From: To: CC: Sent: Subject: Attachments: Berkoski, Daniel T CIV NAVSEA, SEA 05 Hunstad, Mary P CIV NAVSEA HQ, SEA 05 Fletcher, Steven G CIV NAVSEA HQ, SEA 05 2/10/2017 6:48:15 PM RE: GAO 100947 - AFFF Questions Rev3 vem cmts 2-10-17.docx GAO 100947 - AFFF Questions Rev4 vem cmts 2-10-17.docx Mary, I accepted and cleaned up the formatting changes and minor wording changes that Veronica proposed.

From: To: CC: Sent: Subject: Attachments: Berkoski, Daniel T CIV NAVSEA, SEA 05 Hunstad, Mary P CIV NAVSEA HQ, SEA 05 Fletcher, Steven G CIV NAVSEA HQ, SEA 05 11/9/2016 7:04:46 PM FAAAFFF Question NRL Information Paper for19392C4_Firefighting Foam lnquiry_combined (4)....doc Mary, See below. v/r, Dan ......Original Message......

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AR226-2614 AR226-2614 DUPONT TELOMER MANUFACTURING SITES: ENVIRONMENTAL ASSESSMENT OF PFOA LEVELS IN AIR AND WATER Date: September 2003 Project No.: 508501 18983843.00003 CORPORATE REMEDIATION GROUP An Alliance between DuPont and URS Diamond Barley Mill Plaza, Building 27 Wilmington, Delaware 19805 DuPont Telomer Manufacturing Sites: Environmental Assessment of PFOA Levels In Air and Water Table of Contents TABLE OF CONTENTS Executive Summary....................................................................................................... iv 1.0 1 Introduction............................................................................................................ 1.1 Chambers Works........................................................................................... 1 1.2 Washington Works........................................................................................ 2 2.0 Data Analysis and Analytical Reporting................................................................. 3 3.0 Air Dispersion Modeling........................................................................................ 4 3.1 Chambers Works - ISC3 Modeling Methodology and Results....................... 4 3.1.1 Emission Source Information............................................................ 4 3.1.2 Modeling Methodology.................................................................... 4 3.1.3 Modeling Results.............................................................................. 4 3.2 Washington Works - Screen3 Modeling Methodology and Results................ 6 3.2.1 Data and Modeling Procedures......................................................... 6 3.2.2 Modeling Results.............................................................................. 8 4.0 Chambers Works Groundwater Sampling............................................................... 9 4.1 9 Background................................................................................................... 4.2 Regional Geology.......................................................................................... 9 4.3 Site Geology.................................................................................................. 9 4.4 Site Hydrogeology....................................................................................... 10 4.5 Sample Location Selection........................................................................... 11 4.6 Sampling Activities and Results................................................................... 11 4.7 Summary of Results..................................................................................... 12 5.0 Chambers Works Surface Water Sampling........................................................... 14 5.1 Site Effluent Sample Results........................................................................ 14 5.2 Chambers Works and Upstream Surface Water Intake Results..................... 14 5.3 Delaware River Surface Water Sampling..................................................... 15 5.3.1 Delaware River-Discussion of Results.......................................... 16 5.4 Salem Canal................................................................................................. 17 5.5 Summary of Results..................................................................................... 17 6.0 18 Conclusions.......................................................................................................... 7.0 19 References............................................................................................................

AR226-2628 16 Appendix 1 Chemical Analysis of Concentrations in Groundwater C8 (pg/l); period 1993 to 1996 DuPont coordinates Eastern Northern lm] [m] Monitoring Well Freatic layer 1947 546 108 2204 350 118 2190 627 119 1998 663 301 2082 683 302 2084 671 303 2243 686 305 2296 633 307 2208 513 308 1950 592 310 1950 608 311 1950 625 312 1950 640 313 2237 405 314 2275 279 315 2058 677 316 2106 689 317 2240 575 318 First aquifer 2235 2275 405 MF-02 277 MF-03 1543 1930 19 N-07 20 N-08 2038 20 N-09 2319 20 N-10 2004 69 N-13 2355 119 N-15 2008 467 N-17 1900 277 N-18 2030 352 N-19 1929 177 N-20 1855 404 N-21 2174 272 N-23 2108 1975 -7 N-25 -100 N-26 1872 1989 -17 N-27 99 N-28 2104 1890 2087 1969 1944 1880 84 W-02 68 W-03 668 W-05 426 W-06 275 W-08 23 W-09 Second aquifer 2030 352 N-19 2174 272 N-23 1989 99 N-28 1969 1944 426 W-06 275 W-08 Date of sampling 1993 feb '94 okt "94 1.9 0.5 13.0 9.7 9.7 11.0 5.9 0.3 13.0 0.0 0.4 0.4 0.2 3.9 0.6 0.7 28.0 0.35 0.0 1.5 0.6 0.2 0.3 0 0 0 Average aug '95 dec '95 mrt'96 concentration 1700 1.6 170 79 3.9 5500 260 82 56 280 250 480 24 100 100 190 70 510 1900 0 0.1 33.0 1.1 9.0 15.0 1.0 7.3 7.1 0.1 9.4 0.4 0.2 0.1 0.1 0.1 2 170 90 4 5500 1700 260 190 76 56 280 250 480 24 100 510 1900 0 0.1 33.0 1.9 0.8 10.6 12.4 8.5 0.3 13.0 0.0 0.4 0.4 0.2 1.0 7.3 7.1 0.1 9.4 3.9 0.7 28.0 0.2 0.8 0.2 0.2 0.1 0.1 0.0 0.1