HRS DOCUMENTATION RECORD--REVIEW COVER SHEET

Name of Site: Mansfield Trail Dump

Date Prepared: October 2010

Contact Persons

Site Investigations: James Desir (212) 637-4342 U.S. Environmental Protection Agency New York, NY

Documentation Record: Ildefonso Acosta (212) 637-4344 U.S. Environmental Protection Agency New York, NY

Scott T. Snyder, CHMM (732) 417-5812 Weston Solutions, Inc. Edison, NJ

Pathways, Components, or Threats Not Scored

Surface Water: Although not currently scored, the Surface Water Migration Pathway is of potential concern due to the site’s proximity to downslope surface water [Ref. 13, p. 2; Ref. 16, p. 1]. An unnamed tributary of Lubbers Run is located downslope of the site and flows north along the abandoned railroad bed that runs adjacent to the site to the east [Ref. 4, p. 1; 13, p. 2; 16, p. 1; 25, p. 1]. The 15- Mile Target Distance Limit (TDL) includes Lubbers Run and the Musconetcong River [Ref. 16, p. 1]. Both Lubbers Run and Musconetcong River are used for recreation, including fishing, boating, and hiking [Ref. 42, p. 2; 43, p. 4; 44, p. 1]. Information obtained from the NJ Division of Fish and Wildlife indicates that portions of the Musconetcong River are fished for human consumption [Ref. 44, p. 1]. Segments of the Musconetcong River downstream of the site are federally- designated as a Wild and Scenic River [Ref. 42, p. 1; 43, p. 5].

Soil Exposure: Although not currently scored, the Soil Expos ure Pathway is of potential concern due to the site’s proximity to residential properties and public areas. Dump Area A lies directly upslope of residential properties along Brookwood Road; therefore, the potential exists for migrati on of contamination from the site to these downslope residential properties [Figure 3; Ref. 4, p. 1; 6, p. 5]. Three of these residential properties lie within 200 feet of Dump Area A [Figure 3]. In addition, a public pedestrian/bike path is located downslope of Dump Area D [Figure 2; Ref. 6, p. 9]. EPA observed that waste material was deposited immediately adjacent to the pedestrian/bike path [Ref. 6, pp. 9, 48]. Trespassers have been observed in the vicinity of Du mp Area B [Ref. 6, p. 60].

Air: The Air Migration Pathway is not scored because it does not contribute significantly to the site score.This page has been intentionally left blank.HRS DOCUMENTATION RECORD

Name of Site: Mansfield Trail Dump* Date Prepared: October 2010

CERCLIS ID No.: NJN000206345

EPA Region: 2

Street Address of Site:** Intersection of Brookwood and Ross Roads, Byram Township, NJ 07874

County and State: Sussex County, New Jersey

General Location in the State: Northwestern New Jersey

Topographic Map: Stanhope, NJ

Latitude:** 40° 55' 44.20" (40.9289443) North Longitude:** 74° 41' 58.56" (-74.6995999) West

Site Reference Point: Sample location BYR-SLD148

[Figures 1, 2; Ref. 3, p. 1; 4, p. 1; 5, p. 2]

* The site was formerly listed in the Comprehensive Environmental Response, Compensation, and Liability Information System (CERCLIS) as Byram Township TCE Regional Ground Water Contamination [Ref. 3, pp. 1-2]. References prepared prior to the change reflect the previous site name.

** The street address, coordinates, and contaminant lo cations presented in this Hazard Ranking System (HRS) documentation record identify the general area where the site is located. They represent one or more locations EPA considers to be part of the site based on the screening info rmation EPA used to evaluate the site for NPL listing. EPA lists national priorities among the known "releases or threatened releases" of hazardous substances; thus, the focus is on the release, not precisely delineated boundaries. A site is defined as where a hazardous substance has been "deposited, stored, placed, or otherwise come to be located." Generally , HRS scoring and the subsequent listing of a release merely represent the initial determination that a certain area may need to be addressed under CERCLA. Accordingly, EPA contemplates that the preliminary description of facility boundaries at the time of scoring will be refined as more information is developed as to where the contamination has come to be located.

Scores

Ground Water Pathway 100.00 Surface Water Pathway Not Scored Soil Exposure Pathway Not Scored Air Pathway Not Scored

HRS SITE SCORE 50.00

1WORKSHEET FOR COMPUTING HRS SITE SCORE

MANSFIELD TRAIL DUMP

S S 2

1. Ground Water Migration Pathway Score (S gw ) 100.00 10,000 (from Table 3-1, line 13)

2a. Surface Water Overland/Flood Migration Component Not Scored (from Table 4-1, line 30)

2b. Ground Water to Surface Water Migration Component Not Scored (from Table 4-25, line 28)

2c. Surface Water Migration Pathway Score (S

sw ) Not Scored Enter the larger of lines 2a and 2b as the pathway score.

3. Soil Exposure Pathway Score (S

s ) Not Scored (from Table 5-1, line 22)

4. Air Migration Pathway Score (S

a ) Not Scored (from Table 6-1, line 12)

5. Total of S gw 2 + S

sw 2 + S

s 2 + S

a 2 10,000

6. HRS Site Score Divide the value on line 5 by 4 and take the square root 50.00

2GROUND WATER MIGRATION PATHWAY SCORESHEET

MANSFIELD TRAIL DUMP

GROUND WATER MIGRATION PATHWAY Factor Categories & Factors MAXIMUM

VALUE VALUE

ASSIGNED

Likelihood of Release

1. Observed Release 550 550

2. Potential to Release

2a. Containment 10 not scored 2b. Net Precipitation 10 not scored 2c. Depth to Aquifer 5 not scored

2d. Travel Time 35 not scored

2e. Potential to Release [lines 2a (2b+2c+2d)] 500 not scored

3. Likelihood of Release (higher of lines 1 and 2e) 550 550

Waste Characteristics

4. Toxicity/Mobility * 10,000 5. Hazardous Waste Quantity * 100

6. Waste Characteristics 100 32

Targets

7. Nearest Well 50 50 8. Population

8a. Level I Concentrations ** 560

8b. Level II Concentrations ** not scored

8c. Potential Contamination ** not scored 8d. Population (lines 8a+8b+8c) ** 560

9. Resources 5 not scored

10. Wellhead Protection Area 20 not scored 11. Targets (lines 7+8d+9+10) ** 610 12. Aquifer Score (lines 3x6x11 divided by 82,500) 100 100

13. Ground Water Migration Pathway Score (S gw ) 100 100

* Maximum value applies to waste characteristics category. ** Maximum value not applicable.

3REFERENCES

Reference

Number Description of the Reference

1. U.S. Environmental Protection Agency (EPA). Hazard Ranking System, Final Rule . Federal Register, Volume 55, No. 241, pp. 51532-51667. December 14, 1990. [138 pp.]

2. EPA. Superfund Chemical Data Matrix, SCDM Data Versions: 1/27/2004, Appendices B-I (Hazardous Substances Factor Values) and B-II (Hazardous S ubstances Benchmark (excerpts); and 10/30/2006, Trichloroethylene (TCE) updates . January 2004 and October 2006, respectively. A complete copy of SCDM is available at http://www.epa.gov/superfund/site s/npl/hrsres/tools/scdm.htm on March 30, 2009. [6 pp.]

3. EPA. Superfund Information Systems, CERCLIS Database , Mansfield Trail Dump: Site Information and

Aliases . Downloaded from http://cfpub.epa.gov/supercpad/cursites/csitinfo.cfm?id=0206345 and http://cfpub.epa.gov/supercpad/cursites/calinfo.cfm?id=0206345 on July 26, 2010. [2 pp.]

4. U.S. Department of the Interior Geological Survey (USGS). Stanhope Quadrangle, New Jersey 7.5- Minute Series (Topographic) . 1995. [1 map]

5. Lisichenko, Peter, WESTON. E-mail correspondence with Scott Snyder, Subject: BYRAM – BYRSLD148; with attached reference . June 28, 2010 [2 pp]

6. WESTON Region 5 Superfund Technical Assessment and Response Team (START). Site Logbook No. 860-4E-AFGY, Byram Township TCE Regi onal Ground Water Contamination, NJN000206345 ; with attached photo documentation . December 2009 to May, 2010. [99 pp.]

7. Snyder, Scott, WESTON. Sampling Trip Repor t, Byram Township TCE Regional Ground Water

Contamination . March 10, 2010. [36 pp.]

8. Desir, James, EPA. Letter to Scott Snyder, WESTON, Subject: Organic Data Package Validation Completion (case#39529)- Byram Twp TCE Regional Ground Water Contamination; with attached Contract Laboratory Program organic data pack ages, e-mail correspondence, and summary tables . March 30, 2010. [206 pp]

9. Glasser, Kenneth, NJDEP. NJDEP Mobile Environmen tal Laboratory, Final Report, Byram Twp Regional GW Contamination, Soils, Byram Twp, Sussex County, NJ. October 1, 2009. [22 pp.]

10. Snyder, Scott, WESTON. Project Note to Byram TCE file, Subject: Number of residents served by private wells; with attached references . March 9, 2010. [24 pp.]

11. Stanford, Scott D, et al., NJDEP Division of Scie nce and Research, New Jersey Geological Survey. Surficial Geology of the Stanhope Quadrangle, Sussex and Morris Counties, New Jersey, Open File Map 22, Sheet 1 of 2 . 1996. [1 map]

12. Volkert, Richard A, et al., Department of the Interior, U.S. Geological Survey (USGS). Bedrock Geologic Map of the Stanhope Quadrangle, Sussex and Morris Counties, New Jersey, GQ-1674 . 1989. [1 map]

13. Sorce, Frank, NJDEP. E-mail correspondence with Scott Snyder, WESTON, Subject: Re: Byram TCE Surface Water Date; with attached references . April 13, 2010. [43 pp.]

14. Desir, James, EPA. E-mail correspondence with Scott Snyder, WESTON, Subject: Fw: Byram (1) (forwarding e-mail correspondence from Nick Magriples, EPA and Frank Sorce, NJDEP); with attached

references . November 18, 2009. [8 pp.]

4REFERENCES (continued)

15. Yahoo! Yellow Pages. Yahoo! Yellow Pages – Byram Dry Cleaners . Downloaded from http://yp.yahoo.com/py/ypMap.py?tuid=21887993&ycat=8109642&addr=17+Us-206&cit on March 17, 2010. [1 p.]

16. WESTON. 4-Mile Radius Map, Byram Township TCE Regional Ground Water Contamination, Byram Township, Sussex County, NJ . June 28, 2010. [1 map]

17. Environmental Data Resources (EDR). Th e EDR Radius MapTM Report with GeoCheck ® , Byram TCE, County Rd. 605, Stanhope, NJ 07874, Inquiry Number: 2719199.2s . March 12, 2010. [87 pp.]

18. EDR. The EDR Historical Topographic Map Repor t, Byram TCE, County Rd. 605, Stanhope, NJ 07874, Inquiry Number: 2719199.4 . March 12, 2010. [9 pp.]

19. EDR. Certified Sanborn ® Map Report, Byram TCE, County Rd. 605, Stanhope, NJ 07874, Inquiry

Number: 2719199.3 . March 12, 2010. [2 pp.]

20. Agency for Toxic Substances & Disease Registry (ATSDR). ToxFAQsTM for Trichloroethylene (TCE)

. Downloaded from http://www.atsdr.cdc.gov/tfacts19.html on March 17, 2010. [3 pp.]

21. Ohio Department of Health, Bureau of Envir onmental Health (in cooperation with ATSDR). Trichloroethylene, Answers to Frequently Asked Questions . October 2006. [2 pp.]

22. Yahoo! Yellow Pages. Yahoo! Yellow Pages – Wa gner Industries; with attached reference . Downloaded

from http://yp.yahoo.com/py/ypMap/py?tuid=21887944&ycat=95764652&addr=17+Us-206&ci on March 17, 2010. [7 pp.]

23. American Society for Testing and Materials (ASTM). Standard D4547-98: Standard Guide for Sampling Waste and Soils for Volatile Organic Compounds . November 1998. [10 pp.]

24. EPA Region 2 Division of Environmental Science and Assessment (DESA), Monitoring and Assessment Branch. Standard Operating Procedures for Field Activities (excerpts) . December 2006. [12 pp.]

25. Bakeman, Greg, NJDEP. E-mail correspondence with Scott Snyder, WESTON, Subject: Re: Byram TCE

site . March 18, 2010. [2 pp.]

26. Herman, Greg, NJDEP. E-mail correspondence with Scott Snyder, WESTON, Subject: Re: Byram Towp. TCE Site; with attached references . March 18, 2010. [6 pp.]

27. Stanford, Scott, NJDEP. E-mail correspondence w ith Scott Snyder, WESTON, Subject: RE: Byram TCE

site . March 18, 2010. [2 pp.]

28. Sorce, Frank, NJDEP. E-mail correspondence with Scott Snyder, WESTON, Subject: Byram; with

attached references . March 24, 2010. [9 pp.]

29. EPA. USEPA Contract Laboratory Program, Statem ent of Work for Organic Analysis, Multi-Media, Multi-Concentration, SOM01.1 (excerpts) . May 2005. [17 pp.]

30. EPA. USEPA-540-R-08-01, National Functional Guide lines for Superfund Organic Methods Data Review, (excerpts) . June 2008. [6 pp.]

5REFERENCES (continued)

31. Snyder, Scott, WESTON. Project Note to Byra m TCE File, Subject: Well Depths; with attached

references . May 5, 2010. [26 pp.]

32. EPA. Quick Reference Fact Sheet EPA 540-F-94-028: Using Qualified Data to Document an Observed

Release and Observed Contamination . Office of Emergency and Remedial Response. November 1996. [18 pp.]

33. Heath, Ralph C, USGS. Basic Ground-Wate r Hydrology, Water-Supply Paper 2220 (excerpts) . 1998. [4 pp.]

34. U.S. Government Printing Office (GPO). Electronic Code of Federal Regulati ons (e-CFR). Title 40: Protection of Environment, Part 261-Identification a nd Listing of Hazardous Waste, Subpart A-General, §261.2 Definition of solid waste . Downloaded from http://ecfr.gpoaccess.gov on May 5, 2010. [4 pp.]

35. Snyder, Scott, WESTON. Project Note to Byram TC E File, Subject: Ground Water Flow Direction; with

attached references . May 25, 2010. [19 pp.]

36. Snyder, Scott, WESTON. Sampling Trip Report – Monitoring Well Sampling, Byram Township TCE Regional Ground Water Contamination . May 14, 2010. [12 pp.]

37. Russell, Arnone, EPA. E-mail correspondence with Jame s Desir, EPA, et al., Subject: Attached are the regionally assessed data for the Byram Twp site unde r CLP Case # 40095, SDG # B7GF8; with attached analytical data . May 25, 2010. [25 pp.]

38. EPA. Ground Water Sampling Procedure Low Stress (Low Flow) Purging and Sampling, GW Sampling

SOP Final . March 16, 1998. [9 pp.]

39. Snyder, Scott, WESTON. Sampling Trip Report – Sludge Sampling, Byram Township TCE Regional

Groundwater Contamination . April 20, 2010. [11 pp.]

40. Russell, Arnone, EPA. E-mail correspondence with Jame s Desir, EPA, et al., Subject: Attached are the regionally assessed data for the Byram Twp site under the CLP Case # 40050, SDG # B7G12; with attached analytical data . June 4, 2010. [28 pp.]

41. Snyder, Scott, WESTON. Project Note to Byram TCE File, Subject: Containment – Dump Area A Lower Trench; with attached references . [6 pp.]

42. U.S. Department of the Interior, National Park Service. Musconetcong River Wild and Scenic River Study – Home Page . Downloaded from http://www.nps.gov/nero/rivers/muskie.htm on March 29, 2010. [2 pp.]

43. Musconetcong Advisory Committee, et al. Musconetc ong River National Wild and Scenic Rivers Study, River Management Plan (excerpts) . April 2003. [7 pp.]

44. Daniels, Anthony, WESTON. Telecon Note: Conversa tion with Pat Hamilton, NJ Division of Fish and Wildlife, Subject: Fish consumption in the Musconetcong River and Lubbers Run; with attached reference

. April 22, 2010. [2 pp.]

6SITE DESCRIPTION

The Mansfield Trail Dump (MTD) (formerly Byram Town ship TCE Regional Ground Water Contamination) site (CERCLIS ID No. NJN000206345) consists of waste di sposal trenches in a wooded area and ground water contamination extending into an adjacent residential neighborhood [F igures 2, 3; Ref. 3, 6, 7, 8]. In the wooded area,

there are four discrete areas of concern th at have been designated as Dump Areas A, B, C, and D [Figure 2; Ref. 6]. The dump sites are located on wooded, undeveloped properties in Byram Township, Sussex County in northwestern New Jersey [Figures 1, 2; Ref. 6]. Dump Areas A, B, and D consist of one or more trenches in which a waste of unknown origin has been deposited [Figure 2; Ref. 6, 7]. The exact depth and the amount of sludge deposited in these areas are unknown. Dump Area C consists of a disturbed area adjacent to Dump Area B [Figure 2; Ref. 6]. Dump Area A consists of two trenches located on a ridgeline that trends southw est to northeast, directly upslope of and overlooking the Brookwood/Ross Roads neighborhood to the west [Figures 2, 3; Ref. 4, 14]. Dump Areas B, C, and D are situated on the east side of the ridge [Figure 2; Ref. 4]. A study conducte d by the New Jersey Department of Environmental Protection (NJDEP) in 2009 indicated that soils in Dump Areas A, B, and D are contaminated with volatile organic compounds (VOCs) [Ref. 9]. Trichloroet hylene (TCE) was detected in a soil sample collected from Dump Area A at a concentration of 20,342.52 parts per million (ppm) [Ref. 9].

For the MTD site, EPA is evaluating the Ground Water Migra tion Pathway [Ref. 1]. For HRS purposes, the source under consideration is the Dump Area A surface impoundment [Figure 2; Ref. 1, 6, 7, 8]. As part of sampling efforts in February, March, and April 2010, EPA collected waste samples from Dump Area A and residential well samples from 21 homes in the Brookwood and Ross Roads neighborhood [Figures 2 a nd 3; Ref. 6, 7, 39]. The waste and residential well samples were analyzed for Target Compound List (TCL) VOCs through the EPA Contract Laboratory Program (CLP) [Ref. 6, 7, 8, 39, 40]. Analytical results indicate that the waste samples from Dump Area A contain TCE [630 micrograms per kilogram (μg/kg), 15,000 μg/kg, and 170,000 μg /kg] and cis-1,2-dichloroethylene (cis-1,2-DCE) (2,000 μg/kg, 56,000 μg/kg, and 81,000 μg/kg), and that the TCE c ontamination extends to 15 residential wells serving 56 residents in the Brookwood and Ross Roads neighborhood, at Level I concentrations ranging from 1.3 to 71 micrograms per liter (μg/L) [Table 2; Figures 2, 3; Ref. 2, 6, 7, 8, 39, 40]. Various chlorinated benzene compounds, including 1,2- dichlorobenzene (850,000 μg/kg), were detect ed in Dump Area B [Ref. 6, 7, 8].

7FIGURE #: DATE: CLIENT NAME: PROJECT: LEGEND: TITLE: 

# ! ( Site Reference Point (BYR-SLD148)

0 2,000 4,000 1,000

Graphic Scale In Feet

Site Location

National Geographic TOPO! U.S. Geologic Survey (USGS). 7.5 Minute

Series (Topographic) Quadrangles: Stanhope, NJ 1995 Weston Solutions, Inc. Region 5 Superfund Technical Assessment and

Response Team. Site Logbook No. 860-4E-AFGY, TDD No. S05-0013-0911-021. April 16, 2010.

EPA Mansfield Trail Dump

July 2010 1 

### Site Location Map Mansfield Trail Dump Byram Township Sussex County, NJ 

# ®

Site Area "P:\SAT2\Byram_TCE_GW\MXD\07963_BT_Site_Loc.mxd 

### NJ PA NY



## ! (P ow e

r Li

n

e R

i gh

t-

o f

- W

a

y 

# ®

Dump Area D

Dump Area A (Lower) BYR-SLD150



### ! ( # * " ) " ) BYR-SLD148
BYR-SLD149

BYR-SLD144 BYR-S101
BYR-SS101A



### Dump Area A (Upper)

BYR-S105 

### ! ( BYR-SS105A

BYR-S100
BYR-SS100A

BYR-S104 / BYR-S107 (DUP) BYR-SLD145 / BYR-SLD147 (DUP) BYR-SS107A 

### # ! ( * ! (
Dump Area B



### # * ! ( BYR-S102
BYR-SS102A 

### Dump Area C



### ! ( BYR-S106
BYR-SS106ABike PathP:\SAT2\Byram_TCE_GW\MXD\07964_BT_Study_Area_85X11.mxd

2 0 0 100 0 2 0 0

Graphic Scale In Feet

LEGEND: TITLE:

" ) Waste Sample Location (April 2010)



### # Waste Sample Location (February - March, 2010) 

### *
! Soil Sample Location (February - March, 2010) 

### (

Dump Areas

PROJECT: Mansfield Trail Dump

CLIENT NAME:

EPA SOURCES:

1. 2007 - 2008 High Resolution Orthophotography. NJ Office of Information

Technology (NJOIT), Office of Geographic Information Systems (OGIS). October 2008. http://njgin.nj.gov/OIT_IW/index.jsp

2. Weston Solutions, Inc. Region 5 Superfund Technical Assessment and Response

Team. Site Log Book No 860-4E-AFGY, TDD No. S05-0013-0911-021. December 1, 2009, February 22-24, March 1-5, 2010, April 16, 2010, and May 4, 2010



### Soil and Waste Sample Location Map Mansfield Trail Dump Byram Township Sussex County, NJ

DATE: FIGURE #: July 2010 2

RR O S S R O A D B R O O K W O O D R O A D 

# ±BYR-DW13179 Brookwood RoadBYR-DW130BYR-DW12469 Brookwood RoadBYR-DW12975 Brookwood Road77 Brookwood RoadBYR-DW11965 Brookwood RoadBYR-DW12167 Brookwood RoadBYR-DW12773 Brookwood Road

P:\SAT2\Byram_TCE_GW\MXD\07966_BT_Res_Well_Sample.mxdBYR-DW137/BYR-DW138 (DUP)BYR-DW122BYR-DW12863 Brookwood Road71 Brookwood Road74 Brookwood RoadBYR-DW13661 Brookwood RoadBYR-DW12570 Brookwood RoadBYR-DW117BYR-DW118BYR-DW12664 Brookwood RoadBYR-DW12068 Brookwood RoadBYR-DW1328 Ross RoadBYR-DW114BYR-DW123 (DUP)4 Ross Road62 Brookwood RoadBYR-DW13560 Brookwood RoadBYR-DW1133 Ross Road66 Brookwood RoadDump Area D5 Ross RoadBYR-DW1339 Ross Road7 Ross RoadDump Area A (Lower)Dump Area A (Upper)11 Ross RoadDump Area BDump Area C300 150 0300BYR-DW139Graphic Scale In FeetByram Intermediate SchoolSOURCES:1. 2007 - 2008 High Resolution Orthophotography. NJ Office of InformationTechnology (NJOIT), Office of Geographic Information Systems (OGIS).October 2008. http://njgin.nj.gov/OIT_IW/index.jsp2. State of New Jersey Composite of Parcels Data, New Jersey State PlaneNAD83 and MOD-IV Tax List Search Database, New Jersey Office of InformationTechnology (NJOIT), Office of Geographic Information Systems (OGIS)May 2010. https://njgin.state.nj.us/NJ_NJGINExplorer/IW.jsp?DLayer=Parcels%20by%20County/Muni3. Weston Solutions, Inc. Region 5 Superfund Technical Assessment and ResponseTeam. Site Log Book No 860-4E-AFGY, TDD No. S05-0013-0911-021December 1, 2009, February 22-24, March1-5, 2010, and May 4, 2010Parcel Boundary *Dump Areas* Wells all within property boundaries.* Sample locations annotated with sample identificationnumber (ex. BYR-DW116). Residential properties withoutidentification number were proposed but not sampled.Dump Area CDump Area BDump Area ADump Area DPROJECT:TITLE:Mansfield Trail DumpRResidential Well Sample Location MapDATE:Mansfield Trail DumpMarch 2010CLIENT NAME:Byram TownshipFIGURE #:EPASussex County, NJ3FIGURE #: DATE: CLIENT NAME: PROJECT: SCALE: TITLE: 

### ! <



### ! <



### ! < 

### Dump Area A (Lower)

Dump Area A (Upper)

Dump Area C Dump Area B Dump Area D

P

ow e

r

L

i n

e

R

i gh

t

- of

- W

a

y

B i k e P a t hBike Path MW-1
BYR-GW109 MW-2
BYR-GW110

MW-3 BYR-GW111 / BYR-GW112 (DUP)

R 

# ®

200 0 200 100

Graphic Scale In Feet

Mansfield Trail Dump

EPA July 2010 4 

### Monitoring Well Location Map Mansfield Trail Dump Byram Township Sussex County, NJP:\SAT2\Byram_TCE_GW\MXD\07967_BT_MW_Loc_85X11.mxd

SOURCES: 1. Bedrock Geology for New Jersey - Faults. New Jersey Department of

Environmental Protection (NJDEP), New Jersey Geological Survey (NJGS). June 30th, 1999. http://www.nj.gov/dep/njgs/geodata/dgs04-6.htm. 2. 2007 - 2008 High Resolution Orthophotography. NJ Office of Information

Technology (NJOIT), Office of Geographic Information Systems (OGIS). October 2008. http://njgin.nj.gov/OIT_IW/index.jsp 3. Weston Solutions, Inc. Region 5 Superfund Technical Assessment and Response

Team. Site Log Book No 860-4E-AFGY, TDD No. S05-0013-0911-021 December 1, 2009 and May 4, 6, and 7, 2010 

### ! < 

### Monitoring Well Sample Location

Fault Location
Dump Areas 

## Legend:

MW-2
BYR-GW109 Monitoring Well ID Sample IDGW-General

3.0 GROUND WATER MIGRATION PATHWAY

3.0.1 General Considerations

The predominant surficial deposits underlying the MTD site consist of Netcong (glacial) Till [Ref. 11, p. 1]. Glacial till is characterized by poorly-sorted, non-stra tified sediment deposited by glacial ice or by flow of sediment from the glacier surface [Ref. 11, p. 1]. Till occurs in drumlins and mora ines, and as a discontinuous layer on the bedrock surface, thickening in some of the lower-lying valleys [Ref. 11, p. 1; 25, p. 1]. The Netcong Till consists predominantly of sand, with 10 to 40 percent by volume pebbles and cobbles, and 5 to 10 percent by volume boulders [Ref. 11, p. 1]. The underlying bedrock consists mainly of Middle Proterozic-age cr ystalline gneissic and granitic rocks [Ref. 12, p. 1; 25, p. 1; 26, p. 1].

The hydrogeology beneath the site is characterized by the glaci al overburden aquifer being hydraulically connected to the underlying gneissic bedrock aquifer [Ref. 25, p. 1]. This aquifer interconnection is demonstrated by a downward migration of hazardous substances from Dump Area A into the bedrock aquifer to nearby residential wells. Concentrations of TCE documented at levels significantly above background have been found in these residential wells which are within 2 miles of the site source. [Figures 2, 3; Tables 1, 2; Ref. 6, p. 48; 39, p. 3; 40, pp. 8, 12, 16]. Therefore, an aquifer interconnection occurs within 2 miles of sources at the site and the combined aquifer constitutes the aquifer of concern, and is used in scoring the site [Ref. 1, p. 51595]. Based on the topography and the detections of VOCs in the residential wells, it is likely that shallow ground water flow beneath Dump Area A, which lies on the west side of the ridge, is to the west-northwest toward the Brookwood and Ross Roads neighborhood [Figure 3; Ref. 25, p. 1; 26, pp. 1, 3]. Therefore, the ridge forms a local surficial ground water divide and sources to the east (i.e., Dump Areas B and D) overlie a separate surficial aquifer [Figur e 2; Ref. 4, p. 1; 25, p. 1; 26, p. 3].

Ground water flow in the bedrock is influenced by a complex system of local and regional faults, fractures, and joints; however, localized pumping of the private wells in the area affects ground water flow and contaminant transport [Ref. 25, p. 1]. The pumping of water supply wells, in this case the private wells in the Brookwood and Ross Roads neighborhood creates cones of depression that causes water in the aquifer to converge on the wells from all directions [Ref. 33, p. 4]. Site-specific information indicates that ground water flow beneath the eastern portion of the site is south to north [Figure 4; Ref. 35, p. 1]. On April 22 and 23, 2010, EPA installe d Monitoring Well MW-3 south of the existing site monitoring wells previously installed by NJDEP (MW-1 and MW-2) [Figure 4; 35, pp. 1, 3-5]. MW-3’s design is similar to the existing NJDEP monitoring wells with approximately 100 feet of open hole [Ref. 14, pp. 5-8; 35, pp. 3-5]. On May 4, 2010, all site monitoring wells were surveyed by a New Jers ey-licensed surveyor [Ref. 35, pp. 6-10]. Based on static water level depths in each of the monitoring wells and the surveyed elevations of the wells’ inner casings, ground water flow is from south to north, with MW-3 being hydraulically upgr adient of MW-1 and MW-2 [Figure 4; Ref. 35, pp. 6-9, 11-14, 19].

Due to insufficient mapping, the lateral extent of the aquifer of concern and therefore the complete extent of the TDL is currently unknown. However, since only actually contaminated we lls are used in scoring the site, it is not necessary to establish the complete extent of the aquifer within the TDL [Ref. 1, p. 51595]. Although there is insufficient information available to document the full extent of the aquifer within the TDL, EPA considers that there is still a threat of contaminant migration further than what is currently documented.

Stratum 1 (shallowest)

Stratum Name : Netcong Till

Description : The surficial deposits underlying the site consist of poorly-sorted yellowish-brown silty sand with some to many pebbles, gravel, cobbles, and boulders [Ref. 11, p. 1; 25, p. 1; 27, p. 1]. Gravel clasts are mostly gneiss with some gray mudstone and sandstone [Ref. 27, p. 1]. The till is discontinuous and ranges from 0 to 15 feet thick on the north slope of the ridge (i.e., Dump Area A) and thicker (20-30 feet) in other areas of the site [Figure 2; Ref. 4, p. 1; 11, p.1; 25, p. 1; 27, p. 1]. The hydraulic conduc tivity of coarse-grained glacial till depos its such as this is approximately 10 -4
centimeters per second (cm/s) [Ref. 1, p. 51601].

12GW-General

Stratum 2

Stratum Name : Losee Gneiss

Description : The Losee Gneiss bedrock is composed of medium-fine- to medium-coarse-grained, poorly-foliated gneiss [Ref. 12, p. 1]. The depth of the bedrock in the site area varies from less than 10 feet to approximately 30 feet below ground surface [Ref. 25, p. 1; 27, p. 1]. Ground water flow is preferential along faults, fractures, joints, and foliations and is affected by localized pumping of private and public supply wells [Ref. 25, p. 1; 33, p. 4]. The hydraulic conductivity of fractured bedrock such as this ranges from approximately 10 -4 to 10 -6 cm/s [Ref. 1, p. 51601].

133.1 LIKELIHOOD OF RELEASE

3.1.1 Observed Release

Chemical Analysis

Aquifer Being Evaluated: Crystalline Bedrock Aquifer

An observed release to ground water by chemical analysis is established by residential well samples collected by EPA in February and March 2010. EPA collected residential well samples from 21 homes in the Brookwood and Ross Roads neighborhood [Figure 3; Ref. 6, pp. 15-16, 18-20, 22, 26-27, 30, 32-35, 38-42; 7, pp. 4- 6, 14, 17, 19, 21, 23, 28]. Five of the residential well samples were collected from homes on th e west end of the neighborhood that do not use a point of entry treatment system (POET) to evaluate background conditions [Figure 3; Ref. 6, pp. 15, 22, 26, 33, 41; 7, pp. 5-6]. Based on the west-northwest direction of ground water flow in the surficial aquifer on the west side of the ridge, the background wells are considered to be sidegradient of the s ource area [Figures 2, 3; Ref. 25, p. 1; 26, p. 3]. The residential well samples were collected directly into sample jars and if in use, prior to POET systems [Ref. 6, pp.16, 18- 20, 22, 26-27, 32-35, 38-42; 7, pp. 3-5] . TCE and 1,2-DCE were detected in 15 and 14 of the residential wells, respectively at concentrations that meet the criteria for observed release [Tables 1, 2; Ref. 1, p. 51589]. Based on topography and the detection of TCE in the residential we lls, shallow ground water in the glacial overburden beneath Dump Area A flows west toward Brookwood Road [Figure 3; Table 1; Ref. 4, p. 1; 25, p. 1; 26, p. 3]. Residential well sampling results are presented in Tables 1 and 2.

Notes on EPA Sample Similarity:

• Sampling Methods: The background and release residential well samples we re all collected by EPA, according to EPA SOPs, during the same sampling event in Februa ry-March 2010 [Ref. 6, pp. 15-16, 18-21, 26, 30, 32-34, 38-40, 42; 7, p. 3; 24, p. 12].

• Analytical Procedures: The background and release resi dential wells samples were all analyzed for TCL VOCs by the same laboratory (A4 Scientific of The Woodlands, Te xas) [Ref. 6, pp. 18, 22, 27, 31, 37, 42; 7, pp. 1-2, 14-24, 28-29; 8, pp. 35, 119]. The samples were recei ved by the laboratory intact and under custody [Ref. 7, pp. 30-34, 36]. The chemical analyses were coordina ted through the EPA CLP; EPA validated the analytical results according to Region 2 Data Validation guidelines [R ef. 7, pp. 3, 14, 17, 19, 21, 23, 28; 8, pp. 35-39, 119- 127].

• Aquifer of Concern: The background and release reside ntial wells are all completed in the gneissic bedrock [Tables 1, 2; Ref. 25, p. 1].

• Open Hole Interval: The open hole elevations for the background (770 ft-440 ft MSL) and release (750 ft-482 ft MSL) wells overlap and are therefore part of the same relative portion of the aquifer [Ref. 31, p. 2].

MSL = Mean Sea Level

14Table 1Background Concentrations - VOCsResidential Well Samples - February-March 2010Mansfield Trail Dump, Byram Township, New JerseyWESTON Sample No.:Background Well ConcentrationsBYR-DW132BYR-DW133BYR-DW135BYR-DW136BYR-DW137BYR-DW138Address:8 Ross Rd.9 Ross Rd.60 BrookwoodRd.61 BrookwoodRd.63 BrookwoodRd.63 BrookwoodRd.EPA Sample No.:B7GJ1B7GJ2B7GJ4B7GJ5B7GJ6B7GJ7Date:3/4/20103/2/20102/24/20102/23/20102/22/20102/22/2010Number of Residents:34434Dup. of BYR-DW137Open Hole Interval (MSL)770-645770-640710-660690-440690-550690-550VOCs (μg/L)ResultRDLResultRDLResultRDLResultRDLResultRDLResultRDLTrichloroethylene0.5 U0.50.5 U0.50.2 J*0.50.5 U0.50.5 U0.50.5 U0.5cis-1,2-Dichloroethylene0.5 U0.50.5 U0.50.5 U0.50.5 U0.50.5 U0.50.5 U0.5Reference(s)Ref. 6, p. 41; 7, p.28; 8, pp. 149, 205;10, p. 23; 31, p. 2.Ref. 6, p. 33; 7, p.23; 8, pp. 173, 199;10, p. 3; 31, p. 2.Ref. 6, p. 26; 7, p.19; 8, pp. 64, 192;10, p. 12; 31, p. 2.Ref. 6, p. 22; 7, p.17; 8, pp. 67, 192;10, p. 8; 31, p. 2.Ref. 6, p. 15; 7, p.14; 8, pp. 70, 193;10, p. 7; 31, p. 2.Ref. 6, p. 15; 7, p.14; 8, pp. 73, 194;31, p. 2.All concentrations in micrograms per liter (ug/L).RDL = Reporting Detection Limit [i.e., sample quantitation limit (SQL)] [Contract Required Quantitation Limit (CRQL) x contract sample volume (mL)/total volume purged (mL)] [Ref. 29, p. 14].MSL = Feet above Mean Sea Level.U = The analyte was analyzed for, but was not detected at a level greater than or equal to the level of the adjusted CRQL for sample and method [Ref. 30, p. 6].J = The analyte was positively identified and the associated numerical value is the approximate concentration of the analyte in the sample (due either to the quality of the data generated becausecertain quality control criteria were not met, or the concentration of the analyte was below the CRQL) [Ref. 30, p. 6].*The reported concentration is below the RDL; therefore, no adjustment factor was applied [Ref. 8, p. 192; 32, p. 4].15Table 2Release Well Concentrations - VOCsResidential Well Samples - February-March 2010Mansfield Trail Dump, Byram Township, New JerseyWESTON Sample No.:Release Well ConcentrationsBYR-DW113BYR-DW114BYR-DW123BYR-DW117BYR-DW118BYR-DW119BYR-DW120BYR-DW121BYR-DW122BYR-DW124BYR-DW125BYR-DW126BYR-DW127BYR-DW128BYR-DW129BYR-DW131Address:3 Ross Rd.4 Ross Rd.4 Ross Rd.62 Brookwood Rd.64 Brookwood Rd.65 Brookwood Rd.66 Brookwood Rd.67 Brookwood Rd.71 Brookwood Rd.69 Brookwood Rd.70 Brookwood Rd.68 Brookwood Rd.73 Brookwood Rd.74 Brookwood Rd.75 Brookwood Rd.79 Brookwood Rd.EPA Sample No.:B7GG2B7GG3B7GH2B7GG6B7GG7B7GG8B7GG9B7GH0B7GH1B7GH3B7GH4B7GH5B7GH6B7GH7B7GH8B7GJ0Date:3/2/20103/2/20103/2/20102/22/20103/2/20102/24/20103/3/20103/4/20102/23/20103/2/20102/23/20102/24/20103/5/20103/4/20102/22/20103/2/2010Number of Residents:25Dup. of BYR-DW1144553142623455Open Hole Interval (MSL)Unknown750-600750-600730-680730-630Unknown730-495671-610730-655Unknown730-482730-620730-630750-500730-630730-630VOCs (μg/L)ResultRDLResultRDLResultRDLResultRDLResultRDLResultRDLResultRDLResultRDLResultRDLResultRDLResultRDLResultRDLResultRDLResultRDLResultRDLResultRDLTrichloroethylene8.50.51.80.51.80.55.90.54.20.51.30.571 D5.0190.5180.56.70.560 D2.541 D2.5160.558 D2.5180.57.70.5cis-1,2-Dichloroethylene4.80.50.740.50.740.51.60.51.90.50.578 D5.05.30.58.60.53.50.553 D2.536 D2.5120.541 D2.5160.55.10.5Reference(s)Ref. 6, p. 33; 7, p. 23; 8,pp. 155, 195; 10, p. 19.Ref. 6, p. 32; 7, p. 23; 8,pp. 158, 195; 10, p. 13;31, p. 2.Ref. 6, p. 32; 7, p. 23; 8,pp. 164, 197; 31, p. 2.Ref. 6, p. 16; 7, p. 14; 8,pp. 40, 187; 10, p. 11; 31,p. 2.Ref. 6, p. 34; 7, p. 23; 8,pp. 161, 196; 10, p. 20;31, p. 2.Ref. 6, p. 27; 7, p. 19; 8,pp. 43, 187; 10, p. 9.Ref. 6, p. 38; 7, p. 28; 8,pp. 128, 131, 201; 10, p.21; 31, p. 2.Ref. 6, p. 40; 7, p. 28; 8,pp. 134, 202; 10, p. 22;31, p. 2.Ref. 6, p. 20; 7, p. 17; 8,pp. 46, 188; 10, p. 16; 31,p. 2.Ref. 6, p. 35; 7, p. 23; 8,pp. 167, 197; 10, p. 20.Ref. 6, p. 19; 7, p. 17; 8,pp. 49, 52, 189; 10, p. 5;31, p. 2.Ref. 6, p. 26; 7, p. 19; 8,pp. 55, 58, 190, 191; 10,p. 17; 31, p. 2.Ref. 6, p. 42; 7, p. 28; 8,pp. 137, 203; 10, p. 10;31, p. 2.Ref. 6, p. 42; 7, p. 28; 8,pp. 140, 143; 10, p. 24;31, p. 2.Ref. 6, p. 18; 7, p. 14; 8,pp. 61, 191; 10, p. 6; 31,p. 2.Ref. 6, p. 34; 7, p. 23; 8,pp. 170, 198; 10, p. 4; 31,p. 2.All concentrations in micrograms per liter (ug/L).MSL = Feet above Mean Sea Level.RDL = Reporting Detection Limit [i.e., sample quantitation limit (SQL)] [Contract Required Quantitation Limit (CRQL) x contract sample volume (mL)/total volume purged (mL)] [Ref. 29, p. 14].D = The sample or extract is reanalyzed at a dilution factor (DF) greater than 1 (e.g., when the response of an analyte exceeds the response of the highest standard in the initial calibration) [Ref. 29, p. 5].Blank Space = Reported value not used in observed release evaluation.Superfund Chemical Data Matrix (SCDM) Level I Benchmark = 0.21 ug/L [Ref. 2, p. 6].16GW-Observed Release

Attribution:

Previous evidence of site-attributable ground water cont amination is documented by soil and ground water samples collected by NJDEP in 2009 [ Ref. 9, pp. 1-17; 14, pp. 2, 7- 8]. Sampling of ground water shows that no other sources of TCE or cis-1,2-DCE contamination are present in the vicinity of the site. A soil sample was collected from Dump Area A and analyzed for VOCs by the NJDEP mobile laboratory [Ref. 9, pp. 4-7]. Analytical results indicated the presence of TCE (20,342.52 ppm) [Ref. 9, p. 6].

In May 2009, NJDEP installed two monitoring wells east and downgradient of Dump Area A [Figure 4; Ref. 14, pp. 5-6]. The two monitoring wells, MW-1 and MW-2, were both completed to a depth of 100 feet below grade within the underlying fractured bedrock aquifer [Ref. 14, pp. 5-8]. In July and October 2009, NJDEP collected samples from these wells using passive diffusion bags at va rious depths throughout the water column [Ref. 9, pp. 14-17; 14, pp. 2, 7-8]. Total concentrations of TCE, 1,2-DCE, and vinyl chloride in MW-1 ranged from 1.61 parts per billion (ppb) to 9.48 ppb; concentrations in MW-2 ranged from 771 ppb to 835 ppb [Ref. 14, pp. 7-8].

In April 2010, EPA collected waste samples BYR-SLD148, BYR-SLD149 (environmental duplicate of BYR-SLD148), and BYR-SLD150 from the Dump Area A lower trench according to American Society for Testing and Materials (ASTM) standard operating procedures (SOPs), using a dispos able coring body/storage chamber [Figure 2; Ref. 6, p. 48; 23, pp. 6-7; 39, pp. 2-3, 7, 9, 11]. Analysis of waste samples BYR-SLD148, BYR-SLD149, and BYR-SLD150 confirms the presence of TCE at concentrations of 15,000 μg/kg, 170, 000 μg/kg, and 630 μg/kg, respectively and cis-1,2-DCE at concentrations of 81,000 μg/kg, 56,000 μg/kg, and 2,000 μg/kg, respectively [Figure 2; Ref. 40, pp. 8, 12, 16]. There is no liner or other containment system present in Dump Area A that could prevent the vertical migration of contamination into the subsurface [Ref. 6, p. 63; 41, pp. 1-6]. Dump Area A is located on a hilltop directly above the Brookwood and Ross Roads neighborhood [Figure 3; Ref. 4, p. 1]. Samp ling and analysis of ground water samples collected from

residential wells in the Brookwood and Ro ss Roads neighborhood, located downgradient of Dump Area A, indicates that TCE and cis-1,2-DCE are present at concentrations significantly above background concentrations detected in residential wells to the west of the contaminated wells [Figure 3; Tables 1, 2]. Based on topography and the detection of TCE in the residential wells, shallow ground water in the glacial ove rburden beneath Dump Area A is believed to flow west toward Brookwood Road [Figure 3; Re f. 25, p. 1; 26, p. 3].

In April 2006, NJDEP collected an aque ous sample from a ground water seep discharging at 70 Brookwood Road (Block 365.06, Lot 10) [Figure 3; Ref. 28, pp. 2, 8-9]. The property is located northwest and downslope of Dump Area A [Figure 3; Ref. 4, p. 1]. Analysis of the seep sample indicted the presence of TCE (49.67 ppb) and cis-1,2-DCE (61.39 ppb) [Ref. 28, p. 6].

TCE is a colorless liquid used mainly as a solvent to rem ove grease from metal parts and it is also an ingredient in adhesives, paint removers, correction fluids , and spot removers [Ref. 20, p. 1]. TCE is thought not to occur naturally in the environment and is found in ground water as a result of manuf acture, use, and disposal of the chemical [Ref. 20, p. 1]. It can remain in ground water for a long period of time [Ref . 20, p. 1]. In an oxygen-poor environment TCE will break down to form cis-1,2-DCE [Ref. 21, p. 1].

A review of State and Federal environmental databases indicates that there are no known additional sources of TCE or cis-1,2-DCE in the vicinity of the site [Ref. 17, pp. 3-40]. Historical information and topographic maps indicate that neither the site, nor the Brookwood and Ross Roads neighborhood, ha s a history of industrial use [Ref. 18, pp. 3-9; 19, p. 2]. A dry cleaning facility is located approximately 3, 700 feet west-southwest of the intersection of Brookwood and Ross Roads along Route 206 [Ref. 15, p. 1]. However, this f acility is not listed as a generator of hazardous waste in Federal or State databases [Ref. 17, pp. 12-14]. In addition, residential wells that were sampled by EPA and found not to

be contaminated with TCE are located in the west-s outhwest portion of the Brookwood and Ross Roads neighborhood, between the contaminated wells and the location of the dry clean ing facility [Figure 3; Ref. 7, pp. 5-6; 8, pp. 64, 67, 70, 73, 149, 173; 15, p. 1]. A machine shop that designs and manufactures custom machinery and electronic controls is located less than 1 mile southeast of the site; however, a search of Federal and State environmental databases of hazardous waste generators within 1 mile of the site indicates that the facility is not listed as a generator [Ref. 17, pp. 12- 14; 22, p. 1].

17GW-Observed Release

The Byram Bus Co. garage is located east of the site along County Route 605 [Ref. 13, p. 2]. However, the facility is located on the opposite side of a steep, narrow valley that separa tes it from site sources [Ref. 4, p. 1; 13, p. 2]. An

abandoned railroad bed and a divided stream that flows north are located on the valley floor [Ref. 4, p. 1; 13, pp. 1-2; 26, p. 3]. A shallow ground water flow map prepared by a NJDEP geol ogist indicates that this facility is on the other side of a shallow ground water flow divide from the site and that shallow ground water flow beneath the facility flows west toward the valley and the stream [Ref. 26, pp. 1, 3]. Sha llow ground water flow on the east side of the site ridge flows east toward the valley and the stream [Ref. 26, p. 3]. On October 6, 2009, NJDEP collected surface water samples from the stream [Ref. 13, p. 1-2, 4]. Surface water samples SW7, SW8, and SW9 were collected from the east branch of the stream directly downslope of the Byram Bus Co. garage [Ref. 13, p. 2]. Analysis of the surface water samples indicated non-detect values for site contaminants (i.e., TCE and cis-1,2-DCE) [Ref. 13, pp. 26-27, 29-30, 32-33].

On April 22 and 23, 2010, EPA installed Monitoring Well MW-3 south of the existing site monitoring wells previously installed by NJDEP (MW-1 and MW-2) [Figure 4; 35, pp. 1, 3-5]. MW-3’s design is similar to the existing NJDEP monitoring wells with approximately 100 feet of open hole [Ref . 14, pp. 5-8; 35, pp. 3-5]. On May 4, 2010, all site monitoring wells were surveyed by a New Jersey-licensed su rveyor [Ref. 35, pp. 6-10]. On May 6 and 7, 2010, EPA collected ground water samples from the site monitoring wells [F igure 4; Ref. 6, pp. 55-62; 36, pp. 2-3, 9, 11]. The samples were collected in accordance with EPA Region 2’s Ground water Sampling Procedure, Low Stress (Low Flow) Purging and Sampling , dated March 1998 and the chemical analyses were coordinated through the EPA CLP; EPA validated the analytical results according to Region 2 Data Va lidation guidelines [Ref. 6, pp. 55-58, 60-61; 36, pp. 1-2, 9- 12; 35, pp. 11-14; 37, pp. 1-6; 38, pp. 1-9].

Based on static water level depths in each of the monitoring wells measured during the sampling event, and the surveyed elevations of the wells’ inner casings, ground water flow is from south to north, with MW-3 being hydraulically upgradient of MW-1 and MW-2 [Figure 4; Ref. 35, pp. 6- 9, 11-14, 19]. Analysis of ground water samples BYR-GW111 and BYR-GW112 (environmental duplicate sample), collected from MW-3, indicated non-detect values for site contaminants of concern (i.e., TCE and 1,2-DCE) [Figure 4; Ref. 6, p. 56; 36, p 3; 37, pp. 10-11]. Analysis of ground water samples BYR-GW109 and BYR-GW110, collected from MW-1 and MW-2, respectively indicated the presence of TCE at concentrations of 10 μg/L and 16 μg/L, respectively [F igure 4; Ref. 6, pp. 58, 61; 36, p. 3; 37, pp. 7, 9]. Monitoring wells MW-1 and MW-2 are located between Dump Areas B and D [Figure 4]. Sampling and analysis of soil samples collected from Dump Area D by the NJDEP in 2009 and from Dump Area B by EPA in 2010 also indicated the presence of TCE [Ref. 7, p. 4; 8, p. 12; 9, pp. 12]. Theref ore, the analytical data from MW-3 demonstrates that the TCE detected in the residential wells in not coming from an off-site s ource to the south-southeast.

Hazardous Substances Released:

Trichloroethylene (TCE) cis-1,2-Dichloroethylene (cis-1,2-DCE)

==================================================================================

Ground Water Observed Release Factor Value: 550

18GW-Waste Characteristics

3.2 WASTE CHARACTERISTICS

SOURCE DESCRIPTION

Number of the source: Source No. 1

Name and description of the source: Dump Area A (lower trench)

Source Type: Surface Impoundment (buried/backfilled)

The source under consideration is the Dump Area A (lower trench) surface impoundment [Figure 2; Ref. 1, p. 51591; 6, pp. 48, 63; 39, p. 3]. Although Dump Area A consists of two trenches (upper and lower), waste samples were only collected from the lower trench [Figure 2; Ref. 6, p. 48; 39, pp. 1-3]. Therefore, the lower trench is evaluated as the source. Dump Area A is located on a ridgeline that trends s outhwest to northeast, directly upslope of and overlooking the Brookwood/Ross Roads neighborhood to the west [Figures 2, 3; Ref. 4, p. 1; 14, pp. 2-3]. In April 2010, EPA collected three waste samples from Dump Area A (BYR-SLD148, BYR-SL D-149, and BYR-SLD-150) [Figure 2; Ref. 6, p. 48; 39, pp. 1-3, 9, 11]. The waste samples were analyzed for TCL VOCs through the EPA CLP [Ref. 39, pp. 1-2, 9, 11; 40, pp. 1-2, 8, 12, 16]. The waste samples were received by th e laboratory intact and under custody [Ref. 39, p. 11]. The sample analytical data were validated by EPA Region 2 and de termined to be valid and acceptable [Ref. 40, pp. 2, 8, 12, 16]. The Sample Quantitation Limits (SQLs) (i.e., Repor ting Detection Limits) for BYR-SLD148, BYR-SLD149, and BYR-SLD150 were 24 μg/kg, 21 μg/kg, and 20 μg/kg, respectiv ely [Ref. 40, pp. 22-23, 25]. Analytical results indicate that the waste samples from Dump Area A are contaminat ed with TCE (15,000 μg/kg, 170,000 μg/kg, and 630 μg/kg) and cis-1,2-DCE (81,000 μg/kg, 56,000 μg/kg, and 2,000 μg/kg) [Figure 2; Ref. 40, pp. 8, 12, 16].

The Resource Conservation and Recovery Act (RCRA) defines a solid waste as, among other characteristics, a discarded (i.e., abandoned) material that is inherently waste-like [Ref. 34, p. 1]. The material observed and sampled in Dump Area A consists of a man-made waste material that possesses a color and texture different from the surrounding soil [Ref. 6, pp. 92-93]. Sampling and analysis of residential well samp les collected by EPA in February-March 2010 indicates that

the TCE contamination extends to 15 residential wells serving 56 residents in the Brookwood and Ross Roads neighborhood, at Level I concentrations ranging from 1.3 to 71 μg/L [Table 2; Figure 3; Ref. 2, p. 6].

Containment Release to ground water: No evidence of a liner, maintained engineered cover, or other containment features were present during the site reconnaissance or subsequent sampling at the site, therefore, a containment factor of 10 is assigned [Ref. 1, p. 51596; 6, p. 43; 41, pp. 1-6].

Other Sources NJDEP and EPA have identified two other sources and one poten tial source that are not used in scoring the site. In September 2009, NJDEP collected soil samples from Dump Areas B and D [Figure 2; Ref. 9, pp. 8-13]. Analysis of the soil sample from Dump Area B indicated the presence of va rious methylated and chlorinated benzene compounds, such as 1,2,4-trimethylbenzene (80.24 ppm) and 1,2-dichlorobenzen e (202.39 ppm) [Ref. 9, pp. 8-11]. Analysis of the soil sample collected from Dump Area D indicated the presence of cis-1,2-DCE (2.22 ppm), TCE (10.28 ppm), as well as various chlorinated benzene compounds [Ref. 9, pp. 12-13]. Analysis of soil and waste samples collected by EPA in February-March 2010 confirmed the presence of chlorinated be nzene compounds in Dump Area B [Figure 2; Ref. 6, pp. 17, 36; 7, pp. 6, 26; 8, pp. 12, 114, 117]. Dump Area C cons ists of a disturbed area adjacen t to Dump Area B [Figure 2; Ref. 6, pp. 6-7, 65]. Although no waste material similar to that found in Dump Areas A, B, and D has been observed in this area, during the December 2009 reconnaissance NJDEP identified it as an area of concern based on evidence of dumping, such as the presence of tires and miscellaneous debris on the surface, as well as the area’s proximity to Dump Area B [Figure 2; Ref. 6, p. 6].

19GW-Waste Characteristics

3.2.1 Toxicity/Mobility

Hazardous Source Toxicity Mobility Toxicity/

Substance Numbers Factor Value Factor Value Mobility Reference(s)

Cis-1,2-Dichloroethylene 1, OR 100 1.0 100 2, p. 4 Trichloroethylene 1, OR 10,000 1.0 10,000 2, p. 6

OR = Observed Release

3.2.2 Hazardous Waste Quantity

Hazardous Waste Quantity (HRS Section 2.4.2)

Area (HRS Section 2.4.2.1.4)

Sampling and analysis by EPA in 2010 showed the presence of TCE-contaminated waste in the lower trench within Dump Area A [Figure 2; Ref. 6, p. 48; 39, p. 3; 40, pp. 8, 12, 16]. The lower trench encompasses an area of approximately 1,200 square feet (120 feet x 10 feet) [R ef. 6, p. 5]. The source type is ‘Surface Impoundment (buried/backfilled),’ so the area value is divided by 13 to obtain the assigned value, as shown below [Ref. 1, p. 51591].

Dimension of source (ft 2 ): 1,200 ft 2
Area (A) Assigned Value: (1,200)/13 = 92.3

Sum of Values: 92 (rounded to nearest intege r as specified in HRS Section 2.4.2.2)

The sum corresponds to a hazardous waste quantity factor va lue of 1 in Table 2-6 of the HRS [Ref. 1, p. 51591]. However, the HRS states that if any target is subject to Level I or Level II concentrations, assign either the value from Table 2-6 or a value of 100, whichever is greater, as the h azardous waste quantity factor value for that pathway [Ref. 1, p. 51592].

3.2.3 Waste Characteristics Factor Category Value

TCE corresponds to the toxicity/mobility factor value of 10,000, as shown previously (see Section 3.2.1).

Toxicity/Mobility Factor Value (10,000) x Hazardous Waste Quantity Factor Value (100): 1 x 10 6

The product (1 x 10 6 ) corresponds to a Waste Characteristics Factor Cate gory Value of 32 in Table 2-7 of the HRS [Ref. 1, p. 51592].

==================================================================================

Toxicity/Mobility Factor Value: 10,000 Hazardous Waste Quantity Factor Value: 100 Waste Characteristics Factor Category Value: 32

20GW-Targets

3.3 TARGETS

Sampling and analysis of residential well samples collected by EPA in February and March 2010 indicated that 56 people are served by private wells contaminated with Level I concen trations of TCE [Table 2]. EPA collected pre-treatment residential well samples from 21 homes in the Brookwood a nd Ross Roads neighborhood [Figure 3; Ref. 6, pp. 15-16, 18-20, 22, 26-27, 30, 32-35, 39-42; 7, pp. 4-6, 12, 14, 17, 19, 21, 23, 28]. The samples were analyzed for TCL VOCs through the EPA CLP and the data was valid ated according to EPA Region 2 Data Validation guidelines [Ref. 7, pp. 1, 3, 14, 17, 19, 21, 23, 28; 8, pp. 35-78, 119-178]. Analytical results indicate that 15 of the 21 residential wells are contaminated with TCE at concentrations significantly a bove background [Tables 1, 2]. Numerous public supply wells and wellhead protection areas are located within 4 miles of Dump Area A [Ref. 16, p. 1].

Level I Samples

Site-attributable TCE was detected at Level I concentrations in 15 of the 21 residential wells sampled by EPA in February and March 2010 [Figure 3; Tables 1, 2; Ref. 2, p. 6]. The total populati on served by these wells is 56 [Table 1].

Level II Samples

Since Level I concentrations result in a maximum score of 100.00 for the ground water migration pathway, Level II

concentrations were not scored.

3.3.1 Nearest Well

The drinking water well at 66 Brookwood Road that serves thr ee residents is located less than 0.25 mile northwest of Dump Area A and is subject to a Level I concentration (EPA Sample No. BYR-DW120); therefore, a nearest well factor value of 50 is assigned [Figure 3; Table 2; Ref. 1, pp. 51602-51603; 2, p. 6; 10, p. 21; 31, p. 23].

===================================================================================

Nearest Well Factor Value: 50

21GW-Targets 3.3.2 Population

3.3.2.2 Level I Concentrations

The Level I benchmark for TCE listed in the Superfund Chem ical Data Matrix (SCDM) is 0.21 μg/L (cancer risk screening concentration) [Ref. 2, p. 6] . Site-attributable TCE was detected at Level I concentrations in 15 of the 21 residential wells sampled by EPA in February and March 2010 [Fi gure 3; Tables 1, 2; Ref. 2, p. 6]. The total population served by the wells showing Level I concentrations is 56 [Table 2].

Address Population Served By

Well

3 Ross Rd. 2

4 Ross Rd. 5

62 Brookwood Rd. 4

64 Brookwood Rd. 5

65 Brookwood Rd. 5

66 Brookwood Rd. 3

67 Brookwood Rd. 1

71 Brookwood Rd. 4

69 Brookwood Rd. 2

70 Brookwood Rd. 6

68 Brookwood Rd. 2

73 Brookwood Rd. 3

74 Brookwood Rd. 4

75 Brookwood Rd. 5

79 Brookwood Rd. 5

===================================================================================

Population Served by Level I Wells: 56 Level I Con centrations Factor Value: 560 [Ref. 1, p. 51603]

3.3.2.3 Level II Concentrations

Since Level I concentrations result in a maximum score of 100.00 for the ground water migration pathway, Level II

concentrations were not scored.

===================================================================================

Population Served by Level II Wells: NS Leve l II Concentrations Factor Value: NS

3.3.2.4 Potential Contamination

Since Level I concentrations result in a maximum score of 100.00 for the ground water migration pathway, the Potential

Contamination Factor Value was not scored.

=================================================================================== Potential Contamination Factor Value: NS

2223 GW-Targets

3.3.3 Resources

Since Level I concentrations result in a maximum score of 100.00 for the ground water migration pathway, the Resources

Factor Value was not scored.

===================================================================================

Resources Factor Value: NS

3.3.4 Wellhead Protection Area

Since Level I concentrations result in a maximum score of 100.00 for the ground water migration pathway, the Wellhead

Protection Area Factor Valu e was not scored.

===================================================================================

Wellhead Protection Area Factor Value: NS