(Red)

FIELD INVESTIGATIONS OFUNCONTROLLED HAZARDOUS WASTE SITES

FIT PROJECT

TASK REPORT TO THEENVIRONMENTAL PROTECTION AGENCY

CONTRACT NO. 68-01-6056

Hydrogeological Reviewof

Delaware City PVC SiteTDD No. F3-8111-04

EPA No. DE-07

Revision Date: June 3, 1982

Presented to: Linda Y. Boornazian, Acting DPOEPA Region III

Prepared by:Chang Rang LeeFIT Region III

'phf G. 'HcGovern^' FITL III

ecology and environment, inc.International Specialists in the Environmental Sciences " ' *

363100

(Red)

Delaware City PVC SiteTDD No. F3-8111-04

EPA No. DE-07

TABLE OF CONTENTS

1. Introduction

1.1 Site Location1.2 Site/Facility History1.3 Climatology1.4 Site Topography and Drainage

2. Hydrogeologic Setting

2.1 Geologic Formations2.1.1 Columbia Formation2.1.2 Potomac Formation

2.2 Groundwater Movement

Potential Contaminant Migration

3.1 Identified Contaminants/Pollutants3.2 Contamination Paths

4. Suggestion for Further Studies

4.1 Soil Sampling4.2 Groundwater Sampling

ARI00636

r \

Delaware City PVC SiteTDD No. F3-8111-04

EPA No. DE-07

1. Introduction

1.1 Site Location

The Delaware City PVC Site is located about 2 miles northwest of DelawareCity at latitude 39s 35' 16" N and longitude 75° 38' 50" W in New CastleCounty, Delaware. The site is situated on State Route 13 just west of theGetty Refining and Marketing Company between Red Lion Creek to the north and

Dragon Creek to the south. The area of the study site is approximately 260

acres .

1.2 Site/Facility History

The Stauffer Chemical Company manufactured polyvinyl chloride (PVC),

polyvinyl acetate and other polymers. According to the estimates on theEckhardt List, about 2,300 tons of hazardous wastes have been stored or

disposed of on the site during the period of 1966 to 1979. In May of 1981,

Stauffer Chemical Company sold the PVC plant and a part of the property to

Formosa Plastics Corporation, USA. But Stauffer Chemical still owns the rest

of the property and manufactures carbon disulfide and sodium hydrosulfide.

Comparing the airphotos of the site from 1966, 1979 and 1980, (Ref. 9) the

Stauffer Chemical Company expanded its facilities westward and southward intowhat had previously been agricultural land. Processing areas (disturbed Areas

A, C and D in Figure 10) have been expanded and a number of storage/processingtanks have also been added since 1966.

Several major changes occurred between 1979 and 1980. The two sludge pits

on the west side have been filled and graded (D̂ ). Another sludge pit southof the aeration lagoons has almost entirely dried up. It appears that the

ARI00637

(Red)Delaware City PVC SiteTDD No. F3-8111-04EPA No. DE-07IntroductionPage Two

residue is being removed, as indicated by the presence of a large crane withinthe pit. The stormwater reservoir is filled with discolored liquid whichdrains into a ditch running southwesterly off site and into the tributary ofDragon Creek (refer to Site Topography and Drainage).

The impoundments at the plant are summarized in Table 1.

1.3 Climatology•>!

The climate in this area is characteristic of a humid, continental typewith four we 11 defined seasons. The average annual temperature is

approximately 55°F. Mean daily temperatures range from 25°F to 35°F in the

winter and from 70°F to 85°F during the summer. The mean relative humidity

averages about 75% each year. The generally prevailing wind direction is from

northwest, except June when southerly winds prevai1. Average wind speeds are

about 10 miles per hour during the period January through April. From July

through October, winds are somewhat lighter, averaging from 7 to 9 miles per

hour. Maximum winds of greater than 75 mph have occurred during the rare

severe storms such as hurricanes.

The average annual precipitation is approximately 45 inches. Average

snowfall is about 20 inches per year. Late summer and fall storms of tropicorigin often produce a significant portion of the total precipitation.Precipitation in the summer season is less dependable and more variable than inthe winter. Daily precipitation of 0.01 inch or more occurs approximately 127days per year. Evapotranspiration averages 27 inches per year in this area.

The streamflow of the small creeks is dependent mainly on the surface overlandrunoff.

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(Red)Delaware City PVC SiteTDD No. F3-8111-04EPA No. DE-07IntroductionPage Three

1.4 Site Topography and Drainage

The topography of the study area is characterized by flat lowland; severallagoons and impoundments, serving a variety of different functions, are locatedat the site (see Table 1). The altitudes in the site average about 50 feetabove mean sea level with a range from 10 to 70 feet, MSL. The stormwater pond(called RV pond), located in the southwest corner of the site since 1975,receives all surface runoff from the PVC Plant and parking lots via an unlined

earthen ditch. This overland runoff flows south about a half mile in an

unnamed tributary of Dragon Creek. The tributary receives the runoff primarily

from Stauffer and areas to the south of the site. A small quantity of Stauffer

Plant Site's runoff flows north into Red Lion Creek.

The drainage area of Dragon Creek above the confluence with the unnamed

tributary is approximately 6 square miles. The principal uses of Dragon Creek

are for industrial water supply, recreation, fish, aquatic life, non-tidal

agriculture and drainage. Some marshy areas are found along the creek. A

water intake for Getty Oil Company is located on Dragon Creek at the Route 9

Bridge; this water is combined with Getty's groundwater supply which is treatedand used for industrial, sanitary and drinking purposes.

ARI00639

iDelaware 6 PVC SiteTDD No. F3-8111-04

EPA No. DE-07Page Four

CDCDcn

Impoundment

East & westaerated lagoons

RV pond(stortnwaterpond); builtin 1975

Off-grade batchpit (earthlagoon) builtin 1970

Sludge PitBuilt in 1970

North & SouthInact ive SludgePits, Built in1971, Filled in1974

Description

Reinforcedconcretebottom & sides

Clay lined(no construc-tion detailsavailable)walls sprayed

TABLE 1 - SITE IMPOUNDMENTS (FRO

Dimension and Capacity

140' x 140' x 15'140' x 140' x 15'

140' x 160* x 71below ground surface

with bituminouscoating

Clay lined(constructionplan did notmention) wallssprayed withbituminouscoating(although con-struction didnot reveal thi

Clay linedwalls sprayed

210' x 160' x 5'below ground surface

s)

_70' x 160' x 5'below ground surface

with bituminouscoating (althojghconstructionplan did notreveal this)

Unlined 180' x 60' depths160' x 110* unknown

1.25 MG1.25 MG

1.17 MG

1.25 MG

0.42 MG

M REFERENCE 1)

Functions

o Part of wastewatertreatment system

o Collects stormwaterfrom plant area

o Chemical & oil spillsaround the plant

o Occasionally processwastewater

o Pump the contentsfrom the pond intotreatment plant

o Pond overflows whenin heavy rain

o To store off-gradebatches of PVC

o Occasionally processwastewater

o Partially filled withsolids

o To store off-gradebatches of PVC

o Occasionally processwastewater

o Partially filled withliquids

o Filled with PVCsludge

Owner

Formosa PlasticCorporation ,since May 1981

Formosa PlasticCorporation ,since May 1981

Formosa PlasticsCorporation,since May 1981

Formosa PlasticsCorporation,since May 1981

Stauffer ChemicalCompany O

71

Gi-\iC '"(Red;

Delaware City PVC SiteTDD No. F3-8111-04

EPA No. DE-07Page Five

2. Hydrogeolpgic Setting

2.1 Geologic Formations

The subject site is located within the Atlantic Coastal Plain GeologicProvince. Figure 1 shows the locations of the geologic cross-sections whichwere prepared to depict the existing subsurface conditions at the site.Figures 2 and 3 contain the two geologic profiles which were developed fromavailable well log data. In the cross-sections, three aquifers can bedistinguished as follows: the Columbia Formation, the Upper Hydrologic Zoneand the Lower Hydrologic Zone of the Potomac Formation.

2.1.1 Columbia Formation

The Columbia Formation of Pleistocene age is principally of non-marineorigin, and consists of sand with subordinate amounts of gravel, clay and siltdeposited on an erosional unconformity (Ref. 2, pp, 29). The thickness of thisformation is about 60 feet in the vicinity of well DC 51-3 which is located onslopes to the southeast toward Dragon Creek (see Figure 3).

Very few pumping tests of this formation have been made in the study site.

But the transmissivity and the storage coefficient of Columbia deposits weredetermined from aquifer tests in Delaware (Ref. 4, pp. 14-15) and suiranarized asfollows:

SaturatedThickness Transmissivity Storage

Lithology (ft) (gpd/ft) Coefficient

Coarse sand with gravel lenses 86 165,000 0.05Coarse sand 79 - 130 110,000 - 120,000 0.01 - 0.07Coarse to medium sand 42 33,000 0.05Fine to coarse sand and gravel 110 104,000 0.02Fine to coarse sand 42 - 120 23,000 - 55,000 0.01

The subsurface of Delaware City PVC Site could be classified as fine tocoarse sand based on available well logs. It is then estimated that theaverage transmissivity is about 30,000 gpd/ft with a storage coefficient of0.01.

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(Red)

Delaware City PVC SiteTDD No. F3-8111-04EPA No. DE-07Hydrogeologic SettingPage Six

The Columbia Formation acts as a shallow unconfined aquifer, rechargedlocally by infiltration of precipitation. This formation is separated from theunderlying Potomac Formation by a thick layer of less permeable sandy clay,suspected to be the Merchantville and/or Magothy Formation. The clay layer isabsent locally, and hydrologic connections between the Columbia and theunderlying Potomac Formations are apparent in most of the area. The Columbiaprovides the source of water for the deeper aquifers via infiltration where theclay layer wedges out or is discontinuous.

2.1.2 Potomac Formation

The Potomac Formation in New Castle County consists of variegated siltsand clays containing interbedded sands and some gravel (Ref. 2, pp. 13). ThePotomac Formation is subdivided into two aquifer zones which are separated bya clay layer approximately 50 feet thick (see Figures 2 and 3). The UpperHydrologic Zone has a thickness of approximately 270 feet in the area of theproject site. The groundwater flow system in this zone moves mainly in asoutheasterly direction. An isopleth map of transmissivity of the PotomacUpper Hydrologic Zone is presented on Figure 4. From interpretation of theabove data, a transmissivity of about 10,000 gpd/ft. is indicated for the studyarea, with the coefficient of storage estimated to be about 0.00025 (Ref. 3,Plate 3).

The low permeability clay layer above the Lower Hydrologic Zone inhibitsthe contamination of this zone by the shallower aquifers. Since this zone isisolated from these aquifers, it does not play a significant hydrogeologic rolewithin the context of this study.

2.2 Groundwater Movement

In general, the native groundwater flows southeasterly both in the shallowand deeper aquifers. However, due to the hydraulic sensitivity of the ground-

water regime in the Atlantic Coastal Plain, pumping can have a dramatic effectupon the groundwater levels and flow directions.

Delaware City PVC SiteTDD No. F3-8111-04EPA No. DE-07Hydrogeologic SettingPage Seven

Three private wells, one of which recently ran dry, are located in thesouthwest part of the Delaware City PVC Site. These are at a depth of about 60feet in the Columbia Formation and have a pumping rate of 40 gpm. Four ofGetty's production wells are operated at the present time in the Potomac UpperHydrologic Zone as follows (Ref. 10):

Production WellsScreened in Upper Pumping Rate Distance to StaufferHydrologic Zone in gpm Chemical Site (mile)

DC 52-24 508 0.85OR6A 351 1.33EC 22-3 324 1.99DC 51-4 400 1.12

Figures 5 and 6 show the composite contours of the groundwater table inthe study region recorded for 1954-1956 and October 1981. The water levelcontours indicate that although the general trend of groundwater is still in asoutheasterly direction, pumping of the groundwater, especially from theColumbia and Upper Potomac aquifers, has: affected the direction of flow,significantly depressed the water level by several tens of feet, and createddeep localized cones of depression around the wells. A general decline in thelevels of the potentiometric surface have also been observed. For example, anaverage decline of 5 feet per year has been recorded in Well Ebl5-4, as shownon Figure 8.

The historical development of the well systems in the area of the site hashad three effects:

1) The lowered water table may not discharge continously to the receivingstream, Dragon Creek.

2) The hydraulic gradient is forced toward the production wells.

3) The depth to the shallow water table (Columbia Formation) within theconfines of the site has increased 5 to 10 feet.

The average velocity of groundwater flow in the Delaware City PVC Site isestimated to be 0.28 to 1.6 ft/day. Using 1.6 ft/day as the rate ofgroundwater movement, it would take about 7 years to travel 4,000 ft from theDelaware City PVC Site to the private wells in the Columbia Formation, Thenative hydraulic gradient in the study region is about 0.001. It changes to0.03 or more after pumping.

f l R I 0 0 6 i 4 3

(Red)Delaware City PVC SiteTDD No. F3-8111-04

EPA No. DE-07Page Eight

3. Potential Contaminant Migration

3.1 Identified Contaminants/Pollutants

Water samples at Delaware City PVC Site were analyzed by EPA on February and July1980. Priority pollutants found are listed in the following table:

TABLE 2 - SUMMARY OF PRIORITY POLLUTANTS FOUND ON DELAWARE CITY PVC SITE

Chemicals

AcenaphthleneAcroleinAcrylonitrileAnthraceneBenzeneBis (2-ethylhexyl) phthalateChloroethane

ChloroformDi-n-Butyl phthalateDichlorobromoe thaneDi ch lor odif luorome thane1 ,2-Dichloroethane

1 ,1-Dichloroethylene1 ,2-Trans-Dichloroethylene1 ,2-DichloropropaneEthylbenzeneMethylene chlorideMethyl chloridePhenanthrene1 ,1 ,1-Tri chloroethane1 ,1 ,2-TrichloroethaneTrichloroethyleneTolueneVinyl chloride

PhysicalState

CrystalLiquidLiquidCrystalLiquidLiquidLiquidor gasLiquidLiquidLiquidGasLiquid

LiquidLiquidLiquidLiquidLiquidGasCrystalLiquidLiquidLiquidLiquidLiquidor gas

Density

1.190.840.801.240.880.99

0.921.491.051.971.331.26

1.211.271.160.871.330.921.181.351.441.460.87

0.92

Solubilityin Watermg/13.42

400,00073,5000.073

1,780-1,8000.4

5,7409,600

13N/A280

8,300

5,0006,3002,700206

16,7006,450-7,250

1.29950

4,5001,100535

1.1

HumanHealth

Exp. neoplasm

CarcinogenExp. care .Care.

Volat-ilation

a

Care. exp. neo.Exp. teratogen

-Care. exp.mutagen & terExp. care.

Exp. care .

Exp. care .

Care.Care.

Care.

Volatile

aVolatile

Volatile

[Legend: exp. - experienced, care. - carcinogenic, neo. - neoplasma, andtera. - teratogen]

Six of the above priority pollutants have been identified as having a significantpresence in the water samples. The results have been presented in Table 3 along withrelevant parameters.

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">5l aware City PVCZGlteHD No. F3-eill-04-PA RJ. IE-07 O^otential ContaatiWit MigrationPage Nine CT>

i O1

TABLE 3 - SUMMARY OF WATER SAMPLING ANALYZED RESULTS

Acrolein

1 ,2-Dichloroethane

Giloroethane

Trichloroethylene

Vinyl chloride

ChlorofonB

Max. Value* fin:Protection of PrestWater Aquatic Life(ppb) *

210

20,000

_

45,000

_

28,900

Max. Value* for Protectionof Potable Hater Supply<PPW <10'* Cancer

Risk

_

0.94

_

2.7

2.0

0.19

Ibxicity

320

18,400

_

_

_

-

PhysicalState

Liquid

LiquidLiquidor gaaHeavyliquidLiquidor gasHeavyliquid

SpecificGravity

0.841

1.257

0.9214

1.456

0.9195

1.498

Solubilityin Hater<*j/*)

&

400,000

8,300

5,740

- 1,1001.1

9,600

Henry' aLaw ConstantAtnos M*Hole-'

a

N/A(0.040)

1.10 X 10

N/A(0.365)

11.7 x 10(50)

Very high(0.13)

3.39 x 10

VaporPresnur*6r-O

A

220

61

1,000

57.9

2,660

150

Analytical Results of Delaware City PVC Site (ppb)February 21, 1980

Well «

1,637

23

<10

-.4*

Well X

178

135

18

<W

<10

Well #H

116

10,916

44

16

1.002

<10

ReceivingStream

634

<10

<10

Leach FronTreatment

28

29,209

<llr

143

1,400

<10

Well *1

B

20

Well *

>700

10

1

10

July 3,

Well #9

4

0,3

I960

Hell fll

>3,000

60

6

200

EarthLagoc;

>2,OfV

r9v

2r

* Abstracted Prom Federal Register, Vol. 45, No. 231, Novaber 28, 1980.d Proa EPA-600/8-60-042A Treatability Manual: Vol. 1 Treatability CSta.

( ) Dimensionle- lues Prom Table 2.1 F of "Cbarodynffmcs, by Louis J. Thibodeaux, Jolw Wiley r V p.65.

Delaware City PVC SiteTDD No. F3-8111-04EPA No. DE-07Potential Contaminant MigrationPage Ten

1,2-dichloroethane (ethylene dichloride) is slightly soluble in water andwill be carried further by water movement. Due to the high solubility and lowspecific gravity of acrolein, it can float and mix with water. This explainsin part why high acrolein concentrations were found in the area groundwater.

Trichloroethylene and chloroform are heavier than water and only sparinglysoluble in water in terms of physical chemistry, its solubility is high interms of water quality criteria. Thus, if these contaminants were on theground and allowed to contact water, both compounds would tend to sink to thebottom of the water phase.

Chloroethane is a colorless liquid or gas and volatization is probably itsprimary transport mechanism.

Data from Stauffers indicate the presence of 500 ppm vinyl chloridemonomer (VCM) in polyvinyl chloride (PVC) sludge; this may be derived from VCMtrapped in PVC sludges and resins and subsequently released.

3.2 Contamination Paths

In the unsaturated zone, movement of these chemicals is primarilydependent on their water solubility and water/organic intermixing or interfaceunless movement occurs as a separate phase. Once these chemicals enter thegroundwater the trend of contaminant movement does not only.depend on thegroundwater flow rate, but also the viscosity of the liquids and the effectiveporosity around the groundwater flow path of the saturated zone. The lowdensity percolates will tend to float on the water table and high densitypercolates will tend to sink to the bottom of the aquifer.

Once the chemicals have discharged either through an accidental leak orinfiltration from the disposal and storage areas into the aquifer, they willremain. The concentration and location will vary with time. It is importantthat these dynamic phenomena be considered when sampling program is establishedto identify the contamination paths. The contamination paths are dependent

Delaware City PVC SiteTDD No. F3-8111-04EPA No. DE-07Potential Contaminant MigrationPage Eleven

upon various transport mechanisms.

Once chemicals enter the ground they will tend to move downward under theforce of gravity, while spreading laterally to some degree. During downwardmovement several events will take place before eventually reaching the watert ab 1 e.

o Separation of the organic liquid from the gaseous phase.o Adsorption onto the soil (particularly ^he fine grained clay and silt

soil fractures).

The rate of movement in soil depends on the soil permeability, theinfiltration rate and the solubility of the chemicals. The potential forbiodegradation/bioaccumulation of the identified chemicals within the soil isnot expected as noted below:

ChemicalsAcroleinChloroethaneChloroform1 ,2-DichloroethaneTrichloroethyleneVinyl chloride

Biodegradat ionnot importantnot expectedmay be possiblemay be possiblepossible metabolizationnot important

Bioaccumulat ionreadilynot expectedsomenot expectedexistsnot important

The groundwater contamination can be anticipated in the Columbia Formationand Upper Potomac Hydrologic Zone due to their transmissivities and the extentof pumpage in these aquifer(s). The actual transport phenomena of concentratedchemical streams and chemicals in solution in the groundwater is complicated.The transport will have taken a sufficiently long time to reach the nearby wellsoutside the confines of the site. However, based on available information, thepollutants should be at or in close proximity to the production wells underconsideration.

Additionally, there is a potential to contaminate the surface water andstream sediments because of overland flow and spillage/leakage of the disposal

impoundments from the site.

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Delaware City PVC SiteTDD No. F3-8111-04

EPA No. DE-07Page Twelve

4. Suggestion for Further Studies

4.1 Soil Sampling

On-site aoil samples from Stauffer are available which confirm thepresence of potentially hazardous chemicals. Therefore, an investigationprogram should be developed to identify the potential extent of subsurfacecontamination, and should include the following provisions:

o About 10 additional soil bore holes should be drilled in the off-sitecontaminated area, i.e. west and northwest of the filled sludge pits.

o The depth of the holes should be down to the groundwater table. Soilsamples of each hole should be obtained at 0, 2.5, 5, 7.5 and 10 feetbelow the ground surface, and at every 5 foot interval thereafter.

o The samples' integrity should be assured to prevent the loss of anyvolatile compounds.

4.2 Groundwater Sampling

Pathways for potential contamination of the groundwater are particularly

important to identify. A periodic sampling program of the off-site private andproduction wells, and of the on-site monitoring wells is recommended asfollows:

o The repeat period of sampling should be at approximately 2 monthintervals.

o The production wells should include Getty's DC 51-4, DC 52-24 andEC 12-20.

o The private wells should include EC 11-1, EC 11-5 and Tennyson's Well.

o The on-site monitoring wells should include #3, #5, #8, #9, #10, #11,#12 and #13.

o Due to budget constraints, analysis may be limited to vinyl chlorideand 1,2-dichloroethane.

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Delaware City PVC SiteTDD No. F3-8111-04EPA No. DE-07Page Thirteen

Accordingly, the additional hydrogeological investigations should be followed

up as the new data becomes available.

A Field Site Inspection, TDD No. F3-8201-32, and an Off-Site Well Sampling

Program, TDD No. F3-8204-05, are presently underway for the Delaware City PVC

Site. The analyzed results will provide a generalized approach for the

preliminary selection of remedial actions for this site.

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Delaware City PVC SiteTDD No. F3-8111-04

EPA No. DE-07Page Fourteen

REFERENCES

1. EPA Region III, Case Development & Law, Section IV to VIII (Third Draft),Stauffer Chemical Company, Delaware City, Delaware, May 12, 1980.

2. University of Delaware, Water Resources Center, The Availability ofGroundwater in New Castle County, Delaware, July 1971.

3. R.E. Wright Associates, Inc., Hydrogeologic Analysis of the Tybouts CornerLandfill, Northern New Castle County, Delaware, September 1981.

4. Delaware Geological Survey Bulletin No. 14, Hydrology of the Columbia(Pleistocene) Deposits of Delaware: An Appraisal of a Regional Water-Table Aquifer, June 1973.

5. State of Delaware, Regulations Governing the Control of Air Pollution,February 1, 1981.

6. Federal Register, Vol. 45, No. 231, Nov. 28, 1980.

7. EPA Treatability Manual: Vol. 1. Treatability Data.

8. Chemodynamics, by Louis J. Thibodeaux, John Wiley & Sons.

9. Site Analysis of Stauffer Chemical Company Site (Aerial PhotographInterpretation), The Environmental Monitoring Systems Laboratory, EPA,February 26, 1981.

10. United States Geological Survey, Water Resources Division, Dover,Delaware, unpublished data on Getty Well Field.

ARI00650

\ ",

LOCATION MAP OF THE WELLSIN THE STUDY AREA

TDD NO. F3-8111-04 (DE-7)(CM

^ "Vale 1%-=.̂ ,OQO' ftr,v̂ A-j , -̂ :>f -/- —• — •_.y~x *- "~" j*:-v

DoU. RUM

*|00

11 Q ENDSCUt:.

OR f I .If

FIGURE 2HYDROGEOLOGIC PROFILEOF CROSS-SECTION A-A1

TDD NO. F3-81H-04 (DE-7)

-4100

UQENDJ

cut •

SMO

OR !llf

FIGURE 3

HYDROGEOLOGIC PROFILEOF CROSS-SECTION B-B1

TDD NO. F3-8111-04 (DE-7)

-600

-->'.

FIGURE 4

ISOPLETHS OF TRANSHISSIVITYOF POTOMAC UPPER HYDROLOGIC

" 5 ZONE IN THE SURROUNDING OFDELAWARE CITY PVC SITE

Vx'ttx Saint Georges

in.-. 2,oo

-N,0 12

GROUNDWATER TABLE .TO 1956 !

—__ • (Red)

:KL\y

CONTOUR MAP OFOBSERVED ON OCTOBER 1981

.S\\ 'iint Goores

ury

RUNtloo

f w W I T H U.'•V^XNO "-LtNHt-

DEPRESSION OF GROUNDWATER TABLE DUE THEPUMPAGE IN THE-NEARBY.GETTY PRODUCTION HELlS

TDD NO. F3-8111-04 (DE-7)

•r

M

5-75

i -loj

(ftt-ci)

--FIGURE 8 A R I 0 0 6 5 8 '

-Water levels in Ebl5-A. 1955-19ZO.("unpubl ished data from USGS, Delaware )

O R I G I N A L(Red)

FIGURE 9

SKETCH -OF--MIGRAT-ION -PATHS OF- -CONTAMINANTS IN STAUFER SITE

W1HD

A R I O O 6 5 9SPJPNtLDlEfLf__-.

PLEASE REFER TO THE ADMINISTRATIVE RECORD FILEFOR THE MAP THAT CORRESPONDS WITH THIS PAGE