKS, MINOR VOLCANICS
BASEMENT COMPLEX
FERNANDO
VALLEY
Area of Sheets ->
1,2,3
LOS ANGELES BASIN
Figure 1. Generalized geologic map of the Los Angeles region showing major Quaternary faults in or near the western Transverse Ranges and area of sheets 1,2, and 3. Identified faults are elements of the south boundary zone of the western Transverse Ranges; ER, Eagle Rock; MC, Malibu Coast; RH, Raymond Hill; SF, San Fernando; S-H, Santa Monica-Hollywood; SM, Sierra Madre. Faults are dashed where approximately located, dotted where inferred or concealed. 1971, epicenter of the 1971 San Fernando earthquake.
iiy so" Myia"
Magni tude
<4
4-5.2
6.4
EXPLANATION
Sources of data
CIT-SF 2/9-12/31/71
a
n
USC CIT 5/71-12/76 1932-1970
O A
O ASan Fernando
Main shock - 2/9/71
FAULTS
Dashed where approximately located, dotted where inferred or concealed
0
Normal, reverse, or strike slip
Thrust or detachment
SCALE0 5 1? miles
10 20 km
- 34° 15
* a * A * * \. ~ "~
O * A a a o^ 6Q 6 Z_!^ 6 o && ",& a & « \ 6 «
°* * *<£ O\OOA *°A^ a A o\ o* *________P . 0 \ ° A ^ \l ^^ -*) o
34° 00"
Figure 2. Map showing instrumentally-located earthquake epicenters in the Los Angeles area for various periods since 1932. CIT-SF, California Institute of Technology, special investigation, San Fernando earthquake (Whitcomb and others, 1973; Alien and others, 1975); USC, University of Southern California (Teng, 1977); CIT, California Institute of Technology (Hileman and others, 1973).
dicritic rocks of the basement complex, which are exposed in the north part of the map area. The base ment rocks are faulted against younger sedimentary rocks (Topanga, Puente, and Fernando Formations of Lamar, 1970), which vary in thickness and lithology from fault block to fault block and within a given fault block. The sedimentary rocks, including the youngest bedrock units exposed, are tightly folded along generally east-trending axes (see Lamar, 1970, pi. 1 for details).
Uplifted and dissected, slightly consolidated alluvial terrace deposits are present in the south part of the area both west and east of the Los Angeles River (sht. 1-B). Deposits of late Pleistocene age are known to be folded and faulted in nearby areas of the basin.
Dissected, slightly consolidated old alluvium generally covers lowland areas east and west of the Los Angeles River and is inferred to be buried beneath alluvium of the river where it locally contains many boulders (section E-F, sht. 4). These deposits are inferred to be cut at depth by a strand of the Holly wood fault on the basis of ground water evidence (section E-F, sht. 4); immediately east of the map area deposits of late Quaternary age are offset at the ground surrace along the Raymond Hill fault (fig. 1; Wentworth and others, 1970).
Unconsolidated to slightly consolidated bouldery gravel, sand, and silt make up the alluvial deposits of the rivers and flood plains. These deposits are not known to be faulted at the ground surface and at depth they cannot be differentiated from buried old alluvium on the basis of available evidence. However, the abundant evidence of geologically young deforma tion, such as faulted water-bearing deposits (section E-F, sht. 4), indicates that such effects as impounded water should be anticipated along the trends of all the more extensive faults where tunneling in alluvium near or below the water table.
TUNNELING CONDITIONS
Important geologic factors that bear on the type of tunnel boring machine (TBM) to be used, rates of advance, and hence cost of tunneling are 1) the type and uniformity of ground to be excavated, especially whether it is mixed face or bouldery; and 2) whether the tunnel is above or below the water table. (See Brandt and others, 1970, p. F-24;Peck and others, 1972, p. 261-262; Schmidt, 1974). Full-face rotary-head boring machines may have difficulty coping with boulders; although openface hoe-excavator or "digger" - type machines have been designed to handle boulders up to 2 ft or so in diameter (the width of the conveyor belt), the unsupported face may fail, especially if in saturated ground (see app., Metropolitan Water Dist. San Fernando tunnel).
The tunneling characteristics of soils may change drastically with their position relative to the water table. Cohesive clay soils are stable when the ratio of shear strength to overburden pressure is great enough, a characteristic that generally will be independent of water table. Non-cohesive clay-poor sediment below water table is usually flowing around and must be dewatered or stabilized by other means; above water table, it may be running or slow raveling. A deposit with high permeability such as well-graded coarse-grained sand may be the source of large inflows of water below water table. Some materials, such as saturated silt, have a very low compressive strength below the water table, leading to sloughing, caving, and overbreak problems.
The earth materials at tunnel depths in the map area range from very firm or firm dry soft rock, generally well suited for tunnel boring machines, to possibly running or flowing ground where unconsoli- dated or slightly consolidated surficial deposits are locally below the water table. Hard rock conditions
''may exist locally north of the Hollywood and Eagle Rock faults.
The maps (shts. 1, 2) summarize available data
relevant to tunneling conditions; sheet 1 shows the surface distribution of relatively unconsolidated deposits and bedrock units, faults, approximate depth to ground-water, distribution of near-surface petroleum deposits, and instrumentally recorded earthquake epi centers (fig. 2). Sheet 2 shows the surface distribu tion of exposed bedrock and the approximate depth to bedrock (or thickness of relatively unconsolidated deposits) in areas where it is buried.
Sheet 3 shows the locations of about 885 wells and borings for which adequate locations and lithologic logs could be obtained; the locations are keyed by number to a register of basic data (operator, elevation, total depth, generalized sequence of geologic units) extracted from the logs (table 1).
The sections (shts. 4, 5) integrate the available data at tunneling depths along representative aline- ments: generalized geologic structure, approximate location of the water table in 1974, general tunneling conditions as inferred from geologic data, and known difficult or potentially hazardous tunneling conditions. The tunneling conditions indicated on the sections are inferred from the map distribution and general lithology of the geologic units, their position relative to the water table, and the topical discussions of Terzaghi (1950), Brandt, Stone, Smith Will is, and Pastuhof (1970), Proctor (1971), and Heuer (1974); suitably detailed data on the subsurface geometry of the various rock-soil units and their geotechnical prop erties are not presently available. Table 2 defines the terms used for tunneling conditions.
Tunnel advance rates
Representative tunnel advance rates for materials above 250 ft subsurface in the Los Angeles area have been estimated by Heuer (T977). The estimates are for a fully-shielded tunneling machine and include installation of segmented precast concrete tunnel lining; the estimates apply to either "digger"-type or rotating face machines.
Alluvial deposits above water table: 100 ft per (24-hr work) day.
Alluvial materials below water table: 40 ft per day; includes time for drilling horizontal drains ahead of the tunnel face.
Oil-saturated materials: 40 ft per day, averaged over 1000 ft of tunnel; but determination of specific conditions requires exploratory borings along selected route.
Fault zones in sedimentary rocks: 20 ft per day. Assumes need for "feeler" holes, problems with face stability, high water inflow, and some shutdown for ventilation of gas.
Consolidated sedimentary rocks: 80 ft per day, independent of specific rock type and ground water level.
Geotechnical properties
Measured geotechnical properties generally are lacking except in the area traversed by section A-D (shts. 1, 4), where in situ penetration tests were made on surficial deposits and the younger bedrock units; the tests were made in 1962, at 5-ft vertical intervals in 47 shallow borings distributed over a distance of 4.5 mi, during exploration of the "Wilshire Corridor" of a proposed rapid transit system. Pentration counts were taken with a 2-inch split-spoon sampler driven by a 140-lb hammer dropped 30 inches. Data from the logs of the borings (Kaiser Engineers, 1962), grouped by geologic unit and Unified Soil Classification, are plotted against depth in Figure 3. Most of the data are from depths
The buried bedrock surface mapped on sheet 2 is in ferred to be the boundary between consolidated sedi mentary rocks of the Fernando Formation or older units and overlying relatively unconsolidated materi als of the San Pedro Formation and younger units.
of 60 ft or less and thus do not apply directly to materials at greater depths.
The penetration data show that competence of the materials generally increases with depth. Penetration data for sands can be associated qualitatively with relative density and those for clays with consistency and unconfined compressive strength (table 3). If the measured counts are representative of the alluvial deposits in this area, with extrapolated blow counts greater than 40 per foot (at a subsurface depth of 50 ft), they can be characterized as at least slightly consolidated and dense to very dense. Similarly, the shallow shale and siltstone bedrock materials in this area may be characterized as very stiff to hard in consistency.
Bouldery ground
Bouldery ground apparently is common down to at least 200 ft subsurface along the Los Angeles River north of the Pasadena Freeway (section E-F), as well as in the river deposits in the Union Station area (section C-D). Bouldery ground also should be expected in unconsoli- dated deposits in the south quarter of the area (south half of sht. 1-B). Approximately the upper 250 ft of deposits in this area contains the Recent alluvium and Lakewood Formations of Thomas, Landry, and Turney (1961): Recent alluvium contains cobbles to 5 in. in diameter as well as "boulder gravel" (Thomas and others, 1961, p. 56-62). The logs of several shallow borings (to 50 ft subsurface) in this area cite gravel with cobbles as large as 8 in. in diameter.
Relatively unconsolidated deposits in the area be tween Glendale and the Los Angeles River (north half of sht. 1-B) are thicker than about 200 ft and are expected to contain numerous cobbles and boulders. Similarly, unconsolidated deposits in the area east of the Los Angeles River and between the San Bernardino and Santa Ana Freeways, although somewhat thinner (thickness not well known) are expected to contain boulders and cobbles.
Case history
A relevent case history has been reported by Heuer (1976, Case B, p. 281-282). A tunnel 22 ft in diameter was being excavated by a fully shielded backhoe-type "digger" machine through alluvial and alluvial fan deposits at the south margin of the westernmost San Gabriel Mountains about 15 mi northwest of the map area. Very rapid tunneling progress was made through the relatively dry, unconsolidated but locally cemented clayey silt, sand, and gravel where above the water table. Pumping tests prior to excavation indicated an "average permeability of 10~ 2 to 10" 3 cm/sec" for these materials. In a section bounded by faults which acted as natural dams, the water table was about 40 ft above the tunnel, which had about 135 ft of cover. An attempt was made to advance the tunnel through this section without prior dewatering, but difficulty was had with flowing ground and caving of the face, where water flows of several hundred gallons per minute were reported. On several occasions complete collapse of the face occurred with inflows of several thousand gallons of water and soil in a few seconds. The ground overhead caved upward and ahead of the machine to the "bottom of a harder silty layer" (as quoted by Heuer) at or near the natural water table about 95 ft below the gound surface. During one of several such runs the cavity propagated upward through dry ground to the surface and formed a hole 10-15 ft in diameter. The water problem eventually was controlled by dewatering the ground just ahead of the machine with numerous 3- to 4-inch diameter holes drilled horizontally about 200 feet ahead of the tunnel face.
Ground water
The present map area is within the Los Angeles Fore- bay Area of the Central Basin Pressure Area of Thomas, Landry, and Turney (1961, pi. 2), which comprises much of the lowland plain traversed by the Los Angeles River. The forebay area is chiefly one of free groundwater
rather than one containing confined aquifers, as in much of the area to the south. A number of aquifers and intervening aquieludes have been identified and mapped below a depth of 60 feet subsurface. The degree of saturation of aquifers below the water table probably varies with degree of hydraulic continuity across intervening aquieludes; all of the deeper aqui fers are shown to be truncated and thus in hydraulic continuity with the lower of two young aquifers in the area where Whittier Boulevard intersects the Los Angeles River (Thomas and others, 1961, section K-K', pi 6E).
Depth to ground water south of the Santa Monica Freeway is unknown except in the Vernon area, where it was approximately 200 ft in November 1974. Interpola tion of sparse data on regional-scale maps of the Los Angeles County Flood Control District indicates that depth to the November 1973 water table in the southwest part of the map was approximately 150 ft or greater (Los Angeles County Flood Control District, 1975, p. 281).
The depth and configuration of the water table in areas of exposed sedimentary rock are unknown in detail, but it often is at 10 to 50 ft below topographic lows (Heuer, 1977). The depth to the base of fresh water in the Los Angeles City oil field is given as 150 ft (Calif. Div. Oil and Gas, 1974). No injection or local water disposal is carried on (Calif. Div. Oil and Gas, 1975, p.137, 149).
It is reported that during construction of the Pacific Electric subway tunnel (just south of Fourth Street, Sht. 2-B) in the mid-1920's, ground-water flowed into the tunnel at rates of about 17 gal per min; the abandoned, extant portions of the tunnel (west of Figueroa and east of Hope) are still pumped regularly to control ground-water flows (data from A. Dennis, Engi neer of the Street Opening and Widening Division, Bureau of Engineering City of Los Angeles, written commun., Oct. 4, 1976). Heuer (1977) states that tunnel-face flows of a few tens of gal per min may be expected from the cleaner, coarser-grained sandstone beds and that much of the rock is expected to be only damp to dripping in tunnel. Proctor (1977, written commun.) states that some tunneling experience in rock in and near downtown indicates that water inflows generally do not cause hazardous (caving) conditions, probably because of a greater degree of consolidation and cementation.
A tunnel at a depth 50 ft subsurface generally along the Harbor Freeway and Flower Street would be dry (section G-H, sht. 5), whereas one at that depth along Seventh Street would be below a 1962 perched water table west of the Harbor Freeway (section A-B), and one generally northward along the Los Angeles River would be below the November 1974 water table from about First Street to about 1 mi south of the Glendale Freely (section E-F). Elsewhere in the map area the majority of tunnels at 50 ft subsurface would be dry on the basis of available data.
The elevation of the water table varies seasonally with recharge and demand as well as with depth of the aquifer being pumped; water levels generally are higher in the spring and lower in the fall. Recognized in creases in elevation of the water table between November 1974 and April 1975 were:
In the northwest part of the map area near the Santa Monica Mountains; 10 to 28 ft;
In the vicinity of Glendale, 3 ft;In shallow wells in the vicinity of the Glendale
Freeway, 3 to 11 ft;Just north of the Santa Monica Freeway, east of the
Harbor Freeway, 10 ft;In the vicinity of Vernon: deep wells, 6 ft; wells
less than 400 ft deep, no change.The ground-water data now available constitute only
a first approximation, and are not adequate to determine possible areas of perched water (see west end of section A-B, sht. 4), the degree of saturation of the materials below the water table, or to delineate the precise posi tion of the water table or its seasonal fluctuation along any given alinement. Such data could be obtained only from appropriately spaced and perforated observation wells,
40-
20-
60 Blows per foot
I I I I I I i I I I 1 I
I I I I I T
40 60 80
Blows per foot
100
T P
-40-
20-
60-
I I l
Tfsl (ML,CL)
"i I i I ^ | r20 40 60
J I I I I I I
Tpds
(CL.ML) eDry » Moist
i i r~40 60
Blows per foot
Figure 3.--Penetration test data from shallow borings (WC 75-WC 122, Kaiser Engineers, 1962) along section A-D (sheet 4), grouped by geologic unit and Unified Soil Classification. Blow counts taken with 2-inch split-spoon sampler, 140-lb. weight, dropped 30 inches. Qal/Qalo, allu vium; Tfsl, siltstone, Fernando Formation of Lamar (1970); Puente Forma tion of Lamar (1970): Tpds, diatomaceous shale and siltstone; Tpsl, siltstone and very fine-grained sandstone. Counts in gravel excluded; appreciable count differences in moist or wet vs. dry samples apparent only in Unit Tpds.
monitored at appropriate intervals.
Faults
Transportation routes in the Los Angeles area cannot avoid crossing potentially active faults, such as the Santa Monica-Hollywood-Raymond Hill, York Boulevard, or Eagle Rock (shts. 1, 2, 4, and 5). In bedrock the mapped fault traces generally constitute zones of crushed or slickensided rock that may be several tens of feet wide and extend downward, commonly at steep angles, beyond tunnel depths. In slightly consolidated or unconsolidated materials, the effects of faulting are more diffuse; instead of forming discrete ruptures that cut the rock materials, the fabric of grains and fragments is deformed by rearrangement. In both cases, faults are expected to form barriers or possibly con duits along which impounded ground water may enter a tunnel bore near or below the water table.
The Santa Monica, Hollywood, and Raymond Hill faults are classified as potentially active (no recognized historic activity, but may move again in the near future) on the basis of their tectonic setting and re lations to young geologic deposits (see Greensfelder, 1974; Wiggins and others, 1974, p. IV-19 to IV-21). These faults and the associated Elysian Park and York Boulevard faults are inferred to cut buried surficial deposits at tunneling depths. In addition, the Santa Monica-Hollywood-Raymond Hill zone is considered capa ble of generating on earthquake as large as magnitude 7.5 {Greensfelder, 1974). Since near-surface displace ment and surface rupture may be associated with earth quakes of magnitude 5 or larger on most California faults, such displacements, probably with a large component of vertical separation, may occur on one or more of those faults in the event of such an earthquake.
Petroleum
Local accumulations of petroleum (petroleum gas, free oil, asphalt or tar) and a few of hydrogen sulfide were found in shallow borings (generally above 50 ft subsurface) at several places between Seventh Street near the Hollywood Freeway and west of Harbor Freeway, in the downtown area, along the Los Angeles River north of the San Bernardino Freeway (section D-E), and around the intersection of the San Bernardino and Golden Freeways (sht. 1-B). The Los Angeles City oil field extends east-west across the map area north of section A-D and west of the Los Angeles River. The oilfield is characterized by shallow accumulations of petroleum, surface seeps, and more than 1250 wells, only 54 of which were active in 1974 (sht. 5; Calif. Div. Oil and Gas (1975, p. 78). Most of the wells were drilled during or before 1900, were not surveyed or otherwise accurately located, and the ground surface has since been developed for other uses. Consequently, no accurate record exists of the location of all the wells drilled, although Crowder (1961, pi. 2; this report, sht. 5) has mapped 1116 of them at a scale of 1:7,200.
Oil has been produced from very shallow depths in the field; early production was from hand-dug pits and surface seeps (Crowder, 1961, p. 68). The earliest drilled wells produced from depths as shallow as 140 ft. Structure sections of the field show that shallow petroliferous strata extend continuously along the length of the field from east to west and dip southward at about 30°, being exposed near and along the north boundary of the field and extending to depths of 500 to 1,000 ft subsurface along the south boundary (sht. 5). Gas and seeping oil were encountered in 1976 during excavation of a shallow storm drain through the field (see app., Los Angeles County Flood Control District).
Subsidence
The map includes parts of 3 areas of relatively small scale but areally extensive differential subsi dence. A northwest-trending elliptical subsidence bowl extends into the southwest part of the map from its center about 2 mi south. The 1968/69-71 rate of
subsidence at the center of the bowl was about 0.1 ft per yr with respect to Tidal 8, and at the south center of the map, the rate was about 0.066 ft per yr (Castle and others, 1975, fig. 5). Total subsidence at the center during 1926-64 was 1.64 ft, for an average of about 0.04 ft per year.
A second area of differential subsidence averages about 3.5 mi in diameter and centers near the axis of the Los Angeles City oilfield where it crosses the Los Angeles River. The rate of differential subsi dence at the center of this area during 1968/69-71 with respect to Tidal 8 was about 0.066 ft per yr (Castle and others, 1975, fig. 5).
The third area centers near Burbank, about 1 mi northwest of the map, but extends into the northwest corner of the map. A survey mark in the northwest corner subsided about 0.5 ft with respect to Tidal 8 during 1925-64; the 1968/69-71 rate was about 0.033 ft per yr (Castle and others, 1975, fig. 5).
GAPS IN DATA
Comparison of the data available for this study with those required for a specific investigation for tunneling reveals important gaps in both quality and quantity of essential data. These gaps are summarized below:
Ground water
Because of their significance to tunneling condi tions, the precise depth to the water table, the distribution of ground water below the water table, and the distribution of perched water should be known with great reliability. Perched water must be differ entiated from the permanent water table because the effects of perched water on tunneling are adverre and temporary.
If tunnel depths greater than 150 ft subsurface are considered for the area south of the Santa Monica Freeway, it may be necessary to determine the distri bution of ground water within the several aquifers and aquieludes reported for that area (Thomas and others, 1961, sections A-A', K-K 1 , pis. 6A, 6E). Similar considerations apply to the Glendale area in the north east part of the map.
Bouldery ground
As indicated by the records of numerous wells and boreholes, boulders to 3 ft in diameter or more and cobbles to 10 in. in diameter are wisespread but not uniformly distributed either geographically or V'ith depth, in most surficial deposits in the area. In stead, irregularly-shaped lenses of large and small boulders and cobbles characterize the surficial de posits in and near present and past flood plainr of the Los Angeles River and its tributaries. The size and number of boulders presumably decrease downrtream with decrease in carrying capacity of floods, brt this has not been demonstrated in any quantitative way for the present case.
The presence of boulders and cobbles is cited in table 1 where given in original sources. However, it is reasonable to assume that in most cases, boulders were cited only when they posed an obstacle to the tool, and their absence therefore cannot be assi-med where not noted, especially in surficial deposits in and near the Los Angeles River. To obtain reliable, quantitative data on the distribution and size of boulders along a given alinement, in order to estimate the efficienty and costs of different tunneling methods, the record presented here must be supplemented with many additional suitably located and loggec1 exploratory borings, especially where surficial depos its are to be traversed.
Petroleum
Shallow accumulations of petroleum - gas, asphalt tar, or free oil are potential safety hazards ard are locally common (sht. 1, table 1). As now known,
these accumulations occur in both bedrock and surficial deposits in an east-west band or zone about 1^ mi wide and generally north of Wilshire Boulevard on the west and San Bernardino Freeway on the east. This is the general area where south-dipping petroliferous bedrock strata are transgressed by younger materials. Shallow petroliferous strata are also fairly continuous and widespread in the Los Angeles City oilfield area (sht. 5); local shallow accumulations of petroleum deposits should be expected throughout the area of the field, as well as elsewhere in the zone.
Buried faults
Faults in bedrock constitute generally steep zones, as much as a few tens of feet wide, of brecciated or sheared rock, and thus are zones of relatively weak materials; in relatively unconsolidated deposits, fault zones may constitute barriers along which ground water may concentrate and enter a tunnel near or below the water table. The faults shown as buried by rela tively unconsolidated deposits (sht. 1) are based on projections of exposures in bedrock and sparse well control. The interpretation that some faults cut buried older parts of those deposits - instead of being buried by them (sht. 4) is based on the general tectonic regime of the area, an inferred ground water cascade along one of the faults,and geologically young activity. Because of lack of control, the precise location of the faults and their vertical extent in the buried deposits is unknown. Reliable location and characterization of the mapped faults, and delineation of others not presently mapped, depend chiefly on detailed correlation between suitably located explora tory boreholes, drilled or cored to bedrock, and logg ed by suitable methods (for a discussion of geophysi cal techniques of logging boreholes, see Alsup, 1974).
Bedrock
Only the most generalized lithologic and structural properties of exposed bedrock are known. Significant engineering properties, such as permeability, deform- ability, strength, mineral composition, range in size and distribution of rock fragments and mineral grains, type and degree of cementation, details of weathering and structure, and type and distribution of fluids, are known in only a general way (such as for two existing tunnels in the downtown area see app)., and for weathered materials only, or not at all. Precise data must be obtained from suitably spaced and logged exploratory borings along specified alinements.
Depth to the buried bedrock surface is known reasonably well only along the Los Angeles River (sht. 2A) and north of the Santa Monica Freeway (sht. 2B). Relevant data are completely lacking for much of the Glendale area, the area east of the river between the Pasadena and San Bernardino Freeways, and a particu- . larly critical area just east of Alameda Street north and south of section C-D, where both bedrock and the water table presumably are shallow. Although a number of bedrock-depth points are inferred for the area south of the Santa Monica Freeway, the bedrock surface there apparently is locally quite irregular and many more points are required to approximate its general config uration.
Tunneling conditions
The tunneling conditions (sht. 4, table 3) were inferred from very generalized descriptions of the geologic units as based on their surface exposures. Knowledge of relevant geotechnical and structural properties such as accurate geometric configuration of the various stratal units in the subsurface, their permeability (dewatering characteristics), cohesion, shear strength, range in size and distribution of mineral grains and rock fragments, type and degree of cementation, distribution and attitude of joints and distribution of saturated zones below the water table, are almost totally unknown in uniformly useful detail.
Tunneling conditions may vary significantly with each of these properties; the precise range and type of conditions along a specific alinement cannot be p^e- dicted from present knowledge, but can be determined only by systematic investigation and sampling designed for the purpose.
Subsidence
As presently known, subsidence probably would not pose a problem to construction of tunnels in the map area. If it is determined that differential subsidence of the ground surface at average rates up to about 0.1 ft per year over a distance of about 3 mi and inferred compaction of aquifers at and below tunnel depths are of consequence, the present-day extent and rates of the three areas of differential subsidence should be deter mined. As pumpage of fluids continues, at least in the northwest and southwest of these areas, it is reasonable to assume that differential subsidence and attendant shallow compaction may also.
Liquefaction potential
Liquefaction of clay-poor granular sediments h=>s produced severely damaging surface and near-surface ground failures such as those that occurred in Sylmar during the 1971 San Fernando earthquake (Thompson, 1971; Youd, 1971).
On an empirical basis the highest potential for liquefaction is present where water-saturated clay- poor granular sediments with relative densities less than 65 percent are present within about 50 ft of the ground surface. In a San Francisco Bay investigation, relative densities of 65 percent or less were found to correlate with penetration resistances of 20 or fewer blows per ft (Youd and others, 1975, fig. 49, p. A-71). Although it is not known that this combination of conditions is present in the map area, it is reasonable to assume that it may be present locally along th? Los Angeles River where the water table is shallow (section D-E, sht. 4). Exploratory borings made in such areas therefore should include tests for these criteria.
SUMMARY AND CONCLUSIONS
A 55-square-mile rectangular area underlain by relatively unconsolidated deposits or soft rock, extend ing northward from Vernon Avenue through the downtown business district of Los Angeles to Glendale and the Venture Freeway and traversed by the Los Angeles River, has been analyzed for the density, suitability, anH quality of existing geologic-hydrologic data requisite for initial studies of routing and designing tunnels for a rapid-transit system. Surface geologic data, hydro- logic records, and logs of about 885 wells and shallow borings have been collected, interpreted, and the results incorporated into maps and representative geotechnical sections that portray inferred, generalized tunneling conditions to depths of 100-300 ft subsurface. Even so, the distribution and quality of available data are in adequate for site-specific alinement, design, and cost analyses.
Abundant evidence illustrates the types and gen?ral distribution of tunneling conditions that exist in the map area. The downtown area and much of that to the south is underlain at tunnel depths by slightly co^soli- dated sand and gravel or siltstone-shale that should provide chiefly dry, firm tunneling conditions. R^tes of excavation in these materials for fully shielded TBM are estimated at 80-100 ft per (24-hr work) day. Much of the surficial deposits and bedrock in the latitude of the Los Angeles City oilfield contain petroleum such as gas, tar, or free oil at tunnel depths; strong ventila tion has been used to avoid problems in such areas (see app.). TBM rates are estimated at 40 ft per day f?r these conditions.
Much of the alluvium north of downtown contains boulders, and, where tunneled below the water table, may flow and form cavities that could propagate upward to the surface if precautions such as prior dewaterini are
not exercised. IBM rates in saturated alluvium are estimated at 40 ft per day. The 1974 water table was within 25 feet of the surface along parts of the Los Angeles River north of the San Bernard!no Freeway (section C-E sht. 4). To avoid saturated alluvium in this segment, a tunnel profile would have to be deep ened to more than 50 feet subsurface; depths of 200 feet or more would be required along the river between the Pasadena Freeway and Glendale Boulevard. The area north of downtown Los Angeles is traversed by several faults that may form barriers that locally impound groundwater; some of these faults also may be subject to movement. TBM rates in this terrain are estimated at 20 ft per day.
ACKNOWLEDGEMENTS
This report is based in large part on the logs of many hundreds of wells and borings, held by numerous agencies and organizations. We are indebted to the following for their important contributions in provid ing access to records, in discussions, or in thoughtful reviews:
California Department of Water Resources, SouthernDistrict, Los Angeles: D. J. Lewis and L. Vaughan
California Division of Mines and Geology, Los Angeles:C. H. Gray, Jr., R. L. Hill, and E. C. Sprotte
California Department of Transportation, Sacramento,Division of Structures: M. C. Heaney
California Division of Oil and Gas, Long Beach: A. D.Stockton
L. LeRoy Crandall and Associates, Consulting Geotech- nical Engineers, Los Angeles: G. A. Brown, Direc tor of Geological Services, and L. LeRoy Crandall
California Water Resources Control Board, Division Water Rights: Wilbert T. Chung, Senior Engineer and Engineer in Charge
City of Glendale: W. E. Cameron, Director of PublicWorks
City of Los Angeles: Department of Building Safety, R. M. Oberlies, Chief, Grading Division; J. Cobarrubias, Geologist; and A. Sanchez, Grading Inspector Department of Water and Power
M. L. Blevins, Hydro!ogist-Engineer Associate S. H. Mayeda, Engineering Geologist Jack We!don, Geologist
County of Los Angeles,Office of Supervisor Baxter Ward:
G. B. Leonard, Senior Deputy, Transit Specialist Department of County Engineer, Geologic Section:
A. G. Keene, Head Engineering Geologist R. Ramirez, Engineering Geologist
Department of Facilities, Architectural Division:A. Fisch
Flood Control District, Materials Engineering Divi sion:
H. A. Kues, Supervising Engineering Geologist J. N. Roth, Senior Engineering Geology Assistant A. Roodsari, Supervising Civil Engineering
AssistantWilliam Stampf1, Supervising Civil Engineer
Flood Control District, Water Conservation Division: Groundwater Studies and Operations Section
Rodney H. Chow, Supervising Engineer Carl E. Arnold William Young
Department of Roads:G. S. Iwanaga
Kaiser Engineers, Los Angeles and Oakland Metropolitan Water District of Southern California,
Los Angeles:R. J. Proctor, Chief Geologist
Parsons Brinckerhoff Quade and Douglas, Inc., San Francisco:Birger Schmidt, Project Engineer
Southern California Rapid Transit District, Rapid Transit Department:R. C. Gallagher, Manager and Chief Engineer N. P. Richards : Project Engineer
City of Vernon, Department of Public Works:V. H. Vaits
U.S. Army Corps of Engineers, Los Angeles District,Section:L. J. Lauro, Engineer in Charge
E. B. Waggoner, Independent Consultant
REFERENCES CITED
Alien, C. R., Hanks, T. C., and Whitcomb, J. H., 1975, Seismological studies of the San Fernando earthquake and their tectonic implication: Calif. Div. Mines and Geology, Bull. 196, p. 257-262.
Alsup, Stephen, 1974, Recommended borehole investiga tion system for soft ground, in Subsurface explora tion for underground excavation and heavy corstruc- tion, Proc. Specialty Conf., Aug. 11-16, 1974: Am. Soc. Civil Engineers, Geotech. Eng. Div., p. 117- 127.
Brandt, C. T., Stone, R. B. Smith, A. R., Willis, B. H., and Pastuhof, A., 1970, A systems study of scft ground tunneling: Federal Railroad Amin. anc1 Urban Mass Transportation Admin., 58 p., app. A-F; avail able from the Nat'1. Tech. Inf. Service U.S. Dept. Commerce, Springfield, Va., NTIS PB 194769.
Byer, J. W., 1968, Geologic map of part of the 5an Rafael Hills [Los Angeles County, California]: Unpub. map for the City of Glendale, California, scale 1:24,000.
California Division of Oil and Gas, 1974, California Oil and Gas Fields, v. II, South, Central Coastal and Offshore California: Report No. TR 12, unpaged.
1975, Sixtieth Annual Report of the State Oiland Gas Supervisor [for 1974]: Report No. PRO 6, 175 p.
Castle, R. 0., Church, J. P., Elliott, M. R., ard Morrison, N. L., 1975, Vertical crustal movements preceding and accompanying the San Fernando earth quake of February 9, 1971: A summary: Tectono- physics, v. 29, p. 127-140.
Castle, R. 0., Church, J. P., and Elliott, M. R., 1976, Aseismic uplift in southern California: Science, v. 192, p. 251-253.
Crowder, R. E., 1961, Los Angeles City oil field: Summary of operations, California Div. Oil and Gas, v. 47, no. 1, p. 67-78.
Greensfelder, R. W., 1974, Maximum credible rockacceleration from earthquakes in California: Cali fornia Div. Mines and Geology, map sheet 23, scale 1:2,500,000.
Heuer, R. E., 1974, Important ground parameters in soft ground tunneling, in Subsurface exploration for underground excavation and heavy construction, Proc. Specialty Conf. Aug. 11-16, 1974: Am. Soc. Civil Engineers, Geotech. Eng. Div., p. 41-55.
1976, Catastrophic ground loss in soft groundtunnels, in Proc. 1976 Rapid Excavation and Tunneling Conf. June 14-17, 1976: Am. Soc. Civil Engineers, p. 278-295.
__ 1977, Preliminary geologic report, ij^ Cost and operational analysis of alternative concepts for underground rapid transit systems: prepared by Underground Technology Development Corporation for Jet Propusion Laboratory study for the U.S. Depart ment of Transportation, v. II-C, p. A-2 to A-13.
Hileman, J. A., Alien, C. R., and Nordquist, J. M., 1973, Seismicity of the southern California region 1 January 1932 to 31 December 1972: Calif. Inst. Technology, Div. Geol. and Planet. Sciences Contrib. No. 2385, 83 p.
Hoots, H. W., 1931, Geology of the eastern part of the Santa Monica Mountains, Los Angeles County, Cali fornia: U.S. Geol. Survey Prof. Paper 165, p. 83- 134, map scale 1:24,000.
Jennings, C. W., and Strand, R. G., 1969, Geologic map of California Los Angeles sheet: California Div. Mines and Geology, scale 1:250,000.
Kaiser Engineers, 1962, Test boring logs, rapid tran sit system backbone route: Prepared for the Los Angeles Metropolitan Transit Auth., v. 4, logs WC-75 to WC-122.
Lamar, D. L., 1970, Geology of the Elysian Park-Repetto Hills area, Los Angeles County, California: California Div. Mines and Geology Spec. Rept. 101, map scale 1:24,000.
___ 1975, Relationship between the Hollywood and Raymond Hill faults, in_ Byer, J. W., chm., Sycamore Canyon fault, Verdugo fault, York Boulevard fault, Raymond fault, and Sierra Madre fault zone: Assoc. Engineering Geologists, Field Trip Guidebook, app. II, p. 43-47, Sept. 27, 1975.
Los Angeles County Flood Control District, 1975, Hydro- logic report 1973-74: Los Angeles County Flood Control Dist., 285 p., maps at scale about 1:202,210.
Peck, R. B., Hendron, A. J., Jr., and Mohraz, B., 1972, State of the art of soft-ground tunneling, in Proc. North America Rapid Excavation and Tunnel ing Conf. June 5-7, 1974: Am. Soc. Civil Engineers, p. 259-286.
Proctor, R. J., 1971, Mapping geological conditions in tunnels: Assoc. Eng. Geologists Bull., v. 8, no. 1, p. 1-43.
1973, Geology and urban tunnels-including a casehistory of Los Angeles; in_Moran, D. E., Slosson, J. E., Stone, R. 0., and Yelverton, C. A., eds., Geology, seismicity, and environmental impact: Assoc. Eng. Geologists Spec. Pub. Oct. 1973, p. 187-199.
Schmidt, Birger, 1974, Exploration for soft ground tunnels--a new approach, in Subsurface exploration for underground excavation and heavy construction, Proc. Specialty Conf. Aug. 11-16, 1974: Am. Soc. Civil Engineers, Geotech. Eng. Div., p. 84-96.
Teng, T. L., 1977, Summary report on research on earthquake prediction and control in the Los Angeles basin and adjacent area, in Summaries of technical reports submitted to National Earthquake Hazards Reduction Program, v. Ill, p. 123-125.
Terzaghi, Karl, 1950, Geologic aspects of soft-ground tunneling, jjlTrask, P. D., Applied sedimentation: New York, John Wiley and Sons, p. 193-209.
Terzaghi, Karl, and Peck, R. B., 1967, Soil mechanics in engineering practice (2d ed.): New York, John Wiley and Sons, 729 p.
Thomas, R. G., Landry, J. J., and Turney, R. J., 1961, Planned utilization of the ground water basins of the coastal plain of Los Angeles County, App. A., Ground water geology: California Dept. Water Resources Bull. 104, 181 p., maps at scale approxi mately 1:126,720.
Thompson, J. H., 1971, Damage to the Los Angeles County juvenile facilities, Sylmar, jj^ The San Fernando, California, earthquake of February 9, 1971: U.S. Geol. Survey Prof. Paper 733, p. 191- 192.
Wentworth, C. M., Ziony, J. I., and Buchanan, J. M., 1970, Preliminary geologic environmental map of the greater Los Angeles area, California: U.S. Geol. Survey Rept. TID-25363, 41 p., map scale 1:250,000; available from the Clearinghouse for Fed. Sci. and Tech. Inf., Natl. Bur. Standards, U.S. Dept. Commerce, Springfield, VA 22151.
Whitcomb, J. H., Alien, C. R., Garmany, J. D., and Hileman, J. A., 1973, San Fernando earthquake series, 1971: focal mechanisms and tectonics: Rev. Geophys. and Space Physics, v. 11, no. 3, p. 693-730.
Wiggins, J. H., Lee, L. T., Ploessel, M. R., and Petak, W. J., 1974, Seismic safety study City of Los Angeles: Tech. Rept. 74-1199-1, 253 p., 12 maps (by Engineering Geology Consultants, Inc.) at scale approximately 1:140,800.
Yerkes, R. F., Bonilla, M. G., Youd, T. L., and Sims, J. D., 1974, Geologic environment of the Van Norman reservoirs area: U.S. Geol. Survey Circ. 691-A, p. A1-A35.
Youd, T. L., 1971, Landsliding in the vicinity of the Van Norman Lakes, jn^The San Fernando, California, earthquake of February 9, 1971: U.S. Geol. Survey Prof. Paper 733, p. 105-109, map scale approximate ly 1:24,750.
Youd, T. L., Nichols, D. R., Helley, E. J., and LaJoie, K. R., 1975, Liquefaction potential, in Borcherdt, R. D., ed., Studies for seismic zonation of the San Francisco Bay region: U.S. Geol. Survey Prof. Paper 941-A, p. A68-A74.
10
Tabl
e IA.
Wells
and
shal
low
bori
ngs
shown
on sheet
3A (N
orth
Sh
eet)
Map
No.
2700
A
2700
B
2700
C
2701 A
2710 B
2710
C
2710 D
2710 F
2710
G
2710
H
2710
J
2710
K
2710
L
2710
M
2711
A
2711 B
2711 C
2711 D
2711 E
2721 A
Operator-^
PC Hosp.
Hosp.
PC DWP
DWP
DWP
PC PC Hosp.
Hosp.
Hosp
.
Hosp.
Hosp.
LACFCD
LACFCD
LACFCD
LACFCD
LACFCD
LACFCD
Designation
or Pu
rpos
e
foundation
foun
dati
on
foun
dati
on
foun
dati
on
water
wate
r
water
foun
dati
on
foundation
foundation
foun
dati
on
foun
dati
on
foundation
foundation
storm
drai
n
storm
drain
storm
drai
n
storm
drain
storm
drai
n
storm
drain
Elev.
(feet)
380-
387
385
320+
377+
376-
362+
330+
370+
393+
388+
377
384
384
321 +
310+
299+
293+
299+
355+
Total
Depth
(feet)
21 25 40 25 107
114
81 45 90 35 40 24 36 35 28 20 15 5-5
OJ 33 22
Geology
(dep
ths
in fe
et)
0-10:
Qalo
10-20: be
droc
k
0-12:
Qalo
12-25: be
droc
k
0-6: af
6-
11:
Qalo
11-40: be
droc
k
0-21:
Qalo
21
-25:
be
droc
k
0-23
: Qalo
23-1
07:
bedr
ock
0-11
4: Qa
lo
0-81:
Qalo
0-19:
af
19-43: Qa
lo
43-4
5: be
droc
k
0-41
: Qalo
41-9
0: be
droc
k
0-28
: Qalo
28-3
5 -.
bedr
ock
0-13:
af
13-30: Qalo
30-4
0: be
droc
k
0-20
: Qa
lo
20-2
4: be
droc
k
0-4:
af
4-32
: Qa
lo
32-3
6: be
droc
k
0-19
: Qa
lo
19-3
5: be
droc
k
0-28
: Qa
lo
0-20:
Qalo
0-15
: af,
Qalo
0-33:
Qalo
0-7: Qalo
7-33:
bedr
ock
0-22
: Qa
lo
Bedr
ock
shale
shale
silt-
stone
shale
gran
ite
shale
shal
e
shale
shale
shale
shal
e
shal
e
silt-
ston
e
Rema
rks
(dep
ths
in fe
et)
Shale
moderately cemented.
Shale
decomposed a
nd w
eath
ered
.
Siltstone
decomposed a
nd w
eathered
32:
Wate
r seepage, 7/22/62.
Shale
with
thin sa
ndst
one
laye
rs.
21:
Water
seepage, 2/19/70.
Gran
ite
deco
mpos
ed.
3-23
: Ha
rd pa
n
Shale
very ha
rd.
0-19
: Raveling.
30:
Wate
r le
vel,
8/17/67.
70-7
5, 80
-73:
Moderately cemented.
20:
Wate
r le
vel,
8/
4/70
.
Shal
e we
athe
red.
Shal
e we
athe
red,
30
: Wa
ter
level, 7/22/62.
Shal
e weathered
and
fractured.
Shal
e weathered
. 30:
Wate
r le
vel,
7/22/62.
Shale
weat
here
d.
34:
Wate
r le
vel
, 7/22/62.
14:
Water
seepage, 10/7/69.
Siltstone
very d
ense
at b
ase.
8:
Water
seepage, 12/9/69.
12:
Water
encountered, 4/25/68.
Map
No.
2721 B
2730 A
2730 B
2730 C
2731
A
2731
C
2731
G
2731
H
2740 A
2741 A
2741 B
2741
C
2741
F
2750 A
2750 B
2750 C
2750 D
2750
E
2750
F
2750
G
2750 H
Oper
ator
-'
LACFCD
LACFCD
LACF
CD
LACFCD
PC LACFCD
LACFCD
LACFCD
LACFCD
PC LACFCD
LACFCD
LACF
CD
Calt
rans
Caltrans
SBOC
Caltrans
Calt
rans
Caltrans
Caltrans
Calt
rans
Designation
or Pu
rpos
e
storm
drai
n
stor
m drain
stor
m drain
stor
m dr
ain
foundation
storm
drain
storm
drai
n
stor
m drain
stor
m dr
ain
foundation
stor
m dr
ain
stor
m dr
ain
storm
drai
n
foundation
foundation
Park
1
foundation
foun
dati
on
foun
dati
on
foundation
foundation
Elev
. (f
eet)
344+
395+
418+
456+
570
458+
478+
370+
536
472
479
455
503
368
369
425
354
356
354
346
350
Tota
l Depth
(fee
t)
18 22 7 13 101
22 26 21 11 22 15 17 13 44 45 2300
13 30 50 36 23
2/
Geology-'
(depths
in f
eet)
0-18:
bedrock
0-22:
Qalo
0-7: be
droc
k
0-13
: bedrock
0-6: Qa
lo
6-101: be
droc
k
0-2:
Qa
lo
2-22:
bedrock
0-26
: Qalo
0-21
: Qalo
0-5:
af
5-11:
Qal
0-4:
af
4-
10:
Qal/Qalo
10-2
2: be
droc
k
0-15
: af
0-6: af
6-17:
Qal
0-13:
af
0-43:
Qal
43-4
4: bedrock
0-41 :
Qal
41-45: bedrock
0-600: no
lo
g 60
0-23
00:
bedrock
0-10
; Qal
10-13: be
droc
k
0-14:
Qal
14-30: bedrock
0-27:
Qal
27-5
0: bedrock
0-33
: Qal
33-36: bedrock
0-11:
Qal
11-2
3: bedrock
Bedrock
sand
ston
e &
siltstone
sandstone
sandstone
sand
ston
e &
shale
sandstone
& siltstone
sandstone
sandstone
sand
ston
e
sand
ston
e
sand
ston
e,
silt
ston
e &
shal
e
sandstone,
siltston
e &
shal
e
sand
ston
e
sand
ston
e &
shale
Rema
rks
(dep
ths
in fe
et)
7: Wa
ter
enco
unte
red,
4/
23/6
J.
Bori
ng terminated d
ue t
o hardness o
f ,
sand
ston
e.
Sandstone
and
shale
interbedded
with
a!1
average
dip
and
strike o
f 41°-S35°W.
Sandstone
and
silt
ston
e weathered-
12:
Wate
r en
coun
tere
d, 4/23/68.
9: Water
enco
unte
red,
4/
23/6
8.
9:
Wate
r en
coun
tere
d, 4/23/68.
Sandstone
with s
hale l
enses.
16:
Water
enco
unte
red,
4/
4/72
.
Sandstone
very d
ense.
37-41: Qal
dense.
16:
Grou
nd w
ater s
urfa
ce,
6/17/58.
Sand
ston
e very d
ense.
0-4:
Some c
obbles.
Inte
rbed
ded
sand
ston
e, si
ltst
one,
an
d sh
ale.
Inte
rbed
ded
sand
ston
e, siltstone, an
d shale.
Bedrock
'.vi
th o
dor
of H
2S.
Sandstone
very d
ense
- 30:
Caving.
Map
No.
2763 A
2760 B
2760 C
2760
F
2760 G
2761 A
2771 A
2771 C
2771 G
2771 H
2771
I
2771
J
2771
S
2781 A
2781
D
3903 M
3903 N
Oper
ator
-/
Pacific
Fruit
Express
Co.
DWP
DWP
Ice
plant
DWP
Calt
rans
Calt
rans
DWP
DWP
DWP
DWP DWP
DWP
DWP
DWP
DWP
DWP
Designation
or P
urpose
foundation
water
water
foun
dati
on
water
foundation
foundation
wate
r
water
water
water
water
wate
r
water
wate
r
water
water
Elev.
(fee
t)
330
333-
328
328
335
337
325
325
300^
345-
353+
315+
355-
363-
367
470-
486
Tota
lD»
epth
(feet)
121
108
68 121
164
60 70 112
85 66 114 89 82 62 84 606
619
2/
Geology
(depths
in f
eet)
0-106: Qal
106-121
: bedrock
0-108: Qal/Qalo
0-68
: Qal/Qalo
0-105: Qal/Qalo
105-121: bedrock
0-130: Qal/Qalo
130-164; bedrock
0-60:
Qal/Qalo
0-64:
Qal/Qalo
64-70: be
droc
k
0-10
3: Qal/Qalo
103-112: be
droc
k
0-82:
Qal/Qalo
82-85:
bedrock
0-66
: Qal/Qalo
0-81:
Qal/Qalo
51-114:
bedrock
0-86
: Qal/Qalo
86-89: bedrock
0-66:
Qal/
Qalo
66-82: bedrock
0-50
: Qal/Qalo
50-62: bedrock
0-38:
Qal/Qalo
38-84: bedrock
0-60
6: Qal/Qalo
0-619
Qal/Qalo
Bedrock
Remarks
Type
(depths
in f
eet)
sand
ston
e &
Sandstone
with
shale
at base.
shal
e
80-108:
Boul
ders
.
20:
Grou
nd w
ater
, 19
74.
shale
85-105:
Some
cobbles to
5 inches.
sand
ston
e &
]0-4
0, 85-102,
120-130: Bo
ulde
rs.
shal
e 10
° dip
in b
edro
ck.
32:
Grou
nd w
ater s
urfa
ce,
3/25
/58.
shale
Shale
very
den
se.
43:
Grou
nd w
ater e
ncou
nter
ed, 12
/31/
57
shale
36-59: Bo
ulde
rs.
? Sandstone
& 12-16: Bo
ulde
rs.
siltstone
sandstone
40-52: Boulders.
? 18-54: Boulders.
"Sof
t shale
sand
ston
e."
shal
e 4-
40:
Boul
ders
.
Sha1e
& Shale
and
sand
ston
e in
terb
edde
d sandstone
39-256:
Boul
ders
.10
3: wat
er e
ncou
nter
ed,
7/1/53.
549-
592:
Sulfur.
Map
No.
3904
A
3908 A
3913 A
3913 B
3913 C
3913
F
3913
H
3914
A
3914
B
3914 C
3914 D
3914 E
3914 F
3914 H
3914
J
3914
K
3914 L
3914
M
3914 N
3914
P
3914 Q
Operator^
DWP
LACFCD
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
Caltrans
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
Calt
rans
DWP
Desi
gnat
ion
or P
urpose
wate
r
stor
m drain
water
wate
r
wate
r
water
water
water
wate
r
water
foundation
wate
r
water
wate
r
water
wate
r
water
water
water
foundation
water
Elev
. (f
eet)
464^
702
470-
470-
470
465-
479
460
465-
465-
456
436
444
440
442
448
456
458
405-
458
460
Total
Depth
(fee
t)
431
10 500
597
499
504
551
436
606
534
60 276
362
320
380
296
338
357 504
80
294
Geology-'
(depths
in f
eet)
0-431: Qa
l/Qa
lo
0-10
: Qalo
0-50
0: Qa
lo
0-59
7: Qalo
0-49
9: Qalo
0-49
5: Qa
l/Qa
lo
495-504: be
droc
k
0-57
1: Qa
l/Qa
lo
0-42
0: Qa
l/Qa
lo
420-
436:
be
droc
k
0-606: Qa
l/Qa
lo
0-53
4: Qa
l/Qa
lo
0-60:
Qal/
Qalo
0-27
3: Qa
l/Qa
lo
273-
276:
! e
drock
0-35
9: Qa
l/Qa
lo
359-362: be
droc
k
0-31
2: Qa
l/Qa
lo
312-320: be
droc
k
0-37
7: Qa
l/Qa
lo
377-380: be
droc
k
0-29
0: Qa
l/Qa
lo
290-296: be
droc
k
0-33
2: Qa
l/Qa
lo
332-338: b
edro
ck
0-35
7: Qa
l/Qa
lo
0-50
4: Qa
l/Qa
lo
0-80:
Qal/
Qalo
0-29
1: Qa
l/Qa
lo
291-294: be
droc
k
Bedr
ock
cong
lome
rate
conglomerate
gran
ite
gran
ite
gran
ite
gran
ite
gran
ite
gran
ite
gran
ite
Rema
rks
(dep
ths
in feet)
82-1
25,
224-246, 310-320: Bo
ulde
rs,
44:
Wate
r en
coun
tere
d, 11/13/31.
No wa
ter.
90-1
05:
Ceme
nted
gra
vel.
5-30
6: Bo
ulde
rs.
42-1
27,
204-241, 308-362: Boulders.
hLS
odor
in bedrock.
Conglomerate w
eathered.
31-6
1, 104-131, 224-230: Bo
ulde
rs.
40-4
02:
Boulders.
Gran
ite
deco
mpos
ed.
Gran
ite
decomposed.
Gran
ite
deco
mpos
ed.
Gran
ite
decomposed.
Gran
ite
deco
mpos
ed.
Gran
ite
decomposed.
220-236, 295-328: Bo
ulde
rs.
202-230: S
ome
boulders.
123-306: Bo
ulde
rs.
47-8
0: Co
bble
s an
d scattered
boul
ders
.
Map
No.
3914
S
3914
T
3915
A
3915
B
3918
A
3918 B
3919
B
3919
C
Oper
ator
-'
DWP
DWP
DWP
PC WSP
139
LACF
CD
LACFCD
LACF
CD
Desi
gnat
ion
or Pu
rpos
e
water
water
water
foundation
well #222
stor
m drain
storm
drain
stor
m dr
ain
Elev.
(fee
t)
445^
465-
402
481
555t
642
473
442
Total
Depth
(feet)
330
313
151
16 48 16 12 20
Geology-/
(depths
in fe
et)
0-330: Qal/Qalo
0-29
4: Qa
l/Qa
lo
0-13
3: Qa
l/Qa
lo13
3-15
1: be
droc
k
0-7:
af
7-10:
Qalo
10-16: be
droc
k
0-48
: Qalo
0-16:
Qalo
0-7: Qa
lo7-12:
bedr
ock
0-10
: Qa
lo10-20: be
droc
k
Bedr
ock
gran
ite
cong
lome
rate
&sa
ndst
one?
gran
ite
siltstone
siltston
e
Remarks
(depths
in fe
et)
198-
217:
Bo
ulde
rs.
275-293: So
me b
ould
ers.
17-1
25,
203-225, 290-294:
Boulders.
22-7
3: Bo
ulde
rs.
133-151: "H
ill
Form
atio
n."
Gran
ite
decomposed.
Silt
ston
e wi
th thin in
terb
eds
of sa
ndst
one.
0-7: Qa
lo (gypsum).
Silt
ston
e interbedded
with
sandstone.
3919
D
LACF
CDstorm
drain
431
120-
12:
bedr
ock
silt
ston
e
3924
A
3924
B
3924 C
3924 E
3924 F
3924
H
3924
J
3924 K
3924
L
3924 M
3924 N
3924 P
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
water
water
water
water
water
wate
r
water
wate
r
water
water
wate
r
water
439
435
437
441
440-
462"
^
435
430-
430-
429
400-
445
308
335
371
182
177
200
192
209
239
257
424
296
0-30
5: Qa
l/Qa
lo
305-
308:
be
droc
k
0-33
4: Qa
l/Qa
lo
334-
335:
be
droc
k
0-37
0: Qa
l/Qa
lo
370-
371:
bedrock?
0-18
0: Qa
l/Qa
lo
180-
182:
be
droc
k
0-17
5: Qa
l/Qa
lo
175-
177:
be
droc
k
0-20
0: Qa
lo
0-18
6: Qa
l/Qa
lo
186-
192:
be
droc
k
0-20
6: Qa
l/Qa
lo
206-209: be
droc
k
0-23
6: Qa
l/Qa
lo
236-239: be
droc
k
0-25
5: Qa
l/Qa
lo
255-
257:
be
droc
k
0-42
4: Qa
l/Qa
lo
0-25
5: Qa
l/Qa
lo
255-
296:
be
droc
k
gran
ite
gran
ite
gran
ite?
gran
ite
gram
' te
gran
ite
gran
ite
gran
ite
gran
ite
granite
10:
Water
enco
unte
red,
6/28/72.
7-12
: Si
ltst
one
with inter-
bedd
ed s
ands
tone
, hi
ghly
we
athe
red.
Gran
ite
decomposed.
Granite
decomposed.
"Gravel
decomposed."
Gran
ite
deco
mpos
ed.
12-108:
Some
bou
lder
s.
Granite
deco
mpos
ed.
Gran
ite
decomposed.
Gran
ite
deco
mpos
ed.
Gran
ite
deco
mpos
ed.
Gran
ite
decomposed.
20-310:
"Som
e rocks."
199-
223:
So
me b
ould
ers.
Granite
hard.
Map
No.
3924 Q
3924
P.
3924 T
3925
A
3925
B
3925 C
3925 D
3925 E
3925
H
3925 J
3925 K
3925
L
3925 M
3925 N
3925
R
3925 S
3925
T
3925
U
3925 W
3926 A
3926 B
Operator-'
Desi
gnat
ion
or P
urpo
se
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
water
wate
r
wate
r
water
wate
r
water
wate
r
water
water
wate
r
water
wate
r
water
water
water
water
wate
r
water
water
water
wate
r
Elev.
(fee
t)
440
460-
440-
429
429
425-
429
430
430-
430
425t
420-
421±
422-
424^
425
426
427
425
409
412
Total
Dept
h(f
eet)
335
400 ?
128
93 130
134
153
172
195
241
143
155
101
86 85 75 81 101
182
173
2/
Geol
ogy
-(d
epth
s in fe
et)
0-28
2: Qa
l/Qa
lo28
2-33
5: bedrock?
0-40
0: Qa
l/Qa
lo
0-192: Qa
l/Qa
lo192-?
bedr
ock
0-11
8: Qa
l/Qa
lo11
3-12
8: be
droc
k
0-84:
Qal/
Qalo
84-9
3: be
droc
k
0-12
4: Qa
l/Qa
lo124-130: be
droc
k
0-13
0: Qa
l/Qa
lo13
0-13
4: be
droc
k
0-14
3: Qa
l/Qa
lo14
3-15
3: be
droc
k
0-17
2: Qa
l/Qa
lo
0-18
1: Qa
l/Qa
lo18
1-19
5: be
droc
k
0-22
9: Qa
l/Qa
lo229-241: be
droc
k
0-14
0: Qa
l/Qa
lo14
0-14
3: be
droc
k
0-14
9: Qa
l/Qa
lo14
9-15
5: be
droc
k
0-10
1: Qa
l/Qa
lo
0-86:
Qal/
Qalo
0-76
: Qa
l/Qa
lo76
-85:
be
droc
k
0-57
: Qa
l/Qa
lo57
-75:
be
droc
k
0-54:
Qal/
Qalo
54-60: be
droc
k
0-83
: Qa
l/Qa
lo33
-101
: be
droc
k
0-18
2: Qa
l/Qa
lo18
2*:
bedr
ock
0-17
3: Qa
l/Qa
lo
Bedr
ock
Type
gran
ite?
granite
gran
ite
gran
ite
granite
granite
shal
e
Rema
rks
(dep
ths
in f
eet)
Gran
ite
deco
mpos
ed w
ith
and
shal
e at b
ase.
"
Gran
ite
deco
mpos
ed.
Granite
decomposed.
Granite
deco
mpos
ed.
Gran
ite
decomposed.
Bedrock
hard
er a
t base.
Gran
ite
decomposed.
"san
d
42-62, 82-94, 158-166: Boulders.
gran
ite
granite
Gran
ite
decomposed.
26-5
6, 65
-123
, 137-141,
Boulders.
Gran
ite
decomposed.
154-181:
104-110, 156-181, 197-219:
gran
ite
gran
ite
granite
granite
shale?
Boulders.
Gran
ite
decomposed.
Gran
ite
decomposed.
0-15:
Some
bou
lder
s.
Granite
decomposed.
Gran
ite
decomposed.
54-60: "S
hale
."60
-78:
"D
ecom
pose
d gr
anit
e."
gran
ite
shal
e
78-8
1: "Shale."
Granite
decomposed.
30-4
3: Bo
ulde
rs.
48-1
01:
Some
boulders.
110-182: Bo
ulde
rs.
30-4
9: Cobbles.
122-
173:
Boulders.
Map
No.
3926
C
3926
P
3926
R
3926
S
3926
T
3926
U
3926
V
3926
W
3927 A
3927
B
3927
C
3927
D
3927
E
3927 F
3927 G
3927
H
3929
A
3929
B
3934 A
3Q34
B
3935
A
Oper
ator
-'
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
Caltrans
Caltrans
Caltrans
Caltrans
Caltrans
Caltrans
Caltrans
Wm. Su
lliv
an
PC DWP
nwp
Caltrans
Designation
or Pu
rpos
e
water
water
water
water
water
water
water
water
water
foundation
foundation
foun
dati
on
foundation
foundation
foun
dati
on
foundation
Well #1
foundation
water
water
foundation
Elev.
(fee
t)
405
406-
407-
409-
41 4l
415-
414-
4131
408-
394
395
394
400
401
401
396
418+
475
520-
R2fl
-
464
Total
Depth
(feet)
169
101
141
150
180
170
197
170
40 29 32 29 38 26 27 32 2410
30 284
3RR
49
Geol
ogy-
' (d
epth
s in feet)
0-16
8: Qa
l/Qa
lo
0-90:
Qal/
Qalo
90-101 :
bedr
ock
0-14
0: Qa
l/Qa
lo
140-
141:
be
droc
k
0-14
8: Qa
l/Qa
lo
148-
150:
be
droc
k
0-18
0: Qa
l/Qa
lo
0-17
0: Qa
l/Qa
lo
0-19
7: Qa
l/Qa
lo
0-17
0: Qa
l/Qa
lo
0-40
: Qa
l/Qa
lo
0-27
: Qa
l/Qa
lo
27-29: be
droc
k
0-32:
Qal/
Qalo
0-27:
Qal/
Qalo
27
-29:
be
droc
k
0-27
: Qa
l/Qa
lo
27-28: be
droc
k
0-19
: Qa
l/Qa
lo
19-2
6: be
droc
k
0-15
: Qa
l/Qa
lo
15-27: be
droc
k
0-31
: Qa
l/Qa
lo
31-3
2: be
droc
k
0-15
7: Qa
lo
157: be
droc
k?
0-22:
Qalo
22
-30:
be
droc
k
0-284: Qalo
0-34
5: (lain
365-
385:
' be
droc
k
0-48:
Qalo
48
-49:
be
droc
k
Bedr
ock
shal
e
shal
e
shal
e
gran
ite
shale
shal
e &
silt
ston
e
shale
shal
e &
silt
ston
e
shal
e
? siltstone
sand
ston
e
gran
i te
Rema
rks
(dep
ths
in fe
et)
28-5
3: Cobbles.
138-168: Boulders.
0-90:
Ceme
nted
gra
vel
.
0-30
: Ce
ment
ed gr
avel
. 60
-90:
Ce
ment
ed s
and.
0-30
: Ce
ment
ed gr
avel
.
144-186: Ce
ment
ed g
rave
l.
0-30
: Ce
ment
ed g
rave
l.
54-9
0: Ce
ment
ed sa
nd.
110-120: Ce
ment
ed g
rave
l.
120-
170:
Ce
ment
ed bo
ulde
rs.
Gran
ite
deco
mpos
ed.
Shal
e ve
ry ha
rd.
Shal
e hard.
0-4:
Some cobbles.
Shal
e &
silt
ston
e siliceous.
13-15: Some cobbles.
Shal
e ve
ry h
ard.
Silt
ston
e jointed.
281-284: Gr
avel
cemented.
345-365: Fault
zone,
gouge
& br
ecci
a wi
th sh
eare
d sa
nds
& clays.
Sand
ston
e "Topanga Fm
."
Gran
ite
decomposed.
No w
ater
.
Map. No
.
3935
B
3935
C
3936 A
3936
B
3937
A
3937
G
3938 A
3938
B
3938 C
3938 D
3938
E
3938 F
3938 G
3944 A
3945
A
3945
B
3946 A
3947
A
3947
B
3947 C
3947 D
Oper
ator
-'
Caltrans
DWP
So.
Calif.
Gas
Co.
DWP
Caltrans
DWP
Calt
rans
DWP
Caltrans
Caltrans
Caltrans
Caltrans
Caltrans
DWP
DWP
DWP
LACF
CD
DWP
DWP
DWP
DWP
Designation
or Pu
rpos
e
foundation
wate
r
water
wate
r
foundation
water
foun
dati
on
water
foun
dati
on
foun
dati
on
foun
dati
on
foundation
foun
dati
on
water
water
water
storm
drain
water
wate
r
wate
r
water
Elev
. (f
eet)
463
A -70+
473-
431
450-
400 420
393
380-
391
383
384
401
401
542
540-
538-
483
439+
438+
435-
438-
Total
Depth
(fee
t)
44 275
330
150
30
143
30 46 60 35 43 29 30 428
200
362
40 180
162
176
160
2/
Geol
ogy-
( depths
in f
eet)
0-37
: Qalo
37-4
3: be
droc
k?
0-27
5: Qa
lo
0-33
0: Qa
lo
0-150: Qalo
0-19
: Qa
lo19-30: be
droc
k
0-12
8: Qalo
128-143: be
droc
k
0-18:
Qal/
Qalo
18-30: be
droc
k
0-32:
Qal/
Qalo
32-4
6: be
droc
k
0-51:
Qal/
Qalo
51-6
0: be
droc
k
0-33:
Qal/
Qalo
33
-35:
be
droc
k
0-40:
Qal/
Qalo
40
-43:
be
droc
k
0-27:
Qal/
Qalo
27-29: be
droc
k
0-29:
Qal/
Qalo
29-3
0: be
droc
k
0-42
8: Qalo
0-20
0: Qa
lo
0-34
5: Qalo
345-
362:
be
droc
k
0-33
: Qa
lo33
-40:
be
droc
k?
0-17
9: Qalo
179-180: be
droc
k
0-16
0: Qa
loIS
O-15
2: be
droc
k
0-16
8: Qa
lo16
8-17
6: be
droc
k
0-152: Qalo
152-160: be
droc
k
Bedr
ock
gran
ite
shale
shal
e
sand
ston
e
shale
shal
e
silt
ston
e
siltstone
shal
e
shale
conglomerate
shale
shal
e &
sand
ston
e
gran
ite
sand
ston
e &
shale
granite
Rema
rks
(depths
in f
eet
Granite
deco
mpos
ed w
ith
sand
.43
-44:
"Very
dens
e sand."
No w
ater.
28-5
0: "Rocks."
114-128, 140-152: Boulders.
152-196: Some co
bble
s.30
-90,
15
0-19
5: Boulders.
265-
292:
Some boulders.
2-11 :
Some co
bble
s.
9-34
: Co
bble
s to
4
inch
es.
32-3
6: Li
mest
one.
36-46: Shale.
30:
Ground w
ater
surface,
9/22
/58.
42-5
1: Cobbles.
33-35: Siltstone
dense.
20:
Ground w
ater surface,
2/25/55.
40-4
3: Si
ltst
one
dens
e.
20:
Ground w
ater
surface,
2/24/55.
27-2
9: Shale
very
hard.
29-3
0: Shale ve
ry ha
rd.
14-51
: Some boulders.
181-197: Gravel ce
ment
ed.
33-4
0: "Shale a
nd sandy
loam
."
Shale
and
sand
ston
e in
ter-
bedded .
152-160: Gr
anit
e de
comp
osed
and
hard a
t base.
Map
No.
3947 E
3947
F
3947 H
3947
J
3948 A
3948
B
3948 C
3948 D
3948 H
3949
A
3949
B
3949
C
3949
D
3949
E
3949
F
3953
A
3953
B
3954
A
3954
B
Oper
ator
-'
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP DW
P
DWP
DWP
DWP
Caltrans
Calt
rans
PC LACFCD
LACFCD
DWP
Caltrans
Designation
or Pu
rpos
e
wate
r
water
water
water
water
wate
r
water
water
water
water
water
water
foundation
foundation
foundation
storm
drai
n
storm
drai
n
water
foundation
Elev
. (feet)
441-
442-
430-
439^
406
395^
361
416
373t
343t
340-
345t
381
367
425-
715
759
602-
619
Total
Depth
(fee
t)
150
173
241
463
260
360
256
217
128
190
205
137
52 50 57 13 13 534
50
Geol
ogy
(d
epth
s in feet)
0-14
2: Qalo
142-
150:
be
droc
k
0-16
7: Qalo
167-
178:
be
droc
k
0-22
8: Qa
lo
228-
241:
be
droc
k
0-18
8: Qalo
188-
463:
be
droc
k
0-22
5: Qa
lo
225-
260:
be
droc
k
0-28
0: Qalo
280-
350:
be
droc
k
0-23
8: Qa
l/Qa
lo
238-
256:
be
droc
k
0-17
0: Qalo
170-
217:
be
droc
k
0-12
8: Qa
l/Qa
lo
0-18
6: Qa
l/Qa
lo
186-
190:
be
droc
k
0-20
5: Qa
l/Qa
lo
205+
: be
droc
k
0-13
1: Qa
l/Qa
lo
131-
137:
be
droc
k
0-52
: Qa
l/Qa
lo
0-45:
Qal/
Qalo
45
-50:
be
droc
k
0-13
: af
13-51: Qa
lo
51-57: be
droc
k
0-13:
Qalo
0-3:
Qalo
3-13:
bedr
ock
0-53
4: Qalo
0-25:
Qalo
25-50: be
droc
k
Bedr
ock
gran
ite
gran
ite
shale
shale
sandstone,
silt
ston
e, &
shal
e
sand
ston
e, si
ltst
one,
and
shal
e
shal
e
sand
ston
e an
d shale
shale
shale
sand
ston
e &
shal
e
sand
ston
e
sand
ston
e
gran
ite
gran
ite
Rema
rks
(dep
ths
in fe
et)
142-
150:
Gr
anit
e de
comp
osed
.
167-176: "Shale &
rotten
gran
ite.
"
228-241: Sh
ale
hard
. 30-33, 194-202: Boulders.
188-463: Sh
ale
very
hard.
164-225: Some c
obbl
es a
nd
boul
der
s .
257:
In
terb
edde
d sa
ndst
one,
siltstone, sh
ale,
numerous
faul
ts,
fractures, go
uge.
338,
34
5: "Fault g
ouge,
with
bedr
ock
frag
ment
s" .
21-2
38:
Boul
ders
to
14 in
ches
170-217: Ab
unda
nt fractures
and
mino
r fa
ults
. 183: Bi
tumi
nous
remains.
153-170: So
me c
obbles.
75-1
05:
Some bo
ulde
rs.
No w
ater.
Sand
ston
e ve
ry d
ense
.
No ca
ving
. 12:
Water
seepage, 10
/26/
70.
Gran
ite
deco
mpos
ed.
258-286: Some bo
ulde
rs.
Gran
ite
deco
mpos
ed.
No w
ater.
Map
No.
3954
D
3954 E
3958
A
3958 C
3958 G
3958 H
3958
J
3958 K
3959
A
3959
B
3959
C
3959
D
3959
E
3959
F
3959
G
3959
H
3959
J
3963
A
3964
A
3964
B
3964 C
3964 D
Opera tor-
Calt
rans
Calt
rans
DWP
DWP
DWP
DWP
DWP
DWP
DWP
Calt
rans
DWP
DWP
DWP
Calt
rans
Calt
rans
Calt
rans
Calt
rans
Calt
rans
Calt
rans
Calt
rans
Calt
rans
LACF
CD
Desi
gnat
ion
or P
urpo
se
foun
dati
on
foun
dati
on
wate
r
water
water
wate
r
wate
r
water
wate
r
foun
dati
on
water
wate
r
water
foun
dati
on
foundation
foundation
foundation
foundation
foundation
foundation
foundation
storm
drain
Elev.
(feet)
640
638
365?
394-
378-
378-
381-
510-
381-
366
355?
350
362?
363
361
360
369
756
628
621
638
650
Total
Depth
(feet)
25
23 96 202
155
268
239
567
98 51 365
213
245
65 51 35 23 33 57 47 30 36
Geol
ogy-
' (d
epth
s in feet)
0-25
: Qa
lo
0-21
: Qa
lo
21-2
3: be
droc
k
0-96
: Qa
l/Qa
lo
0-20
2: Qalo
0-13
6: Qa
l/Qa
lo
136-
155:
be
droc
k
0-25
7: Qalo
257-268: be
droc
k
0-222: Qa
lo
222-239: be
droc
k
0-17
0: Qalo
170-
567:
be
droc
k
0-98:
Qal/
Qalo
0-51
: Qa
l/Qa
lo
0-21:
af
21-2
09?:
Qa
l/Qa
lo
2097-365:
bedr
ock
0-13
2: Qa
l/Qa
lo
132-
213:
be
droc
k
0-3: af
3-
236:
Qa
l/Qa
lo
236-245: be
droc
k
0-65:
Qal/
Qalo
0-48:
Qal/
Qalo
48
-51:
bedrock?
0-24
: Qa
l/Qa
lo
24-3
5: be
droc
k
0-19:
Qal/
Qalo
19
-23:
be
droc
k
0-33
: Qa
lo
0-57:
Qalo
0-47:
Qalo
0-20
: Qa
lo
20-3
0: be
droc
k
0-5: af
5-
36:
bedr
ock
Bedr
ock
gran
ite
shal
e
shale
& sandstone
shale
shale
shale
shale
& si
ltst
one
shale
? siltstone
sandstone
granite
gran
ite
Remarks
(depths
in fe
et)
21-25: Boulders.
No w
ater
.Gr
anit
e decomposed.
No w
ater.
52:
Wate
r encountered, 4/18/55.
60-240:
Some
boulders.
60:
Wate
r en
coun
tere
d, 7/17/58.
42-222:
Boulders.
60:
Water
enco
unte
red,
5/
13/5
8.
Shale
with
sa
ndst
one
and
cher
t interbeds.
146-
160:
Co
bble
s to 8
inches.
21-209:
Boul
ders
. 20
9-33
0: "C
lay
or shale."
330-
360:
"S
hale
hard."
Bedr
ock
dips
16°-33°.
30:
Water
tabl
e, 7/18/57.
19-236:
Boul
ders
. 56:
Wate
r ta
ble,
10
/10/
57.
Bedrock: "consolidated
sand
and
clay."
24-35: Si
ltst
one
dense.
25:
Ground w
ater s
urfa
ce,
10/2/58.
No w
ater
.
No w
ater,.
15-30: Co
bble
s an
d very d
ense.
No w
ater.
Granite
deco
mpos
ed.
No w
ater.
Granite
badly
decomposed.
Map
No.
3964 E
3964
F
3965
A
3965
B
3968
A
3968
B
3968
C
3969
A
3969
B
3969 C
3974 A
3974
B
3974
C
3974
D
3975
A
3975 B
3975
C
3975
D
3975 E
3975 F
3975 6
3975
H
3975
J
Oper
ator
-
LACF
CD
LACFCD
Caltrans
DWP
Caltrans
PC LACF
CD
LACF
CD
PC LACF
CD
PC PC PC PC Caltrans
Calt
rans
Caltrans
Caltrans
Calt
rans
Calt
rans
Cal trans
PC PC
Designation
or P
urpo
se
stor
m drain
storm
drain
foun
dati
on
water
foundation
foun
dati
on
storm
drai
n
stor
m drain
foundation
stor
m drain
foundation
foundation
foun
dati
on
foun
dati
on
foundation
foundation
foundation
foundation
foun
dati
on
foundation
foundation
foundation
foundation
Elev.
(fee
t)
665
667
628
59 3^
424
402
430
429
406
406
700-
680-
682
678-
740
705
656
658
681
641
643
573
582
Total
Qepth
(fee
t)
17 52 79 20 40 35 22 26 25 25 16 38 35 40 115
81 66 70 51 62 52 55 51
Geol
ogy
' (depths
in f
eet)
0-17
: bedrock
0-6
af6-52:
bedrock
0-79:
Qalo
0-20:
Qalo
0-40:
Qalo
0-2: af
2-35
: Qalo
0-22:
Qalo
0-4
af
4-26:
Qalo
0-2:
af
2-22:
Qalo
22-2
5: bedrock
0-2: af
2-22:
Qalo
22-2
5: bedrock
0-12:
Qalo
12-1
6: be
droc
k
0-10
: Qa
lo10
-38:
bedrock
0-33:
Qalo
33-3
5: bedrock
0-2:
af
2-40:
Qalo
0-115: bedrock
0-5:
Qalo
5-81 :
bedrock
0-66:
Qalo
0-70
: Qalo
0-51:
Qalo
0-62:
Qalo
0-52:
Qalo
0-55:
Qalo
0-37:
Qalo
37-51: b
edro
ck
Bedrock
granite
gran
ite
sand
ston
e
sandston
e
granite
gran
ite
gran
ite
granite
granite
granite
Remarks
(dep
ths
in f
eet)
0-17:
Granite
badl
y de
comp
osed
. 15:
Fracture z
ones s
erpentinized?
Gran
ite
badly
decomposed.
No w
ater.
0-5:
Some c
obbles t
o 4
inch
es.
No w
ater.
26:
Wate
r level, 3/
14/6
6.
No c
aving.
6: Wa
ter
enco
unte
red,
1/11/67.
No c
aving.
4: Water
enco
unte
red,
1/11/67.
No c
aving.
4: Water
enco
unte
red,
1/
11/6
7.Sa
me l
og f
iled
for 3
969
B &
C.
12-1
6: Granite
decomposed.
10-3
8: Gr
anit
e decomposed.
No c
avin
g.2:
Water
seeo
aqe,
11/18/68.
33-35: Gr
anit
e de
comp
osed
.
39:
Water
level, 11
/2/6
6.
0-115: Gr
anit
e de
comp
osed
.No
water.
5-81:
Granite
mode
rate
lydecomposed.
No w
ater.
No w
ater.
No w
ater
Dens
e at b
ase
of Q
alo.
No w
ater.
No w
ater.
Very
den
se a
t ba
se o
f Qalo.
No w
ater.
No c
aving.
34:
Sliq
ht wat
er s
eepa
ge,
8/18/7CU
37-51: Gr
anit
e de
comp
osed
.21:
Wate
r se
epag
e, 8
/19/
70.
Map
No.
3977
B
3977
C
3977
D
3977 E
3977
F
3977 6
3977
H
3977
I
3977
J
3977
K
3978 B
3978 C
3979
A
3979
B
3979
C
3979 D
3979
E
3979
F
3979
G
Operator-'
LACF
CD
LACF
CD
LACF
CD
LACF
CD
LACFCD
PC PC DWP
Calw
in O
il
Co.
LACFCD
LACF
CD
LACF
CD
LACF
CD
LACF
CD
LACFCD
LACFCD
LACFCD
LACFCD
LACFCD
Designation
or p
urpo
se
storm
drain
stor
m drain
storm
drain
storm
drai
n
storm
drai
n
foundation
foundation
water
Well #1
stor
m drain
stor
m dr
ain
stor
m dr
ain
stor
m dr
ain
stor
m drain
storm
drain
storm
drain
stor
m dr
ain
storm
drain
storm
drain
Elev
. (f
eet)
481
474
461
465
452
460
453
48ot
480^
440
579
560
534
510
589
508
495
466
448
Tota
l Depth
(fee
t)
26 27 36 20 29 26 21 70 6138
19 17 20
20
22
8 14 19 25 25
21
Geol
ogy
-(d
epth
s in
feet)
0-26
: Qa
lo
0-27
: Qa
lo
0-29
: Qalo
29-36: be
droc
k
0-9:
af
9-20:
Qalo
0-15:
Qalo
15-29: be
droc
k
0-7:
Qalo
7-26:
bedr
ock
0-21:
Qalo
0-45
: Qa
lo
45-7
0+: be
droc
k?
0-40:
Qalo
40-6138: be
droc
k
0-2: af
2-5: Qa
lo
5-19:
bedr
ock
0-2: af
2-17:
bedr
ock
0-7: af
7-
16:
Qalo
16-20: be
droc
k
0-17
: Qalo
17-2
0: be
droc
k
0-22:
Qalo
0-8: be
droc
k
0-2: Qa
lo
2-14
: be
droc
k
0-7: af
7-18
: Qa
lo
18-1
9: be
droc
k
0-25
: Qalo
0-25:
Qalo
Bedr
ock
Type
sandstone
& si
ltst
one
shale
& sandst
one
shale
conglomerate &
shale
shale, sandstone,
& conglomerate
shale
& si
ltst
one
shale
& sandstone
shal
e &
sandst
one
sandstone
silt
ston
e &
shal
e
silt
ston
e
sandstone
Remarks
(depths
in f
eet)
19:
Wate
r se
epag
e, 11
/2/7
2.
0-29
: "Putrid" od
or i
n top
half
. 29-36: Siltstone
with inter
- be
dded
sandstone.
Shal
e wi
th s
ands
tone
interbeds.
8: Wa
ter
encountered, 11/1/72.
7-26
: Shale
fractured
and
with
th
in s
ands
tone
beds.
Below
18:
Caving.
18:
Water
seep
age,
2/3/69.
45-70: "C
ongl
omer
ate.
" 70-70+:
Shale.
5-7: Siliceous
shale
with
30°
dip.
7-19
: si
ltst
one
with
minor
sili
ceou
s shale.
2-6: Shale
with s
ands
tone
lenses.
16-20: Shale
with sandstone
inte
rbed
s.
No caving.
11:
Water
seep
age,
1/14/67.
17-20: Sa
ndst
one
with
cla
y lenses.
9: Water
encountered, 1/12/67
11:
Wate
r seepage, 1/14/67.
Below
11 :
Sloughing.
0-8: Siltstone
and
shale
laminated.
2-14:
Silt
ston
e with m
inor
sandstone
lenses.
16:
Wate
r se
epag
e, 1/12/67.
13:
Water
encountered, 1/12/67.
Map
No.
3986
A
3986
B
3986
C
3986
E
3987
A
3987
B
3987
C
3987
D
3987
F
Operator-'
DWP
DWP
DWP
DWP
DWP
DWP
DWP
LACFCD
DWP
Designation
or P
urpo
se
wate
r
wate
r
wate
r
water
water
water
wate
r
stor
m drain
wate
r
Elev
. (f
eet)
528-
530-
582-
528-
480-
480-
482-
486
483-
Total
depth
(feet) 91 151
144
102
214
214
253
34 278
Geol ogy-
Bedr
ock
(dep
ths
in fe
et)
Type
0-85:
Qalo
gr
anit
e 85
-91:
be
droc
k
0-15
0:
Qalo
? 15
0-15
1: be
droc
k
0-14
4: Qalo
0-96
: Qalo
gran
ite
96-1
02:
bedr
ock
0-74:
Qalo
shal
e 74
-214
: be
droc
k?
0-74:
Qalo
shale
74-2
14:
bedr
ock?
0-16
4: Qalo
gran
ite
164-
205:
bedrock?
0-34
: Qa
lo
0-27
8: Qalo
Rema
rks
(dep
ths
in fe
et)
85-9
1: Gr
anit
e "rotten."
96-1
00:
Gran
ite
deco
mpos
ed.
74-1
70:
"Sand
and
shal
e."
170-214: Ha
rd sh
ale.
74-1
70:
"San
d and
shal
e."
170-214: Ha
rd sh
ale.
Same lo
g fi
led
for
3987 A
& B.
164-
205:
Gr
anit
e de
comp
osed
. 205-253: "C
emen
ted
sand."
12-18: H?
S od
or
13:
Watef
seepage, 11/3/72.
124-129:
Boulders.
I/ ARCO:
Atla
ntic
Ric
hfie
ld C
ompa
nyBOGCO: Burmak O
il and
Gas
Comp
any
Caltrans:
California Department of Transportation
CE:
U.S. Ar
my C
orps of E
ngineers
DWP:
Los
Ange
les
City De
part
ment
Water a
nd P
ower
DWR:
California D
epartment
Wate
r Resources
Hosp:
Hosp
ital
LACF
CD:
Los
Ange
les
Coun
ty Flood
Cont
rol
Dist
rict
LACIB: Lo
s An
gele
s City public bu
ildi
ngLACOB: Lo
s An
gele
s County public bu
ildi
ngMT
A: Metropolitan T
rans
it A
uthority (of
1962
)NPC: Neaves Petroleum
Comp
any
PC:
Priv
ate
cons
ulta
nt or co
ntra
ctor
SBOC:
Seab
oard
Oil
Co
mpan
ySOCAL: St
anda
rd O
il Co
mpan
y of
California
TEXA
CO:
Texa
co,
Inco
rpor
ated
VOCO:
Vent
ura
Oil
Comp
any
WS:
Will
iam
Sull
ivan
WSP
139:
U.S. Geological Su
rvey
Water S
uppl
y Paper
139
/af: Ar
tifi
cial
fi
ll and
coll
uviu
m Qal
: Alluvium
Qalo:
Old
allu
vium
Qsp: San
Pedro
Formation
(Tho
mas
and
othe
rs,
1961)
Tabl
e IB
. We
lls
and
shallow
borings
shown
on s
heet 3
B (South S
heet)
Map
No.
2702 A
2703 A
2703 B
2703 C
2703
D
2703 E
2703
F
2703 G
2703
H
2703 J
2703
K
2703
L
2703 M
Operator-^
PC PC PC PC PC PC PC PC PC PC PC MTA
PC
Desi
gnat
ion
or P
urpose
foun
dati
on
foun
dati
on
foun
dati
on
foun
dati
on
foun
dati
on
foundation
foun
dati
on
foundation
foun
dati
on
foun
dati
on
foun
dati
on
WC-7
5
foun
dati
on
Elev
. (f
eet)
312+
245+
249
242
240
248
246
244+
241
249+
249+
255
250+
Total
Dept
h (f
eet)
20 40 48 26 46 40 50 49 50 55 49 49 49
2/
Geol
ogy-
'(depths
in f
eet)
0-8:
af
8-20:
bedrock
0-16
: af
16
-40:
be
droc
k
0-35:
af
35-4
8: bedrock
0-20:
af
20-2
6: be
droc
k
0-22
: af
22-3
7: Q
alo
37-4
6: bedrock
0-27
: af
27
-40:
bedrock
0-27:
af
27-4
5: Qa
l/Qa
lo
45-5
0: bedrock
0-45:
af
45-4
9: Qa
l/Qa
lo
0-38
: af
38
-47:
Qa
l/Qa
lo
47-5
0: bedrock
0-17
: af
17
-27:
Qa
l/Qa
lo
27-5
5: bedrock
0-26:
Qalo
26-4
9: bedrock
0-35
: Qalo
35-4
9: bedrock
0-29
: Qalo
29-4
9: bedrock
Bedrock
shal
e
shal
e
shal
e
shal
e
shal
e
shale
shal
e
shale
shal
e
shale
siltston
e
shale
Rema
rks
(depths
in f
eet)
1-7: So
me c
emented
lump
s.
No c
aving.
No w
ater.
Shale weathered
and
lami
nate
d.
37-38: Hi
ghly
cem
ente
d la
yer.
No c
aving.
37:
Water
seep
age,
8/14/59.
Shal
e weathered
with
hard
lenses.
38-3
9: Firm l
ayer
. 0-
25:
"Cav
ing
badl
y."
Shale
firm.
No c
aving.
No w
ater.
Shale
weat
here
d.
42-43: Hard l
ayer
. No c
aving.
27:
Slight w
ater
see
page
, 8/12/59
Shal
e we
athe
red.
Above
7: M
oderate
raveling.
29:
Wate
r se
epag
e, 7/16/64.
Shale
weathered
and
bedd
ed.
Water
seepage
pres
ent,
8/3/67.
Patc
hy r
avel
ing
in a
f.
25:
Wate
r se
epag
e, 8/
14/6
3.
Shale
weathered.
No c
aving.
32:
Perc
hed(
?) w
ater
, 2/
24/6
0.
Shal
e hi
ghly
wea
ther
ed,
join
ted,
fractured, an
d bedded.
No c
aving.
30:
Wate
r seepage, 4
/9/6
3.
Shale
high
ly w
eath
ered
, jo
inte
d,
fractured, and
bedded.
24-2
5: Sloughing.
25:
Water
seep
age,
4/9/63.
Bedrock
dips t
o 20°.
10-15: P
erch
ed(?
) wa
ter,
2/20/62.
Shale
stra
tifi
ed a
nd weathered
grad
ing
to u
nwea
ther
ed.
35,42: Hard c
emented
layers.
18-2
2: Caving...no
data a
fter 2
9 fe
et.
19-2
9: Water
seepage, 1/9/59.
Map
No.
2703 N
2704 A
2707 A
2709
A
2711
F
2711 G
Oper
ator
^
PC PC PC PC LACF
CD
LACF
CD
Desi
gnat
ion
or P
urpose
foundation
foundation
foundation
foundation
storm
drain
storm
drain
Elev.
(feet)
245
226
174
162+
295+
297+
Tota
l Depth
(fee
t) 58 26 16 40 32 34
Geology-'
(depths
in f
eet)
0-33
: af
33-54: Qalo
54-5
8: bedrock
0-8: af
8-19:
Qal/
Qalo
19-26: bedrock
0-4: af
4-
16:
Qal/Qalo
0-7: af
7-40:
Qal/
Qalo
0-8: Qa
lo
8-32:
bedrock
0-34:
bedr
ock
Bedrock
shale
shale
shale
& siltston
e
shale
& siltstone
Remarks
(depths
in fe
et)
Shale weathered
and
bedded.
55:
Ceme
nted
layers.
Belo
w 29:
Heav
y sloughing.
29,32: Water
seep
age,
3/3/70.
Shale
weat
here
d an
d bedded.
10-12: Caving.
10:
Water
seepage, 6/28/63.
4-16:
Few
cobbles
to 10 i
nches
Belo
w 6: Ra
veli
ng.
No w
ater
.
9-14
: Caving.
No w
ater
.
0-10
: Shale.
10-3
4: Siltstone.
2711 H
PC
foundation
2711 J
PC
foundation
2712 A
PC
foun
dati
on
2712
B
PC
foundation
2712
C
PC
foundation
2712 D
PC
foundation
2712 E
LA
CFCD
st
orm
drain
2712
F
LACF
CD
storm
drain
2712 G
LA
CFCD
storm
drai
n
294
35
0-2: af
2-19:
Qalo
19
-35:
bedrock
291
16
0-3:
af
3-15:
Qalo
15-16: bedrock
268
45
0-11
: af
11-27: Qa
lo
27-45: bedrock
280+
61
0-57:
af
57-61: bedrock
270+
49
0-
40:
af
40-49: bedrock
270+
52
0-43
: af
43-46: Qalo
46-53: bedrock
310+
35
0-35:
bedrock
280+
29
0-
4: a
f 4-29:
bedrock
269+
27
0-16:
Qalo
16
-27:
bedrock
shale
shale
silt
ston
e
shale
shale
shale
shale
& siltstone
sandstone,
silt
ston
e, &
shale
sandston
e &
siltston
e
Shale
inte
rbed
ded wi
th t
hin
layers
of s
ilts
tone
. 19
-25:
Sha
le h
ighl
y we
athe
red.
No
caving.
23:
Wate
r se
epag
e, 10/22/74.
Shale
weathered
and
fractured.
11-15: Caving.
11:
Water
encountered, 5/
30/7
5.22-45: Pe
trol
eum
odor
. Wa
ter
seep
age
present, 4/6/72.
54:
Patches
of o
il-b
eari
ng s
and.
40-41: "Caving
badly."
40:
Wate
r se
epag
e, i957.
Shal
e sl
ight
ly f
ractured a
nd
thin
ly b
edded,.
No caving.
30-40: Sl
ight
water s
eepa
ge,
8/21
/63.
Shal
e la
mina
ted.
40-43: Sq
ueez
ing-
in.
41:
Wate
r se
epag
e, 4/
28/5
8.
Shale
and
silt
ston
e interbedded.
Sand
ston
e, si
ltst
one,
an
d sh
ale
interbedded.
Sand
ston
e an
d si
ltst
one
inte
rbed
ded.
21-27: Pe
trol
eum
odor
.
Map
No.
2712
H
2712
I
2712
0
2712 K
2712
L
2712 M
2712
N
2712
P
2712 Q
Operator^-'
LACFCD
LACF
CD
LACF
CD
LACFCD
LACFCD
Caltrans
LACFCD
PC PC
Desi
gnat
ion
or Pu
rpos
e
stor
m drain
stor
m dr
ain
storm
drai
n
storm
drai
n
storm
drain
foun
dati
on
storm
drai
n
foundation
foun
dati
on
Elev
. (f
eet)
275+
290+
290+
286+
286+
298
280+
320
340+
Total
Depth
(fee
t)
12 21 56 28 25 36 32 34 50
21
Geology-
(dep
ths
in f
eet)
0-7:
Qalo
7-12:
bedr
ock
0-10
: af
10-21: be
droc
k
0-5: af
5-56:
bedr
ock
0-10
: af
10
-28:
be
droc
k
0-7: af
7-
21 :
bedr
ock
0-12:
af
12-36: Qalo
0-32:
Qalo
0-27:
af
27-3
4: be
droc
k
0-6:
af
6-50
: be
droc
k
Bedr
ock
sand
ston
e
silt
ston
e &
sandst
one
sandst
one
& si
ltst
one
siltstone
shal
e &
silt
ston
e
shal
e
silt
ston
e
Rema
rks
(dep
ths
in f
eet)
15-2
1: Pe
trol
eum
odor
and f
eel.
No ca
ving
. 13:
Wate
r en
coun
tere
d, 1/27/70.
Sand
ston
e and
silt
ston
e inter l
ayered.
17-5
6: Pe
trol
eum.
No c
aving.
11:
Wate
r se
epag
e, 5/5/70.
7-21:
Shal
e.
21-25: Siltstone.
26:
Wate
r en
coun
tere
d, 1/
13/4
9.
Shale
bedded.
No c
aving
or w
ater.
Silt
ston
e we
athe
red,
fractured,
and
bedded, wi
th s
andstone l
ayers, and w
i
2712 R
2712
S
2713 A
LACF
CD
PC PC
storm
drai
n
foun
dati
on
foun
dati
on
289+
30
361+
49
265+
27
0-30:
af
0-6:
af
6-49:
bedr
ock
0-24:
af
24-2
7: be
droc
k
seam
s of
gyp
sum.
41:
Oil
trac
es.
No caving or
wat
er.
silt
ston
e Si
ltst
one
frac
ture
d wi
th la
yers
of s
ands
tone
and
seams
of gy
psum
. 44:
Oil
trac
es.
No ca
ving
or
water.
sand
ston
e Sandstone weathered
and
slig
htly
cemented.
No ca
ving
.
Slight seepage
present, 6/
6/62
.
2713 B
DWP
wate
r
2713 C
DWP
water
2713 D
2713 E
LACF
CD
LACFCD
storm
drai
n
storm
drain
263+
310+
263+
285+
270
500
35 41
0-27
0: Qa
lo
0-50
0: be
droc
k
0-17
: Qa
lo
17-3
5: be
droc
k
0-13:
af
13-41: be
droc
k
240-270: Oi
l.
gran
ite
385-
400:
Oil.
400-425: Oi
l, gas.
silt
ston
e,
17-2
7: Siltstone.
shale, &
27-3
3: Shale wi
th oily texture.
sand
ston
e 33
-35:
Sandstone.
siltstone
& 13
-17:
Siltstone.
shale
17-4
1: Sh
ale.
Map
No.
2713 F
2713 G
2713 H
2713
I
2713 J
2713 K
2713 L
2713
M
2713 N
2713 P
2713 Q
2713
R
2713 S
Oper
ator
De
sign
atio
n or
Pu
rpos
e
LACFCD
stor
m dr
ain
PC
foundation
LACFCD
stor
m dr
ain
PC
foundation
PC
foundation
LACFCD
stor
m drain
LACFCD
stor
m dr
ain
PC
foundation
LACF
CD
storm
drain
LACF
CD
storm
drain
PC
foundation
PC
foundation
PC
foun
dati
on
Tota
l ./
Elev.
Dept
h Geology-'
(feet)
(fee
t)
(dep
ths
in feet)
260+
35
0-18
: Qa
lo
18-35: be
droc
k
264
30
0-6:
af
6-8: Qalo
8-30
: be
droc
k
253+
40
0-4: af
4-21:
Qal/
Qalo
21
-40:
be
droc
k
277
50
0-18
: af
18-35: Qalo
35-5
0: be
droc
k
260
62
0-2: af
2-
7: Qa
lo
7-62:
bedr
ock
254+
30
0-18:
af
18-3
0: be
droc
k
262+
31
0-
9: af
? 9-14:
Qal/
Qalo
14-31: be
droc
k
247+
26
0-
4: Qa
l/Qa
lo
4-26:
bedr
ock
247+
34
0-14
: Qa
l/Qa
lo
14-34: be
droc
k
258+
45
0-3: Qa
lo
3-45:
bedr
ock
280+
50
0-2:
af
2-
17:
Qalo
17-5
0: be
droc
k
256
27
0-9: af
9-
17:
Qalo
17-27: be
droc
k
253
36
0-14:
Qalo
14-36: be
droc
k
Bedr
ock
shale
& si
ltst
one
shal
e
silt
ston
e
shal
e
shal
e
silt
ston
e
sand
ston
e &
siltstone
shale
sand
ston
e &
silt
ston
e
silt
ston
e
shale
shale
shale
Rema
rks
(dep
ths
in f
eet)
18-32: Sh
ale.
32-35: Siltstone.
Shal
e we
athe
red
and
bedd
ed.
No ca
ving
. 22
: Slight w
ater seepage, 1/
28/6
3.
Shal
e highly weathered w
ith
thin
beds of
sa
ndst
one.
Below
20:
Heavy
caving an
d squeezing.
21,2
5: Slight w
ater s
eepage,
3/26/69.
7-32
: Sh
ale
highly weathered and
frac
ture
d wi
th th
in sa
ndst
one
beds.
32-6
2: Sh
ale
less we
athe
red.
2-
7: Some co
bble
s to
8
inch
es.
No ca
ving
. 27:
Water
seepage, 10/11/68.
Sand
ston
e and
siltstone
interbedded.
Shale
weat
here
d.
17:
Shale
highly f
ractured.
No ca
ving
. 16
: Slight w
ater seepage, 7/
5/61
.
14-1
8: Sandstone.
18-34: Si
ltst
one.
3-10
: Ta
r ab
unda
nt.
10-45: Tar
inte
rbed
ded.
Shale
laminated.
2-17
: As
phal
t saturated.
25:
Asphaltic
sand
. 23,44,50:
Oil
seep
age.
No ca
ving
or
wat
er.
Shal
e fractured
with
interbedded
lens
es of siltstone.
9-17
: As
phal
t pr
olif
ic.
20:
Asph
alt
streaks.
No ca
ving
or w
ater
.
Shale
slig
htly
fra
ctur
ed and
jointed,
thin
ly b
edde
d, an
d wi
th sandstone
len
ses.
No
ca
vin
g.
16:
Ver
y slig
ht
wat
er
seep
age,
1/
24/6
4.
lap
No.
2713 T
2713 U
2713 V
2713 W
2713 X
2713 Y
2713 Z
2713 A
A
2713 BB
2713 D
O
2713 EE
2713 F
F
Oper
ator
-7
PC PC PC MTA
PC PC MTA
MTA PC PC PC PC
Desi
gnat
ion
or P
urpose
foundation
foundation
foundation
WC-78
foundation
foundation
WC-76
WC-77
foundation
foundation
foundation
foun
dati
on
Tota
l 21
Elev.
Depth
Geology-
7 (feet)
(fee
t)
(depths
in f
eet)
258
49
0-7:
af
7-
26:
Qalo
26-49: bedrock
261
40
0-33
: Qa
lo
33-40: bedrock
261
60
0-31
: Qa
lo31-60: bedrock
245
42
0-25:
Qal/Qalo
25-42: bedrock
262
50
0-4: af
4-23:
Qalo
23-50: bedrock
262
50
0-3: af
3-30
: Qa
lo30-50: bedrock
258
61
0-28
: Qal/Qalo
28-61: bedrock
260
57
0-30:
Qalo
30-57: bedrock
255
32
0-3:
af
3-27:
Qalo
27-32: bedrock
264
42
0-2: af
2-31
: Qalo
31-42: bedrock
264+
49
0-1:
af
1-27:
Qalo
27-49: bedrock
265+
48
0-1:
af
1-23:
Qalo
23-48: bedrock
Bedr
ock
shal
e
shal
e
shale
siltston
e
shal
e
shal
e
siltston
e
siltston
e
shal
e
shale
shal
e
shal
e
Remarks
(depths
in feet)
Shal
e th
inly
bedded, sl
ight
ly
frac
ture
d and
join
ted.
26-49: Oc
casi
onal
oil
seams.
3-8:
Caving.
No w
ater.
14-1
6, 29:
High
ly c
emen
ted.
16-20: As
phal
tic
sand
sat
urat
ed w
ith
oil.
33-40: Asphaltic
sand
lam
inat
ions
.No
caving.
15:
Slig
ht w
ater
se
epag
e, 2/
13/5
8.
13,
17:
Very
oil
y.19-31: Od
orou
s.
Silt
ston
e bedded.
17:
Wate
r en
coun
tere
d, 3/14/62.
No caving.
29:
Mode
rate
wat
er se
epag
e, 1956.
Shal
e we
athe
red,
fractured, bedded.
35:
Tar
stre
aks.
38-41: Ha
rd c
emented
layer.
Wate
r pr
esen
t, 6/20/71.
Silt
ston
e wi
th 2
0° dip.
50-61: St
rong
H?
S od
or.
14:
Wate
r encountered, 3/
13/6
2.
Silt
ston
e wi
th 2
5° di
p.17-30: Pe
trol
ifer
ous
odor
.30-40: Asphaltic
sand
.Below
15:
Wate
r encountered, 3/13/62.
No caving.
17,
25:
Wate
r se
epag
e, 4/
29/6
7.
Shal
e weathered
and
interbedded
with sandstone.
24-29: Caving. ..no d
ata
after
29 f
eet
24:
Wate
r encountered, 10
/13/
71.
Shal
e laminated.
No caving.
26:
Slig
ht w
ater s
eepa
ge,
1957.
37:
Heavy
water
seep
age,
19
57.
Shal
e laminated.
No caving.
31,
40:
Slig
ht w
ater s
eepa
ge,
1957
.
Map
No.
Operator
2713 6
6 PC
2713 HH
PC
2713 II
PC
2713 J
J PC
2713 KK
PC
2713 LL
PC
2713 M
M PC
2713 NN
PC
2713
PP
PC
2713
PC
2713
RR
PC
2713 SS
PC
2713 T
T PC
Designation
or P
urpose
foun
dati
on
foun
dati
on
foun
dati
on
foun
dati
on
foun
dati
on
foun
dati
on
foundation
foun
dati
on
foun
dati
on
foun
dati
on
foun
dati
on
foun
dati
on
foun
dati
on
Elev
. (f
eet)
266
267
270
272
258
243
248
260
249
244
250
246
263
Tota
l De
pth
(fee
t)
21 32 35 31 65 49 34 39 48 45 49 32 38
6eol
ogy-
/ (d
epth
s in f
eet)
0-2:
af
2-19
: Qalo
19-2
1: bedrock
0-1:
af
1-29:
Qalo
29-3
2: bedrock
0-23:
Qalo
23-3
5: bedrock
0-26:
Qalo
26-3
1: bedrock
0-2:
af
2-27:
Qalo
27-6
5: bedrock
0-15:
af
15-2
7: Q
alo
27-4
9: bedrock
0-1:
af
1-14:
Qalo
14-3
4: bedrock
0-6:
af
6-19:
Qalo
19-3
9: bedrock
0-10:
af
10-31: Qalo
31-48: bedrock
0-4:
af
4-30:
Qalo
30-45: bedrock
0-7:
af
7-20
: Qalo
20-4
9: bedrock
0-8:
af
8-10:
Qalo
10-3
2: be
droc
k
0-23:
Qalo
23-3
8: be
droc
k
Bedrock
shal
e
shal
e
shal
e
shale
shal
e
shal
e
shal
e
shal
e
shal
e
shal
e
shal
e
shal
e
shale
Remarks
(dep
ths
in f
eet)
No c
aving
or w
ater.
Shale
weat
here
d.
23-2
9: He
avy
caving.
25:
Water
seepage, 4/14/59.
Shale
weat
here
d.
21-2
3: M
oder
ate
caving.
28:
Water
seepage, 4/
14/5
9.
Shale
well
-be
dded
. 0-26:
Slig
ht c
aving.
25:
Water
seepage, 1/22/63.
No c
aving.
27:
Wate
r se
epag
e, 5/
28/7
2.
0-16:
Raveling.
27:
Wate
r seepage, 5/
29/7
2.
Shal
e wi
th s
ands
tone
lenses.
4-14:
Slig
ht s
loug
hing
. 4, 14
: Water
seepage, 9/
14/6
6.
Shale
frac
ture
d an
d la
mina
ted.
No c
aving.
26:
Water
seepage, 5/
26/6
5.
Shal
e weathered.
43-48: Hi
ghly
cem
ente
d.
25-3
1 : Ca
ving
. 28
-31:
Water
seepage, 2/
12/6
9.
Shale wi
th s
ands
tone
lenses.
45:
Cemented.
24-3
0: Sloughing.
24:
Water
seep
age,
9/2
5/68
.
Shale
weathered.
49:
High
ly c
emented.
No c
aving.
28:
Slight w
ater s
eepage,
10/25/68,
Shale
with
san
dsto
ne l
enses.
No c
aving
or w
ater.
Shal
e we
athe
red,
jointed, th
ickl
y bedded,
and
with
qyp
sum
lenses.
No c
avin
g.23
, 32:
Slig
ht w
ater
see
page
, 11
/19/
69.
Map
No.
2713 U
U
2713 X
X
2713 YY
2714
A
2714
B
2714
C
2714
D
2714
E
2714
F
2714
G
2715 A
2716 A
2717
A
2718
A
2718 B
2718 C
2718
D
2719
A
2719 B
Oper
ator
PC MTA
PC MTA
LACFCD
PC
LACFCD
MTA
LACF
CD
PC SOCA
L
ARCO
SOCA
L
DWP
PC LACO
B
LACOB
DWP
DWP
Desi
gnat
ion
or Pu
rpos
e
foundation
WC-7
9
foun
dati
on
WC-80
storm
drai
n
foun
dati
on
stor
m drain
WC-81
stor
m dr
ain
foun
dati
on
Roseberry
CH 1
West
Ada
ms C
H 1
Dana C
H 2
wate
r
foun
dati
on
foun
dati
on
foun
dati
on
wate
r
wate
r
Elev
. (f
eet)
244
259
260+
266
257+
244+
271+
278
237+
260+
243+
198+
190+
185+
182+
178+
178+
161+
175+
Tota
l Depth
(fee
t)
41 55 60 67 43 33
41 67 36 50 2200
1900
2100
152
76 26 25 98 60
Geol
ogy-
' (d
epth
s in f
eet)
0-12:
af
12-1
9: Qalo
19-41: be
droc
k
0-22
: Qalo
22-5
5: be
droc
k
0-4:
af
4-35
: Qa
lo
35-60: be
droc
k
0-15:
Qalo
15-67: be
droc
k
0-5: af
5-12:
Qalo
12-43: be
droc
k
0-1:
af
1-11:
Qalo
11-33: be
droc
k
0-3:
af
3-
27:
Qalo
27-41: be
droc
k
0-17:
Qalo
17-67: be
droc
k
0-36
: Qa
l/Qa
lo
0-50
: Qalo
0-15
5: Qalo
155-
2200
: be
droc
k
0-215: Qal/Qalo/Qsp
215-1900:
bedr
ock
0-255: Qa
l/Qa
lo
255-
675:
Qs
p?
675-2100:
bedr
ock
0-15
2: Qa
l/Qa
lo
0-76
: Qa
l/Qa
lo
0-26
: Qa
l/Qa
lo
0-25
: Qa
l/Qa
lo
0-98:
Qal/
Qalo
0-60
: Qa
l/Qa
lo
Bedr
ock
shale
si Its
ton
e
shal
e
siltston
e
siltston
e
shal
e
silt
ston
e &
sandston
e
silt
ston
e
shale,
silt
ston
e, &
other
shale
siltstone
& shale
Rema
rks
(dep
ths
in f
eet)
Shal
e we
athe
red
with
sandstone l
enses,
41 :
Highly c
emented.
No c
aving.
23:
Slight w
ater
see
page
, 10/26/68.
5-45
: Pe
trol
ifer
ous.
No
water.
Shal
e weathered
and
lami
nate
d.
Below
20:
Heavy
caving.
21:
Water
seep
age,
1/
17/6
1.
Silt
ston
e wi
th a
ver
tica
l di
p.
5-7: Tar
satu
rate
d.
0-30:
Shal
e weathered.
30-3
3: Shale
very
firm.
No c
avin
g.
22:
Mode
rate
water s
eepaae.
5/2/60.
Siltsone a
nd s
ands
tone
ihterbedded.
2-18:
Petroleum
odor.
No ca
ving
or
wate
r.
155-
2000
: Sh
ale
and
silt
ston
e.
16-3
6: 5% c
obbles to
8 i
nche
s wi
th
a few
boul
ders
. 7-36,
65-7
6: Caving.
53:
Very s
ligh
t wa
ter
seepage, 1
2/14/64.
15-26: Cobbles
to 8
inc
hes.
16-2
5: So
me c
obbl
es to 8
inc
hes.
Map
No.
2719 C
2721
C
2721
D
2721
E
2721
F
2722 A
2722
B
2722 C
2722 D
2722 E
2722
F
2722
6
2722
H
2722
I
2722 J
2723 A
2723 B
2723 C
2723
D
2723 E
Oper
ator
-^
Caltrans
LACFCD
LACFCD
LACFCD
LACFCD
LACFCD
PC LACFCD
LACFCD
LACFCD
LACFCD
PC PC DWP
PC PC PC LACFCD
LACFCD
PC
Designation
or Pu
rpos
e
foun
dati
on
storm
drain
storm
drain
storm
drain
storm
drain
storm
drain
foun
dati
on
storm
drain
storm
drai
n
storm
drain
storm
drai
n
foun
dati
on
foun
dati
on
wate
r
foun
dati
on
foundation
foundation
storm
drai
n
storm
drai
n
foundation
Elev.
(feet)
159+
334
328+
310+
366
289+
288+
297
324
349
360
302+
361 +
380+
361
313
309
327+
389+
329
Total
Depth
(fee
t) 100
27 34 23 16 14 16 8 15 7 24 20 20 640
30 36 31 24 24 26
Geology-'
(dep
ths
in f
eet)
0-10
0: Qa
l/Qa
lo
0-8: Qalo
8-27 :
bed
rock
0-34
: be
droc
k
0-23
: Qa
lo
0-16:
bedr
ock
0-14:
af
0-12
: af
12
-16:
be
droc
k
0-8:
be
droc
k
0-13
: af
13-15: be
droc
k
0-5: af
5-7:
be
droc
k
0-2:
af
2-24:
bedr
ock
0-18
: af
18-2
0: be
droc
k
0-9: af
9-20:
bedr
ock
0-64
0: be
droc
k
0-3: af
3-30:
bedr
ock
0-15
: af
15-36: be
droc
k
0-31:
af
0-24
: af
0-24
: Qalo
0-16:
af
16-2
6: be
droc
k
Bedr
ock
shal
e
sandstone,
siltstone, &
shal
e
sand
ston
e
shale
sand
ston
e &
silt
ston
e
silt
ston
e
silt
ston
e &
shale
sandstone,
silt
ston
e, &
shale
shale
shale
sand
ston
e or
siltst
one
shal
e
shale
shal
e
Rema
rks
(dep
ths
in feet)
No w
ater
.
Shale
weat
here
d.
12:
Wate
r encountered, 4/29/68.
0-20
: Sandstone
20-2
8: Siltstone
and
shale.
28-34: Sandstone.
Shale
weat
here
d.
No ca
ving
or w
ater
.
Sand
ston
e an
d si
ltst
one
interbedded
Silt
ston
e and
shal
e interbedded.
Sandstone, si
ltst
one,
and
shale
interbedded.
Shal
e we
athe
red.
No
ca
ving
. 15:
Water
seepage, 8/29/63.
Shale
thinly laminated.
No ca
ving
or
wat
er.
* 440-480: Oil.
50:
Wate
r en
coun
tere
d, 19
02.
Shale
with sandy
lenses fractured
and
bedded w
ith
an av
erag
e st
rike
an
d dip
of 9°
, 18
0°.
No ca
ving
or w
ater.
Shal
e we
athe
red.
No
ca
ving
. 19:
Water
enco
unte
red,
9/20/66.
No ca
ving
. 15:
Water
seepage, 1955.
18-2
4: As
phal
tic
material
.
Shal
e jo
inte
d and mo
dera
tely
cemented.
No caving or w
ater.
Map
No.
2723 F
2723 6
2723 H
2723
I
2723 J
2723 K
2723 L
2723 M
2723 N
2723 P
2723 Q
2723 R
2723
S
2723 T
2723 U
Oper
ator
^'
Designation
or P
urpose
LACF
CD
stor
m drain
LACF
CD
storm
drain
LACF
CD
storm
drain
LACF
CD
storm
drain
PC
foundation
LACF
CD
storm
drain
LACF
CD
storm
drain
LACF
CD
storm
drain
PC
foundation
PC
foundation
PC
foundation
PC
foundation
PC
foundation
PC
foun
dati
on
LACOB
foundation
Elev
. (f
eet)
290+
290+
345+
272+
303+
300+
300+
265+
355
352
357
365
408
363
280+
Tota
l De
pth
(fee
t)
19 24 30 26 32 39 26 30 TOO
55 96 65 76 35 21
Geol ogy
-'
(depths
in f
eet)
0-7: af
7-19
: Qalo
0-15:
af15-24: bedrock
0-30
: af
0-15
: Qa
lo15-26: bedrock
0-2: af
2-32
: bedrock
0-26
: af
26-29: Qalo
29-3
9: be
droc
k
0-17
: af
17-26: Qa
lo
0-18
: Qal/Qalo
18-30: bedrock?
0-6: af
6-100: be
droc
k
0-15
: af
15-55: be
droc
k
0-15:
af15-96: bedrock
0-7: af
7-65:
bedrock
0-3: af
3-76
: be
droc
k1 0-1: af
1-35
: bedrock
0-12
: Qa
lo12-21: bedrock
Bedrock
silt
ston
e ?
sand
ston
e &
siltstone
sandstone
&sh
ale
sand
ston
e &
silt
ston
e
sandston
e &
siltston
e
sandstone
&sh
ale
shale
shale
shal
e
shale
silt
ston
e
Rema
rks
(depths
in f
eet)
13-19: Pe
trol
eum
seepage.
8-24
: Petroleum
odor.
Sand
ston
e an
d si
ltst
one
interbedded.
Sand
ston
e wi
th in
terb
eds
of s
hale
with
a s
trik
e and
dip
of N
86°W,
12°S
No caving.
25:
Wate
r se
epag
e, 11
/22/
61.
26-29: Me
than
e odor.
Sand
ston
e and
silt
ston
e in
terb
edde
d.
Shal
e be
dded
and s
lightly
fractured.
52,
66,
97:
Petr
oleu
m odors.
48-5
2, 68
: Cemented layers.
46:
Wate
r se
epag
e, 4
/27/
68.
Sand
ston
e with s
hale i
nter
beds
.31
: Petroleum od
or.
No ca
ving
or
water.
39:
Gase
ous
odor
.89
: Oil
stre
aks.
68,
72,
83:
Cemented l
ayers.
No caving.
25:
Wate
r se
epag
e, 10
/18/
73.
36:
Cemented s
ands
tone
layer.
No caving.
27-36: Wa
ter
seep
age,
10
/20/
73.
Shal
e we
athe
red
and
frac
ture
d.22
-24,
32
-35,
43-45:
join
ted
and
hard
ce
ment
ed l
ayers.
No caving.
32:
Slig
ht w
ater
see
page
, 3/18/63.
Shal
e fractured
with s
ands
tone
interbeds
with
str
ike
and
dip
of 1
75°, 49°.
18:
Cemented l
ayer.
No caving.
28:
Wate
r se
epag
e, 7
/11/69.
8-12
: As
phal
tic
stai
n.12
-14,
17-20: As
phal
t.
Map
N
o.
2723
V
2723
W
2723
X
2723
Y
2724
A
2724
B
2724
C
2724
D
2724
E
2724
K
2724
L
2724
M
2724
N
2724
F
2724
6
2724
H
2724
I
Opera
tor^
LACO
B
LACO
B
LACO
B
PC PC MTA
MTA
MTA
MTA
MTA
MTA
MTA
MTA PC PC PC PC
Desi
gnatio
n or
Pur
pose
fou
nd
atio
n
foundation
foundation
fou
nd
atio
n
foundation
WC
-82
WC
-83
WC
-84
WC
-85
WC
-86
WC
-87
WC
-88
WC
-89
foundation
fou
nd
atio
n
fou
nd
atio
n
.
fou
nd
atio
n
Ele
v.(f
eet)
290+
289
300+
326+
256
273
266
260
263
277
290
301
302+
277
281
277
310
Tota
l D
epth
(feet)
35 30 31 26 30 66 51 46 52 61 67 76 71 26 50 41 37
Ge
olo
gy-
'(d
epth
s in
fe
et)
0-1
0:
Qal
o1
0-3
5:
be
dro
ck
0-3
0:
Qal
o
0-1
3:
Qal
o1
3-3
1:
be
dro
ck
0-1
3:
af
13
-26
: b
ed
rock
0-7
: a
f7-2
3:
Qal
o2
3-3
0:
be
dro
ck
0-1
1:
Qal
o1
1-6
6:
be
dro
ck
0-1
5:
Qal/Q
alo
15
-51
: b
ed
rock
0-1
0:
Qa
l/Qa
lo1
0-4
6:
bedro
ck
0-1
0:
Qal/Q
alo
10
-52
: b
ed
rock
0-5
: Q
alo
5-61
:
be
dro
ck
0-1
5:
Qal
o1
5-6
7:
bedro
ck
0-2
2:
Qal
o2
2-7
6:
be
dro
ck
0-2
3:
Qal
o2
3-7
1:
be
dro
ck
0-1
: af
1-2
6:
be
dro
ck
0-4
: af
4-1
8:
Qal
o1
3-5
0:
be
dro
ck
0-6
: af
6-2
3:
Qal
o2
3-4
1:
be
dro
ck
0-2
: Q
alo
2-3
7:
be
dro
ck
Bed
rock
Typ
e
silts
ton
e
silts
tone
sha
le
sha
le
silts
ton
e
silts
ton
e
silts
tone
silts
ton
e
cla
ysto
ne
&silts
tone
cla
ysto
ne
&
silts
ton
e
silts
ton
e
silts
tone
shale
ste
le
Sha
l-e
sha
le
Rem
arks
(de
pth
s in
fe
et)
8-3
5:
Asp
halt
sta
ins.
Sh
ale
th
inly
be
dded
, slig
htly
we
ath
ere
d
and
fractu
red.
21 :
C
emen
ted
laye
r.No
ca
vin
g.
26:
Wat
er
seep
age,
1
0/3
0/6
4.
3-7
: C
avi
ng
.1:
W
ater
se
epag
e,
12
/10
/70
.
11
-13
: S
iltsto
ne
d
ips
25°.
30
-66
: S
iltsto
ne dip
s 6
0°.
No w
ate
r.
38:
Wat
er
en
cou
nte
red
, 1
/29
/62
.
Silt
sto
ne
d
ips
5°.
16
-19
, 3
0-4
2:
H2S
.No
w
ate
r.
Silt
sto
ne
d
ips
60°.
15
-16
: H
?S.
16:
Wat
er
en
cou
nte
red
, 2/5
/62.
5-2
5:
Cla
ysto
ne
.2
5-6
1:
Silt
sto
ne
.
22
-70
: S
iltsto
ne
weath
ere
d.
50
-55
: H
2S.
No cavin
g.
14
, 1
7,
18:
Slight
wate
r se
epag
e.1
0/2
/64
.
Shale
with
san
dst
on
e
len
ses.
Ito c
avin
g.
13:
Wat
er s
eepa
ge,
1/11
/55.
Sha
le w
ith s
ands
tone
len
ses.
No
cavi
ng.
11:
Wat
er e
ncou
nter
ed,
1/9/
65.
Sha
le w
eath
ered
.No
ca
ving
.8: Water
seep
age,
8/
24/5
9.
Map
No.
2724
J
2724
P
2724 Q
2724 R
2725 A
2725 B
2725
C
2725 D
2726 A
2726
B
2727
A
2727
B
Operator^-'
PC LAC IB
PC PC
PC PC PC PC ARCO
SOCA
L
DWP
LACOB
Designation
or P
urpose
foundation
foun
dati
on
foundation
foundation
foundation
foundation
foundation
foundation
West
Adams C
H 2
Expos. Park-St. James
CH 1
water
foun
dati
on
Elev.
(fee
t)
310+
258
267+
274
258
255+
248+
248+
215+
216+
200+
202
Tota
l Depth
(fee
t)
? 16 35 31
40 60 41 40 3100
2500
390
100
Geol
ogy-
Be
droc
k (depths
in f
eet)
Type
0-14
: ?
? 14-?:
bedr
ock
0-1:
af
1-16:
Qalo
0-2:
af
2-35:
Qalo
0-31:
Qalo
0-2:
af
2-40
: Qalo
0-1: af
1-60:
Qalo
0-41:
Qal/Qalo
0-40
: Qa
lo
0-365: Qal/Qalo/Qsp
shale
& 365-3100:
bedrock
slltst
one
0-260: Qal/Qalo
siltst
one
& 260-340: Qs
p shale
340-2500:
bedr
ock
0-390: Qal/Qalo
0-100: Qal/Qalo
Remarks
(depths
in f
eet)
Data f
rom
plot
pla
n.
No lo
g av
aila
ble.
No c
avin
g or
water.
No ca
ving
or
water.
No ca
ving
or
water.
50-60: Cobbles
to 7
inches.
No ca
ving
or
wate
r.
22-39: Ra
veli
ng.
No w
ater
.
365-
2335
: Sh
ale
2335
-261
0: Si
ltst
one
2610-3100: Si
ltst
one
and
shale
interbedded.
40-48: Bo
ulde
rs.
11-42: C
obbl
es.
2727 C
SO
CAL
Garey
Comm.
1
2727 R
DWP
water
2728
A
DWP
wate
r
2729 B
DWP
water
2731 B
ARCO
Silverlake C
omm. A-
l
2731 D
LACF
CD
storm
drain
2731 F
PC
foundation
2732
B
PC
foundation
2732 C
PC
foundation
208+
190
198+
175+
378+
382
399
432
389
2000
390
350
171
8045
18 20 33 55
0-630: Qal/Qalo/Qsp
630-
2000
: be
droc
k
0-390: Qa
l/Qa
l/Qs
p?
0-350: Qal/Qalo
0-171: Qal/Qalo
0-8045:
bedr
ock
0-18
: af
0-20
: Qal/Qalo
0-1: af
1-33
: bedrock
0-4: af
4-33:
Qal/Qalo
33-55: bedrock
siltst
one
shale
sandstone
shal
e
sandst
one
Shal
e fractured
with so
me s
andstone
1ayers.
No ca
ving
or
water.
Sand
ston
e slightly w
eathered w
ith
lens
es o
f shale.
52:
Oily
. No
caving.
16:
Water
seep
age,
4/5/63.
Map
No.
Operator-/
Designation
or Pu
rpos
e
2732 D
PC
foun
dati
on
2732
E
2732 J
2733
A
2733 B
2733
C
2733 D
2733 E
2733
F
PC
2732
H
Caltrans
2732
I PC PC LACFCD
LACFCD
LACFCD
LACF
CD
LACFCD
PC
2733
G
PC
foun
dati
on
2732 F
Caltrans
foundation
2732
G
Caltrans
foun
dati
on
foun
dati
on
foundation
foundation
storm
drai
n
storm
drain
storm
drain
storm
drai
n
storm
drai
n
foundation
foun
dati
on
2733
I PC
foundation
2733
J
PC
foundation
2733
K
PCfoundation
Elev
. (feet)
392
389
382
380
380
373+
372+
357+
344+
340+
338+
360+
374
380+
419
418+
416+
Tota
l De
pth
(fee
t)
46 45 27 40 27 30 26 14 22 38 30 55 35 40 25 24 24
Geology^
(dep
ths
in fe
et)
0-19:
af
19-4
6: be
droc
k
0-23
: af
23-45: be
droc
k
0-27
: af
0-37
: af
/Qal
? 37
-40:
be
droc
k
0-27:
af
0-30:
af
0-1: af
1-
26:
bedr
ock
0-14
: af
0-22:
af
0-38:
af
0-30:
af
0-11:
af
11-55: be
droc
k
0-10:
af
10-35: be
droc
k
0-28:
af
28-40: be
droc
k
0-6: af
6-
25:
bedr
ock
0-9: af
9-24:
bedr
ock
0-14
: af
14-24: be
droc
k
Bedr
ock
sand
ston
e
sand
ston
e
silt
ston
e
sand
ston
e sh
ale
sand
ston
e si
ltst
one
shale
& sa
ndst
one
shal
e &
sand
ston
e
shal
e
shale
shal
e
Rema
rks
(dep
ths
in fe
et)
Sandstone we
athe
red.
25:
Ceme
nted
le
nses
.42:
Oily.
No ca
ving
.18
: He
avy
seepage, 12
/4/6
4.
Sand
ston
e weathered
with
layers of
shale.
35:
Oily.
No ca
ving
. 16:
Heavy
seepage, 12/4/64.
23:
Ground w
ater
surface, 19
48.
19:
Ground w
ater
surface, 1948.
15:
Ground w
ater surface, 19
48.
No ca
ving
.25
: Wa
ter
seepage, 4/17/64.
Sand
ston
e and
shale
inte
rbed
ded,
weat
here
d, and
jointed.
No caving or w
ater
.
Sand
ston
e and
silt
ston
e interbedded
Bedr
ock
badl
y weathered.
10-1
7: Shale massive.
17-35: Sandstone wi
th b
adly w
eathered
shale
layers ev
ery
5 fe
et.
No caving or
water.____________
28-3
0: Shale
laminated.
30-4
0: Sandstone.
No ca
ving
. 31
: Slight w
ater seepage, 7/25/61.
16:
Ceme
nted
le
nses
. No
caving or w
ater.
Shal
e weathered, be
dded
, and wi
th so
megy
psum
. No ca
ving
. 16:
Wate
r seepage, 4/12/76.
Shale we
athe
red
and
bedd
ed.
No c
aving.
14:
Wat
er
seep
age,
4/1
2/7
6.
Map
No.
2733
L
2733
M
2733 N
2733
P
2733
Q
2733 R
2733
S
2734 A
2734
B
2734
C
Oper
ator
!/
Designation
or Pu
rpos
e
PC
foun
dati
on
PC
foundation
PC
foun
dati
on
PC
foundation
PC
foun
dati
on
PC
foun
dati
on
PC
foundation
PC
foun
dati
on
PC
foun
dati
on
PC
foundation
Elev
. (f
eet)
410+
400
392
360+
263+
362+
360+ "
425+
414+
390+
Total
Depth
(feet)
39 47 51 33 26 72 50 25 30 38
Geol
ogyl/
(depths
in f
eet)
0-25:
af25-39: be
droc
k
0-25:
af25
-47:
be
droc
k
0-43
: af
43-5
1: be
droc
k
0-30:
af30
-33:
be
droc
k
0-1:
af
1-26
: be
droc
k
0-30
: af
30-4
3: Qa
lo43
-72:
be
droc
k
0-36:
af36
-41:
Qalo
41-5
0: be
droc
k
0-7: af
7-25:
bedr
ock
0-23
: af
23-3
0: be
droc
k
0-38
: be
droc
k
Bedr
ock
shal
e
shale
shal
e
shal
e
shale
shal
e
shale
shale
shale
shale
Rema
rks
(dep
ths
in feet)
Shal
e weathered.
No ca
ving
.10:
Slight w
ater seepage, 19
55.
Shale
weat
here
d.10
: Co
bble
s to 6
inch
es.
15,
21-2
5, 33
, 37
, 46:
Oil.
3-5: Slight ca
ving
.26:
Moderate water seepage, 7/
3/62
.
Shale
weathered.
8-40:
Severe c
avin
g.30:
Wate
r encountered, 6/26/67.
No ca
ving
.26
: Wa
ter
seepage, 7/
57.
Shal
e weathered, fr
actu
red,
and
thinly laminated.
10,
12,
26:
Gyps
um la
yers
.No caving or w
ater
.
Shale
laminated.
58:
"Str
ong
odor"
61 :
Ceme
nted
layer.
No ca
ving
.26:
Water
seepage, 7/31/63.
No ca
ving
.35
-41:
Sl
ight
water seepage, 3/5/58
Shal
e la
mina
ted.
No caving or
wat
er.
Shale wi
th st
reak
s of s
ands
tone
.No caving o
r wa
ter.
Shal
e thin-bedded, sl
ight
ly w
ea-
ther
ed,
frac
ture
d, and
jointed.
No caving or
water.
2734 D
2734 E
2734
F
2734
6
2734 H
PC PC PC MTA
PC
foundation
foun
dati
on
foundation
WC- 90
foundation
337
339
318
300
309+
61 40 40 63 44
0-3: af
3-61 :
bedr
ock
0-1: af
1-4:
Qa
lo4-
40:
bedr
ock
0-16:
Qalo
16-40: be
droc
k
0-23:
Qalo
23-6
3: be
droc
k
0-23:
Qalo
23-4
4: be
droc
k
shal
e
shale
shal
e
siltston
e
shale
Shale weathered
and
massive.
No ca
ving
.17,
21:
Water
seepage, 5/
7/69
.
Shale
weat
here
d.No ca
ving
.23
: Wa
ter
seepage, 10/28/69.
Shale
weat
here
d.
No caving or w
ater
.
24:
Water
encountered, 2/15/62.
Shale
weat
here
d.No ca
ving
".30
: S
ligh
t w
ate
r se
epag
e,
8/1
5/6
3.
2734
I HO
SP
2734 J
HO
SP
2734 K
HOSP
2734 L
HOSP
2734 M
HO
SP
2734 N
HOSP
Designation
or P
urpose
foun
dati
on
foun
dati
on
foun
dati
on
foun
dati
on
foundation
Elev
. (feet)
342
342
347
355
371
Total
Depth
(feet)
50 43 69 60 50
Geol
ogy-
' (depths
in f
eet)
0-50:
bedrock
0-7: Qa
lo
7-43:
bedr
ock
0-69
: be
droc
k
0-60
: be
droc
k
0-50
: bedrock
Bedr
ock
shale
shale
shale
shale
shale
Rema
rks
(depths
in f
eet)
Shal
e ma
ssiv
e.
10:
Gaseous
odor
. No
caving.
Shal
e massive.
20:
Stro
ng g
aseo
us o
dor.
Shal
e massive.
11 :
Gase
ous
odor
. No
caving.
No caving.
3-26
: Sh
ale
with m
any
ce
foundation
345
400-
40:
bedrock
shale
1ayers.
Raveling in c
emen
ted
layers.
Shal
e massive.
9: "Orlorous
layer".
22:
Slig
ht r
aveling.
2734 P
2734 Q
2734
R
2734 S
2734 T
2734
U
2734 V
2734
W
2734 X
2734 Y
HOSP
HOSP
PC PC PC MTA
PC PC MTA
MTA
foundation
foun
dati
on
foundation
foundation
foundation
WC- 9
1
foun
dati
on
foundation
WC-9
2
WC-93
345
345
335
380+
329+
298
326
303
300
303
40 40 49 49 41 53 50 44 45 50
0-3:
af
3-40
: bedrock
0-40
: be
droc
k
0-20:
af20-49: be
droc
k
0-1:
af
1-49:
bedrock
0-5:
af
5-30:
Qalo
30-4
1 : bedrock
0-26:
Qalo
26-53: be
droc
k
0-3: af
3-34:
Qalo
34-50: be
droc
k
0-13:
af13
-31:
Qalo
31-4
4: bedrock
0-26
: Qa
lo26
-45:
bedrock
0-26:
Qalo
26-5
0: bedrock
shale
shale
shal
e
shale
shale
silt
ston
e
shale
shale
siltstone
siltstone
No c
avin
g.
No c
avin
g.
Shal
e massive, f
ract
ured
, weathered
and wi
th c
emen
ted
lens
es.
34-3
6: Highly c
emented
laye
r.No c
avin
g.32,
35:
Wate
r seepage. 9/13/69.
Shal
e massive.
No ca
ving
or
wate
r.
Shale
fractured.
40:
Ceme
nted
layer.
21-30: Raveling.
40:
Slight w
ater
see
page
, 10/19/68.
Shal
e massive, fr
actu
red,
wea
ther
ed.
Occasional 8-inch c
obble
at ba
se o
f Qa
lo.
No c
aving
or w
ater.
Shal
e we
athe
red.
No c
aving.
23:
Wate
r seepage, 12
/11/
68.
Map
No.
2734
Z
2734
2734
2734
2734
2734
2734
2734
2734
2735
2735
2735
2735
2735
2735
AA BB CC DD EE FF GG HH A B C D E F
Operator-^
PC MTA
Caltrans
Calt
rans
Caltrans
Caltrans
MTA
Caltrans
Calt
rans
Caltrans
PC LAC IB
SOCAL
SOCAL
SOCAL
Desi
gnat
ion
or P
urpo
se
foundation
WC- 9
4
foundation
foundation
foundation
foundation
WC-9
5
foundation
foundation
foun
dati
on
foundation
foundation
SMJ
CH 1
Salvation
Army
CH
1
Std. -Occidental -Alba
ny C
H 1
Elev.
(fee
t)
350+
306
307
306
303
304
295+
325
336
263
280±
252+
274
242+
232
Tota
l Depth
(fee
t)
61 63 58 47 43 42 70 60 69 109
76 34 5117
6225
5400
Geol
ogy-
/ (depths
in f
eet)
0-3:
af
3-
61:
bedrock
0-30
: Qa
lo
30-63: bedrock
0-26
: Qalo
26-58: be
droc
k
0-32:
Qalo
32-47: bedrock
0-30:
Qalo
30-43: bedrock
0-25
: Qa
lo
25-42: bedrock
0-44:
Qalo
44-70: be
droc
k
0-60
: bedrock
0-69
: be
droc
k
0-109: Qal/Qalo
0-20
: af
20-60; Qal/Qalo
60-76; be
droc
k
0-4: af
4-34:
Qal/Qalo
0-132?:
Qal/Qalo
132-5117:
bedr
ock
0-145: Qa
lo
145-
6225
: be
droc
k
0-170: Qal/Qalo
170-220: Qs
p?
220-5400:
bedrock
Bedrock
shal
e (siltstone)
siltst
one
siltstone
& shale
siltstone
& sh
ale
siltstone
& shale
siltst
one
& sh
ale
silt
ston
e
shal
e
shale
shale
shale,
siltstone, &
ot
her
silt
s ton
e,
shale, &
sandstone
shale
& sandstone
Remarks
(depths
in f
eet)
42-44: Hi
ghly
cemented
layer.
No caving.
37:
Slig
ht w
ater
see
page
, 5/
20/7
2.
56:
Bedrock
hard.
26-42: Si
ltst
one.
42
-58:
Shale.
No w
ater
.
32-4
3: Si
ltst
one.
43-47: Shale.
No w
ater.
30-41: Siltstone.
41-43: Shale.
No w
ater
.
25-39: Siltstone.
39-42: Shale.
No w
ater
.
55-60: Pe
trol
ifer
ous.
61-66: Ha
rd s
hale
lay
er i
n si
ltst
one
13-60: Sh
ale
firm
. 23:
Grou
nd w
ater
su
rfac
e, 9/25/49.
Shale
grad
es f
rom
stif
f to
hard
with
depth.
31: Gr
ound
water s
urfa
ce,
9/25
/49.
No w
ater.
35-39:
Few
cobbles
to 8
inches.
36-49: Sl
ight
cav
ing
and
rave
ling
. No
wat
er.
13-33: 20%
cobb
les
to 14 inches.
132-2050:
Shal
e and
siltstone.
800-2250:
Silt
ston
e an
d sa
ndst
one.
2250-2615: Si
ltst
one
and
sand
ston
e.
2615-2850: Shale.
220-
4425
: Shale.
4425-5400: Sa
ndst
one
and
shale.
Map
No.
2736 A
2736
B
2736 C
2736 D
2736 E
2737
A
2737
B
2741
D
2741
E
2743
A
2743
B
2743
C
2744 A
2744
B
2744 C
2744 D
2744
E
Operator-'
LAC IB
SOCAL
SOCAL
PC LACOB
DWP
DUP
LACFCD
LACFCD
LACFCD
PC DWP
Caltrans
Calt
rans
Caltrans
Caltrans
PC
Desi
gnat
ion
or Pu
rpos
e
foundation
Broa
dway
Comm.
CH
1
LA U
nit
Veni
ce C
omm.
1
foundation
foundation
wate
r
water
storm
drain
storm
drain
stor
m drain
foundation
water
foundation
foun
dati
on
foun
dati
on
foun
dati
on
foundation
Elev
. (feet)
242
236+
233+
227+
217
219+
210+
424
440
436
440+
340+
316
317
342
350
383
Tota
l Depth
(fee
tl
62 6220
4200
35 85 820
275
15 17 25 3 517
60 45 33 63 56
Geol
ogy-
' (depths
in f
eet)
0-4: af
4-62:
Qal/
Qalo
0-165: Qa
l/Qa
lo
165-
225:
Qs
p?
225-6220:
bedr
ock
0-25
8: Qa
l/Qs
p 258-1100:
bedr
ock
0-35
: Qa
l/Qa
lo
0-5:
af
5-85:
Qal/
Qalo
0-49
6?:
Qal/
Qalo
49
67-8
20:
bedr
ock?
0-27
5: Qa
l/Qa
lo
0-15:
Qalo
0-17
: Qa
lo
0-13
: af
13-25: be
droc
k
0-2:
af
2-
3: be
droc
k
0-72:
Qalo
72-5
17:
bedr
ock
0-19:
Qt
19-6
0: be
droc
k
0-28:
Qal/
Qalo
28
-45:
be
droc
k
0-33:
bedr
ock
0-20
: af
20-63: be
droc
k
0-24
: af
24
-27:
Qt
27
-56:
be
droc
k
Bedr
ock
silt
ston
e,
shal
e, &
sandst
one
shale
sand
ston
e
sand
ston
e
shale
silt
ston
e &
shale
siltstone
& shale
shal
e
sandstone,
shal
e, &
silt
ston
e
shal
e
Rema
rks
(dep
ths
in fe
et)
8-25:
Cobb
les
to 8
inch
es.
225-2245:
Silt
ston
e and
shale.
2245-2850: Sh
ale
with
interbedded
sandstone.
4-35
: Co
bble
s to 10
in
ches
. Be
low
3: Raveling.
No w
ater
.
5-42:
10%
cobbles.
69-8
5: Fe
w cobbles.
No w
ater
.
496-820: "S
tick
y blue c
lay".
Sandstone
slig
htly
wea
thsr
ed.
No caving or w
ater
.
71-7
2: Oi
l sa
nd.
72-5
17:
Oil
and
gas
satu
rate
d.
22-3
3: "V
ery
stiff
to ha
rd".
33-60: Siltstone
and
shal
e thin-
bedded .
11:
Ground w
ater surface, 6/15/70.
14:
Ground w
ater surface, 6/
11/7
0
26-33: Shale
with
sa
ndst
one
interbeds.
20-2
5: Sa
ndst
one
with
sh
ale
interbeds.
25-6
3: Siltstone
and
shale.
Shal
e wi
th sa
ndst
one
lens
es.
No caving or
water.
Map
No.
Oper
ator
'
Designation
or P
urpo
se
2744 F
PC
foun
dati
on
2744 6
PC
foundation
383
401
Total
Dept
h (f
eet) 49 82
Geol
ogy-
(depths
in f
eet)
0-12
af
12-15: Qt
15-49: bedrock
0-82:
bedrock
shale
shale
2744 H
2744
I
2744 J
2744 K
2744 L
2744 M
Calt
rans
Caltrans
Calt
rans
LACI
B
LACIB
Calt
rans
foundation
foundation
foundation
foundation
foun
dati
on
foundation
374
350
334
336
332
339
73 65 55 99 97 50
0-73
:
0-65
:
0-3:
3-55:
0-99:
0-97:
0-50:
bedrock
bedrock
af Qalo
bedrock
bedr
ock
bedr
ock
shale
shale
shale
shale
shale
& siltston
e
Remarks
(depths
in f
eet)
Shal
e wi
th st
rike
and
dip o
f 190°,
25°
and
with s
ands
tone
lenses.
No c
avin
g or
water.
Shal
e with a
vera
ge s
trik
e an
d dip
of 6
0°,
180°
an
d wi
th t
hin
sand
ston
e in
terb
eds.
No c
avin
g or w
ater.
48-61: Co
nglo
meri
tic
layers.
4-8,
55-59,72-80: Co
nglo
mera
te
1ayers.
0-43
: Shale.
43-50: Siltstone.
21:
Wate
r encountered, 9
/26/
49.
2744 N
Caltrans
foundation
2744 P
LA
CIB
foundation
2744 Q
LACIB
foun
dati
on
2744
R
LACIB
foundation
341 383
387
50 66 65
0-50:
0-66
:
0-65
:
bedrock
bedrock
bedr
ock
shale
sandst
one
& shale
shale
& sandst
one
374
100
0-100: bedrock
shale
No w
ater
.
Bedrock
with
ave
rage
str
ike
and
dip
of 1
82°,
39
°.0-
29:
Sand
ston
e wi
th s
hale
layers.
29-59: Sh
ale
with s
andstone l
ayer
s 59-66: Shale.
Bedrock
with
average s
trike
and
dip
of 1
78°, 45°.
0-40
: Sh
ale wi
th s
andstone i
nter
beds.
40-65: Sa
ndst
one
with
sh
ale
interbeds.
Shale
with
ave
rage
str
ike
and
dip
of 1
77°, 47°
and
with
sandstone
lenses.
2744
S
LACIB
foun
dati
on
2744
T
LACI
B fo
unda
tion
2744
U
LACI
B foundation
377
312
310
101
101
51
0-8:
af
8-101: bedrock
0-6:
af
6-
24:
Qt
24-101:
bedrock
0-3: af
3-12:
Qt
12-51: be
droc
k
shale
shal
e
shale
8-88
: Sh
ale
frac
ture
d an
d bedded.
88-101:
Shal
e ma
ssiv
e.No c
aving.
88:S
liqh
t water
seep
age,
10/24/66.
Shal
e wi
th s
ands
tone
lenses.
17:
Petr
oleu
m od
or.
Shale
with
av
erag
e st
rike
and dip
of 1
90°, 50
° an
d wi
th s
andstone
lenses.
Map
No.
Oper
ator
- Designation
or P
urpose
2744 V
Caltrans
foun
dati
on
2744 W
Ca
ltra
ns
foun
dati
on
2744 X
LACIB
foundation
Total
p/
Elev
. Depth
Geol
ogy-
^ (f
eet)
(f
eet)
(depths
in f
eet)
311
40
0-30
: Qal/Qalo
30-40: bedrock
339
67
0-24:
Qalo
24-67: bedrock
311
60
0-13:
af13-29: Qal/Qalo
29-60: be
droc
k
Bedr
ock
siltstone
& shale
silt
ston
e &
shale
shale
&1 i
mest
one
Remarks
(depths
in feet)
51:
Grou
nd w
ater s
urfa
ce,
24-44: Siltstone.
44-67: Shale.
34:
Grou
nd w
ater
sur
face
,
22-29: Pe
trol
eum
odor
.
6/12/70,
3/12/70,
29-31: Sh
ale
bedded,
frac
ture
d,
and
weathered.
31-58: Shale
massive.
58-6
0: Limestone.
No caving.
2744 Y
LA
CIB
foun
dati
on
2744 Z
PC
foundation
2744 A
A LACIB
foun
dati
on
2744
BB
LACIB
foun
dati
on
2744 C
C PC
2744
DD
PC
2744 E
E PC
2744 FF
PC
foun
dati
on
foun
dati
on
foundation
foundation
307
333
324
343
380
310
313
312
65 94 61 55 85 28 80 80
0-13
: af
13-21: Qal/Qalo
21-65: bedrock
0-7:
af
7-
11:
Qalo
11-9
4: bedrock
0-11
: af
11-36: Qal/Qalo
36/61: bedrock
0-55
: bedrock
0-24
: af
24-85: bedrock
0-5:
af
5-25:
Qal/Qalo
25-28: bedrock
0-23
: af
23-26: Qt
26-80: bedrock
0-20:
af
20-36: Qal/Qalo
30-80: bedrock
shale
shale
shale
shale
shale
shale
shale
shal
e
17:
Stro
ng petroleum
odor
. Li
mest
one
chun
ks a
t ba
se o
f shale.
Shale
weat
here
d and
frac
ture
d.11-35: Shale
bedded.
35-94: Shale wi
th in
dist
inct
bed
ding
.21:
Petr
oleu
m od
or.
No c
aving.
34:
Slig
ht w
ater s
eepa
ge,
3/17/75.
Shale
with
sandstone l
enses.
34:
Stro
ng pe
trol
eum
odor
.
Shale
with a
vera
ge s
trik
e an
d di
p of 1
90°,
65
° and
with
sandstone
lenses.
28:
Stro
ng pe
trol
eum
odor
.
24-62: Shale
bedd
ed a
nd hi
ghly
fractured.
62-85: Shale
mass
ive.
No
ca
ving
or
water.
8: Sa
lt s
treaks.
17:
Petr
oleu
m od
or.
No c
aving.
22,
24:
Wate
r se
epag
e, 9/1/65.
26-4
0: Shale
join
ted
and
weat
here
d40-80: Shale
thic
kly
bedded.
No c
aving.
26:
Slig
ht w
ater s
eepa
ge,
9/17
/70.
Shale
thickly
bedded.
52,
66-69: Cemented layers.
31-36: Sloughing.
31,
35:
Wate
r se
epag
e, 9/
18/7
0.
2744 G
G LACIB
foun
dati
on312
117
0-27:
af
27-37: Qal/Qalo
37-117:
bedrock
shal
eShale
with
limestone
layers.
Map
No.
2744 H
H
2744 II
2744 J
J
2744 KK
2744 L
L
2744 M
M
2744 N
N
2744
PP
2744 Q
Q
2744 R
R
2744 S
S
2744 T
T
2744 U
U
2744 V
V
Operator^-'
Desi
gnat
ion
or P
urpose
PC
foundation
LACIB
foundation
PC
foundation
PC
foundation
LACI
B foundation
PC
foundation
LACIB
foundation
LACI
B foundation
LACIB
foundation
PC
foundation
PC
foundation
PC
foundation
LACIB
foun
dati
on
LACIB
foun
dati
on
Elev.
(fee
t)
304
311
308
292
366
310
305
368
370
291
291
290
306
333
Total
Depth
(fee
t)
27 162
25 25 172
78 105
176
183
40 30 49 77 99
Geology-'
(depths
in f
eet)
0-2: af
2-15
: Qt
15-27: bedrock
0-15
: af
15-1
62:
bedr
ock
0-8:
af
8-25:
bedrock
0-2: af
2-20
: Qal/Qalo
20-2
5: bedrock
0-38:
af38-172:
bedrock
0-29:
af29-39: Qal/Qalo
39-78: bedrock
0-21
: af
21-23: Qal/Qalo
23-105:
bedrock
0-176: bedrock
0-183: bedrock
0-6:
af
6-21
: Qal/Qalo
21-4
0: bedrock
0-13:
af13-23: Qal/Qalo
23-30: bedrock
0-9:
af
9-20:
Qal/Qalo
20-49: bedrock
0-16:
Qalo
16-7
7: bedrock
0-13
: af
13-1
8: Qalo
18-99: bedrock
Bedrock
shal
e
shal
e
shal
e
shal
e
shale
shal
e
shale
shale
shale
shal
e
shal
e
shale
shale
shal
e
Rema
rks
(dep
ths
in fe
et)
Shal
e fr
actu
red
and
bedded.
2-8: Petroleum
odor
.6:
Salt s
trea
ks.
No caving.
15,
21:
Slight w
ater seepage, 9/
1/65
.Sh
ale
high
ly w
eath
ered
an
d fractured.
21,
42:
"Odo
rous
."No c
aving.
26,
66:
Wate
r seepage, 2/
27/7
1.Shale
slig
htly
fra
ctur
ed an
dth
ickl
y bedded.
No ca
ving
or
water.
Shal
e slightly f
ract
ured
.7: Petroleum
odor
.No caving.
8, 14:
Water
encountered, 9/
2/65
.
Shal
e with limy la
yers
.19
: 18 i
nch
boul
der.
39-41: Shale
join
ted
and
weathered.
41-7
8: Shale
thickly
bedded.
No ca
ving
.32
, 36,
39:
Water
seep
age,
9/
18/7
0
Shale
with a
verage s
trik
e an
d di
pof
215°, 30°
and
with li
my la
yers
.
Shale
with strike a
nd d
ip o
f 20
0°,
20°
and
with l
imy
layers.
Shale
thic
kly
bedded.
11 :
Petrleum o
dor.
18-21: Slight s
loug
hing
.18:
Wate
r en
coun
tere
d, 2/
14/6
8.
Shale
thickly
bedded.
3-6:
Co
bble
s to 6
in
ches
.No
caving.
18:
Wate
r seepage, 12/30/64.
Shal
e th
ickl
y bedded.
9-17
: Petroleum
odor.
14-17: Slight s
loug
hing
.14
: Wa
ter
encountered, 2/
15/6
8.
23,
38-4
2, 56,
63:
Cong
lome
rate
laye
rs in s
hale
.Qa
lo w
ith
cobbles
at ba
se.
Map
No.
2744
WW
2744
XX
2744
YY
2744
ZZ
2744
AM
2744
BB
B
2744
CCC
2744
ODD
2744 EE
E
2744
FFF
2744
GGG
2744
HHH
2744
III
Operator^-
Desi
gnat
ion
or P
urpo
se
LACI
B foundation
LACIB
foun
dati
on
PC
foun
dati
on
PC
foundation
PC
foundation
PC
foun
dati
on
PC
foun
dati
on
LACIB
foundation
LACI
B fo
unda
tion
LACIB
foundation
PC
foun
dati
on
PC
foun
dati
on
PC
foun
dati
on
Total
ox
Elev.
Depth
Geol
ogy^
7 (f
eet)
(f
eet)
(d
epth
s in feet)
318
134
0-3:
af
3-134: be
droc
k
332
93
0-17:
af
17-23: Qa
lo
23-93: be
droc
k
303
80
0-50:
af
50-80: be
droc
k
313
50
0-2:
af
2-5:
Qalo
5-50:
bedr
ock
303
80
0-8:
af
8-
12:
Qal/
Qalo
12-80: be
droc
k
292
100
0-14
: af
14-22: Qa
l/Qa
lo
22-1
00:
bedr
ock
289
81
0-8:
af
8-
24:
Qal/
Qalo
24-81: be
droc
k
297
81
0-2:
af
2-31:
Qal/
Qalo
31-81: be
droc
k
299
81
0-22:
Qal/
Qalo
22-81: be
droc
k
301
101
0-2:
af
2-13:
Qal/
Qalo
13
-101
: be
droc
k
330
40
0-2:
af
2-4: Qalo
4-40:
bedr
ock
309
80
0-5:
af
5-10:
Qalo
10-80: be
droc
k
318+
5
0-3:
af
3-5: be
droc
k
Bedr
ock
shale
shal
e
shal
e
shale
(sil
tsto
ne)
shal
e
shale
shal
e
shal
e
shale
shal
e
shale
shale
silt
ston
e
Rema
rks
(dep
ths
in fe
et)
Shal
e wi
th in
term
itta
nt co
nglo
mer
ate
laye
rs.
Shale
with
intermittant co
nglo
mer
at
e la
yers
.
Shale
thic
kly
bedd
ed.
No caving or
water.
5-32:
Bedr
ock
weat
here
d.
32-5
0: Be
droc
k unweathered.
No ca
ving
. 25
: Slight w
ater
seepage, 9/15/75.
12-34: Sh
ale
weathered
and jo
inte
d 34
-80:
Sh
ale
thic
kly
bedd
ed.
19-34: Pa
tche
s of
oil.
No ca
ving
or
water.
22-28: Sh
ale
weathered
and
join
ted
28-1
00:
Shale
thic
kly
bedd
ed.
37,
71,
81:
Ceme
nted
1 avers 2'
th
ick
21-2
3: Raveling.
21:
Wate
r seepage, 12/12/68.
24-32: Shale
weathered
and
jointed.
32-8
1: Shale
thic
kly
bedd
ed.
14:
Petr
oleu
m od
or.
22-2
4: Raveling.
22-24: Water
seepage, 12/11/68.
Shale
with
minor sa
ndst
one
inte
r-
laye
rs.
Shal
e wi
th m
inor
sa
ndst
one
laye
rs.
Shale
with
min
or sa
ndst
one
laye
rs.
Shal
e weathered, fractured, and
thic
kly
bedd
ed.
24:
Gase
ous
odor.
28,
35,
36:
Cemented la
yers
. No
caving or w
ater.
Shale
massive.
20:
Strong ga
seou
s odor.
21-2
3, 31
, 34:
Cemented la
yers
.
4: Ga
seou
s od
or.
No caving or w
ater.
Map
No.
2744
JJJ
2744 K
KK
2744 I
LL
2744 M
MM
2744
NNN
2744 P
PP
2744 Q
2744 R
RR
2744 S
SS
2744 T
TT
2745
A
Operator-/
Designation
or P
urpose
PC
foun
dati
on
PC
foundation
PC
foundation
PC
foundation
PC
foun
dati
on
PC
foundation
PC
foun
dati
on
LACI
B foundation
LACI
B foundation
PC
foun
dati
on
LACIB
foun
dati
on
Tota
l 2/
Elev.
Depth
Geol
ogy-
^ (f
eet)
(f
eet)
(depths
in f
eet)
296+
20
0-4:
af
4-20:
bedr
ock
325
40
0-10:
af
10-12: Qalo
12-40: bedrock
293
80
0-8: Qalo
8-80:
bedrock
283
58
0-3:
af
3-18:
Qal/Qalo
18-58: bedrock
279
59
0-12
: af
12-16: Qal/Qalo
16-5
9: bedrock
284
20
0-8:
af
8-20:
Qal/Qalo
293
60
0-17
: Qal/Qalo
17-60: bedrock
286
77
0-4: af
4-19:
Qalo
19-77: bedrock
297
81
0-1:
af
1-31
: Qal/Qalo
31-81: bedrock
393
71
0-2: af
2-13:
Qt
18-71: bedrock
279
52
0-3: af
3-15
: Qa
l/Qa
lo
15-52: bedrock
Bedrock
silt
ston
e,
sand
ston
e,
shale, &
1 imestone
shale
shale
& sandst
one
shale
shal
e
shal
e
shale
shal
e
shal
e
shale
Remarks
(depths
in fe
et)
4-10:
Siltstone.
10-12: Sa
ndst
one.
12-14: Shale.
14-1
5, 1
8: Limestone.
15-20: Sandstone.
No ca
ving
or
water.
Shale
weat
here
d, fr
actu
red,
an
d thickly
bedded.
19:
Gase
ous
odor
. 0-10:
Rave
ling
. No
water.
8-10
: Shale
high
ly w
eathered.
10-37: Sa
ndst
one
high
ly w
eath
ered
. 37-80: Shale
massive,:
30-39: Sloughing.
30-39: Sl
ight
wat
er s
eepa
ge,
5/28/72
Shale
with thin s
andstone b
eds.
14-28: So
me c
obbles to 10
inches.
No c
aving.
25:
Wate
r se
epag
e, 8/8/70.
Shale
massive.
12-16: 15
% cobbles.
16:
Petroleum
odor
. 32,
51:
Hard
layer.
No c
avin
g or
water.
8-11
: Pe
trol
eum
odor
. No
cav
ing
or w
ater
.
No caving.
29:
Slig
ht wat
er s
eepa
ge,
1957.
Shale
very
har
d at
base.
Shal
e wi
th o
ccas
iona
l sa
ndst
one
layers up
to
2' thick.
27-31: Caving.
27:
Seve
re w
ater
see
page
, 12/15/67.
Shale
thic
kly
bedded,
frac
ture
d,
and
with a
str
ike
and
dip
of
275°,
53°.
No ca
ving
or
water.
10-15: Co
bble
s.
Map
No.
2745
B
2745 C
2745 D
2745
E
2745 F
2745
G
2745 H
2745
I
2745 J
2745 K
2745 L
Operator-^
Desi
gnat
ion
or P
urpose
LACIB
foundation
LACI
B foundation
LACI
B foundation
PC
foundation
PC
foundation
MTA
WC-96
LACF
CD
storm
drai
n
LACIB
foun
dati
on
MTA
WC- 9
7
LACIB
foun
dati
on
PC
foun
dati
on
Total
21
Elev
. Depth
Geol
ogy^
(.feet)
(fee
t)
(depths
in f
eet)
275
TOO
0-2:
af
2-25:
Qal/Qalo
25-100:
bedrock
274
TOO
0-9:
af
9-22:
Qal/Qalo
22-100:
bedrock
250
19
0-8:
af
8-11
: Qal/Qalo
11-19: be
droc
k
275
80
0-14:
af
14-1
8: Qal/Qalo
18-80: bedrock
271
55
0-32:
Qal/Qalo
32-55: be
droc
k
278
59
0-57:
Qal/Qalo
57-5
9: be
droc
k
268
82
0-2: af
2-57:
Qal/Qalo
57-8
2: bedrock
268
82
0-2: af
2-58:
Qal/Qalo
58-8
2: bedrock
270
56
0-42
: Qa
l/Qa
lo
42-56: bedrock
266
80
0-2:
af
2-71:
Qal/Qalo
71-80: bedrock
273
71
0-2:
af
2-30:
Qal/Qalo
30-71: bedrock
Bedrock
shal
e
shale
shal
e
shale
shale
si Its
tone
shal
e
shale
shale
shale
shale
(sil
tsto
ne)
Remarks
(depths
in fe
et)
12-25: 5%
-10%
cob
bles
. 12
-26:
Ra
veli
ng.
25-2
6, 52-55: Sl
ight
wat
er s
eep
ag
e, 5/8/65.
11-2
2: Co
bble
s and
a fe
w bo
ulde
rs.
11-22: Raveling.
22:
Slig
ht w
ater s
eepa
ge,
5/8/65.
18-38: Shale
weat
here
d and
jointed.
38-80: Shale
thickly
bedded.
49,
79-80: Cemented l
ayers.
14-18: Co
bble
s to
8 inches.
15-18: Ra
veli
ng.
47,
79:
Wate
r se
epag
e, 1/23/70.
32-33: Sh
ale
weat
here
d an
d jointed.
33-55: Shale
thickly
bedded.
15-32: 10%-15%
cobb
les
to 8
in
ches
. 27-32: Heavy
caving.
29:
Wate
r se
epag
e, 1/
23/7
0.
13-31: 10%
cobb
les
to 10
inches
with
occasional
boulders to
20
inches.
12-3
1: 10%
cobbles
with
occ
asio
nal
boul
ders
. 13-31: Ra
veli
ng.
55:
Water
seepage, 11
/23/
69.
12-29: 10%
cobbles
and
some
boulders t
o 18
inches.
13-22: 5%
-10%
cob
bles
to
8 inches.
22-28: 10
-20%
cobbles t
o 12
in
ches
27:
Strong pe
trol
eum
odor.
38:
Occasional patches
of n
atural
tar.
W, K-tt,
53-55, 57-55: Ce
ment
edlenses.
Bedr
ock
high
ly w
eath
ered
. 18-30: Raveling.
30:
Slig
ht w
ater s
eepa
ge,
10/1
0/70
.
Map
No.
2745 M
2745 N
2745 P
2745 Q
2745 R
2745 S
2745 T
2745 U
Operator-^
PC LAC IB
LAC IB
LAC IB
MTA
LAC IB
MTA
MTA
Designation
or Pu
rpos
e
foundation
foundation
foun
dati
on
foundation
WC- 98
foundation
WC-9
9
WC- 10
0
Elev.
(feet)
274
271
272
268
266
267
265
262
Total
Depth
(fee
t)
75 62 72 79 49 70 45 51
Geol
ogy-
' (d
epth
s in
fe
et)
0-7: af
7-32
: Qa
l/Qa
lo
32-7
5: be
droc
k
0-48
: Qa
l/Qa
lo
48-6
2: be
droc
k
0-8:
af
8-
48:
Qal/
Qalo
48
-72:
be
droc
k
0-12
: af
12
-72:
Qa
l/Qa
lo
72-7
9: be
droc
k
0-49
: Qa
l/Qa
lo
0-13
: af
13-69: Qa
l/Qa
lo
0-45
: Qa
l/Qa
lo
0-51:
Qal/
Qalo
Bedr
ock
Rema
rks
Type
(dep
ths
in fe
et)
shale
22-3
0: Co
bble
s to
10 in
ches
, (s
ilts
tone
) 41 Strong petroleum
odor.
52,
62:
Ceme
nted
layer.
22-30: He
avy
raveling.
30:
Slight seepage, 10
/11/
70
shal
e 12-23
: Co
bble
s to 8
inch
es.
shal
e
shale
12-33: Cobbles.
13-2
0: Co
bble
s and
boulders.
24-4
0: Occasional cobbles.
2774
V
2745 W
LAC IB
PC
foun
dati
on
foundation
260
259
72 60
0-72
: Qa
l/Qa
lo
0-60:
Qal/
Qalo
2745 X
2745 Y
2745 Z
2745 AA
2745 BB
2745 C
C
2745 D
D
MTA
MTA
MTA
DWP
MTA
PC PC
WC-1
03
WC-1
02
WC-4
01
water
WC-1
01
foundation
foundation
266
262
261
258+
261
254+
254+
63 62 66 292
56 50 35
0-63
: Qa
l/Qa
lo
0-62
: Qa
l/Qa
lo
0-66:
Qal/
Qalo
0-13
7: Qa
l/Qa
lo
137-
292:
bedrock?
0-56
: Qa
l/Qa
lo
0-2: af
2-50:
Qal/
Qalo
0-12:
af
12-35: Qa
l/Qa
lo
10-24: Sc
atte
red
cobbles.
18-20: Concentrated co
bble
s.22-34: Strong petroleum
odor
.
13-16: Some cobbles.
16-27: La
rge
amount of
cob
bles
to
12 in
ches
. 13-26: Ca
ving
. No w
ater
.
0-30:
Cobb
les
to 12 in
ches
. 37
-66:
Co
bble
s to 10
in
ches
. No
water.
Bedrock: "blue
clay".
46-50, 80
-91:
Ce
ment
ed la
yers
.
8-10:
Cobb
les
to 6
inch
es.
10-4
2: Co
bble
s to
8
inch
es.
Belo
w 10
: Raveling.
37:
Wate
r seepage, 2/
21/6
5.
4-12:
10%
cobbles.
12-25: 20%
cobbles.
33-35: Fe
w cobbles.
0-24
: Ca
ving
. No
wat
er.
Map
No.
2745
EE
2746 A
2746
B
2746
C
2747
A
2747 B
2747
C
2747
D
2748 A
2751
A
2752
A
2752
B
2752 C
2753
A
2753
B
2753
C
2753
D
Oper
ator
-/
LACI
B
;DWP SOCAL
SOCA
L
DWP
DWP
SOCAL
SOCAL
DWP
PC LACFCD
LACF
CD
LACFCD
LACFCD
LACFCD
PC PC
Desi
gnat
ion
or Pu
rpos
e
foundation
wate
r
Wall
CH 2
Veni
ce C
omm.
CH
1
wate
r
water
Wall
CH
1
Menlo
CH
1
water
foun
dati
on
storm
drai
n
storm
drain
storm
drain
storm
drain
stor
m dr
ain
foundation
foun
dati
on
Elev.
(.fe
et)
259
242+
237
226+
225+
228+ 224
217 204+
475+
442
432
432
416
399
442
428
Total
Depth
(fee
t)
70 499
5685
6485
462
320
6764
4500
170
60 20 20 16 16 20 40 40
Geol
ogy-
' (d
epth
s in fe
et)
0-2: af
2-70:
Qal/
Qalo
0-23
0: Qa
l/Qa
lo
230-
499:
bedrock?
0-152: Qa
l/Qa
lo
152-
245:
Qsp
245-5685:
bedr
ock
0-47
0: Qa
l/Qa
lo/Q
sp
470-
6485
: be
droc
k
0-46
2: Qa
l/Qa
lo
0-32
0: Qa
l/Qa
lo
0-45
0: Qal/Qalo/Qsp
450-
6764
: be
droc
k
0-39
5: Qa
l/Qa
lo/Q
sp
395-4500:
bedr
ock
0-17
0: Qa
l/Qa
lo
0-53:
Qal/
Qalo
53-60: be
droc
k
0-18:
Qal/
Qalo
18-20: be
droc
k
0-20
: Qa
l/Qa
lo
0-9: af
9-16
: be
droc
k
0-13
: af
13-16: be
droc
k
0-2: af
2-20
: be
droc
k
0-28
: af
28-40: be
droc
k
0-28
: af
28-40: be
droc
k
Bedr
ock
? shal
e &
other
siltstone,
shal
e, &
other
silt
ston
e &
other
shale,
sand
ston
e, &
other
sand
ston
e
shal
e
silt
ston
e &
sand
ston
e
silt
ston
e
sandst
one
& siltstone
sand
ston
e &
silt
ston
e
silt
ston
e
Rema
rks
(dep
ths
in fe
et)
6-33
: 15
% co
bble
s to
12 in
ches
. 41
-55:
Fe
w cobbles.
24:
Petr
oleu
m odor.
Bedr
ock
correlated w
ith
that of
2736 B.
8-25
, 95
-100
, 173-176: Boulders.
454-458: Oil
sand
.
245-2000:
Shal
e.
470-
2100
: Si
ltst
one
and
shal
e.
450-2150:
Silt
ston
e.
395-
1075
: Sandstone
and
shale.
1075-2200: Sh
ale.
9-14
: Si
ltst
one.
14
-16:
Sandstone.
Sand
ston
e and
silt
ston
e in
terb
edde
d.
28-33: Sa
ndst
one
with
5-inch co
bble
s 33
-40:
Siltstone.
37:
Ceme
nted
la
yer.
No
caving or w
ater
.
Silt
ston
e wi
th some s
ands
tone
in
terb
eds.
6-12
: Ga
seou
s od
or.
26-2
8: Co
bble
s to 8
inch
es.
38:
Cemented layer.
No ca
ving
or
wat
er.
Map
No.
Operator-^-'
Designation
or P
urpose
2753 E
PC
foundation
2753
F
LACF
CD
foun
dati
on
2753 G
PC
fo
unda
tion
2753
H
PC
foun
dati
on
2753
I
PC
foun
dati
on
2753 J
PC
foundation
2754 A
PC
foundation
2754 B
PC
foun
dati
on
Elev.
(fee
t) 419
375
381
338
347
350
386
380
Total
Depth
(fee
t) 35 16 20 30 30 36 41 39
Geol
ogy
(depths
in f
eet)
0-15
: af
15-35: bedrock
0-12:
af
12-16: bedrock
0-15:
af
15-20: bedrock
0-9:
af
9-
30:
bedrock
0-1:
af
1-30:
bedrock
0-15
: af
15-36: be
droc
k
0-1: af
1-41:
bedr
ock
0-2: af
2-40:
bedrock
Bedrock
siltst
one
& sandst
one
siltst
one
sandstone
shal
e
shale
shal
e
shale
shale
Remarks
(depths
in f
eet)
Silt
ston
e and
sandstone
interbedded.
14:
Cobbles.
No c
aving.
4-8:
Slight water s
eepa
ge,
4/11
/66.
4-12
: H2
S od
or.
Sand
ston
e we
athe
red.
No
ca
ving
or
wate
r.
Shale
slightly f
ractured.
8-12:
Petr
oleu
m od
or.
22:
Cemented l
ayer.
No c
aving.
15-17: Sl
ight
water s
eepa
ge,
7/2/68.
Shal
e sl
ight
ly f
ract
ured
wit
h av
erag
e st
rike
and
dip
of
192°,31
C No
caving.
15:
Water
seepage, 7/2/68.
Shale
slightly f
ract
ured
. No
caving.
28:
Wate
r se
epag
e, 7/1/66.
Shale
bedd
ed a
nd hi
ghly
weathered.
No ca
ving
or
water.
Shal
e we
athe
red
and
with
len
ses
of sandstone.
2754
C
2754
D
2754
E
2754
F
2754 G
2754
H
PC LACO
B
LACOB
PC LACO
B
LACO
B
foundation
foundation
foundation
foundation
foundation
foundation
385
401
391
393
384
394
36 66 61 44 59 76
0-24:
af
24-36: be
droc
k
0-2:
af
2-66:
bedr
ock
0-16
: Qa
l/Qa
lo
16-61: bedrock
0-32
: af
32-44: bedrock
0-59:
bedrock
0-1:
Qt
1-76:
bedrock
shale
shale
shale
shal
e
siltst
one
siltst
one
24:
Oily o
dor.
No caving.
33:
Slig
ht w
ater
see
page
, 12/24/62.
Shal
e be
dded
and
wea
ther
ed.
12-25: Ca
ving
up
on r
emoval of
casing.
No w
ater.
Shal
e be
dded
and w
eath
ered
. 17-32: Ca
ving
up
on r
emoval of
casing.
No w
ater
.
Map
No.
2754 I
2754 J
2754
K
2754 L
2754 M
Oper
ator
-'
LACOB
LACO
B
LACOB
PC PC
Designation
or Pu
rpos
e
foundation
foundation
foun
dati
on
foun
dati
on
foundation
Elev.
(feet)
380
377
404
390
400
Total
Dept
h (feet)
80 60 98 36 46
Geol
ogy-
' (d
epth
s in feet)
0-2: Qt
2-80:
bedr
ock
0-60
: be
droc
k
0-4: af
4-
98:
bedr
ock
0-36
: be
droc
k
0-36
: af
36
-46:
be
droc
k
Bedr
ock
sandstone
& shale
sand
ston
e &
shal
e
shale
shale
shale
Rema
rks
(dep
ths
in f
eet)
Sandstone
and
shale
inte
rbed
ded.
22
: Gas
odor.
Sand
ston
e an
d sh
ale
inte
rbed
ded.
Shal
e weathered.
No ca
ving
or w
ater
.
Shale
bedd
ed,
weathered, and
interbedded
with
sandstone.
2754 N
LACOB
foun
dati
on405
650-65:
bedr
ock
shal
e
21-3
6: Caving upon re
mova
l of
casi
ng.
No w
ater
.
Shale
with
sandstone
laminations.
2754
P
2754
Q
2754
R
2754
S
2754
T
2754
U
2754
V
2754
W
2754
X
2754
Y
2754
Z
LACO
B
LACO
B
LACO
B
LACO
B
LACO
B
LACO
B
LACO
B
LACO
B
LACO
B
LACO
B
LACO
B
foundation
foundation
foundation
foundation
foundation
fou
nd
atio
n
foundation
foundation
foundation
foundation
foundation
404
399
407
403
403
401
413
382
375
383
360
51 45 51 75 66 36 105
76 70 62 60
0-5
1:
0-1
1:
11-2
2 22
-45
0-5
1:
0-5
9:
59-6
5 65
-75
0-3
5:
35-4
2 42-6
6
0-2
2:
22-3
1 3
1-3
6
be
dro
ck
af
: Q
al/Q
alo
:
be
dro
ck
be
dro
ck
af
: Q
al/Q
alo
:
be
dro
ck
af
: Q
al/Q
alo
:
be
dro
ck
af
: Q
al/Q
alo
:
be
dro
ck
0-6
: a
f 6
-10
5:
be
dro
ck
0-3
4:
34-7
6
0-6
0:
0-3
0:
30-6
2
0-6
0:
af
: b
ed
rock
be
dro
ck
af
: b
ed
rock
be
dro
ck
sha
le
shale
sha
le
shale
sha
le
shale
sha
le
sha
le
silts
tone
& sh
ale
silts
tone &
sa
ndst
one
sandst
one
& sh
ale
Sha
le w
ith
sandst
one
inte
rbeds.
Sha
le w
ith
sandst
one
len
ses.
25
-28
: C
obble
s.
35
-50
: B
rick.
Sha
le w
ith
sandst
one
inte
rbeds.
52:
Petr
ole
um
odor.
Sha
le w
ith
aver
age
str
ike
and
dip
o
f 2
70
°,
45
°.
Silt
sto
ne
and
sha
le
inte
rbe
dd
ed
. 9:
G
as
od
or.
San
dsto
ne
and
sha
le
inte
rbe
dd
ed
.
Map
No.
2754 A
A
2754 BB
2754
CC
2754 D
D
2754
EE
2754
FF
2754 G
G
2754 H
H
2754
II
2754
JJ
2754
KK
2754 L
L
2754 m
2754
NN
2754
PP
2754 Q
Q
2754 RR
2754 SS
Operator-*-'
LACO
B
MTA
LACO
B
LACOB
LACOB
LACOB
LACO
B
LACO
B
LACO
B
MTA
LACOB
LACO
B
LACOB
LACO
B
LACOB
MTA
LACOB
PC
Designation
or Pu
rpos
e
foun
dati
on
wc-m
foundation
foundation
foun
dati
on
foundation
foundation
foundation
foundation
WC-1
10
foundation
foundation
foun
dati
on
foundation
foundation
WC- 10
9
foundation
foundation
Elev.
(fee
t)
359
329
331
361
401
399
371
416
315
337
316
317
334
315
326
320
309
286
Tota
l Depth
(fee
t)
60 84 61 60 99 120
45 131
21 106
70 31 75 55 40 66 38 85
Geol
ogy-
^ (d
epth
s in feet)
0-27:
Qal/
Qalo
27
-60:
be
droc
k
0-5: af
5-84:
bedr
ock
0-2:
af
2-
61 :
bedr
ock
0-9:
af
9-60:
bedr
ock
0-10
: af
10
-12:
Qa
l/Qa
lo
12-9
9: be
droc
k
0-1:
af
1-120: be
droc
k
0-33:
af
33-45: be
droc
k
0-20
: Qa
l/Qa
lo
20-1
31:
bedr
ock
0-6:
af
6-
21 :
bedr
ock
0-12
: af
12-1
06:
bedr
ock
0-5:
af
5-70:
bedr
ock
0-8:
af
8-
31 :
bedr
ock
0-1:
af
1-
75:
bedr
ock
0-8:
af
8-55:
bedr
ock
0-22
: af
22
-40:
be
droc
k
0-11:
af
11-66: be
droc
k
0-31:
Qal/
Qalo
31
-38:
be
droc
k
0-10:
af
10-1
2: Qa
l/Qa
lo
12-8
5: b
edro
ck
Bedr
ock
si Its
ton
e &
claystone
siltstone
shal
e &
sand
ston
e
shale
shale
shal
e
shal
e
shal
e
silt
ston
e
silt
ston
e &
clay
ston
e
shale
shal
e
shale
shal
e
silt
ston
e
clay
ston
e &
siltstone
shal
e
shale
Rema
rks
(dep
ths
in fe
et)
Silt
ston
e di
ps 60
°.
Shale
and
sand
ston
e interbedded
with
ave
rage
strike an
d di
p of
N8
5°W,
55
°S.
Shal
e wi
th strike a
nd dip
of
270°
, 60
°.
Shal
e with av
erag
e strike a
nd
of ENE, 48°.
Shale
with
sa
ndst
one
inte
rbed
s
Shale
with
sa
ndst
one
lens
es.
4-12
: Co
bble
s and
boulders.
Bedr
ock
dips to
90
°.
Shal
e wi
th sandstone
lens
es.
30-6
6: Claystone.
30-6
6: Siltstone.
No wa
ter.
22-3
1: Co
bble
s to 10 in
ches
.
Shal
e wi
th in
dist
inct
bed
ding
. 10-12: Cobbles.
6-11
: Ra
veli
ng.
dip
12,
77:
Slight w
ater seepage,
6/29/69.
Map
No.
2754 T
T
2754
UU
2754 V
V
2754 W
W
2754 X
X
2754 Y
Y
2754 ZZ
2754 A
AA
2754 BB
B
2754 CC
C
2754 O
DD
2754 EE
E
2754
FFF
Operator^-'
Designation
or P
urpose
LACO
B fo
unda
tion
PC
foun
dati
on
LACO
B fo
unda
tion
PC
foun
dati
on
PC
foun
dati
on
MTA
WC -1
08
PC
foun
dati
on
PC
foun
dati
on
MTA
WC-1
07
MTA
WC-1
06
PC
foun
dati
on
PC
foundation
PC
foun
dati
on
Elev
. (f
eet)
325
325
408
395
302
295
304
299
287
283
288
289
286
Total
Depth
(fee
t)
65 37 106
55 59 44 50 55 52 61 34 73 82
Geol
ogy-
' (depths
in f
eet)
0-10
: Qal/Qalo
10-6
5: bedrock
0-37:
af
0-10:
af
10-1
06:
bedrock
0-16:
Qal/Qalo
16-5
5: bedrock
0-32:
af
32-5
9: bedrock
0-25:
Qal/Qalo
25-4
4: bedrock
0-38:
af
38-5
0: bedrock
0-31:
af
31-5
5: bedrock
0-20:
Qal/Qalo
20-5
2: bedrock
0-19:
Qal/Qalo
19-6
1: bedrock
0-11:
af
11-17: Qal/Qalo
17-34: be
droc
k
0-11:
af
11-1
9: Qal/Qalo
19-7
3: bedrock
0-12:
af
12-15: Oal/Oalo
15-82: bedrock
Bedrock
shale
sandstone,
shale, &
siltst
one
shal
e
shal
e
siltst
one
shale
shal
e
silt
ston
e
silt
ston
e
shal
e
shale
shale
Rema
rks
(dep
ths
in f
eet)
9-37:
Caving u
pon
removal
of c
asin
g.
No w
ater.
10-2
3: Cobbles, sa
ndst
one,
and s
hale
23
-25:
Si
ltst
one.
25
-58:
Sa
ndst
one
and
shal
e.
58-1
06:
Shale.
Shale
thickly
bedd
ed a
nd f
ract
ured
. 9-16:
Some
cobbles t
o 8
inches.
12-1
5: Ra
veli
ng a
nd s
loughing.
13:
Water
seepage, 8/
21/6
8.
Shale
thin
ly l
amin
ated
.
Shal
e sl
ight
ly f
ractured.
22-2
7: Few
cobb
les
to 8
inches.
33-3
8: 12%
cobb
les
to 8
inc
hes.
32
-38:
Ca
ving
. 36-38: Wa
ter
seepage, 4
/19/69.
Shal
e we
athe
red
and
fractured.
26-3
1: 15
% co
bble
s.
3-4:
Raveling.
30:
Slig
ht w
ater
see
page
, 11/17/69.
No w
ater.
No w
ater.
11-1
7: F
ew c
obbl
es.
Shale
thickly
bedd
ed.
11-1
9: C
obbl
es t
o 6
inches.
73:
Ceme
nted
lay
er.
5-11
: Caving.
11-1
9: Raveling.
No w
ater.
15-20: Shale weathered
and
join
ted
?0-32: Sh
ale
thic
kly
bedd
ed.
31,
41:
Cemented l
ayers.
43-45: Li
mest
one
laye
r.
12-14: Sl
ight
rav
elin
g.
14:
Very
sli
ght wa
ter
seep
age,
10/24/69.
12-1
5: Few
cobb
les.
Map
No.
2754 G
GG
2754
HH
H
2754
II
I
2754
JJJ
2754 KKK
2754 LL
L
2754 MMM
2754
NNN
2754 S
SS
2754 T
TT
2755
A
2755 B
Operator-^
Designation
or P
urpose
PC
foun
dati
on
PC
foundation
PC
foundation
PC
foun
dati
on
PC
foun
dati
on
PC
foun
dati
on
PC
foun
dati
on
MTA
WC- 105
LACOB
foun
dati
on
LACOB
foun
dati
on
MTA
WC-1
04
PC
foun
dati
on
Elev.
(fee
t)
284
280
281
275
270
268
280
278
417
370
272
266
Total
Depth
(fee
t)
65 60 65 58 65 43 40 75 115
67 82 40
Geol ogy-'
(dep
ths
in fe
et)
0-6: af
6-20:
Qal/
Qalo
20-65: be
droc
k
0-3:
af
3-35:
Qal/
Qalo
35
-60:
be
droc
k
0-11
: af
11-15: Qa
l/Qa
lo
15-6
5: be
droc
k
0-2: af
2-29:
Qal/
Qalo
29
-58:
be
droc
k
0-11
: af
11-2
6: Qa
l/Qa
lo
26-6
5: be
droc
k
0-6:
af
6-24
: Qa
l/Qa
lo
24-4
3: be
droc
k
0-4:
af
4-
17:
Qal/
Qalo
17
-40:
be
droc
k
0-16:
Qal/
Qalo
16
-75:
be
droc
k
0-5: Qa
lo
5-115: be
droc
k
0-26:
af
26-67: be
droc
k
0-42:
Qal/
Qalo
42
-82:
hP
drnc
k
0-2:
af
2-33:
Qal/
Qalo
33
-40:
be
droc
k
Bedr
ock
shal
e
shale
shal
e
shal
e
siltst
one
silt
ston
e
shale
siltst
one
shal
e &
sandst
one
shal
e
silt
ston
e &
clay
ston
e
silt
ston
e
Rema
rks
(dep
ths
in fe
et)
0-20
: 10%
cobb
les.
No ca
ving
. 20:
Water
seepage, 5/
7/67
.
Shal
e be
dded
. 4-35:
Rave
ling
. 32
-35:
Sl
ight
water seepage, 7
/4/6
9.
11-1
6: Caving an
d ra
veli
ng.
15:
Slight w
ater
seepage, 5/
7/67
.
6-8: 10%
cobbles.
19-2
9: Few
cobb
les.
50
, 55
: Ce
ment
ed l
ayer
. 6-7, 26
-28:
Ca
ving
an
d raveling.
28:
Wate
r seepage, 5/
6/67
.
Siltstone
massive.
14-26: Cobbles.
13-18, 20-26: Raveling.
26:
Wate
r seepage, 4/
9/74
.
Siltstone
frac
ture
d and massive.
6-13:
Cobbles.
6-12,
13-23: Ca
ving
. 24
: Water
seepage, 7/
9/65
.
Shal
e we
athe
red.
11
-17:
10%
cobb
les
and
a fe
w bo
ulde
rs.
4-16
: Ca
ving
. 15
: Slight w
ater seepage, 11
/16/
69
Below
42:
Bedr
ock
hard
. 62
: La
yer
of hard shale.
Shal
e and
sand
ston
e interbedded
with
av
erag
e strike a
nd d
ip o
f ENE, 45°.
0-5: So
me c
obbles.
Shal
e we
athe
red.
42-82: Siltstone.
Belo
1-,' 70
: Cla.vstona.
Siltstone massive.
12-3
0: 15%
cobbles.
30-3
3: 25
% co
bble
s an
d 10
% boulders
10-3
3: Ra
veli
ng.
28:
Water
seepage, 7/10/65.
Map
No.
2755 C
2755 D
2755 E
2755
F
2755 G
2756 A
2756 B
2756
C
2756 D
2756 E
2756 J
2756
K
2756 L
2756
M
2757
A
2759 A
2762 A
Oper
ator
-/
LAC IB
PC PC PC SOCAL
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
Caltrans
Designation
or P
urpose
foundation
foundation
foundation
foun
dati
on
Grayhound
CH 1
water
wate
r
wate
r
water
wate
r
wate
r
wate
r
wate
r
wate
r
wjct
^r
wate
r
foun
dati
on
Elev
. (feet)
270+
272+
266+
262
254
247+
247+
246+
240+
240+
242+
244+
233+
244+
223+
201+
404
Tota
l Depth
(feet)
50 38 50 40 6240
300
300
300
300
300
350
309
300
454
510
209
71
Geol
ogy-
' (d
epth
s in
feet)
0-50
: Qa
l/Qa
lo
0-20
: Qa
l/Qa
lo
20-3
8: be
droc
k
0-4:
af
4-50:
Qal/
Qalo
0-10
: af
10-4
0: Qa
l/Qa
lo
0-16
0: Qa
l/Qa
lo
160-
6240
: be
droc
k
0-15
7: Qa
l/Qa
lo
157-
300:
be
droc
k
0-15
7: Qa
l/Qa
lo
157-
300:
be
droc
k
0-15
6: Qa
l/Qa
lo
156-
300:
be
droc
k
0-18
1: Qa
l/Qa
lo
181-
300:
be
droc
k
0-18
3: Qa
l/Qa
lo
183-
300:
be
droc
k
0-18
5: Qa
l/Qa
lo
185-
350:
be
droc
k
0-140: Qa
l 14
0-15
0: Qalo?
150-
309:
be
droc
k
0-17
7: Qa
l/Qa
lo
177-
300:
be
droc
k
0-16
6: Qa
l/Qa
lo
166-
454:
be
droc
k
0-31
0: Qa
l/Qa
lo
0-20
9: Qa
l/Qa
lo
0-58:
Qal/
Qalo
58
-71
: be
droc
k
Bedr
ock
sand
ston
e &
shale
silt
ston
e,
shale, &
other
shale
shal
e
shale
shale
shal
e
shale
shal
e
shal
e
shal
e
shale
Rema
rks
(dep
ths
in fe
et)
0-9: Co
bble
s to 10 in
ches
.
15-2
0: Co
bble
s to
8
inch
es.
20-31
: Sandstone.
31-3
8: Sh
ale.
11
-20:
Raveling.
18-2
0: Water
seepage, 1/23/66.
7-25
: Sc
atte
red
cobb
les
to 15
in
ches
38
: Pe
trol
eum
odor.
0-39:
Raveling.
39:
Wate
r se
epag
e, 11
/20/
60.
10-4
0: 15
% co
bble
s and
a few
boulders.
29:
Petr
oleu
m od
or.
0-10
: Ca
ving
. 10
-32:
Mo
dera
te r
aveling.
32:
Water
seepage, 8
/20/66.
160-1400:
Siltstone
and
shal
e.
31-6
3, 91
-105
, 109-119: Bo
ulde
rs.
33-6
5, 95
-103
: Boulders.
39-71, 101-109: Bo
ulde
rs.
41-77, 85
-181
: Boulders.
41-7
3, 87
-115
: Boulders.
23-7
1, 104-117: Boulders.
23-7
1, 10
4-11
7: Boulders.
140-150: Red
horizon.
7-56
, 84
-100
: Boulders.
38-1
28:
Boulders.
160-188: Bo
ulde
rs.
17-3
3: Ca
rbon
ate
pock
ets
and
seams.
25:
Ground w
ater su
rfac
e, 5/31/61.
Map
N
o.
2763
A
2763
B
2763
C
2763
D
2763
E
2763
F
2763
G
2764
A
2764
B
2764
C
2764
D
2764
E
2764
F
2764
G
2764
H
2764
!
2764
J
Ope
ra to
r
Caltr
ans
Ca
ltra
ns
Caltr
ans
Ca
ltra
ns
Ca
ltra
ns
PC LACO
B
MTA
MTA
MTA
MTA
MTA MTA
MTA
LACO
B
LACO
B
PC
De
sig
na
tion
o
r P
urpo
se
foundatio
n
foundatio
n
foundatio
n
fou
nd
atio
n
foundatio
n
foundatio
n
foundatio
n
WC
-112
WC
-113
WC
-114
WC
-115
WC
-116
WC
-117
WC
-118
foundatio
n
fou
nd
atio
n
fou
nd
atio
n
Ele
v.
(feet)
358
340
341
348
330
321
288
307
296
278
275
271
281
282
289
234
284-
Tota
l D
epth
(f
ee
t)
71 100
62 50 51 35 75 83 66 54 52 66 67 68 150
75
21
Ge
olo
gy-
'
(de
pth
s in
fe
et)
0-5
9:
Qal/Q
alo
5
9-7
1:
be
dro
ck?
0-4
1:
Qa
l/Qa
lo
41-1
00:
bedr
ock?
0-3
7:
Qa
l/Qa
lo
37
-62
: b
ed
rock
?
0-3
8:
Qal/Q
alo
3
8-5
0:
be
dro
ck
0-4
8:
Qal/Q
alo
4
8-5
1:
be
dro
ck
0-3
: a
f 3-3
5:
Qa
l/Qa
lo
0-3
: af
3-7
5:
Qal/Q
alo
0-3
1:
Qa
l/Qa
lo
31
-83
: b
ed
rock
0-2
6:
Qa
l/Qa
lo
26
-66
: b
ed
rock
0-5
4:
Qal/Q
alo
0-4
6:
Qa
l/Qa
lo
0-6
6:
Qa
l/Qa
lo
0-6
6:
Qal/Q
alo
6
6-6
7:
be
dro
ck
0-5
0:
Qal/Q
alo
5
0-6
8:
be
dro
ck
0-1
2:
af
12
-97
: Q
al/Q
alo
97-1
50:
be
dro
ck
0-5
8:
Qa
l/Qa
lo
68
-75
: b
ed
rock
0-2
: a
f 2-2
1:
Qa
l/Qa
lo
Bed
rock
sandst
one
silts
tone
& sh
ale
san
dst
on
e
san
dst
on
e
silts
ton
e &
sh
ale
sha
le
& silts
tone
silts
ton
e
silts
tone
shale
sha
le
Rem
arks
(d
ep
ths
in fe
et)
0-2
1:
Carb
onate
se
ams.
5
9-7
1:
Oil
sand
.
Silt
sto
ne
and
sha
le
inte
rbe
dd
ed
30
: O
il.
52:
Pe
tro
life
rou
s
odor.
68-1
00:
Satu
rate
d o
il
sand
. 48
: W
ater
se
epag
e,
3/1
7/6
1.
3-1
7:
Carb
onate
se
ams.
3
7-6
2:D
en
se
san
dst
on
e.
No
wate
r.
48-5
1 :
Petr
ol ife
rou
s.
No w
ate
r.
26
-26
: C
obbl
es to
8
inch
es.
3
2-3
5:
Cob
bles
to
6
inch
es.
B
elow
20
: C
avi
ng
. N
o w
ate
r.
18
-22
: C
obbl
es
to
8 in
che
s.
Bed
rock
d
ips
50° -
60
°.
Bed
rock
d
ips
45°.
0-2
0:
Bould
ers
.
26
-35
: B
ould
ers
.
38
-48
: B
ou
lde
rs.
17
-97
: C
obble
s.
36:
Wat
er le
ve
l,
7/1
1/7
4.
17
-68
: C
obble
s,
bo
uld
ers
. 45
: "O
doro
us.
" 31
: W
ater
le
vel,
6/2
8/7
4.
05
: G
aseo
us
odor.
3-1
6:
Cavi
ng.
No
wate
r.
Map
No.
2764 K
2764
L
2764 M
2764 N
2764 P
2764 Q
2764 R
2765 A
2765 B
2765 B
2765
D
2765 E
2765 F
2766 A
2766 B
2766 C
Oper
ator
-'
PC PC PC PC PC PC Caltrans
TEXA
CO
SOCAL
SOCAL
DWP
ARCO
PC DWP
DWP
DWP
Desi
gnat
ion
or Pu
rpos
e
foundation
foundation
foundation
foundation
foundation
foundation
foun
dati
on
Texa
co-U
PRR
Unit
1-1
Garey
2 Ga
rey
2
wate
r
L.A. River
Fee
1
foundation
wate
r
water
water
Elev.
(feet)
290-
282
278
276
276
273
279
255
268
268
259-
254-
267
240-
240-
240^
Total
Depth
(fee
t)
75 65 60 70 75 75 20 7010
6886
6886
340
4618
36 300
300
300
Geol
ogy-
' (d
epth
s in
fe
et)
0-10
: af
10
-30:
Qa
l/Qa
lo
30-7
5: be
droc
k
0-17
: af
17-3
0: Qa
l/Qa
lo
30-6
5: be
droc
k
0-10:
af
10-47: Qa
l/Qa
lo
47-6
0: be
droc
k
0-5: af
5-55:
Qal/
Qalo
55
-70:
be
droc
k
0-7; af
7-38
: Qa
l/Qa
lo
38-7
5: be
droc
k
0-3: af
3-
47:
Qal/
Qalo
47
-75:
be
droc
k
0-11
: af
11-20: Qa
l/Qa
lo
0-125: Qa
l/Qa
lo
125-1850:
bedr
ock
0-<8
8: Qa
l/Qa
lo
< 88 -1
800:
be
droc
k
0-14
5?:
Qal/
Qalo
1457-340:
bedr
ock
30-7
5: Qal
75-1
45:
Qalo
145-1300:
bedr
ock
0-29
: Qa
l/Qa
lo
29-3
6: be
droc
k
0-18
5: Qa
l/Qa
lo
185-
300:
be
droc
k
0-18
7: Qa
l/Qa
lo
187-
300:
be
droc
k
0-18
8: Qa
l/Qa
lo
188-
300:
be
droc
k
Bedr
ock
shale
shal
e
shale
shal
e
shale
shale
shal
e
? si Its
tone
& sh
ale
shale
shal
e
shal
e
shale
Rema
rks
(dep
ths
in fe
et)
10-30: Occasional cobbles.
30-7
5: Shale
lami
nate
d.
05-0
9: Mi
nor
cavi
ng.
29:
Slight w
ater
seepage, 3/30/59.
64-6
5: Ve
ry ha
rd la
yer.
7-
12:
Heav
y ca
ving
. 16-18: Sliqht ca
ving
. 26:
Heavy
seepage, 3/16/59.
5-18
: He
avy
cavi
ng.
41-4
6: Mo
dera
te c
avin
g.
40-4
6: Wa
ter
seepage, 3/19/59.
Shale
laminated.
68-7
0: Very hard layer.
42-5
4: Heavy
cavi
ng.
42:
Heav
y wa
ter
seepage, 3/30/69.
No ca
ving
or w
ater.
3-47
: Occasional co
bble
s throughout
30-4
1: Many cobbles.
42-43: Slight c
avin
g.
42-4
7: Mo
dera
te seepage, 3/26/59.
11-19: Oily.
19-2
0: Cobbles.
10-6
0: bo
ulde
rs
21-2
3: Few
boul
ders
to 16
in
ches
. 16-26: Ca
ving
. 29
: Water
seepage, 3/
6/64
.
43-73, 89
-121
: Boulders.
41-7
1 , 93
-117
: Boulders.
42-73, 95
-119
: Boulders.
Map
No.
2766 D
2766
E
2766 F
2767 A
2767
B
2768 A
2769
A
2769
E
2769
G
2769
H
2769 L
2771
B
2771
D
2771 K
2771 M
2771
N
2771 P
2771 Q
2771
T
2772
A
2772
B-
l
Oper
ator
-'
DWP
BOGCO
SOCA
L
DWP
DWP
SOCA
L
DWP
DWP
DWP
DWP
DWP
Caltrans
Calt
rans
DWP
DWP
DWP
DWP
DWP
DWP
DWP
DWP
Designation
or P
urpose
wate
r
Signal-Std.
Exle
y EH
1
Sout
hern
Pa
cifi
c 57
-1
wate
r
wate
r
Blue
Di
amon
d 1
water
wate
r
wate
r
water
water
foundation
foundation
wate
r
water
wate
r
water
wate
r
wate
r
water
water
Elev.
(fee
t)
240-
250-
2431
225^
228-
223
205-
199-
1951
199-
199-
325
334
330^
300
310-
330-
345t
338t
340-
286
Tota
l Depth
(fee
t) 300
1005
8976
448
317
8930
874
918
1330
1200
1343
70 85 142
41+
60 104
71 58 118
78
Geol
ogy-
' (d
epth
s in
fe
et)
0-18
9: Qa
l/Qa
lo
189-
300:
be
droc
k
0-11
5: Qa
l/Qa
lo
115-
195:
Qsp
195-1005:
bedr
ock
0-16
0: Qal/Qalo/Qsp?
160-
8976
: be
droc
k
0-44
8: Qa
l/Qa
lo
0-31
7: Qa
l/Qa
lo
0-31
5: Qa
l/Qa
lo
315-
815:
Qsp
815-
8930
: be
droc
k
0-87
4: Qa
l/Qa
lo/Q
sp
0-91
8: Qal/Qalo/Qsp
0-13
30:
Qal/Qalo/Qsp
0-12
00:
Qal/Qalo/Qsp
0-13
43:
Qal/
Qalo
/Qsp
0-32:
af
32-7
0: Qa
l/Qa
lo
0-53:
af
53-8
6: Qa
l/Qa
lo
0-11
1: Qa
l/Qa
lo
111-
142:
be
droc
k
0-41
: Qa
l/Qa
lo
41+: be
droc
k
0-50:
Qal/
Qalo
50
-60:
be
droc
k
0-10
4: Qa
l/Qa
lo
0-71:
Qal/
Qalo
0-48
: Qal/Qalo?
48-5
8: be
droc
k?
0-80:
Qal/
Qalo
80
-118
: be
droc
k
0-33
: Qa
l/Qa
lo?
33-4
8: be
droc
k
Bedr
ock
Rema
rks
Type
(d
epth
s in fe
et)
shal
e 45
-75,
75
-114
: Boulders.
silt
s tone
silt
ston
e,
160-1900:
Siltstone
and
shal
e,
shale, &
ot
her
45-74: Boulders.
shale,
815-2700:
Shale
and
silt
ston
e.
siltston
e, &
other
18-90: Boulders.
sandston
e &
53-1
11:
Boul
ders
, sh
ale
111-
130:
Sandstone.
130-142: Sandstone
& shale.
shal
e
shal
e
sand
ston
e?
shal
e 38-50, 59
-74:
Boulders.
sand
ston
e &
33-56: Sa
ndst
one,
sh
ale
56-7
8: Shale.
Map
No.
2772
B-2
2772 C
2772
D
2772
E
2772
F
2772
G
2772
H
2772
I
2772
J
2772
K
2772
L
2772
M
2772
N
2772
P
2772 Q
2773
A
2773 B
2773
C
2773 D
2773 E
2773 F
Operator-'
Designation
or Pu
rpos
e
DWP
PC DWP
DWP
CE CE CE CE CE CE CE CE DWR
TEXA
CO
VOCO
DWP
DWP
DWP
CE CE CE
water
foundation
water
water
chan
nel
impr
ovem
ent
chan
nel
impr
ovem
ent
chan
nel
improvement
chan
nel
improvement
chan
nel
improvement
chan
nel
impr
ovem
ent
chan
nel
impr
ovem
ent
chan
nel
improvement
wate
r
So.
Paci
fic
CH
1
Frei
ght
Depo
t 1
water
wate
r
wate
r ch
anne
l improvement
chan
nel
impr
ovem
ent
chan
nel
improvement
Elev
. (feet)
284
320-
322
321
259
285-
282-
286
280-
279-
287
282
307-
340
320+
295+
-
295+
295+
272"
280
279
Tota
l De
pth
(fee
t)
78 45 111
55 30+
42±
24 30 30+
40±
37 39 125
5750
1898
340
495
82
61 42 38
Geol ogy-'
(dep
ths
in feet)
0-30
: Qa
l/Qa
lo30
-78:
be
droc
k
0-25:
af25
-45:
Qa
l/Qa
lo
0-10
5: Qa
l/Qa
lo10
5-11
1: be
droc
k
0-20:
af20
-35:
Qa
l/Qa
lo35
-55:
be
droc
k
0-26
: Qa
l/Qa
lo2£
-30:
be
droc
k
0-30:
Qal/
Qalo
20-3
7: be
droc
k
0-39:
Qal/
Qalo
0-75
: Qa
l/Qa
lo75
-125
: be
droc
k
0-33
5: Qa
l/Qa
lo33
5-57
50:
bedr
ock
0-<2
00:
Qal/
Qalo
<200:
bedr
ock
0-23
5: Qa
l/Qa
lo23
5-34
0: be
droc
k0-57:
Qal/
Qalo
57-4
95:
bedr
ock
0-82:
Qal/
Qalo
0-61:
Qal/
Qalo
0-42:
Qal/
Qalo
0-38
: Qa
l/Qa
lo
Bedr
ock
Rema
rks
Type
(dep
ths
in fe
et)
shal
e &
0-30
: Boulders.
sand
ston
e 30
-60:
Sh
ale.
60-6
6: Sandstone.
66-7
8: Sh
ale.
0-25:
20%
cobb
les
and
a 14
-inc
h boulder.
25-4
5: Cobbles.
34:
Petr
oleu
m odor.
4-45
: Ca
ving
.43:
Water
seepage, 7/23/66.
shal
e 3-16:
Cobbles.
105-106: Sh
ale.
106-111: Sandstone.
shale
& 31:
Water
enco
unte
red,
1/10/58
sandstone
No l
og;
derived
from s
truc
ture
No l
og;
derived
from s
tructure
No lo
g, derived
from s
tructure
shal
e 08
-26:
Bo
ulde
rs.
No lo
g; derived
from s
truc
ture
No l
og;
derived
from s
truc
ture
shal
e
? sand
ston
e,
335-
2550
: Sandstone
and
shal
e.shale, &
othe
r? shale
shale
43-57: Boulders.
20-3
0: Oil
and
some g
as.
33-60: Oi
l.
21-4
2: Oil.
36-3
8: Oi
l.
maps
.
maps.
maps.
maps.
maps.
Operator^-
Desi
gnat
ion
or P
urpose
CE
2773 H
2773
I
2773
J
2773
K
2773 L
2773 M
2774 A
2774 B
2774 C
2774
D
2774 E
2774 F
2774 G
2774 H
2774
!
2774 J
CE CE
CE CE DWR
PC SOCAL
CE
DWP
CE CE
DWP
CE
CE
MTA
PC
chan
nel
impr
ovem
ent
chan
nel
improvement
chan
nel
impr
ovem
ent
chan
nel
impr
ovem
ent
channel
improvement
wate
r
foundation
Miller C
H 1
channel
improvement
wate
r
channel
improvement
channel
impr
ovem
ent
wate
r
channel
improvement
channel
improvement
WC-121
foun
dati
on
Ele
v.
(feet)
278
281
280
275
265
282-
304
388
262
277+-
254
254
279
258
253
27,1
191
To
tal
Dep
th
(fe
et)
56 43 46 31 40 40 38 4535
40 131
31 32
100
36 26 7n 15
Geo
l og
y-'
(de
pth
s in
fe
et)
0-4
8:
Qa
l/Qa
lo
48
-56
: b
ed
rock
0-2
7:
Qa
l/Qa
lo
27
-43
: bedro
ck
0-4
3:
Qa
l/Qa
lo
46:
bedro
ck
0-2
5:
Qal/Q
alo
2
5-3
1:
bedro
ck
0-4
0:
Qal/Q
alo
0-4
0-:
Q
al/Q
alo
0-4
: a
f 4-3
8:
Qal/Q
alo
0-1
307:
Qa
l/Qa
lo
1307
-453
5:
be
dro
ck
0-4
0:
Qal/Q
alo
0-1
31
: Q
al/Q
alo
0-2
9:
Qal/Q
alo
29
-31
bedro
ck
0-1
7:
Qa
l/Qa
lo
17
-32
: b
ed
rock
0
-88
: Q
al/Q
alo
88-1
00:
bedro
ck
0-2
5:
Qal
/Qal
o 2
5-3
6:
bedro
ck
0-1
9:
Qal/Q
alo
1
9-2
6:
be
dro
ck
42
-70
: b
ed
rock
0-3
: fill
3-1
4:
Qal/Q
alo
1
4-1
5:
be
dro
ck
Bed
rock
sha
le
sha
le &
silts
tone
shale
shale
shale
, silts
ton
e.
san
dst
on
e,
oth
er
sha
le
sha
le
sha
le
silts
tone
sha
le
silts
tone
sha
le
Remarks
(depths
in f
eet)
0-27
: Oi
l.
23-46: Oil
streaks.
11-1
6: 5%
cobbles to
12 inches.
18-27:
Occa
sion
al co
bble
s.
30-34:
Stro
ng o
ily
odor
and
occasional co
bble
s.
35-38:
5% c
obbles to
10
inches.
4-6,
19
-38:
Caving.
37:
Wate
r se
epag
e, 1/
24/6
4.
1307-1835: Shale
with s
ilts
tone
.1835-2165: Si
ltst
one.
2165
-263
8: Si
ltst
one
with
sandstone.
2638
-280
0: Sa
ndst
one.
32-4
4, 66-67, 97-104:
Boul
ders
.
17-32: Shale
soft.
Siltstone
soft.
Shal
e medium s
oft.
Petroliferous
otor a
t bo
ttom
of
bed
rock
. 60°
dips in b
edro
ck.
3-14
: So
me c
obbl
es.
3-14
: He
avy
caving.
No w
ater
.
Map
No.
2774 K
2774 L
2774 M
2774
N
2774 P
2774
Q
2774
R
2774
S
2774 T
2774 U
2774
V
2774 W
2774 X
2774
Y
2774 Z
2774
AA
2774 BB
2775
A
Oper
ator
-'
MTA
DWR
MTA
CE
CE CE CE ,
Caltrans
Caltrans
CE Caltrans
Caltrans
Caltrans
Caltrans
Caltrans
MTA
MTS
SOCAL
Desi
gnat
ion
or Pu
rpos
e
WC-1
20
wate
r
WC-1
19
chan
nel
impr
ovem
ent
chan
nel
improvement
chan
nel
improvement
chan
nel
impr
ovem
ent
foundation
foundation
chan
nel
impr
ovem
ent
foun
dati
on
foundation
foundation
foun
dati
on
foun
dati
on
WC-122
WC-1
23
Depa
rtme
nt o
f Recreation
and
Parks
CH 2
Elev
. (f
eet)
279
282^
280
257
252
253
254
246
278
246
284
283
298
292
276
317
319
260
Tota
l Depth
(fee
t)
71 100
72 56
37 25 43 60 38
50 46 50 67 27
6 73 70 6054
Geol
ogy-
' (d
epth
s in fe
et)
0-50:
Qal/
Qalo
50-71
: be
droc
k
0-90
: Qa
l/Qa
lo
90-1
00:
bedr
ock
0-50
: Qa
l/Qa
lo
50-7
2: be
droc
k
0-45:
Qal/
Qalo
45
-56:
be
droc
k
0-37:
Qal/
Qalo
0-19
: Qa
l/Qa
lo
19-25: be
droc
k
0-37
: Qa
l/Qa
lo
37-43: be
droc
k
0-60
: Qa
l/Qa
lo
0-11
: af
11-48: Qa
l/Qa
lo
0-50
: Qa
l/Qa
lo
0-29:
af
29-4
4: Qa
l/Qa
lo
44-4
6: be
droc
k
0-40:
af /Qa
l/Qa
lo
40-5
0: be
droc
k
0-14
: af
14-44: Qa
l/Qa
lo
44-6
7: be
droc
k
0-27:
Qal/
Qalo
0-5: Qa
l/Qa
lo
5-6: be
droc
k
0-26:
Qal/
Qalo
26-73: be
droc
k
0-25:
Qal/
Qalo
25-70: be
droc
k
0-16
7: Qa
l/Qa
lo/Q
sp?
167-6054:
bedr
ock
Bedr
ock
siltstone
silt
ston
e?
siltstone
shale
shale
shale
Rema
rks
(dep
ths
in f
eet)
36-46: Bo
ulde
rs.
25°
dips
in
bedrock.
30:
Wate
r en
coun
tere
d, 3/
62.
30-31: Pe
trol
ifer
ous
odor,
oil
sand
. 50-72: Lo
ose
sand
ston
e at b
otto
m.
41-45: Co
bble
s.
33-45: Asphalt.
45-5
6: Shale, m
edium
soft w
ith
of o
il.
4-17:
Smal
l am
ount
of
heav
y oil
24-3
7: Impregnated
with oi
l.
16-1
9: Oil.
6-37:
Heav
y oil.
trac
e
3-4,
12,
35-40: Oi
l layers.
48-60: Cobbles
with "s
tick
y" oil.
31:
H?S
odor
. 12
: Gr
ound
wat
er s
urfa
ce,
3/8/55.
shal
e
shale
shal
e
shal
e
siltstone
siltstone
shal
e,
siltstone, &
ot
her
31-3
3: Oi
ly.
33-38: So
me c
obbl
es.
No w
ater.
No w
ater.
21-27: He
avy
oil.
0-27:
Cobb
les.
55-60° di
ps in b
edro
ck.
26,
36-40: Petroliferous
odor.
55:
Oil.
50°
dips
in
bedrock.
167-
1500
: Sh
ale
and
silt
ston
e.
Map
No.
2776 A
2776
B
2776 C
2777
J
2777
K
2777
L
2777
M
2778 J
2779
A&B
2779 C
2779 D
2779 M
2779 Y
2779 Z
2781 B
2782
A
2783 A
2783
B
2783 C
2784
A
2784
B
2784
C
Dp6r8 "COi"
DWP
DWP
ARCO
DWP
DWP
DWR
DWP
DWP
DWP
DWP
DWR
DWP
DWP
DWP
DWP
PC LACOB
DWP
LACOB
LACO
B
LACO
B
Caltrans
Designation
or P
urpose
water
water
LA R
iver C
otnm
. l-
l
water
wate
r
water
water
wate
r
wate
rwater
water
wate
r
wate
r
wate
r
wate
r
foun
dati
on
foundation
foundation
foundation
foundation
foun
dati
on
foundation
Elev.
(fee
t)
250+
245+
241+
250+
240+
227
250+
219+
198+
200+
203+
202+
204+
198+
345+
345+
323
305+
329
323
308
302
Tota
l Depth
(fee
t)
225
100
2924
672
686
400
710
1200
1250
201
1115
1075
1100
1246
105
40 100
76 50 59 48 50
Geol
ogy-
' Be
droc
k (d
epth
s in
fe
etl
Type
0-11:
af
?11
-82:
Qa
l/Qa
lo82
-225
: be
droc
k
0-50:
Qal/
Qalo
?
50-1
00:
bedr
ock
0-10
7: Qa
l/Qa
lo
shale,
107-2924:
bedr
ock
sand
ston
e,siltstone, &
other
0-67
2: Qal/Qalo/Qsp?
0-68
6: Qal/Qalo/Qsp?
0-400: Qal/Qalo/Qsp?
0-71
0: Qa
l/Qa
lo/Q
sp?
0-48:
af48
-120
0: Qal/Qalo/Qsp
0-12
50:
Qal/Qalo/Qsp
0-20
1: Qa
l/Qa
lo0-
1060
: Qa
l/Qa
lo/Q
sp
silt
ston
e &
1060-1115: be
droc
k shale
0-10
75:
Qal/
Qalo
/Qsp
0-11
00:
Qal/
Qalo
/Qsp
0-12
46:
Qal/
Qalo
/Qsp
0-10
5: Qalo
shal
e81
-105
: be
droc
k
0-40
: Qa
l/Qa
lo
0-100: Qa
lo
0-76:
Qal/
Qalo
0-9:
af
9-50
: Qa
lo
0-17
: af
17-5
9: Qalo
0-8: af
silt
ston
e8-
37:
Qalo
37-4
9: be
droc
k
0-50
: Qa
l/Qa
lo
Rema
rks
(dep
ths
in fe
et)
11-8
2: Boulders.
Bedrock: "b
lue
clay
."
Bedrock: "b
lue
clay
."
107-770: Shale.
770-1350:
Sand
ston
e and
silt
ston
e.
105-112, 128-175, 210-286: Cemented.
205-212: Boulders.
"Sha
le"
interlayers
mentioned.
No w
ater.
21:
Wate
r encountered, 4/
16/7
4
20-2
2: Co
bble
s to
6
inch
es.
23-2
6: Cobbles.
26-34: Few
cobbles.
27:
Water
encountered, 8/
20/7
5
37-5
0: Pe
trol
ifer
ous.
13:
Ground w
ater surface, 12/14/56.
2784 D
Caltrans
foun
dati
on29
445
0-40:
Qal/
Qalo
sh
ale
40-4
6: be
droc
kShale
firm.
11-2
0: Oi
l sa
nd.
28-45: Petroliferous.
6: Ground w
ater
surface,
1/31
/57.
Map
No.
2784 E
2784 F
2784
G
2784
H
2784
I
2784
J
2784
K
2784
L
2784 M
2784 N
2784 P
2784
Q
2784
R
2784 S
2784 T
2784 U
2784
V
2784 W
Oper
ator
-'
Caltrans
Calt
rans
Caltrans
Caltrans
Calt
rans
Caltrans
Calt
rans
Calt
rans
Caltrans
SOCAL
PC
PC PC PC PC Calt
rans
Caltrans
MTA
Desi
gnat
ion
or Pu
rpos
e
foun
dati
on
foundation
foundation
foundation
foun
dati
on
foun
dati
on
foundation
foundation
foun
dati
on
Seve
nth
Day
Adventist
Chur
ch
CH
1
foun
dati
on
foundation
foundation
foundation
foundation
foun
dati
on
foundation
WC- 124
Tota
l Elev.
Depth
(feet)
(fee
t)
294
39
310
324
311
332
300
323
339 334
340+
366
349
345
338
342
302
321
290
45 49 40 55 50 60 60 69 6398
12 47 40 40 40 45 80 31
Geol
ogy-'
(dep
ths
in fe
et)
0-32:
Qal/
Qalo
32
-39:
be
droc
k
0-45
: Qa
l/Qa
lo
0-49
: Qa
l/Qa
lo
0-17
: Qa
l/Qa
lo
17-4
0: be
droc
k
0-27:
Qal/
Qalo
27-55: bedrock?
0-35:
Qal/
Qalo
35
-50:
bedrock?
0-60:
Qal/
Qalo
0-60:
Qal/
Qalo
0-69
: Qt
0-<1
00:
Qt
<1 00-
6398
: be
droc
k
0-1:
af
1-
4: qt
4-12
: be
droc
k
0-3: af
3-45:
qt
45-4
7: be
droc
k
0-39:
qt
39-4
0: be
droc
k
0-37:
qt
37-4
0: be
droc
k
0-34
: qt
34
-40:
be
droc
k
0-27
: qa
l/qa
lo
27-45: be
droc
k?
0-80
: qa
lo
0-25:
qalo
25-31: be
droc
k
Bedr
ock
Rema
rks
Type
(d
epth
s in
fe
et)
shale
Shale
very de
nse.
5-25:
Petr
olif
erou
s.
29-4
5: Oil
satu
rate
d.
22:
Ground w
ater
surface,
11/9/56.
silt
ston
e Si
ltst
one
dens
e.
11:
Ground w
ater surface, 11
/9/5
6.
? Bedrock: "dense bl
ue-b
lack
org
anic
silt w
ith
thin sa
ndy
and
grav
elly
layers".
? Bedrock: "Compact to
de
nse
blue
si
lty
coarse sa
nd and
gravel."
35-4
0: Oil
satu
rate
d sa
nd.
46:
Ground w
ater
surface, 12/21/56.
55-60: Oil
bearing.
42-6
0: Petroleum, hydrocarbon
odor
. 40:
Ground w
ater surface, 1/10/57.
46-6
9: Petroliferous.
23:
Grou
nd w
ater
surface, 1/
7/57
.
? sand
ston
e &
1-4:
10
% co
bble
s an
d cemented,
shal
e 4-6: Sandstone.
6-12
: Shale.
No ca
ving
or
wat
er.
shal
e Shale
cemented.
30:
Ceme
nted
layer.
23-2
4: Sl
ough
ing.
23:
Wate
r seepage, 6/11/65.
shale
31:
Ceme
nted
la
yers
. 22-23: Sloughing.
22:
Water
seepage, 6/11/65.
shal
e No
ca
ving
or
wat
er.
shale
No c
avin
g.
13:
Water
seepage, 6/11/65.
? Bedrock: "dense bl
ue s
ilt
and
oil-
st
aine
d bl
ack
fine
sa
nd."
63-80: Cobble la
yers
.
silt
stone
Silt
ston
e dips 35°-60°.
2785 A
LACFCD
stor
m drain
333
160-
16:
qt
Map
No.
Operator-
Desi
gnat
ion
or Pu
rpos
e
2785 B
PC
foun
dati
on
2785 C
PC
foundation
2785 D
PC
2785 E
ARCO
2786
A
PC
2786 B
2786
C
2787 A
2787
B
2788 A
2788
B
2788 E
2788 G
2788 J
2789 A
2789 H
2789
I
2789 J
2793 A
2794
A
PC PC DWP
DWP
DWP
NPC
DWP
DWP
DWP
DWP
DWP
DWP
DWP
LACO
B
PC
foundation
Industrial Co
mm.
1-1
foun
dati
on
foun
dati
on
foundation
wate
r
wate
r
water
Vern
on 1
wate
r
wate
r
wate
r
wate
r
water
wate
r
wate
r
foun
dati
on
foun
dati
on
Ele
v.
(feet)
352
342
344
310
317
286
274
241
+
264+
199+
205+
209+
203+
203+
190+
192+
210+
199+
321
330+
Tota
l D
epth
(f
ee
t)
40 35 36 3351
95 39 10 765
511
401
6517
497
602
2445
489
572
926
1010
71 16
Geo
l og
y-'
(de
oth
s in
fe
et)
0-4
0:
bedro
ck
0-2
5:
Qt
25
-35
: b
ed
rock
0-4
: af
4-3
6:
be
dro
ck
0-<
100:
Qal
o <1
00
-33
51
: b
ed
rock
0-9
5:
Qal
o
0-7
: af
7-1
2:
Qal
o 1
2-3
9:
be
dro
ck
0-2
: af
2-3
: Q
al/Q
alo
3-1
0:
be
dro
ck
0-7
65
: Q
alo/
Qsp
0-4
65
: Q
alo/
Qsp
? 4
65
-51
1:
be
dro
ck
0-4
01
: Q
al/Q
alo
/Qsp
?
0-9
50
?:
Qal/Q
alo
/Qsp
9507-6
517:
be
dro
ck
0-4
97
: Q
al/Q
alo
/Qsp
?
0-6
02
: Q
al/Q
alo
/Qsp
?
0-1
27
0?
: Q
al/Q
alo
/Qsp
1270?-2
445:
be
dro
ck
0-4
89
: Q
al/Q
alo
/Qsp
?
0-5
72
: Q
al/q
alo
/Qsp
?
0-9
26
: Q
al/Q
alo
/Qsp
0-1
010:
Qal/Q
alo
/Qsp
0-5
8:
Qa
l/Qa
lo
58
-71
: bedro
ck
0-1
3:
af/
Qa
lo
13
-18
: b
ed
rock
Bed
rock
sha
le
sha
le
shale
silts
ton
e
* sh
ale
shale
sha
le
sha
le
silts
ton
e,
sh
ale
, &
oth
er
? sandst
one,
silts
ton
e,
sha
le
clays
tone
i sa
ndst
one
Rema
rks
(dep
ths
in fe
et)
No caving or
wat
er.
Shale
weat
here
d.No
ca
ving
.26
: Slight w
ater
seepage, 8/
23/7
1.
No
cavi
ng
.34
: S
ligh
t w
ate
r se
epag
e,
8/2
4/7
1.
18
-20
: 5%
co
bble
s.4
5-5
0:
10%
co
bb
les.
No
cavi
ng
.61
: S
ligh
t w
ate
r se
epag
e,
12
/19
/55
.
Sha
le
we
ath
ere
d
and
fractu
red.
7-1
2:
Co
bb
les.
No
cavi
ng
.22
: S
ligh
t w
ate
r se
epag
e,
7/5
/67.
Sha
le w
ea
the
red
an
d fr
actu
red
. No
ca
ving
or
wate
r.
9507
-255
0:
Silt
sto
ne
an
d sh
ale
.
Sa
nd
sto
ne
, silts
tone,
and
sha
lein
terb
edded.
23:
Wat
er
seep
age,
4/8
/74.
& No
ca
ving
or
wat
er.
Total
21
Elev
. De
pth
Geol
ogy-
' Bedrock
Remarks
Total
I/
/ICV
'\
Dept
h ue
uiuy
y
oeurucK
KemarKS
Oper
ator
-7
Designation
or P
urpose
ifee
t)
(fee
t)
(depths
in fe
et)
Type
(depths
in f
eet)
LACF
CD
foundation
335
21
0-21:
Qt
No c
avin
g or w
ater
.
PC
foun
dati
on
285
28
0-17:
af
shale
Shale weathered
and
fractured.
17-22: Qal/Qalo
4-9: Ra
veli
ng.
22-28: be
droc
k No
water.
2796 B
PC
fo
unda
tion
284
39
0-22
: af
sh
ale
& 28-36: Shale
weathered
and
fractured.
22-28: Qa
l/Qa
lo
siltst
one
36-39: Si
ltst
one weathered
and
28-39: be
droc
k fractured.
No ca
ving
or
wate
r.
2796
C
PC
foundation
265
18
0-10:
af
shal
e Sh
ale weathered
and
fractured.
10-13: Qal/Qalo
10-13: Ra
veli
ng.
13-18: be
droc
k 13:
Wate
r se
epag
e, 7/5/67.
2798 J
DWP
water
185+
811
0-811: Qal/Qalo/Qsp
1/ARCO:
Atlantic Ri
chfi
eld
Company
BOGCO: Bu
rmak
Oil
and
Gas
Company
Calt
rans
: California D
epartment
of T
ransportation
CE:
U.S. Army C
orps
of
Engi
neer
s DW
P: Los
Ange
les
City D
epartment
Water
and
Powe
r DW
R: Ca
lifo
rnia
Dep
artm
ent
Wate
r Re
sour
ces
Hosp
: Ho
spit
alLACFCD:
Los
Ange
les
Coun
ty Flood
Control
District
LACIB: Los
Angeles
City
pub
lic
buil
ding
LA
COB:
Lo
s Angeles
Coun
ty p
ubli
c building
MTA:
Metropolitan T
rans
it A
uthority (of
1962
) NPC: Neaves Pe
trol
eum
Company
PC:
Private
consultant o
r contractor
SBOC
: Se
aboa
rd O
il Co
mpan
y SOCAL: St
anda
rd O
il Co
mpan
y of C
alifornia
TEXACO:
Texaco,
Incorporated
VOCO:
Vent
ura
Oil
Comp
any
WS:
Willia
m Su
lliv
an
WSP
139:
U.S. Ge
olog
ical
Survey W
ater
Supply
Paper
193
21 -'af
: Ar
tifi
cial
fill and
colluvium
Qal:
Al
luvi
umQa
lo:
Old
alluvium
Qsp: San
Pedro
Formation
(Thomas
and
others,
1961)
TABLE 2. COMBINED TERZAGHI ROCK AND SOFT-GROUND TUNNEL CONDITIONS
(After Proctor, 1971; condition 10 from Brandt and others, 1970)
1 - Hard and intact.2 - Hard stratified or schistose.3 - Massive, moderately jointed; very firm ground.4 - Moderately blocky and seamy; firm ground, may ravel
when below water table.5 - Very blocky and seamy (closely jointed); may ravel
when below water table.6 - Crushed but chemically intact rock or unconsolidated
sand; may run or flow below water table.7 - Squeezing rock, moderate depth.8 - Squeezing rock, great depth.9 - Swelling rock.
10 - Bouldery ground.
Notes: In practice, there are no sharp boundaries between these categories, and a range of several numbers may best describe some conditions.
Definitions of terms
Blocky and seamy rook (Rock Condition Nos. 4 and 5). Refers to almost intact rock in which separated blocks or fragments are imperfectly interlocked. Tunnel walls usually require support. "Seamy" is a tunnel man's term and may be described as: irregular schistose layers in crystalline rock: shale or clay layers commonly interbedded in sandstone or limestone^ and also any rock with numerous clay-filled joints and fractures. More specifically: Moderately blooky and seamy joints or bedding plane partings are two to six feet apart. Overbreak is generally small. Walls do not require lateral support. Ribs may be set on two- to four-foot centers, if extensive lag ging is used. Rock "stands moderately well." Very blooky and seamy (olosely jointed) extensively jointed and fractured rock (partings at one-inch to two-foot intervals), or poorly cemented strata; overbreak common. Joints are open or weakly cemented, and several joint sets are obvious. Includes frac tured rock, but not crushed or brecciated as in a shear zone. Rock "stands poorly." Groundwater may be very troublesome. Spiling may be required for driving stability, and the walls of the tunnel must be lagged.
Bouldery ground (Rock Condition No. 10). Applies in some degree to most surficial deposits in Los Angeles area, specifically to alluvium, old alluvium, and terrace deposits. Probably the most severe tunneling condi tion represented because of difficulty in handling large numbers of boulders without severely reducing the rate of advance; blasting or hand-mining ahead of machine possibly necessary (Brandt and others, 1970, p. 12, 47, 57).
Crushed but ohemioally inta&t rook or unaonsolidated sand (Rock Condition No. 6). Brecciated (shattered) fault zone material, often containing fault gouge. If most of the crushed fragments are the size of sand grains, or the material is unconsolidated or weakly cemented sand, these materials below the water table may become running or flowing ground. Side pressures become significant.In normally unlined tunnels, lining is usually required where Rock Condition No. 6 is encountered.
Firm ground (Rock Condition Nos. 3 and 4). Firm ground refers to consolidated sediments or soft sedimentary rock in which the tunnel heading can be advanced without any, or with only minimal, roof support, and the permanent lining can be constructed before the ground begins to move or ravel. Firm ground is the ideal boring machine material. Below the water table firm.ground may become running or flowing ground. Firm ground results from cementation, consolidation, or compaction of sediment. Material has a dull sound when struck with a hammer. Typical representatives of firm ground are cohesive sand and loess above the water table, and various clays with low plasticity,
sucli as kaolin and marl (calcareous clay).Flowing ground (Rock Condition No. 6). Flowing
ground moves like a viscous liquid. It occurs only below the water table in a saturated mate rial, particularly under artesian pressure. In contrast to running ground, it can invade the tunnel not only through the roof, sides, and face, but also up from the floor. If the flow is not stopped, it will continue until the tun nel is filled. A sudden rush of flowing ground into a tunnel is known as a "blow" or a "boil." Dewatered flowing ground usually becones firm ground.
Hard and intact rook (Rock Condition No. 1). Mas sive rock containing no significant joints; when fractured by blasting, it breaks across sound rock, as in tombstone-quality granite. Rock rings when struck with hammer. Bit wear is high. Tunnel supports are not required. Spall- ing and popping may occur. ("Soft intact" rock is more aptly termed firm ground).
Hard stratified or schistose rook (Rock ConditionNo. 2). Consists of indurated or cemented lay ers or strata. Slaty cleavage belongs in this category. However, stratified or schistose rock can range from complete resistance to no resis tance against separation along beddinp or foli ation planes, and thus includes all rock condi tions except No. 1. Stratified rock nay have abundant bedding-plane slickensides urrelated to faults. Joint planes commonly occrr normal to the bedding or schistosity. If the strata are more than six feet thick, the rock may be termed massive and belong in Rock Condition No. 3.
Jointed rock contains fractures or cracks. True jointing exhibits more or less systematic orientation of inherent cracks in a rock mass; fractured rock consists of broken rock in which randomly oriented cracks result either from blasting or faulting.
Massive rock (Rock Condition No. 3). Rocl is near ly intact; joints and hair cracks are at spac- ings of six feet or greater. Large cracks and other rock defects may be naturally cemented to yield a massive rock. Bedding planes are not significant. If overbreak occurs, it is usually a result of poor blasting techniques rather than rock condition. Support ribs may be set on six- foot centers with very little or no lagging, or light roof bolting. Rock "stands well."
Popping rock (rock burst) a rock conditior involving the spontaneous and violent detachment of rock slabs. It is caused by sudden stress release in the rock. Occurs commonly in hard intact rock to moderately jointed rock at great depth.
Raveling ground (Rock Condition No. 5). Foorly con solidated or cemented materials that can stand up for several minutes to several hours at a fresh cut, but then start to slough, slake, or scale off. Slightly cohesive sand is assigned to this category. Raveling ground may become running or flowing ground below the water table.
Running ground (Rock Condition No. 6). Material of no cohesion, such as clean sand or grrvel, is referred to as running ground regardless of whether it is located above or below the water table. Stand-up time is nearly zero. Tunneling usually is uneconomical below the water table without prior dewatering or grouting. Running ground above the water table will stalilize on a slope of 30 to 40 degrees; the grair size, shape, driving force of water pressures, and moisture content govern the angle of repose. Breastboards or other means of securing the heading are required for advance.
64
Squeezing rook (Rock Conditions Nos. 7 and 8). Slow movement of rock into the tunnel without percep tible volume increase. All tunnels in soft clay experience squeeze. The difference between Terzaghi category 7, moderate depth, and 8, great depth, is arbitrary depending on rock types and conditions in a given tunnel; assume 1,000 feet of cover as the dividing line between mod erate and great depth. Rock pressure expressed by squeeze can occur in a tunnel in three ways, including (1) chemically induced squeeze. (2) Meetwmical squeeze (gravity): This occurs where rock is adversely jointed or fractured and loosened by overblasting, or where a shallow or weakly consolidated overburden inhibits develop ment of a normal ground-arch above the crown. Gravity then can act on the blocks of rock to load and deform the support system. If ribs are the main type of support, back-packing and wedg ing behind ribs to maintain interlocking of rock fragments are essential in preventing or retarding this type of squeeze. (3) Tectonic squeeze ("mountain pressure"): Latent stresses within a rock mass, which usually increase with depth of cover. The tunnel provides a cavity for relief of stresses, and the rock often de forms plastically. Some minerals also expand elastically when confining pressure is relieved. Pressures as high as 20 tons per square foot have been recorded.
Stand-up time the time that elapses between the ex posure of an area at the roof of a tunnel and the beginning of noticeable movements of the ground above this area. For example, the stand- up time of raveling ground may be several minu tes, or long enough to install temporary sup ports, but the stand-up time of flowing ground is zero. Tunnel size is an important factor.
Swelling rook (Rock Condition No. 9). Expands in volume upon exposure to water. (Swelling is a particular type of squeezing ground.) Excava tion may require blasting or the rock may be soft enough to require shield methods. Usually limited to those rocks that contain minerals with an expanding-lattice molecular structure: examples are montmorillonite clay (commonly volcanic ash altered to bentonitic tuff), and serpentinite; sedimentary formations containing anhydrite may hydrate to gypsum with great pres sures and volume increase. True swelling in clays is totally reversible only with complete dehydration. Invert struts, circular ribs, or yielding ribs are required for support in swell ing ground.
TABLE 3. STANDARD PENETRATION TEST-'
Relative Density of sand
Penetration resistance, N
(blows/ft)
0-4
4-10
10-30
30-50
>50
Relative density
Very loose
Loose
Medium
Dense
Very dense
Strength of Clay
Penetration resistance, N (blows/ft)
<2
2-4
4-8
8-15
15-30
>30
Unconfined compressive strength (tons/ft 2 )
<0.25
0.25-0.50
0.50-1.00
1.00-2.00
2.00-4.00
>4.00
Consistency
Very soft
Soft
Medium
Stiff
Very stiff
Hard
-Terzaghi and Peck, 1967, p. 341,347.
65
Append
ix 1. Recently-excavated Lo
s An
gele
s-ar
ea tunnel
s
' [D
ata
prov
ided
by R.
J.
Proctor, 19
77]
Owner
and
Tunnel Name
Los
Angeles
County
Flood
Cont
rol
Dist.
Storm
Drain
#1102
(2 sh
ort
segments:
Hoov
er St.,
Sacatella)
Metr
opol
itan
Wate
r Dist.
Tonner 1
and
2
Loca
tion
Los
Angeles
(downtown)
Near Yor
ba
Linda,
Oran
ge Co.
Los
Ange
les,
Coun
ty Fl
ood
Redondo
Cont
rol
Dist
. Storm
Beac
h,Drain
#110
5 To
rran
ce
Metr
opol
itan
Water
Dist.
San
Fernando
Sylmar area
Paci
fic
Tele
phon
e Co.,
Olive
Stre
et
Metrop
olit
an Wat
er Di
st,
Balboa Ou
tlet
Los
Angeles
(dow
ntow
n)
Sylmar
Mate
rial
, Le
ngth
Di
amet
er
Geologic unit
0.6 mi
2 mi
5.5 mi
750
ft
0.7
mi
17 ft
22 ft
7 ft
16 ft
Sandstone,
shal
e,
Puen
te Fm.
3.4 mi
11 ft
Sand
ston
e an
dsh
ale,
Pu
ente
Fm.
13 ft
, Du
ne sand,
7 ft
damp
Sand
ston
e,
silt
ston
e,
boul
ders
;Sa
ugus
Fm
.,
allu
vium
Siltstone,
Puen
te Fm.
Sand
ston
e,
siltstone;
Saug
us Fm
.,
Sunshine
Ranch
Fm.
Year
be
gun,
method,
comm
ents
1975.
Gradall
in a
shie
ld.
Prior
dewa
teri
ng
requ
ired
by
specs.
Gas
and
seeping
oil
encoun
tered
in Los
Ange
les
City oil
fiel
d,
but
controlled by
st
rong
ventilation.
1972
. Ma
inly
rotary-head
mole.
Dela
y in
To
nner
No.
1 due
to ha
rd sandstone, but
rate
in
longer Tonner No.
2 av
g. 60 ft
/day
; severa
l da
ys of
over 100
ft/d
ay.
1972
. Ai
r sp
ade,
ru
bber
-tir
ed m
ucker.
Sand
stoo
d well during in
stal
lati
on of
st
eel
ribs
.
1969
. Di
gger
-typ
e mo
le.
Dry
old
alluvium
stoo
d we
ll;
wet
old
alluvium ca
ved,
requir
ed dewa
teri
ng fr
om within tunnel.
Progress
up to 277
ft/d
ay (world record), in
clud
ing
prec
ast
segment
supports.
Mole ha
ndle
d boulde
rs in old
alluvium a
nd Saugus.
1969
. Ro
tary-head
mole
, proble
ms encountered.
Siltstone
damp;
no
1968.
Rotary-head
mole
; conditions mostly
dry
to dripping;
rate
s up to
111
ft/day,
but
avg.
30 ft
/day
, due
in part to sh
ort
tunn
el length and
adju
stme
nts
to new
mole.
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67
.S. Government Printing Office: 1977 240-961/95