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DESCRIPTION OF PIEZOMETER NESTS AND WATER LEVELS
IN THE RIO ORANDE VALLEyNEAR ALBUQUERQUE,
BERNALtLLO COUNTy, NEW MEXICO
By Scott K. Anderholm and Thomas F. Bullard
U.S. GEOLOGICAL SURVEY Open-File Report 87-122
Prepared in cooperation with the
NEW MEXICO ENVIRONMENTAL IMPROVEMENT DIVISION
Albuquerque, New Mexico
1987
DEPARTMENT OF THE INTERIOR
DONALD PAUL HODEL, Secretary
U.S. GEOLOGICAL SURVEY
Dallas L. Peck, Director
For additional information Copies of this report canwrite to: be purchased from:
District ChiefU.S. Geological Survey U.S. Geological SurveyWater Resources Division Books and Open-File Reports Sectionpinetree Office Park Federal Center4501 Indian School Rd. NE, Suite 200 Box 25425Albuquerque, New Mexico 87110 Denver, Colorado 80225
CONTENTS
PageAbstract ............................................................. 1
Introduction.......................................................... 2
Purpose and scope ............................................... 2Acknowledgments ................................................. 2Drilling method and well construction ........................... 4Well development ................................................ 4
Description of piezometer nests ...................................... 6
Rio Bravo 1 ..................................................... 6Rio Bravo 2 ..................................................... 12Rio Bravo 3 ..................................................... 16Rio Bravo 4 ..................................................... 21MontaTio 1 ....................................................... 25Montano 2 ....................................................... 31Montano 3 ....................................................... 35Montano 4 ....................................................... 40
Water-level data ..................................................... 44
References ........................................................... 51
FIGURES
Figure 1. Map showing the location of the piezometer nests inthe Rio Grande valley near Albuquerque ................. 3
2. Schematic of piezometer construction. ..................... 5
3. Diagram of configuration of piezometers in the RioBravo 1 and Rio Bravo 2 piezometer nests ............... 9
4. Driller's log of the deepest borehole in the Rio Bravo1 piezometer nest ...................................... 10
5. Geophysical logs of the deepest borehole in theRio Bravo 1 piezometer nest ............................ 11
6. Driller's log of the deepest borehole in the Rio Bravo2 piezometer nest ...................................... 14
7. Geophysical logs of the deepest borehole in the RioBravo 2 piezometer nest ................................ 15
111
FIGURES - Continued
Page Figure 8. Diagram of configuration of piezometers in the
Rio Bravo 3 and Rio Bravo 4 piezometer nests ........... 18
9. Driller's log of the deepest borehole in the RioBravo 3 piezometer nest ................................ 19
10. Geophysical logs of the deepest borehole in theRio Bravo 3 piezometer nest ............................ 20
11. Driller's log of the deepest borehole in the RioBravo 4 piezometer nest ................................ 23
12. Geophysical logs of the deepest borehole in theRio Bravo 4 piezometer nest ............................ 24
13. Diagram of configuration of piezometers in theMontano 1 and Monta'no 2 piezometer nests ............... 28
14. Driller's log of the deepest borehole in theMontarfo 1 piezometer nest .............................. 29
15. Geophysical logs of the deepest borehole in theMonta'no 1 piezometer nest .............................. 30
16. Driller's log of the deepest borehole in theMontano 2 piezometer nest .............................. 33
17. Geophysical logs of the deepest borehole in theMonta'no 2 piezometer nest .............................. 34
18. Diagram of configuration of piezometers in theMonta'no 3 and Montano 4 piezometer nests ............... 37
19. Driller's log of the deepest borehole in theMontano 3 piezometer nest .............................. 38
20. Geophysical logs of the intermediate-depth boreholein the Montano 3 piezometer nest ....................... 39
21. Driller's log of the deepest borehole in theMontano 4 piezometer nest .............................. 42
22. Geophysical logs of the deepest borehole in theMontanb 4 piezometer nest .............................. 43
IV
FIGURES - Concluded
Figures 23-26. Water-level hydrographs of the:Page
23. Rio Bravo 1 and Rio Bravo 2 piezometernests ........................................... 45
24. Rio Bravo 3 and Rio Bravo 4 piezometernests ........................................... 46
25. Montario 1 and Montano 2 piezometer nests .......... 47
f\s
CONVERSION FACTORS
For the convenience of readers who prefer to use the International System of units (SI), conversion factors for terms used in this report are listed below:
Multiply inch-pound unit
inch foot mile
By
25.400.30481.609
To obtain SI unit
millimetermeterkilometer
Use of brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey.
Sea level; In this report, "sea level" refers to the National Geodetic Vertical Datum of 1929 (NGVD of 1929) a geodetic datum derived from a general adjustment of the first-order level nets of both the United States and Canada, formerly called "Mean Sea Level of 1929."
VI
DESCRIPTION OF PIEZOMETER NESTS AND WATER LEVELS
IN THE RIO GRANDE VALLEY NEAR ALBUQUERQUE,
BERNALILLO COUNTY, NEW MEXICO
By Scott K. Anderholm and Thomas F. Bullard
ABSTRACT
Ground-water contamination in the Rio Grande valley near Albuquerque has been recognized by several authors, but prediction of the movement and fate of contamination has not been evaluated because of the poor understanding of the shallow ground-water flow system. Twenty-four piezometers were installed from mid-October 1984 to mid-January 1985 in two sections of the Rio Grande valley near Albuquerque. Each section is comprised of four piezometer nests and each nest is comprised of three piezometers completed at different depths. This report describes the piezometer nests and presents water-level data collected from the piezometers.
The piezometers were drilled using the hydraulic rotary method. Driller's logs, geophysical logs, and descriptions of well cuttings were made of a borehole at each piezometer nest. The piezometers were completed with 5 feet of 60-slot wire-wound stainless-steel well screen and flush-joint polyvinyl chloride well casing. Description of each piezometer nest consists of location; a figure showing the location, depth, altitude, and station- identification numbers of piezometers in each nest; and a driller's log, geophysical logs, and description of the well cuttings from a borehole in each piezometer nest.
Water levels were measured in each piezometer weekly from February through June 1985. During that period, water levels generally rose in the piezometers in the Rio Bravo Boulevard section but not in the Montano Road section. Water-level altitudes in piezometers completed at different depths in a particular nest are about the same in all of the Rio Bravo Boulevard nests and in the Montano 1 nest. In several of the piezometer nests, water- level altitudes decrease with depth, especially in the Montano nests.
INTRODUCTION
Purpose and Scope
Ground-water contamination in the Rio Grande valley near Albuquerque has been described by several authors (Hines, 1981; McQuillan, 1982), but prediction of the movement and fate of contamination has not been evaluated because of the poor understanding of the shallow ground-water flow system. Two sections comprised of four piezometer nests per section and three piezometers per nest were installed in the Rio Grande valley near Albuquerque to collect water-level data. These data may be used to investigate the interaction of the surface-water system with the shallow ground-water flow system.
The purpose of this report is to describe the piezometer nests and present water-level data that were collected from the piezometers. This includes a description of the location and depth of each piezometer; driller's logs, geophysical logs, and descriptions of well cuttings from a borehole at each piezometer nest; and water levels measured in each piezometer.
The two sections are along Montano Road and Rio Bravo Boulevard (fig. 1). The sections are approximately perpendicular to the Rio Grande. The piezometer nests are on right-of-way land of the New Mexico State Highway Department; Bernalillo County; City of Albuquerque; or the Middle Rio Grande Conservancy District.
Acknowledgment s
Paul Meyers of the New Mexico State Highway Department; Becky Sandoval, Thomas Shafer, and Russell Givler of the City of Albuquerque; Manuel Chavez of the Middle Rio Grande Conservancy District; and David Ridgley of Bernalillo County were helpful in obtaining permission to drill piezometers on right-of- way land.
1
012345 KILOMETERS
Figure 1.--Location of the piezometer nests in the Rio Grande valley
near Albuquerque.
3
Drilling Method and Well Construction
The boreholes were drilled from mid-October 1984 to mid-January 1985 using the hydraulic rotary method. A 12.75-inch-diameter borehole was drilled for each piezometer. Samples of the material drilled were collected at 5-foot intervals during drilling of a borehole (generally the first borehole drilled) at each nest. The driller kept a log of his description of the materials drilled and the drilling rate. Geophysical logs were run on this borehole prior to installation of well casing. Geophysical logs and the driller's log were used to select permeable zones for the screened interval of the other piezometers in each nest. Red Devil drilling mud was used in the drilling of the boreholes; however, in several boreholes, drilling through clay beds resulted in thickened drilling fluids, so drilling mud was not needed after penetrating these clay beds. After reaching the total depth of each borehole, drilling fluids were circulated in the borehole and the viscosity of the drilling fluids was adjusted (generally the mud was thinned with water) to facilitate placement of the gravel pack. After the viscosity was adjusted and the borehole was logged, if necessary, the well casing and screens were installed. The well casing was 5-inch-diameter, schedule-80 flush-joint (threaded) PVC pipe. Glues or solvents were not used during installation of the casing and screens. Five feet of blank casing capped at the bottom (flush-tube extension) was installed below 5 feet of 60-slot, opening width 0.060 inch, wire-wound stainless-steel screen (fig. 2). This 5 feet of blank well casing was installed to trap sediment that passes through the gravel pack and well screen and into the well bore, thus preventing or delaying the plugging of the well screens by this material. After the casing and screens were set, the gravel pack, consisting of 1/2-inch-diameter washed rock, was emplaced in the annulus between the borehole and the casing using a tremie pipe to a level approximately 1 foot above the top of the well screen (fig. 2). Approximately 3 feet of silica sand or washed masonry sand was placed on top of the gravel pack using a tremie pipe. To prevent leakage of water along the annulus, at least 5 feet of cement grout was emplaced above the sand also using a tremie pipe. The rest of the annulus was backfilled to within 3 feet of land surface using heavy mud and fine-grained drill cuttings. A cement seal was placed at land surface to anchor the casing and seal the annulus from surface water (fig. 2). Centering devices were not used on the well casing to ensure an even gravel pack around the well screen.
Well Development
The piezometers were developed to remove drilling mud and fine-grained material in the aquifer adjacent to the screened interval. After the cement grout seals had cured, each piezometer was developed using an air compressor on the drill rig. Drill-stem or 1-inch-diameter PVC pipe was lowered to the bottom of the borehole and air was pumped down the drill stem or pipe. Specific conductance and amount of sediment in the produced water were monitored during development. Development was assumed to be completed when the specific conductance and amount of sediment in the water did not change. In several cases, water from the wells contained fine sand that possibly entered the well screen because of the lack of centering devices.
CEMENT GROUT
SURFACE SEAL
WIRE-WOUND STAINLESS-
STEEL SCREEN, 60-SLOT
S FEET
FLUSH-TUBE EXTENSION
S FEET
'///A V//
^
i^S$i%
:j§;i|:;:
I'M-
I*I*I*I
LAND SURFACE
CEMENT GROUT SEAL
5 FEET MINIMUM
FINE SAND
3 FEET
GRAVEL PACK
I I FEET
FEET
S ~
4 -
3 -
2 -
1 -
O 1 | | 1 1 1 1 1 1 1
0 2 4 6 8 10 INCHES
Figure 2.--Schematic of piezometer construction,
DESCRIPTION OF PIEZOMETER NESTS
The description of each piezometer nest consists of its location; a figure showing the location, depth, altitude, and station-identification number of piezometers in each nest; and a driller's log, geophysical logs, and description of the well cuttings from a borehole in each piezometer nest. The measuring-point altitude is the reference altitude from which depth to water is measured; the measuring point is the high point of the well casing and is within 1 foot of land surface. Altitudes were determined by surveying from bench marks to the measuring points. The station-identification number of each piezometer consists of the six-digit latitude, seven-digit longitude, and a two-digit sequence number. The deepest piezometer in each nest has been assigned a sequence number of 01, the mid-depth piezometer 02, and the shallowest piezometer 03.
Lithologic logs were prepared from well-cutting samples collected at 5- foot intervals of a borehole in each piezometer nest. Descriptions of well cuttings were made in the office using a 14 X magnification binocular microscope. The following properties were determined and evaluated for each borehole: (1) Dry and moist colors, (2) grain size, (3) roundness and sorting of grains, (4) distinction of rock fragment types, (5) presence of clay film and colloidal stains, and (6) reaction to 10 percent hydrochloric acid. Dry and moist colors were determined with a standard rock color chart (National Research Council, 1948). Grain-size estimates were made using grain-size images and scales. Roundness and sorting of samples were evaluated visually, using roundness and sorting images (Krumbein and Sloss, 1956; Folk, 1974). Distinction of rock fragment types was based on textural characteristics and mineralogical constituents for individual rock fragments as viewed under 14 X magnification. Reaction of 10 percent hydrochloric acid indicates the presence or absence of calcium carbonate. The degree of effervescence is based on a relative scale as described by Birkeland (1974).
Rio Bravo 1
The Rio Bravo 1 piezometer nest (fig. 1) is on the east side of the Pajarito Lateral south of Rio Bravo Boulevard (latitude 35°01'37", longitude 106°41'05"). The piezometers are oriented approximately north-south and the deepest piezometer (148.5 feet) is the southern piezometer in the nest (fig. 3). The distance between the southern and middle piezometers is 14.3 feet and the distance between the middle and northern piezometers is 21.0 feet. The driller's log is shown in figure 4 and the geophysical logs are shown in figure 5. The description of well cuttings is in table 1.
Tablei. Lithologic description of well cuttings from the deepest borehole in the Rio Bravo 1 piezometer nest
[d, dry; m, moist; mm, millimeters; CaCOo, calcite; HCl, 10 percent hydrochloric acid]
RIO BRAVO 1
Lithology
Depth intervalbelow land surface
(feet)
Silty sand; pale-yellowish-brown (10YR 6/2 d), fine- 0-15 to very coarse grained sand; subangular to rounded, poorly to moderately sorted; composed dominantly of rose, milky, and yellow quartz and black quartzite with lesser amounts of feldspar, volcaniclastic, sandstone, basalt, and gneissic and granitic crystalline rock fragments; very thin, discontinuous iron-oxide stains and clay films on some grains; very weak effervescence to HCl.
Gravelly sand; pale-yellowish-brown (10YR 6/2 d, 15 - 55 10YR 2/2 m), fine- to coarse-grained sand; angular to well rounded, poorly to moderately sorted; composed dominantly of rose and milky quartz and black quartzite with lesser amounts of scoria, mica, and gneissic rock fragments; granules and pebbles from 2 to 8 mm composed dominantly of black quartzite and rose and milky quartzite and rose and milky quartz with lesser amounts of gneissic and granitic crystalline rock fragments, scoria, pumice, sandstone, and mica; very thin clay films on some grains; very weak effervescence to HCl.
Gravelly sand; light-brown (5YR 6/4 d, 5YR 4/4 m), 55 - 65 very fine to coarse-grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of clear and smokey quartz with lesser amounts of pumice, mica, and gneissic and granitic grains; granules 2 to 3 mm composed dominantly of black quartzite and quartz with lesser amounts of mica, pyroclastic, and granitic clasts; very few thin, discontinuous clay films and some iron-oxide stains on some grains; weak to mod- erate effervescence to HCl.
Table 1. Lithologic description of veil cuttings from the deepest borehole in the Rio Bravo 1 piezometer nest - Concluded
RIO BRAVO 1
Depth interval below land surface
Lithology (feet)
Clayey, silty, gravelly sand; light-brown (SYR 6/4 d, 65 - 95 SYR 4/4 m) clay to coarse-grained sand; angular to subrounded, poorly to moderately sorted; composed dominantly of clear, rose, and smokey quartz and black quartzite with lesser amounts of mica, pumice, basalt, and granitic and metamorphic grains; pebbles up to 20 mm composed dominantly of black quartzite and quartz with lesser amounts of mica, pumice, and metamorphic and granitic clasts; increasing abundance of metamorphic clasts with depth around 80 feet; very few thick, discontinuous grain coatings with clay films and iron-oxide stains; moderate to strong effervescence to HC1; weak cementing with CaCCU and clay is apparent.
Clayey, silty, gravelly sand; light-brown (SYR 6/4 d, 95 - 120 SYR 4/4 m) clay to coarse-grained sand; angular to subrounded, poorly to moderately sorted; composed dominantly of clear, smokey, and rose quartz with lesser amounts of metamorphic and granitic clasts and pyroclastic grains; pebbles to 8 mm composed dominantly of quartz and black quartzite; few thin, discontinuous clay and iron-oxide films on grains; moderate to strong effervescence to HCl, some CaCCU coatings on grains, CaCO^ nodules 1 to 2 mm.
Clayey, silty, gravelly sand; light-brown (5YR 6/4 d, 120 - 148.5 5YR 4/4 m) clay to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of clear and milky quartz and black quartzite with lesser amounts of mica, volcanic, metamorphic, and granitic grains; pebbles up to 15 mm composed dominantly of black quartzite and quartz; very thin, discontinuous clay films and iron-oxide stains, minor cementation of grains by iron oxide; moderate to strong effervescence to HCl increasing with depth.
RIO BRAVO I
SOUTH NORTH
4950 '-
4900 '-
-
4850 1 -
4800 '-
-
4750 1
ID 350137106410501 ID 350137106410502 ID 350137106410503
MP 4930. 88 MP 4930. 81 MP4930.58
TD 38 .
TD 103.8
TD 148.5
4
- 4950
- 4900
-
- 4850
-
- 4800
-
_ 47«?n
RIO BRAVO 2
WES
4950 '-,
4900 '-
-
4850 '-
-
4800 '-
4750'
T E
ID 350138106395501 ID 350138106395502 ID 350138106395503
MP4928.71 MP4928.84 MP4928.91
TD 4
TD 91.16
8.60
TD 1 53 . 53
AST
i- 4950
- 4900
-
- 4850
-
- 4800
i- 475 n
I 0 FEET
0 I
VERT I CAI_
DATUM
2 3 METERS
EXAGGERATION X
IS SEA LEVEL.
10
I D
MP
TD
EXPLANAT1 ON
STATION- I DENT 1FI CAT 1 ON NUMBER
MEASURING-PO1NT ALTITUDE (TOP OF CASING)
TOTAL DEPTH, IN FEET
Figure 3.--Configuration of piezometers in the Rio Bravo 1 and Rio Bravo 2
piezometer nests.
RIO BRAVO 1
DEPTH,IN
FEETSOIL DESCRIPTION
DRILLINGRATE,INFEET PERMINUTE
DEPTH,IN
FEETSOIL DESCRIPTION
DRILLINGRATE,INFEET PERMINUTE
\J
5 =
10 =
15 =
20 =
25:
30 =
35:
:
140:
145-
1 t;n =
SMALL GRAVEL LAYER
SILTY SAND WITH CLAY SMALL GRAVEL LAYER
GRAVELLY SAND
WITH SOME COBBLES
SILTY FINE SAND WITH CLAY
SILTY CLAY WITH SOME SAND
GRAVELLY SAND
GRAVELLY SAND
SILTY CLAY
SILTY FINE TO MEDIUM SAND WITH SOME GRAVEL
NO GRAVEL
WITH SOME GRAVEL
FINE TO MEDIUM SAND WITH SOME GRAVEL
OCCASIONAL COBBLES
WITH CLAY LAYERS
SILTY FINE SAND WITH CLAY
WITH GRAVEL
FINE TO MEDIUM SAND WITH SOME GRAVEL
FINE TO MEDIUM SAND WITH SOME GRAVEL AND CLAY
SILTY FINE TO MEDIUM SAND
MEDIUM TO COARSE SAND WITH SOME GRAVEL
0.4
0.5
1.7
0.7
0.4
1.0
0.2
0.6
1.4
0.4
1.2
0.8
0.6
Figure 4.--Driller's log
pi ezometer
of the deepest borehole in the Rio Bravo 1
nest.
10
ELECTRIC LOG
UONG NORMAL-
SHORT NORMAU
10 OHMS PER DIVISION
Q tn
I 60
LATERALOG
20 OHMS PER
DIVISION
UOW
UAND I
N
FEET
>
CO
05
*» 3
O
O
O
DEPTH
BE
SURFACE ,
0> $,
N
C0 o
0
C
0
=^
^3~
ES
^
=
SPONTANEOUS
POTENTIAL (SP)
100 MIUUIVOUTS
PER DI V1 S ION
GAMMA (G)
SINGLE-POINT
COUNTS PER RESISTIVITY (R
SE
CO
ND
20
40
60
i
2 0
O
HM
S
PE
R
DIV
IS
IO
N
16
0
CAL I
PER
INCHES (DIAMETER]
o -
SM
2
0-
Z
Ul<
111J
IL
40T
5
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!0
-
60
TJ N
-
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ui 80
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20
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; u hi ! ^ ;"f 1 TTT 'f il 1 I
li:'
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- ! it
Figure 5.--Geophysical lo
gs of the
deepest borehole in
th
e Ri
o Bravo
1 piezometer ne
st
Rio Bravo 2
The Rio Bravo 2 piezometer nest is on the south side of Rio Bravo Boulevard (fig. 1), approximately 1,200 feet east of the east riverside drain (the Albuquerque Drain) along the Rio Grande (latitude 35°01'38", longitude 106°39'55"). The piezometers are oriented approximately east-west and the deepest piezometer (153.53 feet) is the western piezometer (fig. 3). The distance between the western and middle piezometers is 17.4 feet and the distance between the middle and eastern piezometers is 15.3 feet. The driller's log is shown in figure 6 and the geophysical logs are shown in figure 7. The description of well cuttings is in table 2.
Table 2. Lithologic description of well cuttings from the deepest borehole in the Rio Bravo 2 piezometer nest
[d, dry; m, moist; mm, millimeters; HCl, 10 percent hydrochloric acid]
RIO BRAVO 2
Depth interval below land surface
Lithology (feet)
Clayey, silty sand; pale-brown (5YR 5/2 d, 5YR 3/4 m) 0-35 clay to medium- to coarse-grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of clear and milky quartz and black quartz- ite with lesser amounts of mica, pumice, and basalt; pebbles to 12 mm composed of black quartzite and quartz; few thin, discontinuous clay films, locally thick; strong effervescence to HCl.
Silty, gravelly sand; pale-yellowish-brown (10YR 6/2 d, 35 - 80 5YR 3/4 m) silt to coarse-grained sand; angular to subrounded, poorly to moderately sorted; composed dom- inantly of rose and smokey quartz and black quartzite with lesser amounts of mica and metamorphic grains; pebbles to 20 mm composed dominantly of black quartzite and quartz with lesser amounts of mica, basalt, and granitic and metamorphic clasts; few thin, discontinuous clay films and iron-oxide stains; some grain cementation by oxides; strong to violent effervescence to HCl.
12
Table 2. Lithologic description of well cuttings from the deepest borehole in the Rio Bravo 2 piezometer nest - Concluded
RIO BRAVO 2
Depth interval below land surface
Lithology (feet)
Silty, gravelly sand; grayish-orange-pink (5YR 7/2 d, 80 - 115 5YR 5/6 m) silt to very coarse grained sand; angular to subrounded, poorly to moderately sorted; composed dominantly of smokey and clear quartz and brown and black quartzite with lesser amounts of mica and meta- morphic grains; pebbles to 18 mm composed of black and brown quartzite, quartz, and granitic clasts; thin, discontinuous clay films and iron-oxide stains; strong effervescence to HC1.
Gravelly sand; pale-yellowish-brown (10YR 6/2 d, 5YR 115 - 130 5/2 m), fine- to very coarse grained sand; angular to subrounded, poorly to moderately sorted; composed dominantly of rose, milky, and smokey quartz and black quartzite with lesser amounts of mica and metamorphic grains; granules and pebbles to 5 mm composed dom- inantly of black quartzite and quartz; thin, discon- tinuous clay films and some thin iron-oxide stains; moderate to strong effervescence to HC1.
Silty, gravelly sand; grayish-orange-pink (5YR 7/2 d, 130 - 153.5 5YR 6/4 m) silt to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of rose and smokey quartz and black quartzite; pebbles to 8 mm composed dominantly of black quartzite and quartz with lesser amounts of mica and metamorphic and igneous clasts; thin, discontinuous clay films, some minor iron-oxide stains; moderate to strong effervescence to HC1.
13
RIO BRAVO 2
DEPTH,IN
FEETSOIL DESCRIPTION
DRILLING DEPTH, RATE,IN IN FEET PER FEET MINUTE
75
SOIL DESCRIPTION
u
5-
10 =
15 =
20 =
25 ~
30 =
35 =
4o ~
45 1
50 =
55 I
60 -
65:
70 :
75 :
SILTY CLAY WITH SOME SAND
WITH SAND
CLAYEY SILT WITH SAND
SILTY CLAY WITH SOME SAND
CLAYEY SILT
SILTY CLAY
WITH MEDIUM TO COARSE SAND
CLAYEY SAND
SANDY GRAVEL WITH FREQUENT COBBLES AND BOULDERS
SANDY GRAVEL WITH COBBLES AND BOULDERS
COARSE SAND WITH GRAVEL AND COBBLES
SANDY GRAVEL WITH FREQUENT COBBLES AND BOULDERS
GRAVELLY SAND WITH SOME COBBLES
1.0
2.0
3.2
5.01.0
1.6
6.2
1.4
3.0
4.0
0.8
1.2
2.0
1.0
1.8
2.6
DRILLINGRATE, INFEET PERMINUTE
90-
100
105 =
110-
115
120-
125
130
135
140
145 -
150
-
-
-
-
:
-
_
)-
-
^ -
GRAVELLY SAND WITH SOME COBBLES
CLAYEY SAND WITH SOME GRAVEL GRAVELLY SAND WITH SOME CLAY AND OCCASIONAL COBBLE
SANDY CLAY WITH SOME GRAVEL
CLAYEY SAND WITH SOME GRAVEL AND COBBLES
CLAYEY SAND WITH SOME GRAVEL AND \OCCASIONAL COBBLE
SILTY CLAY WITH SOME SAND AND GRAVEL
NO GRAVEL
SANDY CLAY WITH SOME GRAVEL
GRAVELLY SAND WITH SOME CLAY
WITH OCCASIONAL COBBLE OR BOULDER
SILTY CLAY WITH SOME SAND
GRAVELLY SAND WITH SOME CLAY
SANDY CLAY WITH SOME GRAVEL
CLAYEY SAND WITH SOME GRAVEL WITH COBBLES
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0.6 -1 0.5 L
1.0
1.5
10.0
14.0
2.5
2.0
1.0
0.5
1.0
1.3
Figure 6.--Driller's log of the deepest borehole in the Rio Bravo 2
piezometer nest.
14
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Rio Bravo 3
The Rio Bravo 3 piezometer nest (fig. 1) is on the south side of Rio Bravo Boulevard west of the intersection of Rio Bravo Boulevard and 2nd Street (latitude 35°01'38", longitude 106°39'32"). The piezometers are oriented approximately east-west and the deepest piezometer (148.0 feet) is the eastern piezometer (fig. 8). The distance between the eastern and middle piezometers is 15.9 feet and the distance between the middle and western piezometers is 16.0 feet. The driller's log is shown in figure 9 and the geophysical logs are shown in figure 10. The description of well cuttings is in table 3.
Table 3. Lithplogic description of well cuttings from the deepest borehole in the Rio Bravo 3 piezometer nest
[d, dry; m, moist; mm, millimeters; HCl, 10 percent hydrochloric acid]
RIO BRAVO 3
Depth interval below land surface
Lithology (feet)
Clayey, silty sand; medium-light-gray (N6 d, N4 m) silt 0-10 and clay to medium-grained sand; angular to subrounded, poorly sorted; composed dominantly of quartz; strong effervescence to HCl.
Gravelly sand; light-brownish-gray (SYR 6/2 d, SYR 4/1 m), 10 - 20 fine- to very coarse grained sand; angular to well rounded, poorly to moderately sorted; composed dominantly of rose and milky quartz and black quartzite with lesser amounts of pumice, mica/biotite, and metamorphic grains; granules to 4 mm composed dominantly of black quartzite with lesser amounts of pumice, mica, and metamorphic clasts; very few thin, discontinuous clay films and iron-oxide stains; weak to moderate effervescence to HCl.
Clayey, silty, gravelly sand; pale-yellowish-brown 20 - 30 (10YR 6/2 d, SYR 5/6 m) clay, fine silt, and medium- to coarse-grained sand; subangular to subrounded, poorly to moderately sorted; composed dominantly of rose and milky quartz with lesser amounts of pumice, mica, and volcanic glass; granules to 3 mm composed of black quartzite with some pumice; clay films and oxide stains not apparent; moderate to strong effervescence to HCl.
16
Table 3. Lithologic description of well cuttings frpm_ _the deepest borehole in the Rio Bravo 3 piezometer nest - Concluded
RIO BRAVO 3
Depth interval below land surface
Lithology ( feet)
Gravelly sand; pale-yellowish-brown (10YR 6/2 d, 30 - 90 10YR 4/2 m), very fine to very coarse grained sand; angular to well rounded, poorly to moderately sorted; composed dominantly of rose and smokey quartz and black quartzite with lesser amounts of pumice, mica, and metamorphic grains; pebbles to 12 mm composed dominantly of black quartzite and quartz with lesser amounts of sandstone, pumice, gneissic and igneous crytalline clasts; very few discontinuous clay films and iron-oxide stains; moderate to strong effervescence to HCl.
Gravelly sand; light-brown (5YR 6/4 d, 5YR 4/4 m), 90 - 125 very fine to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of rose and smokey quartz and black quartzite with lesser amounts of pumice, mica, and granitic clasts; pebbles to 18 mm composed dom- inantly of black quartzite with lesser amounts of mica, pumice, and granitic clasts; few thin, dis- continuous clay films and iron-oxide stains; moderate to strong effervescence to HCl.
Clayey, silty, gravelly sand; yellowish-gray (5YR 8/1 d, 125 - 148 10YR 4/2 m) clay and silt to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of quartz and black quartzite with lesser amounts of mica and granitic clasts; pebbles to 12 mm composed dominantly of black quartzite and quartz with lesser amounts of mica, pumice, and metamorphic and granitic clasts; moderate effervescence to HCl.
17
RIO BRAVO 3
WEST EAST
4950--1
4900 '-
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4850'-
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4800'-
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ID 350138106393203 ID 350138106393202 ID 350138106393201
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TD 49.33
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EXPLANATION
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H- 4850
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STATION- I DENT 1FI CAT ION NUMBER
MEASURING-PO1 NT ALTITUDE (TOP OF CASING)
TOTAL DEPTH, IN FEET
Figure 8.--Configuration of piezometers in the Rio Bravo 3 and Rio Bravo k
piezometer nests.
18
DEPTH,
IN SOIL DESCRIPTION
0
RIO BRAVO 3
DRILLING DEPTH, RATE,IN IN FEET PER FEET MINUTE
5-
10-
15-
20-
25
30
35
50;
55;
60.
65
70
75
SILTY CLAY WITH SOME SAND
FINE TO MEDIUM SAND WITH OCCASIONAL FINE GRAVEL LAYER
SILTY CLAY WITH SOME SAND
GRAVELLY SAND WITH COBBLES AND BOULDERS
GRAVELLY SAND WITH COBBLES AND BOULDERS
OCCASIONAL BOULDER OR COBBLE
FREQUENT COBBLE OR BOULDER
1.6
0.5
3.3
1.0
2.0
0.6
1.7
1.0
1.3
SOIL DESCRIPTIONDRILLINGRATE,INFEET PERMINUTE
/ 2
8n~
85=
90 Z
95 I
100 =
105-
110-
115"
120-
125"
130 =
135_
140-
145 =
1 c n _
GRAVELLY SAND WITH OCCASIONAL COBBLE OR BOULDER
SILTY CLAY WITH SOME SAND
SMALL CEMENTED LAYER
WITH SOME GRAVEL
CLAYEY SAND WITH SOME GRAVEL
SILTY CLAY
WITH SAND
GRAVELLY SAND
CLAYEY SAND WITH SOME GRAVEL
GRAVELLY SAND WITH SOME CLAY
GRAVELLY SAND WITH OCCASIONAL SMALL CLAY LAYER
SILTY CLAY WITH SAND
WITH GRAVEL
GRAVELLY SAND WITH SOME CLAY
CLAYEY SAND WITH SOME GRAVEL
MEDIUM TO COARSE SAND WITH SOME GRAVEL
GRAVELLY SAND WITH COBBLES
MEDIUM TO COARSE SAND WITH GRAVEL AND CLAY
1.3
1.5
2.5
1.2
1.8
4.0
2.3
2.0
5.4
1.5
1.7
Figure 9.--Dri11er's log of the deepest borehole in the Rio Bravo 3
piezometer nest.
19
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Figure 10.--Geophysica1 logs of the
deepest
borehole in
th
e Rio
Brav
o 3
piezometer ne
st
jlio Bravo 4
The Rio Bravo 4 piezometer nest (fig. 1) is on the south side of Rio Bravo Boulevard west of the intersection of Rio Bravo Boulevard and Prince Street (latitude 35°01'35", longitude 106°39'06"). The piezometers are oriented approximately east-west and the deepest piezometer (149.4 feet) is the western piezometer (fig. 8). The distance between the western and middle piezometers is 13.7 feet and the distance between the middle and eastern piezometers is 14.4 feet. The driller's log is shown in figure 11 and the geophysical logs are shown in figure 12. The description of well cuttings is in tab 1 e 4 .
Table 4. Lithologic description of well cuttings from the deepest borehole in the Rio Bravo 4 piezometer nest
[d, dry; m, moist; mm, millimeters; HCl, 10 percent hydrochloric acid]
RIO BRAVO 4
Lithology
Depth intervalbelow land surface
(feet)
Clayey, silty, gravelly sand; grayish-orange-pink (5YR 0-15 7/2 d, 5YR 5/2 m) clay, silt, and fine- to coarse- grained sand; angular to subrounded, poorly to mod- erately sorted; composed dominantly of quartz and black quartzite; pebbles to 5 mm composed dominantly of black quartzite; very thin, discontinuous clay films; moderate to strong effervescence to HCl.
Gravelly sand; pale-yellowish-brown (10YR 6/2 d, 10YR 15 - 40 4/2 m), fine- to very coarse grained sand; angular to well rounded, poorly to moderately sorted; composed dominantly of quartz and black quartzite with minor amount of mica; pebbles to 8 mm composed dominantly of black quartzite and quartz with lesser amounts of mica, sandstone, and volcanic clasts; few thin, dis- continuous clay films; moderate to strong effervescence to HCl.
21
Table 4, Lithologic description of well cuttings from the deepest borehole in the Rio Bravo 4 piezometer nest - Concluded
RIO BRAVO 4
Depth interval below land surface
Lithology (feet)
Gravelly sand; pale-yellowish-brown (10YR 6/2 d, 5YR 40 - 70 5/2 m), fine- to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dom- inantly of quartz and black quartzite with lesser amounts of biotite and metamorphic clasts; pebbles to 23 mm composed dominantly of black quartzite and quartz with lesser amounts of mica and gneissic and granitic clasts; few very thin, discontinuous clay films and iron-oxide stains; moderate to strong effervescence to HC1.
Gravelly sand; pale-yellowish-brown (10YR 6/2 d, 10YR 70 - 130 4/2 m), fine- to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of quartz and black quartzite with lesser amounts of biotite, pumice, and volcanic, metamorphic, and granitic clasts; pebbles to 10 mm composed dom- inantly of black quartzite and quartz with lesser amounts of mica and metamorphic, plutonic, and volcanic clasts; some mollusk shells from 105 to 110 feet; very few thin, discontinuous clay films and iron-oxide stains; moderate to strong effervescence to HC1.
Silty, gravelly sand; pale-yellowish-brown (10YR 6/2 d, 130 - 149.4 10YR 4/2 m) silt and fine- to very coarse grained sand; angular to rounded, poorly to moderately sorted; com- posed dominantly of quartz and black quartzite with lesser amounts of metamorphic grains; pebbles to 8 mm composed dominantly of black quartzite and quartz; shell material at 135 feet; very few thin, discontinuous clay films, some minor grain cementation by iron oxides; strong effervescence to HC1.
22
RIO BRAVO 4
DEPTH,
SOIL DESCRIPTIONDRILLING RATE,IN
FEET FEET PER MINUTEo ________________
ID-
20 1
25:
30 =
35 =
40
45:
50 =
55:
60 =
65:
70 =
7 5 : ... __
SILTY CLAY WITH SOME SAND
MEDIUM TO COARSE SAND
SILTY CLAY WITH SOME SAND
GRAVELLY SAND ,
SILTY SAND WITH SOME CLAY
SILTY CLAY
GRAVELLY SAND WITH SOME COBBLES
WITH BOULDERS
GRAVELLY SAND WITH FREQUENT COBBLES AND BOULDERS
FREQUENT COBBLES AND OCCASIONAL BOULDER
SILTY FINE SAND
GRAVELLY SAND WITH FREQUENT COBBLES AND OCCASIONAL BOULDER
0.6
0.7
1.0
0.5
1.0
1.6
1.2
1.2
2.0
1.0
0.7
DEPTH,IN
FEETSOIL DESCRIPTION
DRILLINGRATE, INFEET PERMINUTE
/ J
80~
Qc~~05 _
~
90-
95 =
100 =
105 =
110 =
115 =
120-
125~
130-
135_
140 1
U5:
1 c n -
GRAVELLY SAND WITH FREQUENT COBBLES AND OCCASIONAL BOULDER
SILTY CLAY WITH SOME SAND
SANDY GRAVEL WITH FREQUENT COBBLES AND OCCASIONAL BOULDER
CLAYEY SAND WITH SOME GRAVEL
GRAVELLY SAND WITH FREQUENT COBBLES
OCCASIONAL SMALL CLAY LAYER
BOULDER
SILTY SAND WITH CLAY
GRAVELLY SAND WITH FREQUENT COBBLES
MEDIUM TO COARSE SAND WITH SOME SILT
SILTY SAND WITH SOME CLAY
SANDY SILT WITH SOME CLAY
CLAY SILT WITH SOME SAND
OCCASIONAL SMALL SAND LAYER
SILTY SAND WITH SOME CLAY
SMALL GRAVELLY LAYER
OCCASIONAL GRAVEL
MEDIUM TO COARSE SAND WITH SOME GRAVEL, TRACE SILT AND CLAY
0.7
1.0
0.6
0.4
1.0
0.6
1.2
0.6
1.2
2.4
1.6
Figure 11.--Dri1ler's log of the deepest borehole in the Rio Bravo 4
piezometer nest.
23
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MontarTo 1
The Montano 1 piezometer nest (fig. 1) is on the north side of Montano Road east of the intersection of Monta'no Road and Taylor Ranch Road (latitude 35°08'54", longitude 106°40'37"). The piezometers are oriented approximately east-west and the deepest piezometer (152.0 feet) is the eastern piezometer (fig. 13). The distance between the eastern and middle piezometers is 15.3 feet and the distance between the middle and western piezometers is 15.6 feet. The driller's log is shown in figure 14 and the geophysical logs are shown in figure 15. The description of well cuttings is in table 5.
Table 5 Lithologic description of well cuttings from the deepest borehole in the Montano 1 piezometer nest
[d, dry; m, moist; mm, millimeters; CaCO^, calcite; HCl, 10 percent hydrochloric acid]
MONTANO 1
Lithology
Depth intervalbelow land surface
(feet)
Silty sand; light-brown (5YR 6/4 d, 5YR 5/2 m) silt and fine- to coarse-grained sand; subangular to well rounded, poorly to moderately sorted; composed dominantly of clear, rose, and smokey quartz with lesser amounts of mica; thin, colloidal stains on some grains; moderate effervescence to HCl.
Sandy gravel; light-brown (5YR 6/4 d, 5YR 4/4 m), fine- to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of milky, clear, and smokey quartz, black quartzite, and basalt with lesser amounts of mica and granitic grains; pebbles to 5 mm composed dominantly of black quartzite and pumice with lesser amounts of metamorphic and igneous clasts; very thin, dis- continuous clay films and colloidal stains; mod- erate effervescence to HCl.
Clayey, sandy gravel; light-brown (5YR 6/4 d, 5YR 4/4-5/2 m) clay and fine- to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of quartz and black quartzite with lesser amounts of pumice, volcanic glass, and basalt; very thin, discontinuous clay films and colloidal iron-oxide stains; moderate to strong effervescence to HCl; some weak cementation of grains by CaCCs, CaCCU nodules 2 to 4 mm.
25
0-10
10 - 15
15 - 25
Table 5. Lithologic description of well cuttings from the deepest borehole in the Montano 1 piezometer nest - Continued
MONTANO 1
Depth interval below land surface
Lithology ( feet)
Sandy gravel; light-brown (5YR 6/4 d, 5YR 5/2 m), 25 - 50 fine- to coarse-grained sand; angular to well rounded, poorly to moderately sorted; composed dominantly of smokey, rose, and milky quartz and black quartzite with lesser amounts of mica and basalt; pebbles to 15 mm composed dominantly of black quartzite and volcanic clasts (basalt, andesite) with lesser amounts of quartz, metamorphic clasts, pumice, volcanic glass, and volcanics; moderate to strong effervescence to HC1.
Sandy gravel; light-brown to pale-yellowish-brown 50 - 55 (5YR 6/4 to 10YR 6/2 d, 5YR 5/2 m), fine- to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of quartz and black quartzite with lesser amounts of basalt, pumice, perlite, mica, feldspar, and metamorphic clasts; granules to 4 mm composed of basalt, andesite, and quartzite; very few thin, discontinuous clay films and colloidal oxide stains; weak to moderate effervescence to HC1.
Sandy gravel; pale-yellowish-brown (10YR 6/2 d, 55 - 80 10YR 4/2 m), fine- to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of quartz and black quartzite with lesser amounts of mica, feldspar, pumice, basalt, and metamorphic grains; pebbles to 7 mm composed dominantly of black quartzite and quartz with lesser amounts of basalt, sandstone, granite, and metamorphic clasts; few very thin, discontinuous clay films; moderate to strong effervescence to HCl.
26
Table 5. Lithologic description of well cuttings from the deepest borehole in the Montano 1 piezometer nest - Concluded
MONTANO 1
Depth interval below land surface
Lithology (feet)
Silty, clayey, gravelly sand; grayish-orange-pink 80 - 95 (5YR 7/2 d, 5YR 4/4 m), clayey silt to very coarse grained sand; angular to subrounded, poorly to moderately sorted; composed dominantly of quartz and black quartzite with lesser amounts of mica and feldspar; pebbles to 8 mm composed dominantly of black quartzite and quartz; few thin, dis- continuous clay films and minor iron-oxide stains and minor cementation of grains; strong effer- vescence to HC1, CaCOo nodules to 3 mm.
Gravelly sand; grayish-orange-pink (5YR 7/2 d, 95 - 120 5YR 6/5-4/2 m), fine- to coarse-grained sand; subangular to subrounded, poorly to mod- erately sorted; composed dominantly of clear, smokey, rose, and milky quartz with lesser amounts of black quartzite, pumice, mica, basalt, and andesite clasts; pebbles to 15 mm composed dominantly of black quartzite and quartz with lesser amounts of basalt and metamorphic clasts; few thin, discontinuous clay films and iron-oxide coatings; strong effervescence to HC1.
Gravelly sand; grayish-orange-pink (5YR 7/2 d, 120 - 152 5YR 5/2 m), fine- to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of yellow, rose, and milky quartz and black quartzite with lesser amounts of mica, feldspar, felsic volcanics; pebbles to 5 mm composed of black quartzite and quartz; few very thin, dis- continuous clay films and iron-oxide stains; moderate to strong effervescence to HC1.
27
MONTANO 1
WEST EAST
5000 ' -
4950 1 -
-
4900 ' -
-
4850' -
1 D 3508541 06403703 1 D 35 085 4 I 06 40 37 02 tD 35 0854 I 0640370 I
MP 4975.08 MP 4975.58 MP 4975.52
TD 18.41
TD 93.40
TD I 52 .0
r- 5000'
- 4950 '
-
- 4900 1
^- 4850'
- dftnn
MONTANO 2WEST
5000' -
4950' -
U QD
« 4900 ' ~I-J<
4850' -
4800 ' -
ID 350836 I 0639560 I
MP 4970 . 17
TD 1 47 .4
(
(
EAST
1D350836I06395602 1D350836I06395603
MP 4970. 07 MP 4969.84
TD 39.7
TD 99.0
1 10 FEET1 1 1 1 i
1 1 I 3123 METERS
r- 5000
- 4950
- 4900
- 4850
- 4800
VERTICAL. EXAGGERATION X 10 DATUM IS SEA LEVEL.
ID STATION
MP MEASURI
EXPLANAT ION
-IDENTIFICATION NUMBER
NG-POINT ALTITUDE (TOP OF CASING)
TD TOTAL DEPTH, IN FEET
Figure 13. Configuration of piezometers in the Montano 1
and Montano 2 piezometer nests.
28
MONTANO 1
DEPTH, UK.LL.INb
IN SOIL DESCRIPTION rrlHcBFEET FEET PER
MINUTEo q
5 =
-10-
15 =
-o r\20
25 =
30-
35:
40 =
45 :
50^
55 =
60 =
65 =
70 =
75 :
FINE TO MEDIUM SAND, BROWN
CLAY
MEDIUM TO COARSE SAND WITH SOME GRAVEL
CLAYEY MEDIUM TO COARSE SAND
CLAY WITH SOME SAND
FINE TO MEDIUM SAND WITH SOME CLAY
FINE TO MEDIUM SAND WITH SOME GRAVEL
WITH COARSE GRAVEL
WITH COBBLES AND BOULDERS
FINE TO COARSE GRAVEL WITH COBBLES AND BOULDERS
MEDIUM SAND WITH FINE GRAVEL
0.5
9.0
3.0
'4.0
1.0
2.0
2.5
14.0
2.4
, N FEET
DRILLING
SOIL DESCRIPTION FEET'PERMINUTE
/ .?
Qn ~"
85=
90-
95 I
100=
105 =
110 =
115 =
120 =
12S~
130 =
1351
140 =
145 =
1 en -
MEDIUM SAND WITH FINE TO COARSE GRAVEL
WITH THIN CLAY LAYERS
CLAYEY SAND
WITH SOME GRAVEL
SANDY CLAY
CLAYEY SAND
MEDIUM TO COARSE SAND WITH GRAVEL AND CLAY
GRAVELLY SAND WITH TRACE OF CLAY
GRAVELLY SAND WITH SOME CLAY
GRAVELLY SAND
MEDIUM TO COARSE SAND WITH SOME GRAVEL
OCCASIONAL CLAY LAYER
CLAY WITH SAND AND GRAVEL
WITH SILT
2.4
5.5
1.0
1.4
2.6
1.0
1.6
Figure 14.--Dri11er's log of the deepest borehole in the MontarTo 1
piezometer nest.
29
LO
O
ELE
CT
RIC
LO
G
SH
OR
T
NO
RM
AL
. (S
N)
UO
NG
N
OR
MA
U
(UN
J
20
O
HM
S
PE
R
D I
V I
S
I O
N5
0l
60
80
10
0
120
140
160
18
0
- m i S
=S
5-̂^ sr =t
^
~1 F^ v
^ i^
=4 ^ t=
uZ^S
lo
=4 fe==
t=i=
= =
LA
TE
RA
LO
G
20 O
HM
S
PE
R
DIV
IS
IO
N
40
60
80
100
120
14
0
1 60
= ^
= . "
=
r^
|
J
=d
=n
|
=
s=\
= =
I ==t
= ==
^=1
fca t=
SP
ON
TA
NE
OU
S
PO
TE
NT
IAL
(S
P)
60
0 M
IL.U
IVO
L.T
S
PE
R
DIV
ISIO
NI
I I
GA
MM
A
(G)
COUNTS PER
SECOND
20
40
60
SIN
GL
E-P
OIN
T
RE
SIS
TIV
ITY
(R
)
20
O
HM
S
PE
RD
I
V I
S
I
ON
12 I
CA
LI
PE
R
INC
HE
S
(DIA
ME
TE
R)
14
16
18
20
Figu
re 15.--Geophysical logs of
the
deepest
borehole in
the
Montano
1 piezometer nest.
Montaifo 2
The Montario 2 piezometer nest (fig. 1) is on the north side of MontaTio Road east of the intersection of Montano Road and Rio Grande Boulevard (latitude 35°08'36", longitude 106°39'56"). The piezometers are oriented approximately east-west and the deepest piezometer (147.4 feet) is the western piezometer (fig. 13). The distance between the western and middle piezometers is 16.8 feet and the distance between the middle and eastern piezometers is 16.1 feet. The driller's log is shown in figure 16 and the geophysical logs are shown in figure 17. The description of well cuttings is in table 6.
Table 6. Lithologic description of well cuttings from the deepest borehole in the Montano 2 piezometer nest
[d, dry; m, moist; mm, millimeters; CaCCs, calcite; HCl, 10 percent hydrochloric acid]
MONTANO 2
Depth interval below land surface
Lithology (feet)
Clayey, silty, gravelly sand; grayish-orange-pink 0-10 to pale-brown (5YR 7/2 to 5YR 5/2 d, 5YR 3/2 m) clay and silt to fine-grained sand; angular to rounded, moderately sorted; composed dominantly of quartz and black quartzite with some mica present; pebbles to 5 mm composed of quartzite and volcanic and plutonic clasts; strong effervescence to HCl,
nodules to 2 mm.
Gravelly sand; pale-brown (5YR 5/2 d, 5YR 2/2 m) , fine- 10 - 40 to coarse-grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of smokey, rose, and milky quartz and black quartzite with lesser amounts of basalt, obsidian, pumice, mica, and granitic and metamorphic grains; granules to 4 mm composed of black quartzite, basalt, and quartz; few very thin, discontinuous clay films; weak to moderate effervescence to HCl.
Sandy gravel; pale-brown (5YR 5/2 d, 5YR 3/2 m) , very 40 - 80 fine to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of clear, rose, milky, and smokey quartz and black quartzite with lesser amounts of mica, feldspar, pumice, and granitic and metamorphic grains; pebbles to 6 mm composed dominantly of black and brown quartzite and rose quartz with lesser amounts of sandstone, basalt, metamorphic, and granitic clasts; minor iron-oxide stains on grains; weak effervescence to HCl.
31
Table 6. Lithologic description of well cuttings from the deepest borehole in the Montano 2 piezometer nest - Concluded
MONTANO 2
Lithology
Depth intervalbelow land surface
(feet)
Gravelly sand; light-brown (5YR 6/4 d, 10YR 4/2 tn), 80 - 95 fine- to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of quartz and black quartzite with lesser amounts of feldspar, basalt, tnetamorphic, and plutonic fragments; granules to 4 mm composed dominantly of black quartz- ite, basalt, and quartz with lesser amounts of granitic and metamorphic fragments; few thin, dis- continuous clay films and minor iron-oxide stains on grains; moderate to strong effervescence to HCl.
Sandy gravel; brownish-gray (5YR 4/1 d, 5YR 3/2 m), 95 - 120 fine- to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of quartz and black quartzite with lesser amounts of feldspar, mica, metamorphic, and volcanic fragments; pebbles to 12 mm composed dominantly of black and brown quartzite, quartz, and basalfwith lesser amounts of sandstone, metamorphic, granitic, and andesitic clasts; few very thin, discontinuous clay films and minor iron-oxide stains; moderate to strong effervescence to HCl.
Gravelly sand; pale-yellowish-brown (10YR 6/2 d, 120 - 147.4 10YR 4/2 m), very fine to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of clear, rose, yellow, and milky quartz and black quartzite with lesser amounts of feldspar, mica, granitic, and metamorphic grains; pebbles to 10 mm composed dominantly of black quartzite and quartz with lesser amounts of metamorphic, granitic, andesitic, and sandstone clasts; minor iron-oxide stains; moderate to strong effervescence to HCl.
32
MONTANO 2
DEPTH, IN SOIL DESCRIPTION
FEET
DRILLING DEPTH RATE, IN | N ' FEET PER FEET MINUTE
DRILLING
SOIL DESCRIPTION FEET'PERMINUTE
\J -
c
10 =
15 =
20-
25:
30 =
35:
40"
50 =
55 =
60-
65:
70 =
75 :
s^SANDY CLAY WITH SILT
SILTY FINE SAND WITH
SILTY CLAY
FINE TO MEDIUM SAND W COBBLE
COBBLE AND BOULDER
WITH SOME GRAVEL
WITH BOULDERS
GRAVEL
ITH OCCASIONAL
LAYER
SANDY GRAVEL WITH COBBLES AND BOULDERS
FREQUENT BOULDERS
SANDY GRAVEL WITH COBBLES
GRAVELLY SAND WITH COBBLES
SANDY GRAVEL WITH COBBLES AND OCCASIONAL CLAY LAYER
COBBLE AND BOULDER LAYER
CLAYEY SAND WITH SOME FINE GRAVEL
1.0
3.0
1.0
2.0
1.0
4.0
,.*
1.0
0.2
0.8
1.0
/ J
80-
Qc~o5_
90 Z
95 I
100 =
105"
110~
115-
120-
125 =
130 =
135 =
140:
i45 =
1 en
CLAYEY SAND WITH SOME FINE GRAVEL
SI LTV CLAY
GRAVELLY SAND
WITH COBBLES AND BOULDERS
SANDY GRAVEL WITH FREQUENT COBBLES AND BOULDERS
BOULDER LAYER
GRAVELLY SAND
FINE TO MEDIUM SAND WITH GRAVEL AND OCCASIONAL COBBLE
SANDY GRAVEL WITH COBBLES AND BOULDERS
MEDIUM TO COARSE SAND WITH GRAVEL
WITH COBBLES
CLAYEY FINE TO MEDIUM SAND WITH GRAVEL AND OCCASIONAL COBBLE
0.4
0.8
1.0
2.0
1.0
1.6
1.0
2.0
1.0
Figure l6.--Dri1ler's log of the deepest borehole in the Montano 2
piezometer nest.
33
ELECTRIC LOG
L.ON G NORMA U
SHORT NORMAL.
20 OHMS PER DIVISION
LATERALOG
5 OHMS PER
DIVISION
SPONTANEOUS
POTENT IAL
{ SP)
100 MILL. I
VOLTS
PER DI VISION
I I
I
GAMMA (G)
SINGLE-POINT
COUNTS PER RESISTIVITY (R)
SECOND
20OHMS PER
204060
D
I V I
S
I ON
CALI PER
INCHES (DIAMETER)
10
1
2
11
, uL
,,rri
tTi
2 01 I
t fj|j
' ]
JT
't" \i
'-If
40
: 1
I
- j
: tt 'ft
: : |
!
60
ill
' i|:
i::
^ :|
' !
'ji:
I
so f
";:|:
g |
: ::
: If
l "
^ I
] 0
0
- : ::
:
; :
120
; "
; -
; ;
: : ]:
;;; ;;
l 40 il
;:;;
; i
1 |
I;;
:: ;
, 5 0
IS
ffllf
flMllM
fPS
filff
ira
fil
4
16
18
L_
1 i
j JJ
i i
'j
r I
* 1
:" '
. :
1 I
: : :
-:.::
:
: :
| :v
: . I
::
::::
: ::
:
L -:
:
ft
::: :
1-
:
:
1
.::':':.
: :
:. :::::::£
:
Figure 17
.--G
eoph
ysic
al logs of
the
deep
est
borehole in
th
e Montano 2
piezometer ne
st.
Montano 3
The Montano 3 piezometer nest (fig. 1) is on the south side of Montano Road approximately 900 feet west of the intersection of Montano Road and Guadalupe Trail (latitude 35°08'27", longitude 106°39'13"). The piezometers are oriented approximately east-west and the deepest piezometer (149.8 feet) is the middle piezometer (fig. 18). The distance between the western and middle piezometers is 17.3 feet and the distance between the middle and eastern piezometers is 21.1 feet. The driller's log is shown in figure 19 and the geophysical logs are shown in figure 20. The description of well cuttings is in table 7.
Table 7. Lithologic description of well cuttings from the deepest borehole in the Montano 3 piezometer nest
[d, dry; m, moist; mm, millimeters; CaCO.,, calcite; HCl, 10 percent hydrochloric acid]
MONTANO 3
Lithology
Depth intervalbelow land surface
(feet)
Clayey, silty sand; grayish-orange-pink (5YR 7/2 d, 5YR 5/2 m) silt and clay to medium-grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of quartz and quartzite; strong effervescence to HCl, CaCCs nodules to 2 mm.
Gravelly sand; pale-yellowish-brown (10YR 6/2 d,5YR 5/2) silt to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dom- inantly of rose and milky quartz and black quartzite with lesser amounts of mica, feldspar, pumice, basalt, and metamorphic grains; pebbles to 5 mm composed dom- inantly of black quartzite and quartz with lesser amounts of metamorphic, sandstone, and basalt clasts; strong effervescence to HCl, CaCO^, coats some clasts, cements some grains, and as nodules to 2 mm.
0-15
15 - 45
35
Table 7. Lithologic description of well cuttings from the deepest borehole in the Montano 3 piezometer nest - Concluded
MONTANO 3
Lithology
Depth intervalbelow land surface
(feet)
Gravelly sand; pale-yellowish-brown (10YR 6/2 d, 10YR 45 - 85 4/2 m), fine- to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed domi- nantly of rose and milky quartz and black quartzite with lesser amounts of mica, pumice, metamorphic, and plutonic grains; pebbles to 8 mm composed dominantly of black and brown quartzite and quartz with lesser amounts of sand- stone, granitic, and metamorphic clasts; few thin, dis- continuous clay films and colloidal iron-oxide stains; moderate to strong effervescence to HC1.
Silty, clayey, gravelly sand; pale-yellowish-brown 85 - 135 (10YR 7/2 d, 10YR 5/2 m) silt and clay to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dominantly of rose and milky quartz and black quartzite with lesser amounts of mica, feldspar, metamorphic, and volcanic fragments; pebbles to 15 mm composed dominantly of black and brown quartzite and quartz with lesser amounts of sandstone, metamorphic, and granitic clasts; few colloidal iron-oxide stains; strong effervescence to HC1, CaCO^ nodules 1 to 2 mm.
Gravelly sand; light-yellowish-brown (10YR 6/2 d, 135 - 149 10YR 4/2 m), fine- to very coarse grained sand; angular to subrounded, poorly to moderately sorted; composed dominantly of rose and milky quartz and black quartzite with lesser amounts of metamorphic and granitic grains; pebbles to 12 mm composed dominantly of black quartzite with lesser amounts of quartz and granitic clasts; very few thin, discontinuous clay films and iron-oxide stains; strong to violent effervescence to HC1.
36
MONTANO 3
WEST
5000'I
4950 1 -
4900' ~
4850'-
4800
ID 350827106391303
MP 4972 .32
ID 350827106391301
MP 4972 . 33
TD 149.8
ID 350827106391302
MP 4972.49
EASTr- 5000
TD 99. 0
H- 4950
- 4900
4850
4800
SOUTH
5000 ' -1
4950' -
4900' -
4850 1 ~
4800
ID 350821106383701
MP 4975.01
MONTANO 4
ID 350821106383702
MP 4974 .00
ID 350821106383703
MP 4974.68
NORTH
r- 5000
TD 131.5
TD 50.2
- 4950
- 4900
- 4850
4800
I 0 FEET
1 D
MP
TD
0123 METERS
VERTICAL. EXAGGERATION X 10 DATUM IS SEA LEVEL.
EXPLANATION
STAT1 ON- 1 DENT 1 F1 CAT 1 ON NUMBER
MEASUR1NG-POINT ALTITUDE (TOP OF CASING)
DEPTH, IN FEETTOTAL
Figure 18.--Configuration of piezometers in the Montano 3 and Montano
piezometer nests.
37
MONTANO 3
DEPTH,IN
FEETSOIL DESCRIPTION
DRILLINGRATE, INFEET PERMINUTE
DEPTH, N
FEETSOIL DESCRIPTION
DRILLINGRATE, INFEET PERMINUTE
u
5-
10 =
15 =
20-
2 5l
30 =
35 1
40 =
45^
50 I
55 =
60=
65:
70-
~IC -
\. SILTY CLAY
CLAYEY SILT WITH SOME SAND
SILTY CLAY WITH SOME SAND
SAND WITH SOME SILT PLUS CLAY
SAND WITH GRAVEL
GRAVELLY SAND
WITH COBBLES
WITH BOULDERS
FREQUENT BOULDERS
SAND WITH GRAVEL, FREQUENT COBBLES AND BOULDERS
CLAYEY SAND
GRAVELLY SAND WITH COBBLES AND CLAY
0.8
0.2
0.4
0.6
0.8
1.0
0.4
2.0
0.6
/ J
ou
8S=-
90-
__
95--
100 =
-105 =
110 =
115 =
120 =
125 =
130-
135_
140 =
145-
1 CA -
SILTY SAND WITH SOME CLAY
SILTY CLAY WITH SOME SAND
SILTY SAND WITH SOME CLAY
INTERBEDDED CLAY LENSES
GRAVELLY SAND WITH COBBLES AND CLAY
SOME CLAY
SILTY SAND WITH SOME CLAY AND GRAVEL
SILTY SAND WITH SOME GRAVEL AND CLAY
SAND WITH SOME CLAY AND GRAVEL
WITH COBBLES
CLAYEY SAND WITH GRAVEL AND COBBLES
SAND WITH SOME CLAY AND GRAVEL
DECREASING CLAY CONTENT
INCREASING CLAY CONTENT
GRAVELLY SAND WITH SILT AND CLAY
GRAVELLY SAND WITH SOME COBBLES
WITH BOULDERS
^ 0.6 y0.4
0.6
0 .0
0.6
1.0
1.2
1.6
U . o
1.2
1.6
1.0
Figure 19.--Dri1ler's log of the deepest borehole in the Montanb 3
piezometer nest.38
SPONTANEOUS
POTENTIAL ( SP
I 00 MILLI VOLTS PER D i V IS I ON
I_____I____I
UJ
< ° \u.D "V)
Q H 40 Z UJ < UJ J U. 60
9 Z 0 - 80Jhi CD
100
I£ 120 -UJ Q
GAMMA ( G )
COUNTS PER SECON O
20 40 60< J J
ii
t
-1
UJ
L
i
i.
":|-
t,. -^-.-3
j l
; ?
:.5
q:r'^ G
*a~] "
:i
' i i
iVfc',
-^- Srv
~r
J.J
jC"
:ii!
: i;.'
-f-
-,.
S 1 NGLE-PO 1 NT RES 1 ST 1 VI TY ( R )
20 OHMS PER
D 1 V 1 S 1 ON1 1 1
':\
sT^
"/
I
"̂^
-~.
Jsr,-C'
i :; '
fH^; i : : '':''{ "
' \:,.
T' "i*
^r
"tt
Montano 4
The Montano 4 piezometer nest (fig. 1) is on the south side of Montano Road and on the west side of the Harwood Lateral (latitude 35°08'21", longitude 106°38'37"). The piezometers are oriented approximately north-south and the deepest piezometer (131.5 feet) is the southern piezometer (fig. 18). The distance between the southern and middle piezometers is 17.5 feet and the distance between the middle and northern piezometers is 16.4 feet. The driller's log is shown in figure 21 and the geophysical logs are shown in figure 22. The description of well cuttings is in table 8.
Table 8. Lithologic description of well cuttings from the deepest borehole in the Montano 4 piezometer nest
[d, dry; m, moist; mm, millimeters; CaCOo, calcite; HC1, 10 percent hydrochloric acid]
MONTANO 4
Lithology
Depth intervalbelow land surface
(feet)
Clayey, silty sand; pale-yellowish-brown (10YR 6/2 d, 0-10 10YR 4/2 m) silt and clay to very fine grained sand; angular to subrounded, poorly to moderately sorted; composed dominantly of quartz with lesser amounts of mica and quartzite; strong effervescence to HC1, CaCO-> nodules to 2 mm.
Gravelly sand; dark-yellowish-brown (10YR 6/2 d, 5YR 10 - 25 3/4 m), fine- to very coarse grained sand; angular to rounded, poorly to moderately sorted; composed dom- inantly of rose and milky quartz and black quartzite with lesser amounts of mica, feldspar, pumice, granitic, and metamorphic grains; granules to 4 mm composed dom- inantly of black quartzite and quartz with lesser amounts of metamorphic and granitic clasts; few very thin, discontinuous clay films; moderate to strong effervescence to HC1.
Gravelly sand; pale-yellowish-brown (10YR 6/2 d, 10YR 25 - 55 4/2 m), fine- to very coarse grained sand; angular to rounded, poorly to well sorted; composed dominantly of rose and milky quartz and black quartzite with lesser amounts of mica, feldspar, basalt, and metamorphic grains; pebbles to 5 mm composed dominantly of black quartzite and quartz with lesser amounts of metamorphic, granitic, basalt, and volcanic clasts; minor iron-oxide stains and cementation; weak to moderate effervescence to HC1.
40
Table 8. Lithologic description of well cuttings from the deepest borehole in the Montano 4 piezometer nest - Concluded
MONTANO 4
Depth interval below land surface
Lithology (feet)
Gravelly sand; pale-yellowish-brown (10YR6/2 d, 10YR 55 - 131.5 4/2 ra), fine- to very coarse grained sand; angular to well rounded, poorly to moderately sorted; composed dominantly of rose, milky, and smokey quartz and black quartzite with lesser amounts of mica, feldspar, basalt, granitic, metamorphic, and sandstone grains; pebbles to 10 mm composed dominantly of black quartzite and quartz with lesser amounts of basalt, sandstone, granitic, metamorphic, and volcanic clasts; few very thin, discontinuous clay films and some iron-oxide stains; moderate to strong effervescence to HC1.
41
MONTANO 4
DEPTH,IN
FEETSOIL DESCRIPTION
DRILLINGRATE, INFEET PERMINUTE
DEPTH,IN
FEETSOIL DESCRIPTION
DRILLINGRATE,INFEET PERMINUTE
u -
5 I
10-
15 =
20 =
25 --
30 I
35 =
4o =
45 1
50 =
55:
60-
bb~
70-
75
SILTY CLAY WITH SAND
CLAYEY SILT
GRAVELLY FINE TO MEDIUM SAND
MEDIUM TO COARSE SAND
WITH COBBLES
SANDY GRAVEL WITH COBBLES
^ SAND
SANDY GRAVEL WITH COBBLES AND BOULDERS
FREQUENT BOULDERS
OCCASIONAL COBBLE OR BOULDER
MEDIUM TO COARSE SAND WITH SOME GRAVEL ANO SILTWITH CLAY
GRAVELLY SAND WITH COBBLES
1.0
0.6
0.4
0.6
0.2
0.6
1.8
2.0
0.8
1.3
1.2
0.8
0.6
0.5
/ J
On~~
85=
95 =
100 =
105"
110"
115-j
120-
125~
130 =
135_
140^
145 :
1 en
GRAVELLY SAND WITH COBBLES
NO COBBLES OR BOULDERS
WITH COBBLES
SILTY SAND
WITH GRAVEL
FINE TO MEDIUM SAND
WITH GRAVEL AND COBBLES
MEDIUM TO COARSE SAND WITH GRAVEL BOULDER LAYER
FINE TO MEDIUM SAND WITH SOME CLAY
GRAVELLY SAND
GRAVELLY SAND WITH CLAY
FINE TO MEDIUM SAND WITH CLAY
WITH SOME GRAVEL
WITH SOME CLAY
FINE TO MEDIUM SAND WITH SOME GRAVEL
WITH COBBLES
SILTY CLAY
GRAVELLY SAND WITH SOME CLAY
0.5
0.6
1.8
0.6
0.4
0.8
0.6
1.0
1.5
0.8
0.4
1.0
1.U
1.6
0.8
Figure 21 .--Dri 1 ler' s log of the deepest borehole in the MontarYo 4
piezometer nest.
42
u>
ELECTRIC LOG
LONG NORMA L
SHORT NORMAL
1 0 OHMS PER DIVISION
LATERALOG
10 OHMS PER
DIVISION
60
80
T 0
0
120
140
160
I E*
|
T±==
4 L=J ^rfe
1 t
'
1
GAMMA (G)
COUNTS PER
SECOND
20
40
60
SP
ON
TA
NE
OU
S
PO
TE
NT
IAL
(S
P)
50
M IL
L I
VO
LT
S
PE
R
DI
V IS
ION
I I
I
SIN
GL
E-P
OI
NT
RE
S IS
TI V
ITY
(
R )
2 0
O
HM
S
PE
R
DIV
IS
IO
N
tn i e
o
10
CA
L I
PE
RIN
CH
ES
(D
IAM
ET
ER
] 12
14
16
Fig
ure
2
2.-
-Ge
op
hysic
a1
lo
gs
of
the
d
ee
pe
st
bo
reh
ole
in
th
e°M
on
tan
o
k p
iezo
me
ter
nest.
WATER-LEVEL DATA
Water levels were measured in the piezometers at approximately 1-week intervals from February through June 1985. Water-level hydrographs of the data collected from each piezometer are shown in figures 23 through 26. Water levels generally rose in piezometers in the Rio Bravo section. This general rise in water levels did not occur in piezometers in the Montario Road section. Water-level altitudes in piezometers completed at different depths in a particular nest are about the same in the Rio Bravo piezometer nests and Monta'no 1 nest. In several of the piezometer nests, water levels generally decrease with depth, especially in the MontaTio nests (figs. 25 and 26).
Hydrologic sections of the Rio Bravo and Monta'no piezometer nests are shown in figures 27 and 28. Water levels in piezometers screened at approximately the same altitude are at approximately the same altitude in the Rio Bravo section (fig. 27). In the Montanb section, water levels in wells screened at approximately the same altitude generally are lower in the eastern piezometers (Montano 3 and 4) than in the western piezometers (Montano 1 and 2) (fig. 28).
44
WATER-LEVEL ALTITUDE,
IN FEET ABOVE SEA LEVEL
ID C -1 n> -
D O
o UD o
oo T
Ol < o ro
o tn n TJ O o s TJ r n -t o z
_ z H m a z m O » > H n o o z TJ r n -i
m X > r r o « o o s TJ r n H O Z
RIO BRAVO 34920
4919 -
4918 -
W 4917 -
4916 -
491FEBRUARY
RIO BRAVO4922
4920 -
La4918
U
* 4916
4.914
4912 I I I I I I I I
I I I I I
£=gE=3==^
\ IIFEBRUARY MARCH APRIL MAY
1985
EXPLANAT ION
SHALLOW COMPLETION
A INTERMEDIATE COMPLETION
Q DEEP COMPLETION
JUNE
[tillJUNE
Figure 2k. --Water-1evel hydrographs of the Rio Bravo 3 and Rio Bravo
piezometer nests.
46
MONTANO 14971
4966 III I I l I IAPRI L
1985
MAY JUNE
4960 I 1 1 TMONTANO 2i i i i i i r
4955 -
4950 -
FEBRUARY JUNE
EXPLANATI ON
SHALLOW COMPLETION
A INTERMEDIATE COMPLETION
Q DEEP COMPLETION
Figure 25.--Water-1evel hydrographs of the Montano 1 and Montano 2
piezometer nests.
47
4952 I I
4950 -
4948 -
4946 -
4944 _
MONTANO 3 n r
49421 I IFEBRUARY JUNE
MONTANO4944
4943 -
UI
UI
i 4942
UI
* 4941
4940
4939 I I I
i i i r
I I I I I
iifri
t t i i i
r i
I \ I
FEBRUARY MARCH APRIL MAY
1985EXPLANAT I ON
SHALLOW COMPLETION
A INTERMEDIATE COMPLETION
Q DEEP COMPLETION
JUNE
Figure 26.--Water-1evel hydrographs of the Montano 3 and Montano
piezometer nests.
48
RIO BRAVO I RIO BRAVO 2 RIQ BRAVO 4
WEST
4 9 3 0 '-
4900'-
487 O 1
WEST EAST RIVERSIDE RIVERSIDE RIO BRAVO 3
DRAIN DRAIN ... ^ ' 1 LAND SURF^i^- 1
WATER LEVEL
j -r~-^- SCREENED
I NTERVAL 1
E
EAST
- 49301
4900'
-4870'
4930 1-
4900'-
4850'-
4800'
SHALLOW WELLS
2
_
i
INTERMEDIATE WELLS
4930 1-,
4900'-
Ul QD 1- 48501-
HJ
4800 1-
4 7 7 O1-
1 1 ^-
5i
s=
DEEP WELLS
0 0.5 1 M I LE1 . 1 ...... I
I 0 0.5 I KILOMETER
VERTICAL EXAGGERATION X 41
DATUM IS SEA LEVEL
-4930'
-4900'
- 4850 1
4800'
i- 4930'
-4900'
-4850'
-4800 1
4770'
Figure 27.--Hydrologic sections of the Rio Bravo piezometers, January 15, 1985
49
MONTANO 1
WEST
RIVERSIDE
MONTANO 2 MONTANO 3 MONTANO 4
EAST
R I VERS I DE
we. s T
4975'-i
4950'-
4925'-
490 0'
r i AND SURFACE _____
WATER LEVEL
_-. SCREENED
_f 1 NTERVAL 1 : :
EAST
- 4975'
- 4950'
- 4925'
SHALLOW WELLS
4975'-
4950'-
g 4925'-
Dh- 4900'-
J
4875 1-
' \
:
: =
=
- 4975'
- 4950'
- 4925'
- 4900'
^ 4875'
n a c nl4 o Z) U - - f o ij v
INTERMEDIATE WELLS
4 9 7 5 '^
4950'-
4925'-
U
§ 4900'-
h
H 4875,'-
4850 1 -
4825'-
4800'-
r ~
(
C
^
r~~~ ~~~~~
I
£
DEEP WELLS
r- 4975 1
- 4950'
-4925'
- 4900 1
4875'
- 4850'
4825'
- 4800'
3 0.5 1 M 1 LE1 I
1 1 ) 0.5 I K 1 UOMETER
VERTICAL EXAGGERATION X 41
DATUM IS SEA LEVEL
Recommended