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HYDROGEOLOGY AND GROUND-WATER CONDITIONS'i

Stauffer Chemical Company Delaware City, Delaware

! i.

I ~+: !fll ~~ CONSULTING GROUND-WATER GEOLOGISTS· ;

I •...._•~ lj ROUXASSOCIATESINC ~ ~ 50 NORTH NEW YORK AVENUE

~---- - HUNTINGTON, NEW YORK 11743 ... - " - ·-.,.- -

AR?>0001\ •nt")nnnt I

HYDROGEOLOGY AND

~ROUND-WATER CONDITIONS

Stauffer Chemical Company Delaware City, Delaware

February 4, 1983

ROUX ASSOCIATES SO North New York Avenue

Huntington, New York 11743

ORIGINAL (Red)

CONTENTS ORIGINAL (Red) page

INTRODUCTION ••••..• . . . . . . . . . . . . . . . 1

METHODS OF INVESTIGATION

Well Drilling and Sampling .••••• Resistivity Survey. • • • • •

REGIONAL GEOLOGY. . . . . . . . . . . . SITE GEOLOGY . . . . . . . . . . . . . . . . HYDROGEOLOGY OF THE COLUMBIA FORMATION

GROUND-WATER FLOW IN THE COLUMBIA AQUIFER

GROUND-WATER QUALITY .•

SUMMARY OF FINDINGS AND CONCLUSIONS .

RECOMMENDATIONS .

REFERENCES

TABLES

. . • 3 • 6

10

15

17 --

21-

24

31

34

35

following page

1. Well Construction-Data ..•

2. Resistivity Measuring Point Interpretations ••

3. VCM and EDC Content of Ground-Water Samples . •

FIGURES

1. Site Location Map ••

2. Stratigraphic Column

3. Hydrogeologic Cross Section A-A' ..•••• -.

4. Hydrogeologic cross Section ~-B' •...

s. Hydrogeologic Cross Section C-C'.

. 4

16

25

. 1

10

14

14

· rtR·390ll4\ 3

INTRODUCTION ORIGINAL (r\ed)

Stauffer Chemical Company owns and operates a CS plant in 2

Delaware City, Delaware. Adjacent to this plant is a PVC

manufacturing facility owned and operated by Formosa Chemical

Company. This facility was purchased from Stauffer in 1981,

along with a SO acre tract of land to the south of the plant.

A 130 acre tract of land to the west of both plants is present-

ly owned by Stauffer. The combined Formosa and Stauffer

properties are surrounded on all sides by land owned by the

Getty Refining and Marketing Company which also operates a

refinery in the area. The locations of the various properties

described are shown on Figure 1.

A finding of EDC (ethylene dichloride) and VCM (vinyl chloride

monomer) in a domestic supply well in the Columbia Formation

(Alger Well) on Stauffer Chemical Company property on April 20,

1982, prompted an investigation of the source of these compounds,

their impact on the Columbia aquifer, and their potential impact

on other nearby wells. The impacted domestic wells were

immediately replaced with an alternative water supply. Roux

Associates Inc. of Huntington, New York was retained by

Stauffer to conduct this investigation. After determining

the scope of the first phase of investigation and obtaining

well drilling permits, a well drilling and sampling program

began on April 28, 1982. A review of available hydrogeologic

information was also undertaken as part of this program.

AR3000!4

- ii -

6. Hydrogeologic Cross Section D-D' •

7. Resistivity Cross Section E-E'

8. Resistivity Cross Section F-F' • . . .

PLATES

1. Well Location Map

2. Resistivity Map

3. Water Table Map (November 30, 1982)

4. Ground-Water Analytical Results

APPENDICES

A. Geologic Logs from Borings and Pits

B. Resistivity Interpretation, Part 1.

ORIGINAL (Red)

• • 14

• • 16

• 16

In Pocket

In Pocket

In Pocket

In Pocket

c. Water Levels Measured on 5/27/82, 8/10/82 and 10/13/82

D. Pumping Test Method

E. Analytical Results

ROUX ASSOCI_... INC

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SITE LOCATION MAP

PII(PAOI£0 FOil

STAUFFER CHEMICAL COMPANY Delaware City, Delaware

- 2 -OR\G\NAL

lRed) Twenty-four observation wells were installed in borings drilled

on Stauffer's Delaware City property. The wells were installed

in two phases: April 28th through May 26; and July 26 through

August 6, 1982, by J.E. Fritts & Associates, Inc. of Blackwood,

New Jersey. All drilling was done under the supervision of

geologists from Roux Associates. The wells were leveled to a

common datum by surveyors from E.H. Richardson & Associates,

Inc. Newark, Delaware and the water level in each well was

measured to +0.01 foot accuracy on at least six occasions. The

locations of the wells are shown on Plate 1.

An electrical resistivity survey was conducted in two parts by

Dr. John Kick of Dunstable, Massachusetts and Roux Associates.

The survey was run on Stauffer, Formosa, Getty and other

properties. A total of 195 points were measured. The principal

purposes of this task were to map the configuration of the upper

surface of the underlying aquitard (Merchantville Formation)

and to determine if it is absent at any locations. This

infozmation was used to help determine the locations of addition-

al monitoring wells.

All of the observation wells and domestic supply wells (Alger,

Tunison and Gray) in the vicinity of the PVC plant (Plate 1)

were sampled at least _once and the samples analyzed for EDC and

VCM by Stauffer's Eastern Research Center, Dobbs Ferry, New

York. All potable supply wells on Stauffer property are current-

ly being monitored monthly.

AR300017

- 3 - OR\G\RAL lRed)

Based on analytical results from the initial 24 observation

wells and the resistivity survey, an additional eight observa­

tion wells were drilled to the west of Stauffer's property.

These wells were installed between November 10 and 23, 1982,

by HP Drilling of National Park, New Jersey. The eight new

observation wells and two Getty wells were sampled and analyzed

during December and January. Ground-water samples were collect-

ed from 21 off-site domestic wells and four Getty supply wells

by the Delaware DNREC and USEPA and split with Stauffer. Well

locations are shown on Plate 1. The results of all analyses to

date are included in this report.

METHODS OF INVESTIGATION

Well Drilling and Sampling

All 32 observation wells installed for this program are con-

structed in the same manner. A truck-mounted mud rotary rig was

used to drill a 9-inch diameter hole through the unconsolidated

sands of the Columbia Formation into the top of the first clay

encountered, where the Merchantville is absent. Split spoon

samples were collected at 5-foot intervals or as needed to ac-

curately describe the geologic deposits at depth. The geologic

logs are given in Appendix A. Depending upon the saturated

thickness of the Columbia Formation, ten to twenty feet of 4-inch

diameter, .020 slot, PVC screen with 4-inch diameter threaded PVC

pipe was installed in the borehole. All wells were screened in the

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AR3000\~

- 4 - OR\G\Nt\l {Red)

lower ten to twenty feet of the Columbia deposits immediate­

ly above the underlying aquitard with the exception of OW-lA,

OW-17A and OW-21A, which were screened at higher intervals.

These wells were screened at or near the top of the saturated

zone in order to measure head differences and water quality

differences between the upper and lower portions of the

saturated zone of the Columbia aquifer.

After the casing and screen were installed in each borehole,

the screen zone was packed with sand of suitable grade for the

screen slot size. A bentonite pellet seal was placed immediate-

ly above the screen zone and the remaining annular space was

pressure grouted with a bentonite slurry to two to three feet

below land surface. A cement seal was poured in the remaining

few feet to land surface and a protective steel standpipe with a

lock (or in secure areas, a wooden barrier with a lock on the

PVC cap) was used to protect each well. Well construction

data are given in Table 1.

The wells were developed with compressed air immediately after

installation to remove all fluids introduced during drilling

and to insure a free flow of water from the aquifer into the

well. After this, each well was further developed with a sub-

mersible pump to remove at least ten times the volume of water

contained in the gravel pack and casing.

ROUX ASSOCIATBS INC

AR3000l9

( Table 1

Well Construction Data

Well No. Depth of Boring 1) Screen Zone 1) Elev. of Land Surface 2) Elev. of M.P. 2) E1ev. of W.T. 2) 3)

1 66.5 56-66 74.31 76.31 36.15 1A 47.0 37-47 74.63 75.63 40.74 2 67.5 56-66 71.18 72.68 35.93 3 77.0 58-68 75.09 77.09 35.27 4 53.5 41-51 72.93 75.93 37.16 5 .· 62.0 48-58 66.17 67.67 34.93 :l _,

6 32.0 11.5-21.5 51.92 - ' I 54.92 42.85 i 32.0 19-29 58.88 'I /' 61.38 44.12

(' - . 8 3 5 . 0 16 . 5-2 6 . 5 5 8 . 8 3 ·"' " .. ( 61. 3 3 4 2 . 4 5 9 24.0 13.4-23.4 57.44 ;I :' 60.44 40.51

10 35.0 23-33 62.14 I 64.64 40.38 11 32.0 20.4-30.4 56.60 11 59.10 43.47 12 65.0 52.7-62.7 66.27 69.27 35.67 13 37.0 23.7-33.7 64.90 67.40 40.14 14 47.0 32.3-42.3 66.62 68.62 36.32 15 57.0 45-55 56.65 58.15 35.16 16 5_2_._0 35-45 46.55 48.05 33.36 17 I :r:a 55.0 . --- ·-40-~-65-50.65 . - . ·-66. 79 68.79 36.07 17A '=o 43.5 33.1-43.1 66.46 67.96 36.14 18 ·~ 17.0 5.0-15.0 33.83 35.83 32.32 19 ~ 35.0 20.5-30.5 51.58 52.58 38.33 20 CJ 45.0 30-40 63.10 64.60 34.34 21 N 45.0 27.6-37.6 68.31 69.81 35.13 21A o 30.0' 20-30 68.54 69.54 Dry 22 80.0 45-65 59.03 60.63 32.68 23 11.0 40-60 53.08 54.68 34.52 0 24 76.5 42.3-62.3 58.64 60.44 35.96 ~ 25 66.5 40-60 67.80 69.60 36.38 ~0 26 81.5 49.5-69.5 69.64 71.44 35.36 ~~ 27 87.0 53-74 69.58 71.28 32.23 -- ~ 28 75.0 45-65 62.97 64.57 31.26 29 82.0 52-72 74.51 76.32 35.14

MP = Measuring Point (top of PVC casinq) 1) feet below land surface 2) feet with respect to sea level (NGS Datum) AOUX~..C 3) Measured on November 30, 1982

- 5 -

Reference points on all wells were leveled to an accuracy of

+0.01 feet with respect to mean sea level. Water levels in the

wells were measured with an electric probe to +0.01 feet from

the reference point.

Water samples were collected from the wells with a stainless

steel bailer. Prior to sample collection, each well was purged

with a submersible pump to remove at least five casing volumes

of water. After purging a well, the pump was removed and wash-

ed with tap water prior to purging the next well.

In addition to the installation of monitoring wells in the

Columbia aquifer, four deeper test borings were completed.

These borings penetrated the underlying Merchantville Formation

and split-spoon samples were collected at least 30 feet into

deeper formations. After completion, each boring was sealed

with a bentonite slurry to seal off the Columbia aquifer from

deeper aquifers. The locations of the test borings are shown

on Plate 1.

In an attempt to investigate a possible source area of VCM and

EDC, eight test pits were dug on Stauffer Chemical Company

property. The pits were dug with a backhoe to a depth of

approximately eight feet. Sediment samples from these pit~ R 3 O 0 0 2 J

AOUX ASSOCIATES INC

- 6 -ORtG\NAL

(Red) were collected and analyzed for EDC and VCM by Stauffer's

Eastern Research Center. Geologic logs of the test pits

are included in Appendix A and their locations are shown

on Plate 1.

Resistivity Survey

An extensive resistivity survey was undertaken on and around the

Stauffer property to determine the best locations for future

borings and to help define the stratigraphy in the areas between

borings. Electrical earth resistivity is an indirect method for

determining subsurface geological conditions. In many cases, it

can be used to measure the depth and thickness of a clay layer

underlying a sand layer. For this investigation, knowing the

depth and thickness of the Merchantville Formation and other

low permeability layers throughout the study area is necessary

to the understanding of ground-water flow.

The resistivity survey was undertaken in two parts. The first

part was conducted by Dr. John Kick of Dunstable, Massachusetts

and included a feasibility survey made on June 3 and 4, 1982 which

showed that the interpretation of six electrical soundings was

consistent with geologic information from nearby borings. Based

on these results, it was considered feasible to use resistivity

soundings to map the extent of the Merchantville and other low

resistivity (clay) units. The remainder of the first resistivity

study was run during the period July 5 to August 3, 1982. A

total of 132 points were measured during this part of the survey

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AR300022

--· - 7 -

and their locations are shown on Plate 2.

OP'~rr:AL ((.~~)

The second part of the resistivity survey, consisting of 63

points, was run by Roux Associates personnel and Dr. J. Kick

during the period November 17 to December 10, 1982. The

locations of these points are also shown on Plate 2. (A few

points are beyond the area shown on the plate, but their

locations are not important for the purposes of this report.

A Bison 2 3SOB Earth Res is ti vi ty System was used for both parts

of the survey. The Wenner electrode configuration was used

exclusively. For most of the soundings, the maximum electrode

spacing was 300 feet.

The resistivity method is successful because subsurface sediment

layers commonly exhibit contrasts in electrical resistivity that

can be detected from the surface. Most resistivity systems are

made up of two pairs of electrodes, a power source and measuring

apparatus. One pair of electrodes introduces current to the

ground and acts as a transmitter. The second pair of electrodes

samples the resulting potential pattern and, therefore, functions

as a receiver. Knowledge of the current, potential and particular

electrode configuration used allows computation of the average

resistivity of the volume of ground sampled. The resulting

averac:re resistivity is known as "apparent resistivity".

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Apparent resistivity readings can be made for a series of electrode

spacings varying from a few feet to several hundred feet. With

each increase in electrode spacing, an increasingly larger and

deeper volume of ground is sampled so the method is commonly

termed electrical sounding. The results of a sounding, plotted

as a curve of apparent resistivity vs. electrode spacing, is

termed a sounding curve. The shape of the curve reflects the

change of resistivity with depth and, therefore, changes in

the nature and thickness of sediment layers. The sounding

curve can be analyzed and interpreted by use of a variety of

methods to yield thickness and true resistivity of subsurface

layers.

Data from the field was tabulated and plotted as curves of

apparent resistivity versus electrode spacing ("A" spacing) on

Bilog graph paper. ·The curves were analyzed with a US Geological

Survey program that calculates theoretical Wenner vertical

electric soundings for structures of up to 10 horizontal layers.

The procedure of interpretation can be briefly explained as fol-

lows: an initial theoretical sounding curve is calculated by

assuming a model made up of a sequence of layers and correspond­

ing resistivities. The assumptions are constrained by values

from the field curves and boring logs. The calculated curve is

compared to the observed curve and differences are noted. A

second theoretical curve is then calculated using model parameters

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AR300024

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(Red)

that are likely to minimize the difference between the observed

and calculated curves. The process is repeated until the cal­

culated curve is sufficiently close to the observed sounding

curve. The resulting model is interpreted in terms of geological

structure and materials.

An alternative analytic technique called the Barnes Layer

Method, was also used to analyze Part 1 data. It provides a

rapid means of computing approximate resistivity value~

shows trends and does not involve operator judgement in the

process. The. Barnes Layer Method, therefore, complements the

computer modeling. The method uses a semi-empirical formula

to compute approximations of true resistivity and layer thick-

ness from field sounding curves. Barnes layer resistivities

were of the same magnitude as the computer generated true

resistivities and thus supported the modeling interpretations.

A TI-59 programmable calculator was used for analysis of the

Part 1 survey data. Because of the large number of data

points, however, this instrument proved to be too slow to

allow the desired number of trials to be made within the time

available for interpretation of the Part 2 data. To increase

the speed of interpretation, the analytical program was

translated into Basic and an Apple II + computer was used to

analyze Part 2 data. The findings of the resistivity survey

are discussed in the following section on regional geology.

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- 10 -

REGIONAL GEOLOGY

The area of investigation is part of the Atlantic Coastal Plain

physiographic province and is underlain by southeasterly dipping,

unconsolidated sedimentary strata of cretaceous Age. These

deposits are covered by a thin veneer of Pleistocene sediments

(Pickett, 1970). A stratigraphic section of these sediments,

constructed from the log of an existing Getty well in the area

(G-1), is shown on Figure 2.

The Cretaceous deposits mantle the irregular surface of the

crystalline bedrock and have been locally divided into three

formations. The oldest or deepest deposits are called the

Potomac Formation. The Potomac consists of silt and clay beds

with sandy layers or lenses that serve locally as aquifers.

The sand bodies have a shoestring channel form and were most

likely deposited by unidirectional currents (Spoljaric, 1967a).

Since the Potomac Formation was deposited in a fluvial environ-

rnent, geologic deposits varied considerably in sediment character

over short distances. It is very difficult, therefore, to cor­

relate individual sand or clay beds from one well log to another.

-The Potomac Formation is an important source of ground water in

the area surrounding the Stauffer property. Getty Refining and

Marketing Company has pumping wells [G-1 (DC-51-7), G-2 (DC52-24)

and G-4 (Eb-15-4) shown on Plate 1] in the Potomac Formation

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AR300026

- 11 - ORIGINAl (Red)

adjacent to the area of investigation. An examination of

logs from these wells and observation wells to the west of the

study area, indicates that weathered bedrock occurs at approx-

imately 600 feet below land surface (Figure 2). This indicates

the Potomac Formation is approximately 540 feet thick in the

study area. The well logs also show seven beds (or lenses)

of clay or silty clay greater than twenty feet in thickness

that dominate the Potomac. The sand lenses encountered

between the clay layers are generally thinner than the clays.

The sand layers divide the Potomac Formation into three zones,

the Upper, Middle and Lower.

-~ Getty has no pumping or observation wells in the Upper Potomac

Formation ~n the vicinity of the PVC plant. This is apparently

because the Upper Potomac in ·this area consists almost entirely

of variegated clay and silty clay. Well logs from Getty wells

penetrating the clay indicate that this upper clay layer varies

from 60 feet to 130 feet in thickness.

Getty has a pumping well (G-2) screened in the Middle Potomac

(approximately 200 to 240 feet below sea level). An observa­

tion well (G-3) screened in the Middle Potomac is present north

of the railroad tracks near the northwestern corner of the

Stauffer property.

Stratigraphically overlying the Potomac Formation within a

AOUXASSOCI....SINC

AR300027

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WIATHU!D a!DitOCK

AR300028

r-------r-·-·--LAND SURFACE

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SILT AND CLAY

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Upper Potomac Formation·

Middle Potomac Formation

Lower Potomac Formation

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8TR.ATIGRAPHIC COLUMN

(FROM DRILLERS LOI OP W!LL 1-1 )

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STAUFFER CHEMICAL COIII,ANY Dolo wore Cltr, Doloworo

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- 12 .

(q, . '~;AL (Red)

portion of the area C·f inv.!stigation, is a lc.yer of white,

"sugary" fine-grained sand which fits the description of the

Magothy Formation (Pickett, 1970). The test borings indicate

it is present at TB-1, TB-2 and TB-3. Well logs from TB-1

and TB-3 indicate thicknesses of ten feet at both locations

with Potomac clay immediately below and Merchantville

immediately above . At TB-4, the Upper Potomac

clay directly underlies the Columbia Formation and

both the Magothy and Merchantville are absent.

It is difficult to match descriptions from drillers' logs of

Getty wello in the area to the logs of the test borings. It

appears, however, that at G-1 and G-3, Potomac clay directly

underlies the Columbia Formation, whereas at G-4, approximately

40 feet of Magothy underlies the Merchantville and overlies

the Potomac Clay.

It is possible that the sand layer identified here as the

Magothy may in fact belong to the Potomac Formation. The

interpretation as Magothy is based on m:;.neralogy and texture.

The Magothy is a quartz sand deposited i~ a high energy offshore

marine environment where current action s"lrted sediment, whereas

the Potomac sands reflect deposition in a fluvial environment

and are more variable in composition and less well-sorted.

Pickett (1970) shows the subcrop area of the Magothy pr~sent to

ROUXASIIOCI_..WC

l\R300029

- 13 -, INAl

•. ,."d)

the north and west of the PVC plant though it is discontinuous.

As far as could be determined, there are no pumping wells that

tap this formation in the area.

Above the Potomac and Magothy Formations over most of the area

of investigation is the Merchantville Formation which belongs

to the Matawan Group of Upper Cretaceous Age. A hiatus in the

geologic record exists between the Merchantville and underlying

formations. Unlike the Potomac Formation, but similar to the

Magothy, the Merchantville was deposited in a nearshore marine

environment. This environment, however, was much lower energy

than the environment in which the Magothy was deposited, which

accounts for the differences in sediment types.

The Merchantville Formation consists of greenish-gray c.1a·yey silt

with clay, locally abundant, filling in the burrows of benthic

organisms. Well logs from borings and Getty wells

indicate that the Merchantville is not present in the

northern and western parts of the area of investigation where

clays of the Potomac Formation were found to immediately underly

the Columbia (at OW-22, OW-23, OW-24, TB-4, G-1 and G-3). Where

present, the Merchantville varied in thickness (at TB-1, TB-2

and TB-3 thicknesses were 15, 26.5 and 13 feet respectively).

At G-4, based on a driller's log, the Merchantville i:s

estimated to be at least 25 feet thick.

The Merchantville Formation has a low permeability and thus

ROUXASSOCIMniSINC

t\R300030

- 14 - ORIGINAL (Red)

serves as an aquitard which hydraulically separates the sands

of the Magothy and Potomac Formations from the overlying

Columbia aquifer. Where the Merchantville is absent, clays

of the Upper Potomac are present directly below the Columbia

and serve the same purpose. All evidence from this investi­

gation indicates that the Columbia is continuously underlain

by an aquitard.

During Pleistocene times, channels were scoured into the

Merchantville and it is possible that portions of the formation

have been completely eroded away, exposing the Magothy or Upper

Potomac to the Columbia Formation. Breaches or windows through

the Merchantville Formation, if they do exist, would occur in

the deepest part of these channels. If a breach does exist,

the Columbia would be hydraulically connected to the Magothy in

places, although the upper clay layer of the Potomac Forma-

tion should prevent any further downward movement of water.

Overlying the irregular topography of the Merchantville is the

Columbia Formation which is Pleistocene in age (Figures 3-6).

The·columbia Formation in northern Delaware consists of quartz

sands with minor interbeds and lenses of gravel, silt and clay.

The formation was deposited in a glacio-fluvial environment when

melt water from a stagnating or receding glacier formed a network

of rivers and streams that brought in sediment from the northeast.

ROUXA.SSOCIAimiiNC

AR300031

- 15 -

These sediments were continuously reworked by current action.

During extended periods, river waters flooded the entire

study area, whereas at low water periods, rivers were confined

to the north-south trending channels cut into the Merchantville

and interchannel areas were exposed.

SITE GEOLOGY

The thicknesses of the Columbia, Merchantville and Magothy

Formations in the study area have been determined at a number

of locations by the well and boring logs. To help locate new

wells and to better extrapolate information between wells, the

resistivity survey was conducted. The first part of the

resistivity survey (points 1 through 132) was interpreted by

Dr. J. Kick. These results are described in Appendix B.

The resistivity interpretation of the Part 1 data proved to

accurately depict the upper surface of the Merchantville under

the Stauffer property, but failed to do so in the area to the

west of Route 13 where no borings existed at the time. After

completion of additional resistivity measurements in November

and December 1982, and with the benefit of logs from wells

OW-22 to OW-29 and deeper borings, TB-1 to TB-4 (Plate 1), the

resistivity data were reinterpreted.

The major discrepancy between the earlier and newer interpretations

ROUX ASSOCIAT'IIS INC

AR300032

- 16 -ORIGINAL

(Red)

is the configuration of the LRL (Low Resistivity Layer) when it is

interpreted as the uppermost low permeability layer (Merchantville

Formation or, where the Merchantville is absent, Upper Potomac

Clay). Figure B-1 in Appendix B shows the LRL as originally

interpreted. Plate 2 shows the upper surface of the shallow

aquitard as interpreted from all of the well and boring logs

including the reinterpretation of Part 1 data. Table 2 shows the

elevation of the LRL and thicknesses of the various formations

as interpreted from the resistivity data. As shown on Plate 2,

the aquitard does not continue to slope steeply downward to the

west of Route 13 as previously thought, but flattens out and at

approximately 1200 feet from Route 13, begins to slope upward

again. Cross sections through this area based on resistivity

data are shown on Figures 7 and B.

The Merchantville becomes thinner in the area west of Route 13

and is underlain by a layer of sand (Magothy) • Beneath the sand

layer is a clay layer interpreted as the Upper Potomac clay

(Figure 7 and 8). The original interpretation of the contours

of the LRL followed the upper surface of the Merchantville Forma-

tion under the Stauffer property as confirmed by the drilling

program. However, on the west side of Route 13, where the

Merchantville is thinner, the resistivity survey did not detect

it. Rather, it included the Merchantville as part of the

alternating layers of sand, silt and clay found about it and

interpreted the Upper Potomac Clay as the LRL.

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TITLE

HY D ROG EO LOGIC

CROSS SECTION

Silty

Ctay

8'

aooFT.AR3QQQ35 ._ ____ .._ ____ ..1 PREPARED FOR

STAUFFER CHEMICAL COMPANY Delaware City, Delaware

ROUX ASSOCIATES

SCALE SHOWN

DATE OCT 1982

4

l

l

-~ ~

0

~

' ~ ~

< • 0: u > •

0 •

----+<>~

0 • 0

" {1S~ iU.:i) N01J:9'1\:i13

I z 9 I r •

I • • ~

w

" = > " . z

I • u % u

I • w . •

0 0

z • 0 ;:: • • u • ... "'' • rn M o•

0 v ~ rn • .. 0 "' 0 0 • • Q: M u

0

u a: - . cr ••

!::! w.:; %

"' u 0 ..J • 0 w ... • "' • 0 , Q: • 0 " >- • :z:

. ~

. I

I' '!,

' :.. •

-;t_ I II ~l1 11 tl

I; [I I I':: I ; It II I u I· I I[ II ~II I 11 I I u

,',If II ~Ill I l 1 1 1ll11~ I

1,' :,,, 1,,,, 111

:1 I !IIIII

0 N

' 0

"

'·ttl

• • -~. ~ .. ~

~lai~ ! ... •Q " .. ; :j ~0. ~ :u ~

~I-:. '' ·' !•

~ l !i !;:tl ol( 0:-u

~

. . . <

! ~ u . . • . • . ; w r 0 z

• •

Table 2 - Resistivity Measuring Point Interpretations

Resistivity Measuring Pt:.

7

8

9

10

11

12

13

14

15

16

17

18

19

20

22

23

24

26

27

28

29

30

31

Thickness of Collllllbia For­mation (ft.)

35

65

53

38

51

28

10

7

27.5

31

36

46

47

48

36

39

29

34

22

31

56

55

57

l!:lev. of Low Resist. Layer (ft. MSL)

36

4

10

21

9

22

35.7

33

17.5

20

25

14

6

7

3

20

34

29

28

33

7

8

2

Thickness of Low Reabt, Layer (ft.)

+

+

80

60

70

60

50

140

200

so so

+

+

+

+

+

+

100

40

+

+

+

+

ORIGINAL (Red)

Thickneu of Deeper lligh !!!,!.!_st. Layer (ft.)

+

+

+

+

+

+

+

+

+

+

+

Note: + - deepest layer defined by the resistivity, thickness not known.

OR!GINAL U<cd)

Table 2 - continued Thlckn .. a of Blev. of Low Th1ckneaa of Thickness of

Reaiat1v1ty Columbia Por- Reaiat. Layer Low Reaht. Deaoer Hl9h Measuring Pt. mat1on (ft.) (ft. MSL) Layer (ft.) Redat. Layer (ft.)

32 55 10 50 +

33 38 22 +

34 32 31 +

35 25 32 60 +

36 19 28 60 +

37 27 28 60 +

38 20 33 40 +

39 19 31 40 +

40 13 33 +

41 15 35 +

42 17 26 60 +

44 56 -9 +

47 84 -26 +

48 47 13 +

49 90 -36 +

50 89 -20 +

51 73 -7 40 +

52 67 -5 +

53 46 7 +

54 38 5 +

55 83 -21 +

56 86 -33 +

57 79 -10 +

58 86 -17 +

59 71 -1 +

60 95 -33 +

AR300038

ROUX ASSOCUriWSINC

C:C'GINAl Table 2 - continued (i\ed)

Thickness of 1: lev. of Low Thickne .. of Thickness of Resistivity Columbia For- P.eaiat. Layer Low P.eaiat. !leeper Hiqh Measuring Pt. mation (ft.) (ft. MSL! Layer (ft.! !'.e:Jist. Layer (ft.!

61 43 13 +

62 47 19 +

63 51 10 +

64 40 l8 +

65 46 7 +

66 47 4 50 +

67 74 -12 +

68 79.5 -17.5 +

69 67 -13 +

70 77 -17 +

7l 10 33 50 +

72 24 29 60 +

73 46 -9 +

74 49 -2 +

75 64 -12 +

76 48 -1 +

77 34 2 +

82 69 -4 20 15

83 58 7 22 20

84 66 -2 20 40

85 60 4 25 30

87 54 -2 25 20

88 62 -7 10 10

89 79 -9 15 10

90 74 -1 15 10

91 64 -1 20 25

92 46 7 20 20

t\R300039

ROUX #I.SSOCIATIIS INC

O:l!GINAL Table 2 - continued (Red)

Thickne .. of Elev. of Loot Thickneu of Thickneu of Redstivity Columbia For- Resist. Layer Loot ... tat. Deeper RiCJh Measuring Pt. IIAtiOn (ft.) (ft. MSL) Layer (ft.) Resist. Layer (ft.)

93 52 -2 20 30

95 74 -4 20 25

97 78 -5 15 10

101 61 1 10 10

102 65 0 15 10

103 69 -3 25 30

106 46 11 +

107 38 13 80 +

108 38 18 80 +

109 34 19 75 +

110 33 18 60 +

110 34 ll 80 +

112 57 -3 +

113 65 2 +

114 56 4 +

115 55 -19 +

116 63 -16 65 +

117 18 17 80 +

118 87 -31 +

119 74 -21 +

120 69 -13 +

122 51 2 +

123 20 l3 +

124 17 12 7 +

125 21 14 70 +

126 22 23 80 +

AR300040

ROUX~INC

Table 2 - continued ORIGINAL (Red)

Thickness of Elev, of Low Thicl<neu of Thicl<enaa of Resistivity Colwabia For- Resist. Leyer Low Reaist. Deeper High Measuring Pt. mation (ft,) (ft. MSL) Layer (ft.) Resist • Laxer (ft)

127 22 22 80 + 128 71 -o.s 25 20 129 62 2 5 5 157 48 12 25 20

158 27 33 + 165 61 4 25 30

166 33 22 20 30 167 42 17 20 30

168 68 -5 20 30

169 57 2 25 20 170 12 18 10 20 173 19 27 + 174 8 38 + 178 23 50 50 +

-- 179 37 56 20 5

180 29 25 +

181 40 12 +

182 17 57 50 +

184 67 -31 +

185 85 -27 +

186 49 -16 +

188 34 0 +

190 7 29 20 40

191 22 20 40 +

AR300041

ROUXASSOCUn'ESINC

'

Table 2 - continued o~rGrr:Al '" od) \ ~·-

Thickne .. of l!lev. of LOw Thickneu of Thickne .. of Resistivity Columbia For- Resist. Layer Low !'.eaiat. Deeper High Measuring mation (ft.! (ft. MSL) Layer (ft.) Resist.Lal!er

192 21 23 30 +

193 51 1 30 20

194 47 -5 3~ +

195 49 -3 20 30

196 65 -15 +

199 15 29 +

200 35 -0.5 +

201 42 11 +

202 39 3 100 +

203 37 10 +

204 20 26 !00 +

207 21 12 +

208 74 -7 + +

214 47 7 +

Note: Several measuring points shown on Plate 2 could not be satisfactorily interpreted and have been omitted from this table.

AR3000~2

z 0 >

• ' <D

.... ("') • ~: •

~

• a

CI)O o• • 0 C) 0~ I CI)Q •

I Cl) ("') ' •! n; 0 0::' •• I

0 ;:: :;: . ~c:t 0 : i ..

.... ~i

·~ i .. ..,U ~~

I <> • "' o:

c:o

0 • .J . : 0 •; ';' .. oO ":! "' ::>,_ 0 , oc a: .. 0:-

u 0 " 0 .. • .. .. ~ :z: c

I

0 0

;r ~ l

I • l 0 I . I I I I I I

z 0

" •

I • • 0

• • - ~

I -> -" , z . I

• • • 0

• • . •

a

... cr:+--Ql --;------ u

.---i· West

" • • . " • ~

• >

~

,

,.

3~t--

,_

_,_

'

-45

-60

TB~J

@, ®

TB-2

@

----r!!'- ...__ "'

.00

t c .......

'()QQ

t

""" - t Columbia

t = ColulfiDoo I

t ••oo I t ·~

·~

I "00

J., zooo

+ -- i--'~t __ -- ; M"ellantvillt

400 '·t-•-J__ I--- ' t j r- 1 ----i •w I •oo """'"'"" i ~;T·:~"~;_-- ']. __ -------+-- --- --- _, -, ' ' --- ' :-·:_ -_ J..... .!. -

....... -- __ , I - -- .

' ' ? ? Z50

Potomoe!

OW-l$

-- ---

Colurnboo

OW-IT

·~· I Columtuo

E' East

00

I l '"""~'" "00 lJ ____ J --------~:.. .. :. -~ Mtrchontvdlt -·- -

Mtrchantvollt I

I I

'"

o 400 lOOFT

{

ORIGINAL (Red)

-EXPLANATION-

@

-'-

.... OW-l 7

T 8-J

Po!omoc

SoundonQ Number

SoundonQ Locoloon

Rnistiv111 Volut (Ohm-Ft)

Rttotfovtly Layer Contacts

Oburvotion Wtli

Ttsl Borinc;~

Feu motion At Loo;u•d AI Bori flo;J

RESISTIVITY CROSS SECTION

E- E'

AR3000 STAUFFER CHEMICAL COMPANY

ROU ASSOCIATE

Otlowort Cdy, Ottowort

·-··-!_ ~_!:MUll-IS

'

"

.,

"

" ; 5 f-. . . z 9 " ~ -15 f-" •

1\iorth

@ @ ® rs-2@ 15

--;ooj~--.l""''~ ® ~~ __ l"f=-----!." ----- - ---,' _____ l ___ •too •ooo ® ---- ·~ .. ~ t

ORIGI.':~l (Rell)

F' South

OW-28

® OW-22 --- t t T - -., ® / - - - f ---f t t"" f .... t Jt _____ ·t --- -1 ~--------.... i 1~-----•--,;,J;;-'-

Columbia

-· • -· ••• • ---

0

_ ·r _ ~-...... I . 0 I •• •

--r-- -----t--- ------ - - --------,_- 1 1

Potomoc:

-EXPLANATION-

@ Sound•nQ Number OW-22

--l_ SoundiiiQ LQC:OIIOII TB-2

)000 R"illivit~ Votue(Ohll'l ·Ft.) 6-1

---- Reailfivil~ Lo,er Contoc:t• Potomac

·~ 100fT

1 . __ ,_

'" ~-- --- _,_- . t- -- zlJo ',j e~ l ---- 1~0 ' - -.!, - '\' "':t"'' --------

- ·~ ---0 ?- -?

Potomac: I

Ob1ervation Wttl

Tnt Bonne;~

Gett~ Well

Formollon A• !..oQQtd At 8orinQ AR300045

RESISTIVITY CROSS SECTION

F- F'

........ "'"" STAUFFER CHEMICAL COMPANY

Oe1owor1 Citr, Del ow ore

~ •·_ ,. '' J 0( ~A~TIIol5 •-• •• •1

ROUX . .-:-,.,-,-;------- C~rOft""~- 8 ASSOCIATE · · "-· p ~ou•

- 17 -ORIGI~i.~d.

(Red)

Figures 7 and 8, based on the latest resistivity interpretations

and well logs, show the configuration and thickness of the Mer­

chantville Formation, and the position of the Magothy sand and

Upper Potomac clay. The resistivity values for each of these

layers are shown on the figures. The new interpretations are

felt to be more representative of actual conditions than the

original interpretations, primarily due to better control (more

borings).

The resistivity survey has helped confirm the continuity of the

Merchantville ·and/or Potomac clay under the entire study area.

It has also demonstrated that the Potomac clay layer is contin-

uous under the Magothy sand layer that is present in the western

portion of the site. This information greatly increases the

confidence with which geologic strata can be projected between

wells.

HYDROGEOLOGY OF THE COLUMBIA FORMATION

The drilling and sampling program described in this report has

concentrated on the Columbia Formation because this is the

aquifer that was found to contain EDC and VCM. Therefore, the

following detailed hydrogeologic discussion covers only this

aquifer and the top of the underlying aquitard (Merchantville

Formation or Upper Potomac clay).

AR300046

ROUX .AS80CIR1!SINC

- 18 - ORIGINAL (Red)

Based on the current investigation in the study area, the

Columbia Formation can be divided into a series of units based

on sediment character (Figures 3-6). From youngest (shallowest)

to oldest (deepest), they are:

Unit A

Unit B

Unit c

Unit D

UnitE

reddish-brown, poorly sorted, sandy and

silty clay and clayey sand

orange-brown, well-sorted, fine to medium

sand

alternating layers of orange, coarse sand

and pebble gravel; orange, fine to medium

sand;and light gray or red clay

light orange, medium to coarse sand

brown clay overlying quartz pebbles and

cobbles

Unit A consists of sandy clay and clayey sands that form a thin

veneer over the area west of the PVC plant. The sand grains

consist of predominantly quartz with 20% immature minerals, such

as feldspar, muscovite and amphibole with rock fragments of chert

and mafic igneous rocks. This unit is thinnest near the PVC

plant area, and reaches a maximum thickness of 7 feet at several

well locations to the west. Unit A is likely alluvium deposited

when a river, perhaps the ancestral Dragon Run, flooded its banks.

The abundance of slightly weathered feldspar and micas suggest

rapid burial.

AR300047

AOUXASSOCIATIES INC

- 19 - ORIGINAL (Red)

Unit A differs from the underlying units because of the

abundance of clay, percentage of immature minerals and rock

fragment~ and generally poor sorting of grain sizes. Because

of the abundance of clay-size particles and tight packing,

Unit A serves to restrict downward infiltration of precipitation

to the water table.

A sharp contact .is present between Unit A and Unit B which consists

of well-sorted, £ine to medium quartz sands with an occasional

bed of poorly sorted, coarse sand and granules. Though Unit B

is above the regional water table over most of the study area,

its importance is that it readily allows the percolation of

surface water to the water table.

The fine sand of Unit B contains thin laminations of dark

minerals, such as zfrcon, garnet, magnetite, and amphibOle.

Unit B was probably deposited as channel and overbank deposits

when rivers draining the glaciated areas were at full capacity.

Unit B grades into Unit C which consists of alternating layers

of poorly sorted, coarse sand with granules and pebble gravel~

fine, silty sand; and clay. This unit was deposited in a

fluctuating environment. The coarser sands and gravels may

represent braided channel deposits and the silty sands overbank

deposits. The thin clay layers and thicker lenses (OW-3) may

AR30004~

AOUX ASSOCIAniSINC

- 20 - ORIGINAL (Red)

represent deposition from standing water (perhaps at a cutoff part

of the channel) or a temporary lake. An occasional quartz cobble

is found embedded within the thicker clay lenses, perhaps falling

from a melting ice raft.

Unit C is present at all sites (Figures 3-6), but is thickest

near the PVC plant where gravel beds dominate sand and clay

beds. It is thinnest at OW-l where a channel was cut into it

and the fine sands of Unit B subsequently deposited. Unit C

again thickens to the west (across Route 13) where the gravel

layers become thinner and fine silty sands dominate the sequence

with thicker lenses of clay present (Figures 3 and 5).

Unit C, as a whole, is anticipated to have a high permeability

due to the abundance of gravelly and sandy beds as opposed to

silty and clayey bed-s. However, the permeability will be

greater horizontally than vertically due to lenses of low

permeability sediments, such as clay, at particular horizons.

Unit D consists of light orange, medium to coarse sand and is

encountered to the west of the PVC plant (Figure 3, 4 and 5).

This unit fills depressions and channels scoured into the Mer­

chantville Formation. The sands are well-sorted and contain

laminations of heavy minerals and disseminated pebbles of

quartz, chert,and both felsic and mafic igneous rock fragments.

AR300049

ROUXASSOCIJn'ESINC

- 21 -

The oldest unit of the Columbia Formation delineated in

ORlGINf.l (Red)

the

study area (Unit E), is a thin but resistant layer of brown

clay overlying cobble and pebble gravel. The cobbles consist

of quartz and chert. Though this unit is very thin, it appears

to be laterally persistent (Figures 3 and 6) • Unit E was

deposited on the erosional surface of the Merchantville and the

gravel may represent a lag deposit, as finer grain sizes initially

deposited were put into suspension by current action. As the

currents waned, the finer particules settled out immediately

above the gravel.

Where encountered, the Merchantville is a greenish-gray, clayey

silt with thin lenses of glauconitic sands and is particularly

clayey where burrows of marine organisms were abundant. This

formation has a low permeability and serves as a regional

aquitard which restricts the downward movement of ground water

from the overlying Columbia Formation into the underlying Magothy

and Potomac Formations.

GROUND-WATER FLOW IN THE COLUMBIA AQUIFER

Water-level measurements obtained from all the OW-series wells

on November 30, 1982 were used to compile a water table map.

Additional water-level measurements taken at different times

are included in Appendix c. AR300050

ROUX ASSOCUD1ESINC

- ____ ___j__

- 22 - ORIGINAl (Red)

Plate 3 shows a mound in the water table under the western

portion of the PVC plant property. Ground water flows from the

area of this mound in all directions. Ground water containing

EDC and VCM is flowing west from the area of the PVC impound­

ments. Ground water flowing to the northwest toward OW-5 turns

in a northerly direction (roughly parallel to Route 13) and

flows toward Red Lion Creek. Ground water flowing from the

PVC plant toward.OW-16 turns in a southerly direction and flows

to Dragon Creek.

-;dThe observed directions of ground-water flow in the Columbia

aquifer cannot be explained based on surface topography and

stream elevations alone. Also, there are no pumping wells in

the Upper Potomac or the Magothy in the area of investigation

that would be likely to influence flow in the Columbia. Getty

well G-2 is the neare.st pumping well screened in the Middle

Potomac (302-332 feet below land surface). G-2, however, is

located to the east (opposite of the direction of flow of ground

water containing EDC and VCM) • Getty has one pumping well (G-1)

downgradient of the study area (Plate 1). However, this well is

screened at the intervals 416-439, 454-474 and 534-544 feet below

land surface, which places the screened sections in the Lower

Potomac Formation. !t is not likely that this well will influence

ground-water flow in the Columbia, because of the great depth and

multiple confining layers, including numerous clay layers within

the Potomac. nR3000SI

ROUXASSOCI.vBSINC

- 23 - C' ' 'l ~ ~' ') • 1 ··\

(Re<!)

The configuration of the water table (Plate 3) may be explained

by the topography of the Merchantville, permeability differences

within the Columbia aquifer and the addition of water to the

aquifer from impoundments in the western portion of the PVC

plant property. Ground water flows from a topographic high in

the Merchantville (Figures 3 and 5) towards a north-south trending

relict channel where more permeable sands in the lower Columbia

serve as natural. drains. The area of investigation is located

in a previously recognized channel scoured in the Merchantville

{Spoljaric, 1967b). Ground water emanating from the PVC plant

impoundment area flows westerly into this north-south trending

channel. The upper surface of the Merchantville comes up gently

to the west thus correlating with water level data. Figures 3,

5 and 6 indicate that the upper surface of the Merchantville

comes up again at the western edge of the area of investigation.

Within the Columbia aquifer on Stauffer property, there is a

downward component of flow as would be expected in a recharge

area. This is apparent by the vertical hydraulic gradient of

0.24 ft/ft between OW-l and OW-lA as measured on November 30,

1982, indicating a significant component of flow from the

upper to the lower horizons of the aquifer. The underlying

Merchantville will restrict movement of ground water into

deeper aquifers.

I\R300052 To estimate ground-water flow rates in the Columbia aquifer,

selected wells were pumped at a low rate (10 gpm) for 15 minutes

ROUXASSOCI..-.siNC

- 24 -

and drawdown was measured. In this way, transmissivities were

calculated as described in Appendix D. Values of transmis-

sivity varied from 5,000 to 8,000 gpd/ft for the off-site

area (OW-23 and OW-26 through OW-29). Wells closest to the

PVC plant (OW-6 through OW-10) went dry during pumping, in-

dicating a lower transmissivity than the other wells, although

actual transmissivities could not be measured. Transmissivities

lower than 5000 gpd/ft near the PVC plant are consistent with

the finer-grained sediments observed in the cores taken at the

individual borings. Based on these estimated transmissivities

and the measured gradients, the ground-water flow rate in the

Columbia is estimated to ranged between 0.3 and 1 foot per day.

GROUND-WATER QUALITY

Ground-water samples for this investigation have been collected

from the OW-series of wells, the MW-series of wells on the

Stauffer and Formosa plant properties, and from off-site domestic

supply wells screened in the Columbia aquifer (Plate 1). In

addition, samples were collected from five Getty supply wells

screened in the Potomac aquifer. Selected wells have been re-

sampled and analyzed a second time to confirm the first result.

The results of analyses of these samples are discussed below.

Ground-water samples were collected from the on-site domestic

supply and OW-series wells (as they were installed) on M~O:A9 53

May 6 and 7, May 25 and 26, August 18 and 19, November 30, 1982

ROUX ASSOCI.Cr.a INC

- 25 -ORlGHlAL

(Red)

and January 11, 1983. Prior to sampling, five to ten volumes of

water were removed from the well casing. Samples were collect­

ed by Roux Associates personnel with a stainless steel bailer

that was thoroughly rinsed between wells with both tap water and

distilled water. Field blanks and bailer blanks were collected

and analyzed to provide quality assurance.

The results of analyses of the water samples are given in

Appendix E. A summary of the concentrations of EDC and VCM

for the OW-series wells is given in Table 3 and shown on

Plate 4. Based on these analytical results, it is apparent

that a plume of ground water containing EDC and VCM is emanat-

ing from the area of the waste water impoundments in the western ? • portion of the PVC plant property. Since large quantities of

waste water are stored and treated in these facilties, they

represent potential sources of EDC and VCM discharge to the

ground water.

The line of observation wells which were installed immediately

downgradient of the PVC plant to delineate probable source

areas, all contain EDC and VCM. Values of 17 ppm and 11 ppm

of EDC are recorded from OW-6 and OW-10. Greater than 0.7 ppm

EDC values were also recorded at the other wells in that line.

AR300054 The highest concentration of VCM was recorded at OW-10. A test

ROUX ASSOCIATES INC

Table 3

VCM and EDC Content of Ground-Water Samples from OW-Wells and On-site Domestic Wells

Stau_ffer Chemical Co. Delaware City, Delaware

Sample Designation Date Collected YQ! (ppm)

Alger Deep Well 4/27/82 l.Ll-Alger Shallow W9ll 4/27/82 tl:> Alger Shall~' nell 8/16/82 ND Tunison Ki t.:hen Tap 4/27/82 ND OW-l 5/6/82 0.51 CW-2 5/6/82 0. 20 OW-3 5/6/82 ND OW-3 8/16/82 * OW-4 5/7/82 0.20 Gray Well 5/6/82 ND ow-5 5/25/82 0.41 OW-lA 5/25/82 ND OW-6 5/25/82 0.33 OW-7 5/25/82 0.45 OW-8 5/25/82 0.33 OW-9 5/25/82 0.05 OW-10 5/25/82 1.3 OW-12 5/25/82 0.40 OW-11 8/17/82 0.014 OW-11 Dup. 8/17/82 0.007 OW-13 8/17/82 ND OW-14 8/17/82 ND OW-15 8/17/82 0.54 OW-16 8/17/82 ND OW-17 8/17/82 0.14 OW-17A 8/17/82 0.028 OW-18 8/17/82 ND OW-19 8/18/82 ND OW-20 8/18/82 ND OW-21 8/18/82 ND OW-22 ll/30/82 ND OW-23 11/30/82 ND OW-24 11/30/82 ND OW-25 11/30/82 ND OW-26 11/30/82 ND OW-27 11/30/82 ND OW-28 11/30/82 ND OW-29 11/30/82 ND

ND • Not Detected * o: Detected near the detection limit; not quantifiable

~(ppm)

W-ND ND ND 0. 76 1.8 0.006 0.004 1.2 ND 1.2 ND 17 7.8 1.1 0. 79 11 3.7 0.95 o.74 ND ND 7.9 0.009 2.1 0.4 * ND * ND ND ND ND ND ND ND ND ND

Dup = Duplicate AR300055

ROUX ASSOCUli1IS INC

- 26 -OP.IGI:lM

pit investigation upgradient of this well has been conduct~d)

in an attempt to locate a possible source. The locations of

the test pits are shown on Plate 1 and the geologic logs are

included in Appendix A. No waste materials were observed

and no VCM was detected in any of the soil samples collected

from the pits. EDC was found at the detection limit (1 ppm)

in one sample, but this does not represent a significant source.

Downgradient of the PVC plant to the northwest, concentrations

of EDC up to 3.7 ppm and VCM up to 0.4 ppm were recorded in

ground-water samples collected near the periphery of Stauffer's

property (OW-5 and OW-12). Values of 1.1 ppm VCM and 4.3 ppm EDC

are recorded at the Alger Well. These values are higher than

wells initially installed around it (OW-l, OW-2 and OW-3). This(

may indicate that there are discrete masses or slugs of ground

water in the plume that contain higher values of the two compounds,

or it may reflect the difference in screened intervals between

the Alger Well and the new observation wells.

Ground water from OW-3 contains only 6 ppb EDC and no VCM. This

was considered anomalous, since other wells in the vicinity

(Alger, OW-5) showed relatively higher levels of these compounds.

A second sampling indicated 4 ppb EDC and VCM just at the lower

limit of detection (0.002 ppm), and with OW-13, OW-14 and OW-22

showing no EDC or VCM, this well is now considered

northern edge of the plume (Plate 4) •

ROUX~INC

- 27 - O~,IC.IiiAl (kt;d)

West of the PVC plant, the VCM and EDC appears to be confined

the the deeper, more permeable horizons of the Columbia Forma­

tion. Ground-water samples from observation wells on Stauffer

property, screened in the deeper horizons (Unit D) of the

Columbia Formation, except OW-3, contain EDC and VCM at ppb and

low ppm concentrations. Ground water from the Gray and Tunison

wells and well OW-lA, screened in the upper, saturated portion

of the Columbia (Units Band C), indicated no EDC or VCM. The

screen zone of OW-17A is intermediate to the water table and

the bottom of the aquifer where OW-17 is screened and shows

less EDC and VCM than OW-17.

The vertical hydraulic gradient in the Columbia, as previously

discussed, is believed to cause the EDC and VCM to be found

only in the lower horizons of the aquifer, i.e. above the Mer-

chantville. Thus, ground-water flow, not the presence of the

EDC and VCM, controls the vertical distribution of these com-

' pounds within the aquifer. This is to be expected since the J

compounds are dissolved in the ground water in such low con-

centrations that they would not significantly alter its

density.

No EDC or VCM was detected in any OW-series wells west of

Stauffer's property. The plume of EDC and VCM has apparently

ROUX ASSOCI.....SINC

AR300057

- 28 -

not yet reached wells OW-22, OW-25 and OW-29, which are im­

mediately downgradient of Stauffer property (Plate 4). This

is consistent with the minimum projected ground-water flow

rate in the Columbia aquifer at 100 feet per year and the 15

year e1istence of the PVC plant.

Ori!GifiAL (Red)

In addition to the monitoring well program, 16 domestic supply

wells screened in the Columbia aquifer and south of Wrangle

Hill Road (Plate 4) were sampled on November 10, 1982. No VCM

or EDC was detected in any of these wells. Also, Getty wells

G-1, G-3, G-5 and several domestic wells screened in the Columbia

aquifer to the west and northwest (W-50, W-51, W-52) were

sampled and analyzed by EPA and showed no EDC or VCM. Getty

production well G-4 and adjacent observation well G-4A were

sampled on January 11, 1983 and no EDC or VCM was detected.

All of the available analytical results from off-site domestic

wells screened in the Columbia and industrial (Getty) wells

screened in the Potomac Formation are given in Appendix E.

In addition to the recently collected ground-water samples from

the above mentioned wells, samples have also been collected from

some of the MW-series observation wells, several off-site dom-

estic and Getty wells and several surface water bodies. The

analytical results from these samples collected on March 9 and

10, 1982, are given in Appendix E. The samples were collected by

Ecology and Environment, Inc. and split with Stauffer. Both

ROUXASSOCUn'UINC ,

AR300058

- 29 -

Ecology and Environment, Inc. and Stauffer analyzed the

samples. The analytical results from the MW-series wells

adjacent to the PVC plant impoundments (locations shown on

Figure c-1 in Appendix C), can be summarized as follows:

MW-1, no EDC or VCM detected; MW-3, MW-5, MW-12 and MW-13,

low ppb EDC and VCM; MW-8, MW-9, MW-10 and MW-11, low ppb

VCM and high ppb to low ppm EDC. Most of these wells also

contained low ppb concentrations of TCE (Trichloroethylene) •

These results, along with the analytical results from wells

OW-6 through OW-10 and the observed ground-water flow direc-

OriG!~:Al (R.:d;

tion (Plate 3) suggest that the source(s) of EDC and VCM found

in the wells are one or more of the waste-water impoundments.

The EDC and VCM concentrations in OW-6 through OW-10 are felt

to be more representative of downgradient conditions than the

concentrations in the MW-series wells. This is because the

MW-series wells are constructed with three to four-foot long

screens near the bottom of the aquifer, whereas OW-6 through

OW-10 are constructed with ten-foot long screens that span

the entire saturated thickness of the aquifer. Since the MW-

series wells are located very close to the potential source(s),

EDC and VCM are likely to be less concentrated at the bottom

of the aquifer than near the top. For this reason, the chemical

results from the two sets of wells cannot be directly compared.

ROUXASSOCUII'-INC AR300059

- 30 -

Wells W-5 and W-6 are shallow wells supplying a gas station

and auto dealership located near the intersection of Route 13

and Wrangle Hill Road (Plate 1) • The sample from W-6 contain­

ed 6.1 ppb of EDC and both well samples contained low ppb

concentrations of TCE.

The surface water sample locations are shown on Figure E-1 in

Appendix E. None of these samples contained detectable con­

centrations of EDC, VCM or TCE.

AR300060

ROUX~INC

- 31 -

SUMMARY OF FINDINGS AND CONCLUSIONS

ORIGINAL (R~d)

1. The shallow geology in the area of investigation, from

land surface downward, includes: layers of sand (Columbia

Formation): a clayey silt aquitard (Merchantville Forma-

tion) : a sand layer (Magothy Formation) ; and a thick

clay layer of the Potomac Formation.

2. The Merchantville Formation and upper clay layer of the

Potomac are apparently continuous beneath and hydraulically

separate the Columbia aquifer from deeper Potomac aquifers.

3. High ppb to low ppm concentrations of EDC and VCM are

present in ground water in the Columbia aquifer in an

area adjacent to, and west of, the PVC plant.

4. The extent of EDC and VCM in the Columbia aquifer has been

determined to be limited to an area of the Stauffer and

Formosa properties west of the PVC plant and possibly a

small portion of Getty property west of Route 13. Also,

EDC and VCM is limited to the lower portion of this aquifer.J

5. Ground-water flow in the Columbia aquifer from the western

portion of the PVC plant property is apparently in all

directions. Observation wells in the Columbia aquifer to

the north, south and east of the plant do not contain

AOUX ASSOCUn'BSINC AR300061

- 32 -

detectable concentrations of EDC or VCM. Observation

wells to the west of the plant do contain these compounds.

Therefore, based on the distribution of EDC and VCM in the

Columbia, the flow of ground water containing these com-

pounds is to the west.

6. Based on the observed ground-water flow directions and the

concentrations of EDC and VCM in ground-water samples from

observation wells, it appears that the source(s) of EDC and

VCM are the surface impoundments in the western portion of

the PVC plant property. Based on the construction of these

impoundments, it is logical to assume that the off-grade

batch pits, which are unlined, are the principal source.

7. Flow of ground water in the Columbia aquifer to the west

of the PVC plant is apparently controlled by the slope of

the upper surface of the Merchantville, the presence of

more permeable sediment in the deeper portion of the Col-

umbia, and a ground-water mound in the western portion of

the PVC plant property.

8. The rate of ground-water flow in the Columbia aquifer is

estimated to range between 0.3 and 1 foot per day (approx-

imately 100 to 300 feet per year).

AOUX ASSOCUitr1Es INC

l\R300062

9.

- 33 -

The total volume of ground water flowing past the

of Stauffer's property to the west (beneath Route 13) is

estimated to be 100,000 gallons per day (70 gallons per

minute) • Only the deeper portion of this flow contains

EDC and VCM.

10. The Columbia aquifer is used locally for individual

domestic supply. The deeper Potomac aquifers are used

locally by Getty for industrial water supply.

11. No water supply well within the area of investigation,

domestic or industrial, contains detectable concentra-

tions of EDC or VCM. The one exception is a single find-

ing of 6.1 ppb EDC in a supply well for an auto dealer on

Route 13, south of Wrangle Hill Road. However, this find-

is questionable since the concentration is near the

detection limit.

12. Discharge from the Columbia aquifer appears to be to local

streams, primarily Dragon Creek.

13. None of the stream samples collected in the study area

contained detectable concentrations of EDC or VCM.

ROUXASSOCL«<'BSINC AR3000G3

- 34 -

RECOMMENDATIONS

Appropriate action should be taken to eliminate the major

sources of EDC and VCM to the ground water.

ORIGINAl (Red)

With regard to the EDC and VCM already in the ground water,

the approximate extent of these compounds in the Columbia

aquifer has been determined. Steps should now be taken to

evaluate the feasibility, practicality and cost effectiveness

of two possible remedial approaches, plume management and

interception/treatment of contaminated ground water.

Plume management would require further plume definition, a

determination of the ultimate discharge area and a long term

monitoring program. An interception/treatment program would

require evaluation of aquifer parameters, water treatment

methods and discharge options.

February 4, 1983 A~300064

AOUX ASSOCIA'n!S INC

Respectfully Submitted,

ROUX ASSOCIATES INC

~a~::~ senior Hydrogeologist

#~-President

New England Pollution Control Co., Inc. ORI;I:Al MID-ATlANTIC DIVISION ( C )

Route 130 • Robbinsville, NJ • 609/259-3333

M•lllng Addreu: P.O. Box 8364 • Trenton, NJ 08650

February 1, 1983

Mr. Paul H. Roux P.H. Roux and Associates, Inc. 50 North New York Avenue Huntington, NY 11743

Re: Stauffer Chemical Co. Site Delaware City, Delaware

Dear Paul:

This letter is to confirm that I have had the opportunity to review a draft copy of your report entitled ''Hydrogeology and Ground-Water Conditions, Stauffer Chemical Company, Delaware City, Delaware'' dated January, 198 3.

This letter also confirms that we have discussed my comments relative to this report, and that I am in general agreement with the recommendations contained in the final copy of. the report.

WJB:dld

Very truly yours,

NEW ENGLAND POLLUTION CONTROL

J~ William J. Berk Chief Geologist Delaware Reg. No. 128

MAIN OFFICE: 7 Edgewater P18ce, Norwalk, CT 06855 • Tel. 203/853-1990

- 35 -

Pickett, Thomas E., Geology of the Chesapeake and Delaware

canal Area, Delaware, Geologic Map Series

No. 1, 19 70.

Spoljaric, Nenad, Pleistocene Channels of New Castle County,

Delaware, Delaware Geological Survey, Report

of Investigations, May 1967.

Spoljaric, Nenad, Quantitative Lithofacies Analysis of Potomac

Formation, Delaware, Delaware Geological

Survey, Report of Investigations, October 1967.

AR3000~5

ROUX~INC

P. H. ROUX.& ASSOCIATES, INC. Consulting Ground-Water Geologists 0:: , .. Hi.

tl PROJEC -~ ' ,. ( WELL LOG CLIENT C:,i"' .,-r7,-, dtn~. {'o

DATE ~REPAOED 6/~/;:02 ev..J: f), t~.ut •h IS

(k d) T

' OWHER

DEPTH, ft DESCRIPTION Wf:~L NO. ow-1 4 ~OCATION D

Brt,.vt'l ;.tHy cla!J w;1), J,s,-,-.1,~, qf1, . TOPO ltTTIHG . .Sa,.Y/11{ 9_'"1ft"'S rvnJ p<'/,6/e>; sccd/l'~cJ IROUHD El..EV. . 0 r ,9ti(.A'J I C f'l r..f P r i d

-,1ho /8.;J.. . --------·. . -·· -- ·- ··- - DRIU.INO ITAOTED

011<-llfjf:·brc-:V.,, {,,,<: t~o I I II' {)1 l( "'1 DRI~~IHO CONP~ETtD (J hu l><:l /0 • ~

DRI~~ER ::r. c . Frt I~ "'''' Assoc. . ~ o,nd · sl!-11 a:+ ep,..inti1 1of l?e~,s· TYPE 0' Rll M ~t/ ff t:d CJ" II -)

' . IN~/1-SCirieci. ~ '"&Ltctr1~ c-sr; . W~LL DATA -Ftflef_:; )amJ"!t.'ded ~ 10-15"~0 HO~E DIAN. '"(~ .. , h of!. a v )' tn i 1> t? r ~ / S 5 '-< r /, ,, ;; "NA~ DEPTH {,;. s- .fPet·

;o CASINO DIAM. L/ ,;.,-lht.S . lj(ll'tH"f' f'..A• J t'(IVI? ~ ,·() ,;:> /c:. (lf) CASINO LCNITH s·-,, • -/(> ~;. r '· s ~1.c r-up

. . M ,'ca C'f?Oli.:- Mmt•·afs ( 1.1 .1srrv•J<

ICRCEN DIAN, </ .~ ( ~ . , ' . ICR[EH SETTING 6 /, "!;"/( 1 ft +

v/;;i,'/c I(/, /v~ ik>). ~ .n':Jt> I)VC . ICitCE'H SLOT 4. T'rPC

-I- a..-n OC (CISICl!•~( It-~ if(/ I..( WE~~ STATUI 30

pebb( ~,,, ;;d &Vn & ..; . C c; C7 r ,:· ..__ ~ DEVELOPMENT

- ~ Ci-YJ J. ~.s o~r! - (l,.,. 2~> t:· t ~ - : '"L-fl,~~GI;e

1D

REMARKS . . -A ft-ertlc(f,~: lttJNi

,. ;;; ;; ;k "'~-. C" I a..;; J M f cf "1o c c;o ,:, r: .... '. ., .. ,.{

so -1- F>eb 6/e qr"' v.e.JI ·-- ·- ... .

Ora~t;c /ri<Jr..-loofo . ((ct,:( .: i

! e<-rtd 1·1 ;.;-~ sfrtql's cJ . nf'rov_y ,,,·,~~ ., ,-r/:;

?:,o ·1-. -r.. I.( "''~' ·( C' L <0:; ~ a:-;-.~ _ i:!f..LJJ.!,· 1__ . 6-rl.(..nisi.·_Jray .st'/f "-';;~ .

. /)ocl:eis o.f' f•r.e .S!ll,d · .. ,

. c /t::fye_;; ,:,., pl~as

.

. AR300066 . 1-

.

APPENDIX A

Geologic Logs

ORIGINP.\. (Red)

~R3000~7

P. H. ROUX.& ASSOCIATES, INC.

DATE ~~[~AREO ~ IY

Coneultlng Ground-Water Geologists De I Ci w "'f ~ (', ..; !( 0 R : S i i M I."ROJ E CT ..,S;;::t;.::•;...:..:" ;.{,;;;(:.;r ,.;;:.-:(;.,)),.;r;.;,...;.._,.,'c~:J-r, -::C"::-:o::-.-

WELL LO G I"~·') CL.I£NT 0 t \n~" r;; /~/- .J :J ~/ft., '" IJ

OWNCit sec DEPTH, fl DESCRIPTION WELL NO. a w- ;;~ -

I..OCATIOH 0 ~row, S a•dy cf«J v.uU, r> r 'I i"itoJC . Mc.ot/f!r v

TO~O IETTINO ___ , ·-·-·- ----------. 0 r 4->1 ~\? ·I:JI·c w r/

1 {'1 riC U• IROUNO £1.£V .

I

'S/J/8:l .

YVi e cJ. iu M s cvnd · I~ e red · ORl~i.lHO STUT£0 . , ) DR .. I.I.I NG COII.I.ETED S"' lt..' IE .:;} - well·s:;dcd. DRli.I.E~ . :r; E • F, o_t s 1).,.. (,( A ~ '()' . 10 ·t-TYI'E 0' Jtll M LA a Ri.L/_p r y

··-- .•. ------- -------

Ora.-1'/Dt:- bro~AFn !' uo Y' !.J WEL.L. DATA . HOI.£ OIAII. 9 I"CJ.t'>. .

Soried 9rr~.vel{_j .::.ct..-t-rd ~ "NAL. DEI'TH {,7. S" "f~f!i. ;Jo • t" irt"tc>r/;,{' cf d I'J. w 1 H., t--Jc.U- .JMieJ CASINO DIAN. 'I L"<~~'_i

. CUINO I.ENOTN ~fi' 5' ·feU { l. ~ St·t_I·~-< IJ .{,11·~ to m~d. u.,, !: U·•l cl S

IC~HN OIAII. 'f I~ dt$ . . 6.:. "56 'j u+

rehi:Jies tlh.J )

of ICREEN IETTINO .

5 rCLr ~I lc > SCR t( H SI.OT l TYO[ o~o J. Vf". . ~ t..<a..d '- WEI.I. ITATUI

3c • t" . DEVELOPMENT . _;). IJo .. tc - t"ll.-~---------- 7o ""1, t.d .. ~ - ~(..I b """''S I~ 1,;:: . Alierno.i~'n3 ta.y ft' ~ of

-(I 1'1 e. "to /)'\ <c' d I IA.~jA Sand> ((J(lf$~ 4o · I" !:'ayocJ. Cl-}ld c la..:Y grl(_y . P.E MARKS .

-- .. ---·- -··--·-. Ora~<::;e- 6rcw11 1Yl ~ cltt<tl' 7 0 .

!)o . t- COt< I'~(' s' ' 4!,J·~.J j -S C Cl fl,'rt cf . tf (A (1f it- fd;61~s ; poor~ .

Sort~~ '" fl 0.. C(> ,._ ¥J I H 0 '....J <>.• .. :+ /111 ·~ C.C IH'I'J.~

bo · Ou(lrff. fPU~s tc.ncl cc/.,J,/("~ . 1" ~ .. y r..,~lr•X ----· ... ___ . ~r4' -e--n ,5 J..-!) r&- 'J cl C<!:J ')1 s/11-.

. w1k le..,s .. 5 o-{' b !a v<c.o.;i·c ··

. sa-..J· cl~ ,,;,(',11!':..5 b,.,,~'<IJ )

AR300068 . - --· -.

.

.

'--·

P. H. ROUX.& ASSOCIATES, INC. Consulting Ground-Water Geologists

WELL LOG

DEPTH, It DESCRIPTION

0 ....... - ...

.

.

. :L 0 ·I-

..

. ~0 .

.

---

1o --. . .

sf) . . . !--+---------=-· -------- -··--··-· .. .

60 + . . . -

7o + . 1--. .

• I.

OrfVL[je/rned,uirl 'lO cot:use sand Will, ,/,"sseo•tti<YI<:d ~c66k.s o-f ~ u(.J)h; .jrtvn/k w.J c he,f

ow • E" --~-:--.,.,-_.n,~.~l 11U.J 111 r.w: l.u. Nlc;, A !l~-----i Ow --~ 1n .• .l\ WE~~ NO. -...1.:~'-""---+1~~---~

~OCATION -------'------l TO,O lETTING-'-------------!

QROUNO E~EV. -----------l

w;_L.L DAJA_, HO~E OIAII. K 1n ~ I'~ roNA~ OE,TH "7 "7 ~I' I+ ' CAIINOOIAII. L/ I'IC~f! CUING L£N8TH ': '/.li' ..(,,+ SCREEN 01.011. -~4/~t~o~C~ ht...lf'------­ICRUN SETT INO -='~fr"---,· ~~'..11,-li-.,..,.,...,::--------i SCRtEN SLOT I. TT,£ .0:::t0 /) Vr WELL STATUS

DEVEI..OP!'IENT ;;:\.5" kc<.<r-'- i'<i,-

P.E MARKS

• "'·----

P. H. ROUX& ASSOCIATES, INC. Consulting Ground-Water Geologists

PROJECT (!, .. -((,., (~,,...·~./ ?'o. WELL LOG CLIENT

1,. ,.. Dt.N\,.,.f,~·~ ~ATE PREPARED I, li: Is 2 ,

OWNEIIt -DEPTH, tl DESCRIPTION WE~~ NO. OVJ 5 ~

L.OCATION A .. II'INM 0

.Yei/Qw-bro~<N/ 1 -(,~,- -rdi:J -.;cu,tl, v

"' TOPO ICTTINO \n'-'w/ tm rrJ ed we.. IYI!n era fs s u c h Ct ::

UOUN~ E~EV • . {tfdspars, r>JJC"'S a.n d ...L "'ph/ 6cJ~ .

DRI~~INO STARTED ~ lr:~. I (r J.. ----- -. -· --· ···--- -OR;~~ING COOIP~ETEO C: 11 ~ If': ::l H ·J..ighf-brown, -l'tn~ -to ,.,.,tJJU'JV.

to ·'" DRI~~ER J. £_ , F r, 'fj 5 i. ,_ d S Soc . . S t:Vvrd ; $ ,· 11-:J 4 f cwl. 'c. L<irt. L TYPE Of Rll M ~ rJ (J ~-{,, r'y

. ~tJr•l-tl¥1.5; sce.fl~r-eJ ·'f>~u·rl~ W~L DATA . p t k b I e s "'-'VI tP roc t .f'r"" (;"'1 e rd.5

HO~E DIAM. ~~ c~.,.;; --- --------- 6 ;~ -Fe.,. I-

GrAy C/7 ~ 1-e.LA !>es o.f f,;,j ,.NAL DEI'T" 2o f-

C~SIMG o-.w. 'f r>.c~r~

s C1/Y1 J. «--•· 5: /II- CASINO ~ENITH 'I 9, 5 -1 .-~+ SC:ftE EN OIA M. 1./ r'n d '<;

5'11--1./f' -l<!~f --~-- -~

ICREEN SETTING A It p,.., a.-f,nt la..::;ert o .( coc-rse IC'R EE H SLOT 4 TY!t£ .non {) VC. . s ()a! d a-.. d f"<' I. le' S' 1 "fn,~' .SU4 rd Wt~~ sTATUS

3() t~LMd. wJ, ,-;..( { 1"- ., . ·- ~-----··-·---B J"' , DEVELOPME:NT . r()w, me 'u.'"' gr<J;ncct

-:(,5 hot-' I'$ A 1 r . ~a-v,J; w<./l·tarl<'d • i/,;;, 20 "" 'CI r t..,. i .5~ b l"r• f'/', 'j,/, • -. 1<>--!:IN s- o .f' ~ bh le j

40. Ye//oc.~. brown, -·····- ---- ----·--

c ()C(j' -:<~ ~

:.~{,.. nJ

0/nd p~ b 61( 'i. v/1-h -j-1-,,'r, b .. ds P.EMARKS . C'.(' c I J; peb 6/,; ,, ci:.J' . ·l'rl,fnx '" plact>s

s-o • f-. J.., ji,+- 6ro cun 1 -fu,e Z:0 "''cdnt,.1 .

s, C{/Yid i JV-( ll-.5 or fed

r .. r"'v~T------ -~~~- :-~ U/. utrr12!. 6o • 1-

C'ra..:J .a/f w;J.I.. /~.u.s o/' . . -f,,e .s ~d · ch .. ,:;e,Y I"! .) . fJ Ia c.~ .1 . .. . . . AR3000{0 . .... - . -

. • L.

~-

\

DEPTH, It

0 -.--,....

/0

~0

-.

+

.

.

. -

. . . .

30+

.

.

~ o ·r

so

.

-

--. .

.

.

.

.

-. ....

P. H. ROUX & ASSOCIATES, INC. Consulting Ground-Water Geologists

WELL LOG

DESCRIPTION

Ora.,~.<: -b .. o c.v,.,, cl«ye y ~ et-11 d) ,fr,m,Aiura. ~e.;f.e of yJ1,r>-er<>.l.s; .5 c <t if € r e J p e b bl t ~ an J f.-Ohi:J,.s. tJf' ·~ 1..(.-ufa

-~ ucu_j <:. Gr~ ve..t __ .

~arK g_ r.·e..-y, 1s.J1- 9 rt> .J cIa:; J !,1/f w,f~ 1-e-hs"<':> offrliCMccl(_

!Ct-nd ( gloucC/nihc) · 1n?ie.rd S !Af;;A ~de forr.~t(f,?y, /

•

OWNER----~~~<J~~~~~---1 wE~~ No. ____ ...D...CL.IINc.::..::-:....:Y~n~ o H:~:.l'-.lJ'IN~IA~l----l

~~ L.OCATION ---------------<1:*',~------l

TO~O lrTTINO ~-------------------; IROUND EL.EV.

HO~E DIAII.

WELL DATA "ii "' (' j., I' f

riNAL. DEPTH ..... S~:J~,:-=S'!..,__z.!-f_t';LJ~' "f.L...;.,.· ---------j CASINO OIAII. Jl /1'1 C I.~ <

CASINO L ENITH -.:t.;, f,l "f.,_~.f''£.~l~ ~d.~-:---------"1 SCREEN OIAII. Jl ,;, I' J, t'S,

ICREEN "TTINO _5'/- 'I{ ;:,~-SCREEN SLOT I. TY~E -I.' (i~.;J.:Ji"W;P:....~:.V.l..... '--------j WEL~ STATUI

DEVELOPMENT ~ J.o ... u -_8_,;.

REMARKS

AR300071

P. H. ROUX.& ASSOCIATES, INC. Consulting Ground-Water Geologists

WELL LOG < -1 '"' -r ./' ~- ("~ > •• , CL.IENT "~,.,I('~( (I.

o.uE ••t•••ro "I~ I •~ .. .:1" fJt•Jr;'-'r1 ,,,__;;

PROJECT '

C. I 'f

' OWNEIIt

DEPTH, fl DESCRIPTION W[~~ NO. 6 It<)-/, ~·

0 I.OCATION

::.),,,,,{)' c/a'); di:,.~, IJ.'/11:?' 1c•({ C\!"i\G\\\1-\L . ID~rl\ or ~CJ-·Hc f>lq1eriJ TD•o lETTING

IJNI''"n a1(1;3 ---- ------------ IROUNO ELEV. . /<t:Jf'r ~- ~r qr,;,,Y · . r /oh.:-. clay.~ qruy,i:;~ · [Y"'7 -r'" <" .: :r.t cl

DRI~LINO ITARTED

Dlltl LL.I NG cowr~tTto !i' I I' 7 f.:! /0 - 1- (t/h J C 0 ar,;e f" <hi~ ct.-nJ pi'L·b It? ORI~LER :r. I:. •, ,·fj, ..-,~ -A~.s" ( . . '3 r"' vef TYPE 0~ ••• /111 ,_,to( ~0+1', ... . Ye I/o v 1 111 ~ /,.;..., %

-- --------·--. Ct:- ~Rrrc.

WEL.L. DfTA . 6a-·' d ; w~ /1-So rfpd · 1.:( )"'' cr:f HOLE DIAW • <; ,. ' " 3;l -r.,~+ . ---------- . rl NAL. DE,TH

.l.O 0 r a"'9"' > cv .. j 7 :.iti~ 6 /, lch"; ~ASING DIAN. 4 ,;..,.. ~-~.!. . 0 f ~/fly CASINO Lf:NCITH 1'1.> +n-1 .. T ------------- SCREEN DIAM. /J,;.,J.,, . Gvezy c/"Y"'Y ~,If ~.vd/, SCREEN SETTING 1/ , - ;:1/. s- {.-.c.1

·0;:1<> f)vr - /ensq of 3 J~vc n.,.;,c .-_: ,1"1' ./. ICRUH S~OT I. TYOE

3o . J WE~~ STATUI f. -tl.,;, 6fd,- of 7 a,, ("/,_..(II

0 ,_,;-//,,' ~ _j DEVELOP ME NT . /. 5 A o I-f,..:. A,·~

. 2:12 "''~'~v·lP.:: ~ "' l. C::: 0 t" ~· I;,~~.,

.

. P.E MARKS .

-... . . . . ·I-. . . . ..

+ AR300072 .

- - -

. f. .

• L..

P. H. ROUX.& ASSOCIATES, INC. Co II G d W tar Geologists

I nsu t ng roun - a

.De (6_ ... PROJECT ~ Uo'-. r-<

WELL LOG CLIENT c i ... vffer C.he,,<,•-t_ C.ro DATE ~Al"ARED {. /.• /r ::1 IT .:f 0 r..J'1. d_,~' J .

OWNER

I WE~~ NO. ow--, or\,tJn.ht DEPTH, ft DESCRIPTION

~CATION 0 lK.e.J:IJ Br" w~ san~'j c/a'j·. Fe0bi,..s

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P. H. ROUX.& ASSOCIATES, INC. Consulting Ground-Water Geologists

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P. H. ROUX.& ASSOCIATES, INC. Consulting Ground-Water Geologists

WELL LOG

DEPTH, fl DESCRIPTION

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WELL STATUI

DEVELOPMENT '1 .. \,r '""'

P.EMARKS

AR3000~5 -

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WELL LOG

OEPTH, fl DESCRIPTION

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P. H. ROUX.& ASSOCIATES, INC. Consulting Ground·Water Geologists

WELL LOG

DESCRIPTION

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P.E MARKS

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P. H. ROUX.& ASSOCIATES, INC. Consulting Ground-Water Geologists

WELL LOG

DEPTH, II DESCRIPTION

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WELL LOG

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DEVELOPMENT I '-'o , .. • p,_ -...--

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REMARKS

AR3000?9 -

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P. H. ROUX& ASSOCIATES, INC. Consulting Ground-Water Geologists

WELL LOG

DESCRIPTION

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P.EMARKS

AR300080

DEPTH, fl

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P. H. ROUX.& ASSOCIATES, INC. Consulting Ground-Water Geologists

WELL LOG

DESCRIPTION

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AR300081

P. H. ROUX.& ASSOCIATES, INC. Consulting Ground-Water Geologists

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P. H. ROUX.& ASSOCIATES, INC. Consulting Ground-Water Geologists

WELL LOG

DESCRIPTION

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DEVELOPMENT \ \'c , .. - _:. :,-

P.E MARKS

I

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'

~R3000~4

-

P. H. ROUX.& ASSOCIATES, INC. Consulting Ground·Water Geologists

WELL LOG

DESCRIPTION · DEPTH, fl

0 ·---------

·, 0 ·I-. .

. 15 .. 1---+A--,-~--"-.... -.,.-,_-:-,-. ~-,,--e--.-,-o-,..--,.,-.-.... -~ !J o \ o """~~ <- ro. ·"Dt

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·PROJECT Sti'\ 0'.\&t·t C :t'/ CLIENT l'd~'w"-.._ ',. < \·,( '"·,,... l r DATE PREPARED U-·;q .. y-, lYe ·' ·,, •

owNER"'~, !,.>.-u: '"'~·;_·;'. t;:~ I WELL NO.4,:,- ~~ ._. ~ -LOCATIOH. ________________ ~~~~~~~~N~A~~------1 ,, !\

WEL.L. DATA Q."

HOLE DIAM. ""'-L D[~TN __ _:r:"'-.:.r":-.' ____ ;__ _____ _,

L.i ,, CAIINO DIAM, _...;;.L....,. __________ -j

CAIIHO LENOTM _.:;>....,.1''1..'-----------l ..... SCREEN PIAM. -.....:::1..~~-,~~...,..-----1 SCREEN SETTING &.4(J.I,<;' • 5C.t.<:,' ICRUN SLOT&. TT~E · fi"/ n 1'" <

WELL IUTUI

DEVEL.OPMENT \hr--;>,·,r

I '

REMARKS

AR3000~5

.

r. li. KUUX & }GSUUAIJ::S, lNC. Conaultlng GroundWater Geologists

WELL LOG DATE I'REPARtD

. I .. . .. ,.. ' ' t 'I \' ·I • \ r l r r \

OWNER S~~~~:s:•: c.~~· ~"' ~~ ( ~,. \ Cr ·~ DEPTH, It DESCRIPTION WELL NO. - t ~k

~OCATION 0 ----- ·------. 0 <'_O.""'J ~ c-... d. "':) ....... .., """' ' c.c- ( CP L j l' f\' "" ··,l,l

TDPO lETTING . ';;.\ \ ~ 0.~ c \v..'l ONOUHD E~EV. '. ; ' l

. DRILI..INO STARTED r• . -~- . .:.:-"' 2_

' DRILLING COWP~ETED .- .. , ... ' s . 'T. F \~r ~ '\'1: r • ' DNI~~U r• . • .• ~- (_ . TYPE Of RIO , .. , ,,!, .,-, .. .1,-r, '·I

.

. WELL DATA

. MO\..! DU• ... ..-;__'.

fiNA~ DE,.TH \ .... \

IO ------- --- .... <v 1c..o'-11.5' · b t-o "" '' h\,\(l\~((o(.::-;

C'-IIHO DIAM. . := CAIIN4 LENGTH

.,. S; I+ ""c. cle..y. "REEN 01.11.

..... .I "REEN SETTING -<,n'- iS .o

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15-WELL STATUS

. \ OEV~LOPMENT . IJ?. n•·'<" - ·, c-

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. AR300086 - - --

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r. !"1. KUUX. Ol f\;:,;:,uclf\1 1:.;:,, INL.

Consulting Ground-Water Geologists ·PROJECT D-t \o," ~r,, .,_ C : 'T,,

WELL LOG CLIENT :br>r.C:..s-· t • C \-..s ·~,.: ( ... \ ( ,

'l - 4 ?.7.. 0 ' • DATE PltEPAREO .. · ( . . ,. .:-, -~\-•_,, ....

OWN [A "*"-"+£, (' r'- . ,\ c., . DEPTH, fl DESCRIPTION wELL NO. "' ) -'"'

0 ···---L.OCATION - ---

1\ '· ,., I r · I. I l~<""'"j ~"'""" l c..\...., \,.oV i-t~ oc.c.~-:. :c- ,.-.,\

l'~bblt. to'"Do."''' cJ :sse.yw\l V\c;-hcJ 4-l"~r" \1 ~~ \_,o LJt TOPO lETTING "' "\ . GROUND ELEV. \"~UJ

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,, \ .. \ ... -*'~. ,, -. ~.~LL DATA . HOLE DIAN,

f'l HAL. DEPTH -..,~,

IO - ·-·-- .. - ·--CAIIHO DIAN.

...... Qf""C'o"""J~ ~+o.~Y'\~c\. ~\v-.i:-, ,.,.,~c\~v"'•• 1"\'<'~

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-. AR300087 - .. . --·

P. H. ROUX& ASSOCIATES, tNC. Consulting Ground-Water Geologists

WELL LOG ·PROJECT Dr \c"r-'.. c "r'l CLIENT ,- +c , ~L.- • c- C \··

(:~4.r~ DATt PREPARED ~.- J

~ ~.:. IY . ,. ·-,, . \ ... ,.

OWNER r .-\-i ,, '~ ....... f c- c: \... •'• . • Cc ~i DEPTH, ft DESCRIPTION WELL NO. , .. s.' . lC:·

0 LOCATION fll">l"''"' ------O<"o.~<- "j "'\"-a-..-, ,, tc\. . ~·'I"'\~ 'So.,,c\ o,.-..c\

,. -' . "' . 'S ;* c..c..oor~c.. ..... ;...,.~ '-'f ~o..·~ ~ ...;.0 Cc-~\'"'~(.. TDPO UTTINO

I '. '.1'

. $.,....-..c\ ... ~.,. \l'c. "v\J\(. ..., ...,., " <·l ORO liND £LEV.

- DRILLING nARTED 9. -"2 - <:".·?

' COWPLETED '~ • ·t.- ~; ·1.. DRILLING IO -- . ------ -r r·. \""' ,. <\\' .... ,, .. ' '

f'uc-~ c:.~\c;t'·c.<A !;!:"~ ~r-~in41J. ';. "-"'C~ "-•'-J DRILLER

s i \'t ~i1"h +\-:" he. r ; 'Z,C n :,; 0"· CoC,\'';.C:. TTPE 0, RIO \\"\ J. \2-. ~-,. ·•/

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~ II.S', WEL.L. DATA . ' '' ~ ts.o'- Z. 3-S'

HOLE DIAM.

"' . 0 f'O. ""':~<- <"_.+Q;IHJ ,I HAL DEPTH "1':.'

'ZO ~~ "'" O)<'CA~~•c\ (" .. o.n~ ...... t,:,.. u·• '" " ~-. \-f CASING DIAM,

2?>.~. .. "'c ...... ," ( • .,....,-...,. CASINO LENITH ·-s -c --- -- .:I·•

.C>J~ Q>-... \:. \ t - SCUEN DIAM.

2.~ ------ -.;[~ . .::.' • l.j ., •

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ICitE!N IL..OT &. T'fpo[ ... c.,-1..~(.)

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$ p., ...... ~ Qo. ... ,(,_ op_;, \" • > f .

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_D~~;LOPMENT

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---. . .. ·I-

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- AR3000~~ ~ -

--

P. H. ROUX & ASSOCIATES, INC. Consulting Ground-Water Geologists

WELL LOG

DEPTH, ft DESCRIPTION

0 ··-

. e-ro u..> Y\ c.. I""'/ ""~ -:.; \ t- Lo.J ~ -i-h

. r ~'Qbl<- ('~'C"'"""" c \ 1"1'• oo;.,._a '"' "'"' "' ~-~· •

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·PROJECT D-r\ c'' I 0' L

CL.IENT .-,.,_,., 'l..-1.: '" DATE PREP.t.ft£D ,-. • ) 1.-/ .-·· ~, • ., I

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OWNER <"~l14".S: r~-s; ·~·•,' ( ,. \ WELL NO. ("\ '•~ -, 1

LOCATION l.ii<''•I;IAI.

T0'0 lETTING rrN!)

aROUND ELEV .

ORILLING STARTED 'Z· ~ ·'f;'L

DRILLING COM•LETED "2, . -~ ·"i\'2.

DRILLER

T.,E Of RIG

WEL.L. DATA

HOLE Dl.lll. .-.11

fiNAL. DE•TH '-1 s I CASING DIAM. 4"

CUIHI LEHITH -:.,. CJ

SCREEN DIAW. '-1"

ICREEN SETTING '/'l./n' ··;·,·1.1~

IC'ftt!N ILOT l TY,E .n'll"l I-'Ve

WELL lrATUI

D EVE L.OP ME NT I h~ ,,- - ~:.. · .. ~ '3 .,_ '>10 ''" '.

. '""\)"'"";\ \•

P.E MARKS

AR300089 -

(" 0

I

P. H. ROUX.& ASSOCIATES, INC. Consulting Ground-Water Geologists

WELL LOG DATE ~RE~AR£0 - .. - .,

'· BY . • t ••

I OWNER

DEPTH, fl DESCRIPTION WELL NO. {") LU - ./ ' nr."'· •" Ki ·._/

VI·, ~ ,., •.

0 LOCATION (.)(...c -t- \..r. ·o~• ~ ~-·~ -:., ......... ~ "'o- ~ .... ' \ .,.. \"~"I

1- -- -- - - - -- -·- TO~O ICTTINO . Qf'o.v,p..)c:... - 1;-c ""'--cl """s: 1-\ \_::{c: ....... _\:. --\·u IROUNO ELEV.

J;.-- ~o.......J.-~ ,\-\- """~~ Jer.t.,.t-\.,- • ~·<.:.I ·: •• :•., ._ rt . r;' 8;0' -~~·c.\ """c. \o.-..t DRILLING ITARTrD \\-\"/_-'{ .. '£..

ORIL.L.ING COII,LETtO \\•''• .c_.·(_

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...,_..,... "'....c~ ·, ,,.). ....... .. '-<~( TYPE D, RIO

~

" 10"/".,-, c.~~--., ~- .... ~_:.,~. - ~.J·· .... -.,_ , ..... ' < \ . I WELL DATA

~ _ _..... .s A-1\A ..... ~ .,~ ,, . - HOLE DIAM •

'U>" - ~~c. ":,A,..J.."'" "':,, '"' ""AL. DEPTH

\-'~\.,\ •• \c.-:. a:.~ .:.('V'<'. o'c-.-tJ.. ..:t\... f'o •.J·: \ •C '~~ h' ( \--:- CASING DIAW, ... , - CUI NO L.ENOTH ., . c_.' ~

,,,c'<>'{ SCREEN DIAN. !_{

C::_~ :2.;...) I ~I-(;• 1., _,<:.. • i .. il: u o\.l ~-c. ·; .... ··- J. ·~ -i . ' . / - ~~ J. . SCREEN StTTJNO

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WELL. STATUI ~0 .. : ..:.··· ~ '~~""' (~''-~t·.l ,.'"l;J. '"-

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-.

I ..

P. H. ROUX.& ASSOCIATES, INC. Consulting Ground-Water Geologists

WELL LOG OAT£ ~RE'A~£D ~~-~.,-ZI., IY c-_.-,H\~~--·•'

OWNER ,., """ " . '""' ,, - ·c_•, v·. "o'\L

DEPTH, fl DESCRIPTION WELL. NO.

LOCATION \ ~ t. u j

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WELL LOG

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AR300092

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P. H. ROUX.& ASSOCIATES, INC. Consulting Ground-Water Geologists

WELL LOG DATE p~[PARED - ' -~· '

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P. H. ROUX.& ASSOCIATES, INC. Consulting Ground-Water Geologists

WELL LOG

DESCRIPTION I

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P. H. KUUX & ASSUC!Al t::S, INC. Consulting Ground-Water Geologists

WELL LOG

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A-R300095 -

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P. H. ROUX.& ASSOCIATES, INC. Consulting Ground·Water Geologists

WELL LOG

DEPTH, ft DESCRIPTION

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REMARKS

A~300096 - --

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!-'. H. KUUX Cl A~~UC1Al c~, INC.

Consulting Ground-Waler Geologlsls

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WELL LOG

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WELL LOG t'"'<>·O. 7,ol;;, 'L

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P. H. ROUX.& ASSOCIATES, INC. Consulting Ground·Water Geologists

WELL LOG

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P. H. ROUX.& ASSOCIATES, INC. Consulting Ground·Water Geologists

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TEST PIT LOG

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TEST PIT LOG

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TEST PIT LOG

DESCRIPTION

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P. H. ROUX& ASSOCIATES, INC. Consulting Ground-Water Geologists

TEST PIT LOG

DESCRIPTION

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P. H. ROUX & ASSOCIATES, INC. Consulting Ground-Water Geologists

TEST PIT LOG

DEPTH, 11 DESCRIPTION

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TEST PIT LOG

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_____ .. __ ··--"------~-c •.· •. 1-.•.·.v~,<f .. b);l<~ ··r- :e.

\ 1'·- v -·1.. · lc o' '" 1 •~ "I"cl<:.... t:f r. r-';.,"- ~ .. • ~·~ "' . ....-~-...-:. ·. \-t -, (,r'''! r·'·"':.

1.;_4----+-.,.~-.,...-. ,-, -<_,-•. -. ~-~. ----------- --·- ...... ·-.

.

.

.

.

.

PROJECT Ds \n>H 0 f$ Ct~ s::>s4lunriz. CLIENT r·iZNdt.asr k'wl'f'f\'. ~ Co I

DATE ""E.'AftED Q •"tP ·JJ. IY 5. ~,\J,~\.p.tf'->1-

OWNEO ---------------[ T •~' .HO.-.l.Ell.nc._ __________ l

LOCATION ---------------1

(kcuJ

AR300107

'· ..

DEPTH, II

0

.

P. H. ROUX & ASSOCIATES, INC. Consulting Ground-Water Geologists

TEST PIT LOG

DESCRIPTION

1~-+---------------------Oro.'"':!>"- ~oor-\'1 ~ oM-<J ~-C. ~"J. 1

f'"-'u"b\e~ • c...l.>vl~-., ... ~:\-\- . .

.

·PROJECT })s\g,q£.\f c~~. Os\-··v·' t, CliENT r-rtr I~ .... - c.~ ... ,,< 1' •• \ c.-. DATE ~ .. ~,Aft ED !J,· 't.". :C'L • .,. S· •· 5 'l·"' 'I I

OWHE• --------------------------T. I' ,HO. _·_..t,__ _________________ --1

LOCATION .-,----------------------1

-,

OEF'TH, It

0 .

.

.

+

-

.

.

.

.

1'. H. ROUX & ASSOCIATES, INC. Consulting Ground-Water Geologists

TEST PIT LOG

DESCRIPTION

3> +--+-------------·-·· ·- ----f:,.,~·. ~J·~-- :,..;;.. .... '{_{·, !)!\-\'1 c:...\c;..'/ ~ ......... ~ .......

. -

'-1 • . -

4.1.. +-+--------------~-------. e,ro~" ~: \~ c \c,'f

5 .

. I,~-

.

.

.

. 7 +--+-::----;-:-;-::-.-----:------- ·--- -.. -

c,~ s:'"'1 c;~,;... ... t O'lt...T-\'1,....._~ C<"""'"."':.c.. C-c. . -

7.(&1

..

So..-..t\ ~~4.))•\c. '·.:..co~ ~tc-\;o~\t,..S

TP/·1.. -,').y' o .. 14 ...... ~.J"-d"' -t:Jr-&;o.-, os:'+l ''"-'1..,. QN-."'~4,. ""'c.. ~""'""'~I t:.!'IJ'U\.c.• .. i (...;!_X.~:!_ _______ _

"ePr- - '. iP

L_ ___________ _

OWNU -----------------l T .t- .NO • ......j~-----------i LOCATION ..,.._--------------1

Oc, ~ .• ,,,. l',l~.' i,1Ji.l

APPENDIX B

INTERPRE.TATION OF PART 1 RESISTIVITY

DATA

(Rtu)

AR300110

ORIGINAl An interpretation of the Part 1 resistivity data done by John(Red)

Kick follows. This interpretation fit well with the geologic

boring logs on the Stauffer property but failed to detect the

Merchantville in the portion of the study area west of Route 13.

This problem was detected by new borings west of Route 13 and

corrected by reinterpretation of the Part 1 resistivity data,

with the addition of Part 2 of the survey.

The final interpretation of the resistivity data is presented

within the body of this report. This Part 1 data interpretation

is given in this appendix to illustrate what changes resulted

from the Part 2 interpretation.

The resistivity sounding curves from the project area exhibit

considerable variety, but almost all show at least three layers

including a relatively low resistivity surface layer, a high

intermediate layer and a very low resistivity layer (LRL) at

depth. Some soundings have been interpreted to reveal the

presence of as many as six layers. The table below gives typical

ranges of resistivities that can be associated with six possible

layers. Any given sounding result could be considered as a

special case of this table.

AR 30 0 I II

ROUX ASSOCUa'IESINC

Resistivity Range (ohm-ft)

250-600

600-1000

1200-5000

500-1600

60-300

300-600

Interpretation

ORIGINAl (F..: d)

Thin surficial laver - s~diment affected by surface conditions

Silty, clayey sand

Unsaturated, relatively coarse and well-sorted sand iiw.'./or gravel

Saturated sands or clayey, silty sands

LRL - clayey, silty, fine-grained and/ or compact sediment~

Coarse material below the LRL

The above table is meant to convey a general impression. A large

variety of sediment types and structures is possible.

The LRL is interpreted to correlate with the Merchantvill~ Formation.

Many of the soundings show a higher resistivity layer below the LRL that

is interpreted to be a more permeable, coarser sediment. Many soundings

not showing this lower unit would

sufficiently.

probably do so if extended

Cross Sections - cross sections A-A' through D-D' were constructed

by correlating layer.s derived from model analysis from sounding center

to sounding center along traverses. The locations of the cross

sections are shown on Figure B-2.

~~~~00112

ROUX ASSOCIATES INC

,, ' ' '•t '. ' . V1.1J ,,J-.i

( ''·- r.i I

Cross Section A-A' -.The undulating LRL surface shown on cross section

A-A' varies from 30 to -35 feet elevation with a tendency to error.

Layers above the LRL show wedging and grading properties typical

of outwash deposits.

Cross Section B-B' - The LRL surface varies from 30 feet on the east

to -so feet on the west. Relatively high values of resistivity in

the LRL may indicate a lower, higher resistivity layer at the threshold

of detection.

Cross Section c-c• - The LRL surface varies from 37 feet at sounding

13 to 5 feet on the east end and -85 feet on the west. The higher

resistivity material below the LRL was detected on much of this

cross section and a thickness for the LRL calculated.

Cross Section D-D' The LRL. layer is relatively thick here and dips

eastward. The layer below the LRL is visible over a portion of the cross

section.

Contour Map of the LRL Surface T.he contour map of Figure ~-l allows one t•

visualize the areal variations of the LRL surface. Values for contouring

were arrived at by subtracting depths to the LRL (from models) from

surface elevations obtained from the site topographic maps. The values

AR3001 13

ROUX ASSOCIIICIWS INC

A

50

0

-50r-

1001 B

100~

50~

s:E ~ c

:t ~ or, ' 50-

ocr-

0 ~o.--

1-~a i-

t­a[-

:t

~ _!Q_ ~ _!§_ 2L _£_ _M) __ ~ __g_ JL ..§L _..J.l 100

1

$ a21 0.:2•~00 - - 1 ;=00 1~ !0::;:: :o- . 2500 1800 -- IGoo~~==--·--~~·=~"'

... ~ 8 (-- _ zsoo ~ - ---- zsoo ·-==----"":' HC'--'

800 .,.. 00..... 800 1000 - - -- ---1200 _ _. 1"1'0...... ..... ~900~_.,.... __ _,,....;.800;~-----;:;:;;..-----;---- 100 ......._ 900 900 90 100 --:';':::------

' -- 60 ~ I~ 150 I

:00 330

PROFILE A-A'

(ELEYI

130 2so

l-50

-100

B' 132 ~ _..!!_ .!L_ 83 23 • ~ OW-SA

••• lr: ... I-=: •oo ~c uo lc J'H> I r:; '~:-

I - ,., ::u·- •.. ... n•• ,,. .. .,..0 2000 :::: z a >:>""" 3500 2200 3500 2800 24~

~ 280

400 1000 900 1000 I /

1000 ,/~ 180 .. 1000---220

260

PROFILE B-B'

]

100

50

O IELEYI

+50 '

W E

c· ...!QL_ .JQi_ M- _ll_ ...!.!- _R__ .JL. .JL_ ~ lL. 2§_ _R_ .22_ --jl•

1 ..- 12" ..• I"" ·~~ ' - '"' 1800 -- I.::: .,.:;J=----

~-=-600 ~ __ ::C::J• ·~· 100

80 --- >:!!!; 150 200 ~ -·· 400

~- 400 ~--

... ,_ ,_ ·~ ....

3000 3000 ~ - 2500

--BOO

15o =------··--

~ 1200

380

""-:!:

220

• tJO .... 100

400

~

' I • •·•

, .:·' I -Js I

-. ~--~ 5C

-1 I'I'C"C ---- -;.~ ----.__ :

~( - I 100

70 200j

~-I 300 "lso

·~

100

460 ~

I --,.I

PROFILE c-c·

.s::-126 _!!..Q_ JlL__

60 90 70

400 300 400....__

PROFILE D- D'

....!.!L. _l!L_ 120 D'

1100

50

IELEVJ

-iO I

J-50

-100

(

LEGEND

~- soun.dtnq IUlmtac'

--'- soundinq locdflon

2600 •.!sistiv•ty v')llle loll"' ft_J - •o• resistivoty layer (LRLJ

FIG.IH RESISTIVITY CROSS SECTIONS

DELAWARE CITY, DEL.

Prep'lro!d by JOHN ' ll'l(t< 0( T •'Jb<"

SCALE

•rolontontat - I lf\~t\ ": 400 ftt

vuticol - ••ncl'l : 100 lu

(

~

;;-.' < c

C"'

'

( ' '. ' ! .• i 1 • • i •

l !

I r . /

J A . ' --- -I

--I o •;

C ~."-;f"tl• . - .. '

were not smoothed or otherwise processed prior to contouring. Some of

the minor contours may represent errors or atypical conditions especially

where derived from a single value.

Total relief on the LRL is' about 120 feet with a high point at sounding

13 and lowest point at sounding lOS near the southwest corner of the

map. Overall trends are readily visible on the map. The LRL crests at

the eastern side of the area.and from there slopes to the south, east,

west and north.

Many minor features resembling ridges and basins are visible superposed

on the slopes of regional relief. The complex of shapes is difficult

to explain at present but is doubtless the combined result of structural

deformation and erosion. Other local features may be due to presence of ·~

local clay layers in the Pleistocene deposits.

11~~00116

ROUXASSOCUCIWS INC

APPENDIX C

Water Table Elevations

Measured on:

May 27, 1982 August 10, 19 82 October 13, 1982

AR3001 17

or::r u:.t~i ( r:

Table C-1

Well Number

OW-l OW-2 OW-3 OW-4 OW-5 OW-6 OW-7 ow-a OW-9 OW-10 OW-11 OW-12 OW-13 OW-14 OW-15 OW-16 OW-17 OW-18 OW-19 OW-20 OW-21

*MW-1 MW-2 MW-3 MW-4 MW-5 MW-6 MW-7 MW-8 MW-9 MW-10 MW-11 MW-12 MW-13

*See Figure

Water Table Elevations (See Figure C-1 and Plate 1 for well

locations)

Elevation of 5/27/82

35.29 35.32 34.82 36.31 34.58 ' 41.56 42.17 41.60 40.95 40.84

35.14

45.55 45.84 44.47 44.64 44.77 44.87 45.39 45.42 45.10 43.21 42.35 42.45 42.34

Water Table (ft. 8/10/82

36.42 36.36 35.82 37.61 35.5 7 42.84 43.63 42.55 41.56 41.13 43.50 36.09 41.14 36.95 35.59 33.62 36.47 29.14 40.00 35.13 35.83

(Rta) above mean sea level)

10/13/82

36.40 36.32 35.64 37.56 35.31 41.56 41.88 41.48 40.92 40.61 43.27 36.01 40.58 36.76 35.4 8 33.35 36.45 28.6 8 38.90 34.55 35.41

D-1 for locations of MW-Series Wells

AR300I18

• • • 0 u

• • • ' • • u

• • • •

I Stouff•r tCSt Plant)

Forii'IOSO /Stouffer Property Boundary

I I I I I I I I I I I L __ ---,

-;;;;;;;;;;;ij~~~~~ I

FORMOSA (PVC PlANT)

DOffice

~···"·" ,...-----------' Df'llt[WAT€11

lt!SfltVOIII

=~Oflll WAT[II' :

WASTE SEitiiOUt 1

POliO llltaTIItUIT o·MII'·I WATI:II T

MO-o> --odp S I __ ,, ~>..-- --· • -:·-· . , ... ···-~ tUIIIAL ~ITS~~~ ... ·r·-7-~····: • I fJII.&OE I Mil'·$

: OATCH • 1111'•1 ·o .. IT :

Dw·•e I e ~·-· 011'·1(1.

DW• lA .. 011'- I

_,,_, •At.Eit WELL

•o•-•

o•-• • I r-----. ' L..-- __ L___..le r•·ID

------.1 .,,_,. •"""'

•o•-~

•"·-, tl/11/fSON II'CLl. e

fltAr IICLL

e .DII'·tl

OU pQN T pARKWAY

0 tOO 400 ,T

:1 .,

• • i

_, • •I • • • I

Locations of MW-Series Observation Wel~~ ~

,-; m ·~ --~ - ~->

_ .... e •ooo

STAUFFER CHEMICAL COMPANY Del ow or• City, Otlaworo

<-••o•• SC:&ll~·-~~·1

'"""-' P. H. Roux .t. _..,.((, .. ~~~, ... lC: -1 .•.ssoctales.lnc.,_,.~~, ....

( '' ') fl .u

APPENDIX 0

PUMP TEST MEMO

AR300/20

The following method was used to derive an estimate of

missivity in the Columbia aquifer at the Delaware City site.

Ten selected observation wells were pumped at a rate of 10 gpm

for approximately 15 minutes each, to determine their specific

capacities. After the specific capacity has been determined,

the following formula relates the specific capacity to the

transmissivity of the aquifer:

264 log

T

( Tt

2693 r 2 S w

(1

) - 65.5

Q where s = specific capacity, in gpm/ft; Q = discharge, in gpm;

s = drawdown, in feet; T = coefficient of transmissibility, in

gpd/ft; S = coefficient of storage; rw ~ nominal radius of

well, in feet; t = time after pumping started, in minutes.

The main limitations of this method are: (1) the aquifer should

act ideally; (2) wellloss.should be negligible; (3) the well

should be screened through the total saturated thickness of the

aquifer.

AR300121

ROUX *SSOCIATEB INC

----·

- 2 -orw rr: n

(Rcc:)

The Columbia is not an idealized aquifer (homogeneous, isotropic,

and infinite), so the calculated T will be an approximation of

the actual T. ~y running the test in 10 wells, a reasonably

accurate range over the entire study area was calculated.

Well loss can introduce further inaccuracy. However, because

the low pumping rate (10 gpm) did not cause large drawdowns,

this effect was minimal.

Finally, the problem of partial penetration into the saturated

portion of the aquifer by the observation well screens was

compensated for by the following formula:

Q. s

p = cos

(1

where K = ratio of length of screen to saturated thickness of p

the aquifer, fraction; r = radius of the pumped well, in feet; w

m = thickness of the aquifer, in feet.

1 Walton, W., 1970 Groundwater Resource Evaluation, p. 314-321

AR300122

ROUX AS80CIA1'11S INC

Stauffer Chemical Co. Inter-Office Correspondence

Page 2 of 4

Sample No.

4945-35-1 -35-3

4945-35-5 -35-6

4945-36-1 -36-2

4945-36-5 -36-6

4945-37-1 -37-2

4945-37-5 -37-6

4945-38-1 -38-2

4945-38-5 -38-6

4945-39-1 -39-2

4945-39-5 -39-6

4945-40-1 -40-2

4945-40-5 -40-6

4945-41-1 -41-2

4945-41-5 •41-6

4945-42-1 -42-2

4945-42-5 -42-6

TABLE I

Delaware City Plant Area Soil Test Pits

Samples Analyzed

Test Pit

1 1

1 1

2 2

2 2

3 3

3 3

4 4

4 4

Depth

1.4 ft.

6 ft.

2 ft.

7.2 ft.

2 ft.

'6. 5 ft.

2 ft.

6.5 ft.

5 ·3 ft. 5

5 6. 5. ft. 5

6 3 ft. 6

6 6 ft. 6

7 3 ft. 7

7 I\R300123

7.4 ft. 7

8 2 ft. 8

8 7.5 ft. R

• Stauffer Chemical Co. Inter-Office Correspondence

Page 3 of 4

TABLE II

Quality Assurance Data

Analysis of Delaware City Plant Area Soil Test Pits for

ORIGINAL (Red)

Vinyl Chloride Monomer (VCM) and 1,2-Dichloroethane (EDC)

Spikes

(1) Spiking the soil before mixing with monochlorobenzene (MCB)

Test Pit i2 Concentration s2iked % Recove~ VCH EDC VCM EDC

1st 1 ppm 1 ppm 28.3% 85.3% 2nd 1 ppm 1 ppm 35.3% 85.3% 3rd 1 ppm 1 ppm 18.4% 82.4%

Average Recovery = 27.3% 82.3%

(2) Spiking the soil and monochlorobenzene (MCB) mixture

Test Pit #5 Concentration SEiked % Recover:z: VCM EDC VCM ID2£

•, 1st 5 ppm 5 ppm 83.8% 89.8%

2nd 5 ppm 5 ppm 83.7% 91.5% 3rd 5 ppm 5 ppm 84.3% 86.4%

Average Recovery = 83.9% 89.2%

nR300t24

.. = . .. • a. G.

~

• 0 < :I • 0 • " 0 • - 2 ---

u - ~

• -z -' 0 . • 0 • u . - .... . - - ~ -I-

'll -~ "£< . "' u

., Q::U :r -......-o - .. • ,.. ~ .J

• .. 0 ::: ... , -..J .. . ..J ... 0 X -:w ... • ::> 0, =-• -~ ~ .. =-.. .. w -· • Ill ,# • ~

• • •

- -.. c g .2 • "' u ~ • Ill • • ..

' .. ., 31: '.':_

+ .. c 0 s· -... 0

u j 0 -c( .. 0

0 ~

• 0 • •

z -1- .. .!i ... -' "'

(I. 0

-' t.

<I " • G. )- It) )( I

~ 0 ... I

0 • ..._ct

/ -

,... -, \.._ \ I \ " , I

.. - / \

----- - ... - -·. ·"·-

' . -

- _, -.. -... --.-·-;; .:._:....:-"i'":=- •

(; ' ""'AL •• 1 U1 fl

(iitci)

APPENDIX E

Analytical Data

~R300I26

ROUXASSOCIATESINC

House

TABLE I

VCM and EDC Concentrations in Residential Wells - Delaware City

GC and GC/MS Data - ERC 4/20/82 Sampling

Sample No. Concentration ·-· G~ ,... GC:i!':!S * VCM

Gray 4945B-29

Tunison 4945B-30

L. Alger 4945B-31

G. Koval 4945B-32

EDC ·· VCM "-ND+ ND ·~"' '"-./"-

~ '~ "-~~/ "., ')

ND ND ··''-~ ~o ··, '-'·

0.9 ppm 3.8 ppm·, .. 230 ppb '

-.. ..... ·' 0. 9 ppm_ .~.· 8 ppm.. 250 ppb

·,

1. 5 pp'b '{): 4 ppb .· ·-.,_. '.... . . . ' ' "

/<, ~- '), / ,,, '"" / >-. ""'' '.,)

1 0-'\"-~v A' ' ' ,f

5 ppb

l ..... ,, / '/ GC/MS data is semi-guantitat:iv'e~-. used for confirmation of

GC data _(~ '...,~~'-/ *

ND = not detected . ~ ~~~ 1 1 . . f (d('J -~. . ) LLD = ower 1m1t o . etect1on ++

'':) VCM- Vinyl Chloride,Monome~ EDC - Ethylene Dich~~:ia~

',•,

,:.ooo.oa.a

/

' . ·,

'•

' ' '·. ·, '~.

/ '-.,/)~) / (>>."-/>

,:--,, . ' .. / .' ... , (. "-"

', ..

t!R300127

EDC

ND

ND

780 ppb

780 ppb

1 ppb

I

" 'I :I 'I 'I

!I ,. '

House

T. Gray

Tunison

I") 1 , \ ;· . "

.' I I I • J J .·"

k - .1' / / . .. ,'

' ' /

Sample No.

4945B-29

4945B-30

VCM

. + ND

ND

TABLE II

VCM and EDC concentrations in Residential Wells - Delaware City GC and GC/MS Data - IT Analytical

4/20/82 Sampling

Concentration (ppm)* GC

EDC TCE VCM

ND ND ND

ND ND ND

GCLMS EDC

ND

ND

L. Alger 4945B-31 1. 2/1.2 6. 0/5. 8 9.6/8.8 ppb 840/820 ppb .5.2/4.5 / "

G. Koval 4945B-32 1. 2/1.3 /5(6fS;7 9. 5/9. 0 ppb 920/690 ppb I '- , '.'

LLD++ 5 ppb -~

1\, ppb' .· 1 ppb

.. -. /

/

* +

All analysis results reported in duplicate' (N/N)

ND = not detected

++ LLD = lower limit of detection

VCM - Vinyl Chloride Monomer

EDC Ethylene Dichloride

TCE -~richloroethylene =c ~

~ ~

N co

··--· -----·

1 ppb

.' '·-->' . ,·

/' '

' /

·-

4.7/5.7

1 ppb

TCE

ND

ND

11/9.5 ppb

14/16

1 ppb

"" -, . :-..) . ~~ .I L_ ~ ~-

·"- ... ,...

ppb

v ~

g 0

• •

TABLE

Determination of VCM and EDC in Residential Well Samples - Delaware City Plant EPA Split Samples

•• , 1 4/27/82 Sampling ' .- J I ·, ..... _

Sample .t:/

Alger Deep Well 10:00 a.m.

Sample Bailer Blank 10:15 a.m.

J\lger Shallow Well 10:30 a.m.

Tunison Kitchen Tap 10:57 a.m.

LLD++ :t:a :0 (...,)

0 0

' Designation

VCM

4900-65A,B 1.1 ppm

,/ ~ • ' . I .

4900-65-"l,·i2 '.. NO* . ' /. . .. ....

4900-66-A,B

4900-66-C,D

/

/ ... , .·; NO / .. ·

I {/ /,·

:

Detected**

2.5 ppb

Concentration

Gc 1

EDC VCM

4.3 ppm > 300 ppb

NO NO

NO NO

·Detected** NO

1 ppb. 5 ppb

GC/MS 1

EDC

> 500 ppb

NO

Detected*'

ND

5 ppb

~ 1 GC/MS used for semi-quantitative analysis and identity confirmation; GC results reflect \.0 quantitative VCH and EDC values.

* NO - not detected

**

++

Detected - compound was detected, but cannot be accurately quantitated since it is near the limit of detection.

LLD - lower limit of detection

C) ......_ ::t> ~­<DC> C>.,­'-~

.h ......

OP.IGINAL (Red)

VCM & EDC Content of Samples Taken for the Subsurface Water Flow Study - Delaware City CS2 Plant Site

Purge & Trap - GC/MS**

~~~ Design_a__!_i_<;m VCM

OWl

OWl FB

OWl BB

OW2

OW2 FB

OW3

OW4

OW4 FB

OW4 BB

OW5

OW5 FB

-5/6/82 390 ppb

-5/6/82 t

-5/6/82 *ND

-5/6/82 140 ppb

-5/6/82 *ND

-5/6/82 *ND

-5/7/82 >30 ppb

-5/7/82 *ND

-5/7/82 *ND

-5/7/82 >100 ppb

-5/7/82 *ND

Gray's we11-5/6/82 *ND

G-1 -5/6/82 *ND

OW4 Dup •. -5/7/82 NA

* LLD '

'

EDC

520 ppb

t

*ND

950 ppb

*ND

6 ppb

> 50 ppb

*ND

*ND

> 300 ppb

*ND

*ND

*ND

NA

-~· 5 ppb

t Detected near the LLD, but not quantifiable

FB Field Blank

BB Bailer Blank

NA Sample Not Analyzed

Purge & Trap - GC/FID

VCM EDC

510 ppb ', ."· 760 ppb . ' ' ,

*ND *ND

NA

200 ppb

*ND

*ND

200 ppb

*ND *ND

410 ppb

*ND

*ND

*ND

200 ppb

l. 5 ppb

NA

1. 8 ppm

*ND

t

1. 2 ppm

*ND

*ND

1.2 ppm

*ND

*ND

*ND

1. 2 ppm

0.4 ppb

** GC/MS data is semi-quantitative, used for confirmation compound of identity, GC/FID data is quantitative

~R300130

OOO·O:IA

~·

. .. . . ". ' .... . • ·: .. ,J , ______ _ r

VCI~ and EOC Content of SIUr<pl.es Taken for the "Subsur'fa·ca· \'lat·e·t·' 'F-low Study· ._ Delawar·e City CS2 Plant Site

(Samples collected on 5/25 and 5/26 ,·. 19 82)

.SAmple GC/P'IP GC/~IS

1) toe"i 51nat:ion · VCM ~ ~ EOC - -fhld Blunk 1' •• l ppb ~" tiA 0~1-lA IllS tJD* No- NA N~

OW·l~. Fa NO tlo tlD ND Olf•lA 1' NO NO ND Olf•S 1'B NA NA NO NO

ow-s 3l.O ppb l..3 ppm 1.3 ppm .1.6 019-6 l"B NO l ppb NO NO oW-6 330 ppb 17 ppm 31-0 ppb l.3 Oil-7 llD '~-· l ppb 'I> 3 ppb NO NO 0 >'i-1 l".B IV 1 ppb ·IV l ppb NA NA

0\'1-7 ~50 pppU 7.8 .ppm•• 600 ppb 2.3

0''1-8 l"B t~O tlO NP NO c~-8 330 ppb l.l ppm 460 ppb l.ll

0\o/-9 l".B t NO NP tlO 0\~-9 so ppl> 790 ppb 60 ppb 866

OW-10 FB NO NO NO ND

00-lO l.3 pprn ll . ppm 1.5 ppm 2.0

<M-12 FB t ND tlD ND

01'1-12 DB ND ND ND NO

OW-12 .coo ppl.> 3.7 ppm 560 pp"l:)U 2.7

Recovet·y SOt @ -'00 ppb 90'i @ l ppm 27\ @ 50 ppt> 29\ @

ppm

.ppm

ppl'tl

pp:u

ppb

ppm

pprn••

so ppl:

,._ 1.-LO l ppb 0.5 ppb 5 ppb . 5 ppb

.... Average of Duplicnte Analyses

1 Dete:::tetl near Ll,O, Not quantifiable.

r1r.l.~o·1 s

Ft3 • Field Blank B9 = Bailer Blank IJP • None o~tected

"' "' . !'lot Analyzed

AR300131

TABLE I (' ... ,.

' ' VCM, EDC and Chloroform Concentrations in

Residential Waters and Observation Wells at the Delaware City Site

VCM EDC CHCl3

Alger 6 a.m. NO* NO ll7 ppb**

Alger 9 a.m. NO NO llO ppb**

Alger 9 a.m. FB NO NO NO

Koval 6 a.m. NO NO llO ppb**

Koval 6 a.m. FB NO NO NO

Koval 9 a.m. NO NO 118 ppb**

Koval 9 a.m. FB NO NO t

Alger Shallow NO NO NO

Alger Shallow FB t NO NO

SW1 ND t 18 ppb

SW1 oup. ND t 17 ppb

SW1 BB NO ND NO

SW1 FB ND ND ND

OW3 t 4 ppb t

OW3 BB ND ND ND

OW3 FB ND ND t

OWll 14 ppb 950 ppb 7 ppb

OWll Dup. 7 ppb 740 ppb 6 ppb

OWll BB ND ND ND

OWll FB ND NO ND '

OW13 I ND ND 2 ppb

OW13 BD ; Nll NIJ NO

OW14 ND ND l ppb

OW14 BB ND ND NO

Ol"i'lS 540 ppb 7900 ppb 2 ppb

OWlS BB t t t

OWlS FB t NO t

OW16 ND 9 ppb t

OW16 BB ND

AR300132 2 ppb t

; TABLE I '

(';;:") (concluded)

VCM, EDC and Chloroform Concl3nlruUons in Residential Waters and Observation WellH at lhu

Delaware City Site

VCM EDC HCCl3

OW17 140 ppb 2100 ppb t OW17 BB t t t OW17A 2S ppb 400 ppb NO

OW17A BB t t t OW17A FB t ND t OWlS ND t t OWlS BB ND ND t OW19 ND ND ND

OW20 ND t t OW21 ND ND ND

LLD*** 2 ppb 1 ppb 1 ppb

Average Recovery 70% @ 99% @ 96% @ 15 ppb 55 ppb 150 ppb

*ND = Not Detected

** = Identified by GC/MS; Quantified by GC/FID

***LLD F Lower Limit of Detection

t =>.,Detected Near the Detection Limit; Not Quantifiable

BB d. Bailer Blank . FB b Field Blank

Dup.= Duplicate

tiR300133

TABLE I

GC/MS Analysis Results of EPA Split Delaware City Monitoring Well Samples for Viz1yl Chloride Monomer (VCM),

1,2-Dichloroethane (EDC) and Trichloroethylene (TCE)

Concentration (nnb) .. ·-----------~

Sample(a) VCM EDC / TCE ' '

MW-1 ND (b) " '· '

ND - ·. NQ-')

' ' " / MW-3 ND ND '· ' ' ND / _.·"'-., ' ' ... ·. .'

MW-3 (duplicate) 8.7 86 '':: ' ' ''"8 1 ./.' ' .... , ·,_.,,· .

MW-5 29 4 5 •. '· ', ' 8.1 , . ..,.. ... ·, ,, / '· '· .,

MW-8 86 · 1. 9 ppm 13 ., '

MW-9 190 ·:· 6 . 8 ppm 10

MW-10 65 1.4 ppm 8.2

MW-11 ND 847 (d) ' .. '.

MW-12 81 150 (d)

MW-13 10 58 (d)

Field Blank ND ND ND

LLD(c) 5 5 5

(a)

(b)

(c)

(d)

'•._

/·--,., •· <... •._./-· >-\ ' / ' ·­' '' \ Split monitoring'we)\'samples collected on 3/10/82 by

ERC personne~. and Ecology & Environment Corporation. . .· < ' '-.

·. "' ' Designatis' ~not,~etected''. ,. .. '. '., , __ Designate~ :'16wer limit of detection''.

Detected·-~ea"r···the LLD, but not quantifiable.

. . . '• ·.

'

~R300/34

TABLE II

GC/MS Analysis Results of EPA Split Delaware City Surface Water Samples for Vinyl Chloride Monomer (VCH) , 1,2-Dichloroethane (EDC) and Trichloroethylene (TCE)

Concentratio_~_(£Eb)

Sample(a) VCM EDC TCE

* S-1 . ND(b) (d) NO

S-2 ND ND NO

S-3 ND (d) NO

S-4 NO NO NO

S-5 NO ND NO

S-6 ND NO NO

S-7 NO NO NO

S-8 ND ND ND

Field Blank ND ND ND LLO (c) 5 5 5

(a) Split surface water samples collected on 3/9-l0/82 by ERC personnel and Ecology & Environment Corporation.

(b)

(c)

(d)

Oesignates."not detected".

Designates·~· iow.er limit of detection". . . '\.,.'' ' . :· ,

Detected nea.r the LLD, but not quantifiable.

* Se~ Fljvre.. E -I -t'or

PoirJ \...ocC~.tion~.

tiR300I35

;

I

TABLE III

GC/MS Analysis Results of EPA Split Off-Sjte (, Well Sampleb for Vinyl Chloride Monomer (VCM),

1,2-Dichloroethane (EDC), and Trichloroethylene ('l'CE)

Sample(a)

:Jfr W-2

1 W-3

~,._ W-5

*-¥- W-6 ·

Field Blank

LLD(d)

VOl

ND (b)

NA(c)

ND

. · . . ~ .. '· ' ' ',

NA ·.

'•

< "-... ' ·: ; (a) Split off-site well samJ2les collected on 3/10/82

personnel and Ecoldgy,&•En~lronment Corporation. ~- ,, \.'"·

(b) Designates "not :'det~~t~d·/. "~\--(c) Sample not analyzed~

(d) Designates-~e~ limit of detection". '/>'~ <.;-:--.._.)

·< ·-/Y'-' / >>.._ <v/'Y

..... ~ ..... , .. ...,. '-.., //

-* loc."'+'olo!l< e!+-. ' Sc.'Wip \ ,.;, ' .

E-\ .

. . '•. ;'

•-.w• ••· ...... , '

... ---- '1 /"-· I " . . -·

NA

9.2

7.1

ND

5

by ERC

6-3

., 0 c .... "'

G- 4\ \.ocoted \\ul •IOOOft. to west

of this point)

:P . :0

w 0 0

w '_,

• flail road

STAUFFER

S-8 •

l.kl.tA' ·S-2

WRANGLE

0 rooo

·6-5

0

"' <" ,. ... ,. ~

"'

~ -N-

~

~ -L

"' ~ .6-2 (Approximate location)

GETTY

II 0 II- D tilL\.

4000fT.

!k)I.J[(T

"""'Pjl.~( c "01"

-LEGENO­

G-3e Getty Well

Dom11tic Well •-• ... S-5. Surface Water Sampling Point

REGIONAL

LOCATION MAP ""' . ·'

''·'

STAUFFER CHEMICAL COMPANY Delaware City, Delaware

~OMP•,(:, 8> Ol(,,"

P. H._Roux cl ~£Pt.~<tos' E-1 Assoc1ates.lnc. -o;rcr 1111<>11 1 INf:lle-

Date

4/27/82

4/27/82

4/27/82

4/27/82

4/27/82

5/06/82

5/06/82

5/6/82

5/06/82

5/06/82

5/06/82

5/01/82

6/01/82

•-s~ 5/01 /ll2

J • S I 6.'01 /82

.w-~ 6/01/82

..: .. ~·n /f':

Ti"'e

10:00

10:30

10:30

II :00

09:15

09:30

10: 15

II: 20

10:50

10:45

II :07

II :40

I I :50

12: 10

)3:35

SAl-'.PLE LOG FTELD TRIP REPORT

DELAio:ARE CITY PVC PLANT TDO NO. F3-8204-05

EPA No. DE-07

Location Well Depth

(below· ~r~tie)

Kova]-A]~Pr O~~p "ell

i'\;;il~r Blank

Kovai-Air~r Sh.>ll.ow "'<·II

T•:-nnyson's \-!cJ 1

Sample !'lank

Sample Blank

Bailer Blank

Obs~rvation lo:ell - 3

Ob~ervat ion t{e II - 2

Ob~.,n·at ion \-.'e 1 1 - I

Grey's Home t;e II

Observation \\'e 11 - 5

0hsc-rvtttinn !_,.' P. 1 1 - 7

Fai rwcath.,r Y.;rine Cr·r.t~?r

Jones' Well at 2224 Corh i ct :2 2.0). ~ Corbitt Rd. We II

r..:· t t ~· ~·e J J ClR-1.

ltR~00/38

Rd.

60 ft.

32 f t •

68 f~.

66 ft.

66 It.

60 f t .

32 f t .

60 f r .

30 f t .

"l.Rf: f r •

S ~- {:',:) u i'C

EP2. '

.f.r I DC: ~.I, o"' s

l<ater Level (bt'low ~rade)

1 7 f t •

41.21 ft.

37.74 ft.

41.21 ft.

33 f t •

1 ;. f t .

. .:. r .. . '

' i li :I •'

C-d-1-t !#ell

, oR-1 \

2U' :l--\1 f.\' . \ well 0 ·

.:To--.-:1-"li-\J \

\

\

C~<.•·:r1 sITE NAME : be~ C \-7. l>V (. "?lr.ot ( rf o c' J

TDD NO.: fl· 'nO"i ·0$

EPA NO.: ~i_~.L__ Tl TLE : mu / 4 kWht" C

--,FIGURE NO. _-L.._

N

5-f~~,~~'/ · be.~~ C.r~~ 'bE'

f 3· i:l.O'I'·O.lo"'" l)£~7

•

\ \ \

, ow-5

--- ----------

cr•;'RCE: _ $(/? ~lch:./. ____ _________ - .. Fl.!:W~t= £~2 C I. I ~ •• ,

\

\ .,_. I '

' '

- ' ••• - - - - - - - • - - .._·- • '-- - .~, - ...... <::;' J J ..:e

.. - •,,.. .,. TJ..BLE I

c '"':! ,. t ;~.'.l

( ; : .ci)

Analysis of Delaware City Plant R<:sidential Hell \·later for Vinyl Chloride Monomer (VCM) and 1,2-Dichloroethane (EDC)

·Analysis by Modified EPA Method 624 Purge and Trap Gas Chromatography With Flame Ionization Detection

Samples Received 11/11/82 Samples Analyzed 11/17/82 - 11/19/82

Concentration (ppb) ()Jg/L) House • Sample Name vcr~ EDC Other Compounds -

1 Shetzler ND* ND ND

2 P. Wilson ND ND ND

3 T. Streaker ND ND 1,1,1-Trichloroethane**

4 J. Davidson ND ND ND

5 R. Wilson ND ND ND

6 J. Spicer ND ND ND

7 B. Scullion ND ND ND

8 G. Goldborough ND ND ND

9 c. McGhee ND ND ND

10 H. Keller ND ND ND

11 E. s. Leonzio ND ND ND

12 J. Wiley ND ND ND

13 H. Kline ND ND ND

14 E. Kraemer ND ND ND

15 Moody (not sampled)

16 R. Barlow ND ND ND

17 B. Pennington ND ND NO

Lab Blank ND ND ND

Lower Limit of Detection 4 1 Not Determined (Estimated)

*ND = not detected

**Not quantitated, but estimated at 20-30 ppb

A R 3 Q·O I 4 0 .

•

• • stauffer CheMical Co. -.:nter-Office Correspondence

TABLE II

Quality Assurance Data

Page 3 of 4

0 r.; ,__.!:-:f. i

:Analysis of Delaware City Plant Residential l'Je11 Hater Samples for Vinyl Chloride Monomer and 1,2-Dichloroethane (EDC)

Sample

House #5 House #5 House ll5

House #16 House U6 House #16 House #16

Analysis by Hodified EPA tlethod 624 Purge and Trap Gas Chromatography With

Flame Ionization Detection

Samples Received 11/11/82 Samples. Analyzed 11/17/82 - 11/19/82

SPIKES

Concentration Spiked % Recovery EDC VOl EDC VCM

4.0 ppb 122% 4.0 ppb 112% 4.0 ppb 112%

l.S ppb 8.4 ppb 89% 109'i. 1.8 ppb 8.4 ppb 107% 10 8% 1.8 ppb 8.4 ppb 106% 111% 1.8 ppb 8.4 ppb 94% 1on

Avg. % Recovery EDC VCM

118 ! 5%

99 ! 9% 10:?

I'IR3D0141

2'

•

... ~~~-~-· ~ ·~~ , .. , .~-~J-~"~~~]~ ·--------

.?) -s· L, +-• ~

~

~ ' ' G

- -.. ... 3 <:>

' ..: • • • -... J "' "' • ,, t ~ • .... < -4-q-.. '-'

·< . -- ' ~ .. -1- ... . ...

o< .J> ., • • . c:

"'t

- ~

~ :J " 3

1 . '­

c ' 0

"' &

... -.

... • 0

c

E "' :.. ~ ('> ,... Ci\

'J:: ("

r

70 'Q

,....._ 'N -I

..,J ,.., \.,/

--•

L . ·---~-·-- -~i-11)---r

J;.T. 13

~S~IfT?.t.£~

p.l.llrL'!o<J'I

~ "'t ()

iS SOI!E41tl1 ~ ;

~ !i I

B

~){LINE: .

\) 1'1\

~ i (I'>

-4' .. ~

ts- ,..., )

AR3001~2

•

Sample #

4900-83 4900-84 4900-85 4900-86 4900-87 4900-88 4900-89 4900-90 4900-91 4900-92

Lab Blank

Lower Limit

TABLE I

Analysis of Delaware City Plant Area Monitoring Hell \'later for

Vinyl Chloride ~1onomer (VCM) and 1,2-Dichloroethane (EDC)

Analysis by Hodified EPA Hethod 624 Purge and Trap Gas Chromatography l~i th

Flame Ionization Detection

Samples Collected 11/30/82 Samples N1alyzed 12/6/82 - 12/13/82

Concentration (ppb)

Well VCH EDC Other

0\'l- 2 5 ND* ·No G-4-1-1 ND ND otv- 2 6 ND ND OW-27 ND ND

()Jg/L)

Compounds

ND ND ND ND

01'1- 2 8 ND ND Detected** 0\'l- 22 NO ND ND Ol'l-23 ND ND ND 01'1-29 ND NO ND Oll- 24 NO ND ND Ol!-1 0 Detected*** Detcctc.d*** Detected**

ND ND ND

of Dptecti.on 2 2 (Estimatr>d)

*ND = not detected

**Detected; compounds samples 87 and 92. reported at a later

other than VCM or EDC were detected in These will be identified by GC/HS and date.

***Detected; Due to a problem with preparation of standards, VCM and EDC could not be quantitated in Sample 92. This well was resampled and results will be reported at a later date.

~R300\43

·-

Sample #

4900-GG

4900-86

4900-86

TABLE II

Quality Assurance Data

Analysis of Delaware City Plant Area Monitoring Well Water for

Vinyl Chloride Honomer (VCH) and 1,2-Dichloroethane (EDC)

Analysis by Hodified EPA Hethod 624 Purge and Trap Gas Chromatography lh th

Flame Ionization Detection

Samples Collected 11/30/82 Samples Analyzed 12/6/82 - 12/13/82

SPIKES ·

Concentration Soiked %

l~ell VCM EDC VCM

OVI-2 7 8.3 ppb 11.0 ppb 74%

OH-27 8. 3 ppb 11.0 ppb 76%

o1v- 2 7 8. 3 ppb 11.0 ppb 70%

Average Recovery = 73%

ORIG!Nt,t (R~d)

Recovery

BDC

95%

84%

91%

90%

AR300144

• 'J'ABLE II

Quality Assurance Data

OkiGINAL me d)

Analysis of Delaware City Area Monitoring Well Water for Viny 1 Chloride ~lonomer (VCM) and 1, 2-Dichloroethane (EDC)

Analysis by Nodified EPA Method 624 Purge and Trap Gas Chromatography with Flame Ionization Detection

SamEle No.

4945-51 4945-51 4945-51

Average %

4945-49 4945-49

Average %

Samnle No.

4945-56 4945-56 4945-56

liver age %

Samples Collected 1/6/83 Samples Analyzed 1/10/83 - 1/15/83

Concentration SEiked % Recover:t \~ell VCH EDC VCM EDC

G-4 7.8 ppb 10.3 ppb 60 G-4 7. 8 ppb 10.3 ppb 58 G-4 7. 8 ppb 10.3 ppb 58

Recovery 59

01'1-25 14.0 ppb 14.6 ppb 85 Q\q- 2 5 14.0 ppb 14.6 ppb 80

Recovery 83

Samples Collected 1/12/82 Samples Analyzed 1/12/83· - 1/14/83

Concentration SEiked %

Well VCM EDC VCM

OW-22 7. 6 ppb 10.0 ppb 84 OW-22 7.6 ppb 10.0 ppb 85 01'1-22 7.6 ppb 10.0 ppb llO

Recovery 93

90 92 95

92

102 97

99

Recover:t

EDC

95 96

106

99

AR300145

,.-"'"""

• TABLE I 0 r-. ~. !

. ·• ..... ~ ' .. (flc~j

Analysis of Delaware City Area Honitoring Hell Nater for Vinyl Chloride Monomer (VCM) and 1,2-Dichloroethane (EDC)

Analysis by !!odified EPA Method 624 Purge and Trap Gas Chromatography with Flame Ionization Detection

Samples Collected 1/6/83 Samples Analyzed 1/10/83 - 1/15/83

Concentration

Sample No.

4945-44 4945-44 4945-45 4945-49 4945-51

Well VCH

0\v-10* 740 ppb 0\'1-l 0 duplicat:e 710 ppb OW-16 ND** 0\'/- 2 5 ND

G-4 ND

Samples Collected 1/12/83 Samples Analyzed 1/12/83 - 1/14/83

EDC

27 ppm 27 ppm ND ND ND

Concentration

Samole No. Well

4945-55 0\V-26 4945-56 OW-22 4945-57 OW-29 4945-58 OW-5* 4945-58 OW-5 4945-59 G-4A

LOh'er Limit of Detection

duplicate

VCM

ND ND ND 400 ppb 390 ppb ND

2 ppb

EDC

ND ND ND 1. 7 ppm 1.8 ppm ND

2 ppb

*Compounds other than VCM or EDC were detected in well samples OW-10 and OW-5. These will be identified by GC/MS and reported at a later date.

**ND = not detected

AR300146

Stauffer INTER-OFFICE CORRESPONDENCE oROGIHATIHG o•"c' Dobbs Ferry

to <Loc.r•o•• Westport

CO!"• ; ~ s. F. Adler*. s. Altscher* H. J. Caspers c. H. Elkins D. s. Hackett T. A. Marolewski D. McGrade J. D. Sheehan Central File

Attachments

*Memo Only

FROM

SUIJI.CT

p.RQJ:

RRA#:

KWDS:

S. L. Urquhart om 1/24/83

VCM and EDC f~~elaware City ORIGINAl ·Plant Soil SampY~ (Red)

~'ecS; ~¥ill EnvironmeQ..al VS$!~die~q. Delaware 739705 ··.q...,.l 4-~ lfi¥

'~ '/' 82120 v~~ Delaware City, WRC, Test Pits, VCM, EDC

8312-0028

ERC personnel assisted Stauffer's consultant, Paul Roux, Assoc., in collecting soil samples on December 16, 1982. These samples were collected from eight newly developed test pits near the former Delaware City PVC plant (see Table I and Figure 1), in an effort to explain previously reported levels of vinyl chloride monomer (VCM) and 1,2-dichloroethane (EDC)" in monitor­ing well ON-10.

Samples were analyzed at ERC for VCM and EDC by gas chromatography~ flame ionization detection (GC/FID) according to the WRC procedure described by K. K. Curry and R. w. Buxton in their memo to J. Horton of 12/16/82.

VCN was not detected in the samples (LLD = 0.1 ppm). EDC was detected at the LLD, ,1. 0 ppm, in the sample taken from the upper depth in test pit #3. Due to chromatographic interferences in the sample taken from the upper depth of test pit #1, the lower limit of detection for EDC was 10 ppm.

The percent recovery of VCM and EDC for these samples was determined by two types of spiking experiments. Experiment 1: The soil was spiked before mixing with monochlorobenzene (MCB); Experiment 2: The soil/MCB mixture was spiked. The quality assurance data is in Table I. ,

Work Done by: W. Joyce

SLU/jmr

P. Kaufmann s. Urquhart G. Young

ci.Y.}f €a""r"'"t_.,.-'\...'V'

AR300147

[SAFEGUARD COt~PANY INFORMATION