### DuPont Corporate Remediation Group

Chestnut Run Plaza 715-240

974 Centre Road

P.O. Box 2915

Wilmington, DE 19805

E.I. du Pont de Nemours and Com p an y 

# October 31, 2014

Carole Petersen, Chief

U.S. EPA, Region 2

New Jersey Remediation Branch

Emergency and Remedial Response Division

290 Broadway

New York, NY 10007-1866

DuPont Chambers Works Complex

NJPDES-DGW Permit No. NJ0083429

Off-Site Monitoring for Perfluorinated Compounds Groundwater Results



# Dear Ms. Petersen:

DuPont has agreed in a letter to the U.S. Envi ronmental Protection Agency (EPA) dated June 17,

2014, on the EPA and New Jersey Department of Environmental Protection (NJDEP) request to

conduct an additional sampling event of the 20 o ff-site monitoring simultaneously with the

planned July 2014 NJDPES-DGW semi-annual gr oundwater monitoring event. Samples have

been analyzed for the same analytes in the ad ditional sampling event of the off-site monitoring

wells as in the 2010 sampling event for the 20 off-site wells.

DuPont sampled the wells in July 2014 in accordan ce with the sampling and analysis plan (SAP).

The well locations are shown with PFOA results in Figure 1. PFOA was detected at varying

concentrations ranging from 0.039 micrograms per li ter (μg/L) at well CC2 3-M01A to 0.95 μg/L

at well G05-M01A (see Table 1). PFNA was detect ed at varying concen trations ranging from

0.0013 μg/L at well EE16-M01B to 0.21 μg/L at well S09-M01A (see Table 2 and Figure 2).

Figure 3 illustrates the new 2014 data along with prior sampling data.

If you have any questions, please contact me at 302.999.6197.

Very truly yours,

Andrew S. Hartten

Project Director

Corporate Remediation – NJ

cc: Sin Kie Tjho, EPA Region 2

Edward Lutz, DuPont (Database Link)

Allan Motter, NJDEP

Linda Range, NJDEP

Carole Chatelain, NJDEP

File: 509026Table 1Summary of Analytical ResultsPFOA Monitoring ProgramPerfluorooctanic Acid (PFOA)Second Semester 2014DuPont Chambers WorksDeepwater, New JerseyLocationG04-M01A II20-M01A O02-M01A P04-M01A R04-M01A R04-M01B R06-M01A S09-M01A U08-M01A X18-M01ASample Date07/23/2014 07/28/2014 07/23/2014 07/23/2014 07/28/2014 07/28/2014 07/23/2014 07/23/2014 07/23/2014 07/25/2014AquiferAAAAABAAAAAnalyteUnits Sample Type1111111111PFOA UG/L 0.95 0.16 0.79 0.65 0.59 0.89 0.67 1.20 0.80 2.30LocationY31-M01A BB31-M01A BB31-M01B CC23-M01A EE16-M01A EE16-M01B OSW-1 OSW-2 OSW-3 OSW-4Sample Date07/25/2014 07/25/2014 07/25/2014 07/28/2014 07/25/2014 07/25/2014 07/28/2014 07/28/2014 07/28/2014 07/25/2014AquiferAABAABBAAAAnalyteUnits Sample Type1111111111PFOA UG/L 0.14 0.62 0.50 0.039 0.32 0.27 0.26 0.15 0.14 0.32Notes:ND = Non detect at stated reporting limitPFOA = Perfluorooctanoic AcidSample Type 1 = Regular SampleSample Type 2 = Duplicate SamplePage 1 of 12H14 Off-Site Tables \ Table 1 (PFOA)Table 2Summary of Analytical ResultsPFOA Monitoring ProgramPerfluorooctanic CompoundsFirst Semester 2014DuPont Chambers WorksDeepwater, New JerseyLocationG04-M01A II20-M01A O02-M01A P04-M01A R04-M01A R06-M01A S09-M01A U08-M01A X18-M01A Y31-M01ASample Date07/23/2014 07/28/2014 07/23/2014 07/23/2014 07/28/2014 07/23/2014 07/23/2014 07/23/2014 07/25/2014 07/25/2014AquiferA AAAAAAAAAAnalyte Units Sample Type1 111111111PFBA UG/L 0.32 0.054 0.18 0.23 0.69 0.29 0.25 0.23 0.31 0.025 JPFBS UG/L <0.0052 0.0065 0.009 0.022 0.014 0.0073 0.0052 0.0039 <0.012 UJ <0.0028PFDA UG/L 0.063 <0.0010 0.027 0.0058 <0.0025 <0.0010 0.0097 0.0012 0.025 0.1PFDOA UG/L 0.0075 J 0.0063 0.0019 J <0.00091 <0.0025 <0.0010 <0.0020 UJ <0.0010 <0.0050 UJ 0.0013 JPFHPA UG/L 0.42 0.18 0.45 0.39 J 1.2 0.40 J 0.39 0.38 0.57 0.061PFHXA UG/L 1 0.17 0.63 0.48 J 1.2 0.49 J 0.52 0.41 0.79 0.062PFHXS UG/L <0.0044 0.002 <0.0020 <0.0018 <0.013 <0.0023 <0.0041 <0.0020 <0.010 UJ <0.0020PFNA UG/L 0.16 0.0038 0.17 0.11 0.0055 0.042 0.21 0.19 0.12 0.079PFOS UG/L 0.0084 <0.0020 0.012 0.0028 <0.015 <0.0020 <0.0059 0.023 <0.010 UJ 0.0035PFOSA UG/L <0.0022 <0.0010 <0.0010 <0.00091 <0.0025 <0.0010 <0.0020 <0.0010 <0.0050 <0.0010PFPEA UG/L 0.61 0.2 0.42 0.32 J 1.7 0.38 J 0.64 0.42 0.57 0.043PFUNA UG/L 0.0067 <0.0010 <0.0010 <0.00091 <0.0025 <0.0010 <0.0020 <0.0010 <0.0050 <0.0010LocationBB31-M01A CC23-M01A EE16-M01A R04-M01B BB31-M01B EE16-M01B OSW-1 OSW-2 OSW-3 OSW-4Sample Date07/25/2014 07/28/2014 07/25/2014 07/28/2014 07/25/2014 07/25/2014 07/28/2014 07/28/2014 07/28/2014 07/25/2014AquiferA AABBBBAAAAnalyte Units Sample Type1 111111111PFBA UG/L 0.13 0.02 0.089 0.3 0.11 0.077 0.13 0.064 0.047 <0.015 RPFBS UG/L 0.0074 <0.0020 0.0041 0.008 0.0071 0.0065 0.0046 0.0029 0.0028 0.0071 JPFDA UG/L 0.016 <0.0010 <0.0010 0.0025 0.012 <0.0010 0.0067 <0.0010 0.0032 0.0033PFDOA UG/L <0.0010 <0.0010 UJ <0.0010 <0.0020 UJ <0.0010 <0.0010 <0.0010 UJ <0.0010 <0.00099 <0.0011 UJPFHPA UG/L 0.25 0.034 0.19 0.49 0.2 0.15 0.33 0.088 0.075 0.18 JPFHXA UG/L 0.24 0.047 0.2 0.68 0.19 0.17 0.29 0.089 0.076 0.23 JPFHXS UG/L 0.0036 <0.0020 <0.0020 <0.0039 0.0048 <0.0020 <0.0021 <0.0021 <0.0029 <0.0029 UJPFNA UG/L 0.085 <0.0010 0.0083 0.058 0.071 0.0013 0.037 0.02 0.071 0.02PFOS UG/L 0.03 <0.0020 0.0077 0.03 0.028 <0.0020 0.014 0.0061 0.012 0.0029PFOSA UG/L <0.0010 <0.0010 <0.0010 <0.0020 UJ <0.0010 <0.0010 0.0015 <0.0010 <0.00099 UJ <0.0011PFPEA UG/L 0.29 0.055 0.19 0.63 0.23 0.18 0.29 0.14 0.087 0.083 JPFUNA UG/L <0.0010 <0.0010 <0.0010 <0.0020 <0.0010 <0.0010 <0.0010 <0.0010 <0.00099 <0.0011Notes:ND = Not detected at stated reporting limit PFBA = Perfluorobutanoic Acid PFHPA = Perfluoroheptanoic Acid PFOS = Perfluorooctane Sulfonic AcidSample Type 1 = Regular SamplePFBS = Perfluorobutane Sulfonic AcidPFHXA = Perfluorohexanoic AcidPFOSA = Perfluorooctane SulfonamideSample Type 2 = Duplicate SamplePFDA = Perfluorodecanoic AcidPFHXS = Perfluorohexane Sulfonic AcidPFPEA = Perfluoropentanoic AcidJ = Reported value may not be accurate or precise. PFDOA = Perfluorododecanoic AcidPFNA = Perfluorononanoic AcidPFUNA = Perfluoroundecanoic AcidUJ = Not detected. Reporting limit may not be accurate or precise.Page 1 of 12H14 Off-Site Tables \ Table 2 (PFCs)

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