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Mr. Joseph Karpa NJ Department of Environmental Protection CHMM, Site Manager Bureau ofCase Management 401 East State Street P.O . Box 028 Trenton, NJ 08625-0028 REN 

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Perfluorooctanoic Acid Groundwater Investigation Report Addendum II DuPont Chambers Works, Deepwater, New Jersey Dear Mr. Karpa: Please find enclosed one copy ofthe Perfluorooctanoic Acid Groundwater Investigation Report AddendumII . Also included are three copies ofthe report on CD and three sets ofhard copies of the figures. Also included is a separate CDthat contains the data in Hazsite tab delimited format . Please note the compounds do not pass the Electronic Data Submittal Application (EDSA) . Results for PFOA and PFOS do not pass EDSA because the laboratory certification number assigned by the state of New Jersey to AXYS Analytical Services Ltd. is seven characters (CANA005) but EDSA will only accept five characters. In addition, therecurrently are no laboratories certified by New Jersey for the other 11 perthioroalkyl substances (PFAS's) . As detailed within the report, DuPont recommends the continued monitoring of PFOA and the 12 PFAS's in groundwater across the site in accordance with the NJPDES-DGW Permit No. NJ0083429

. Under this permit, DuPont monitors 36 wells throughout the site semi-annually for PFOA and the 12 PFAS's. If you have any questions or want to discuss further any aspect ofthe report, please call me at 302-999-6197. - Very truly yours, 

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cc: David Doyle, DRMRBEERA Anne Pavelka, DRMR/BGWPA Sin-KieTjho, EPA, Region 11 

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DuPont Corporate Remediatlon Group Chestnut Run Plaza, Building 715 4417 Lancaster Pike Wflrongton, DE 19805 March 23, 2011

Andrew S. Hartten Project Director Corporate Remediataon - NJ rV



## CONTAINS t,10 Cef El d. Pea r . Nxnour . .nd ceap .wDuPont Chambers Works Perfluorooctanoic Acid Groundwater Investigation Report Addendum(March 2011) CERTIFICATIONI "I certify under penalty of law that the information provided is true, accurate and complete. I am

aware that there are significant civil penalties for knowingly submitting false, inaccurate or incomplete information and that I am committing a crime of the fourth degree if I make a written false statement which I do not believe to be true. I am also aware that if I knowingly direct or authorize theviolation ofanystatute, I am personally liable for the penalties." 

### 3-1~- l~ Andrew ~S: -Har-Ete~- nate-- DuPont corporate Remediation Group Project Director

WITNESSEDTHIS 1'1 DAY OF M a +~- k , 20 1. I 

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j~- Sally Prosser Notary PublicDuPont Chambers Works

Perfluorooctanoic Acid Groundwater Investigation Report AddendumII (March 2011) CERTIFICATION II "I certify under penalty of law that I have personally examined and amfamiliar with the information submitted in this document and all attached documents, and that based on my inquiry ofthose individuals responsible for obtaining the information, I believe that the submitted information is true, accurate and complete. I am aware that there are significant civil penalties for knowingly submitting false, inaccurate or incomplete information and that I amcommitting a crime of the fourth degree if I make a written false statement which I do not believe to be true. I am also aware that if I knowingly direct or authorize the violation of any statute, I am personally liable for the penalties."

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T L, Du~'ont CorporatyRemSdiation Group Remediation TeamManager

WITNESSEDTHIS h DAY OF IN1A~-c G` , 20 1 A Sally Prosser Notary Public