AR226-2108 Test Results Industrial jHygiene Sample Date Range Concentration Range 1/1<81 1231/81 Action Leviil 100% ' Sample Dt Sampled Duration Type Employee Name Pers Cheinica!

AR226-2269 STT-91-1 11.

AR226-2346 'WSi9fvasay Air Dispersion Modeling Verification Study Oct 22,2003 Objective Compare results from ambient air sampli air dispersion modeling to understand ho modeling predictions relate to measured air concentrations Verification Study Scope Air Sampling Program Analytical Methods Modeling Analysis of Results Air Sampling Locations Simultaneous coverage of all 4 major directions (N, S, E, W) Capture point of predicted maximum concentration from modeling Include co-located samplers at predic maximum Total of six locations ASH026725 EXPQ15794 ASH026726 EXP015795 Air Sampling Strategy Measure ambient air levels i 24-hour sampling duration Seven (7) sampling events scheduled ove weeks Vary day of week to capture variations in operations (none expected) and variation meteorology Record site-specific meteorological and operational data ^ Monitoring Strategy: Samples taken every 6 days f MONTH 1 QZ 345 6 8 9 10 11 12(^14 15 16 17 18^9)2021 22 23 2^5)26 27 28 29 3( MONTH 2 1234 5^)7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Monitoring Strategy: Samples taken every 6 days f On site training For internal use: potential schedule Oct/Nov S M T W Th F S -28 2931 1 678 2 3 4^^ 9 10^^12 13 14 If 16 <Ql8 19 20 21^ ^5)24 25 26 if^n^ 30 December 1 2 3 4Q)6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Total Samples (1) field blank per event (5) primary samples per event (1) duplicate sample per event* (7) samples x (7) sampling events = 49 tota * Sample location 3 is co-located with location 2 and se as a duplicate sample Equipment "Sorbent" sampling method to captur PFOA on ion-exchange media OSHA Versatile Sampling tube (OVS Captures particles and vapors Remote power source will be provide Weatherproof stations for sampling equipment OVS Tube Air flow (1 L/min) Analytical Method Validated method being used Acetone extraction followed by liquid chromatography/mass spectrometry (LC/MS) Detection limit of 0.1 ug/m3 Modeling Program Using U.S.

AR226-2479 George Woytowich 09/20/2000 08:11 AM To: cc: Subject: Roger J Zipfel/AE/DuPontDuPont Robert L Ritehey/CUDuPont DuPont 9/18/00 Water Samples Do you think we should be able to pick up C-8 in the river on the cited tests?

AR226-2525 dL^> /L^-, - /5:800 c^s - ^ ^ENNY, ;l_o, ci-or) C.

C-8 DETECTED HASHINGTON WORKS SITE SUPERNATE POND AREA - CONTAMINATED SOIL - 6ROUNDWATER (-20 FT,) WEST END OF SITE - WELLS 27 & 4 - 6ROUNDWATER (-75 FT.)

AR226-2650 ^ .t^ I 0 AR226-2650 ISC Modeling Methodology and Results Introduction This report summarizes dispersion modeling that was completed in support of interim updates to R13 permits 1953B and 2365C at the DuPont Washington Works site.

. r u PATION BOGGS.

AR226-2778 FOR DU POMT USE ONLY Copies to Haskell E.

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AR226-3020 naB& uuaRiatar 9R TsaEioo&QOT && Sufoafc HLR 35-i-.

TRADE SECRET Study Title H-23004: SKIN IRRITATION TEST IN RABBITS LABORATORY PROJECT ID: HL-1997-01294 AR226-3085 AUTHOR: Tracy A.

ra_z 32e 54 "eo TRADE SECRET ARAZ6_ 3254 DuPonc11111 Study Title H-25357: Acute Eye lritation Study in Rabbits Laboratory Project ID: DuPont-11111 TEST GUIDELINES: U.S.

#R226 -- 326] 443 H25231: Developmen Tsiiy SdinRyas ~ `TRADE SECRET ARR26 - 326] Duron 10209 Study Title H-25231: Developmental Toxicity Study in Rats Laboratory Project ID: DuPont-10309 TEST GUIDELINES: U.S.

fiRage _ 3264 448 H25231: One.Generation Reproduction Sudy in Rs --~ TRADE SECRET Dupont763 A236 3264 Study Title F-25231: One-Generation Reproduction Study in Rats Volume 20f 3 Laboratory Project ID: DuPont-9763 AuTHOR: Eve Mylchreest, Ph.D. --~ STUDY COMPLETED ON: January 31,2003 | PERFORMING LABORATORY: EHaLskdelulPLoanbtodreatNoermyofuorrsHeaanldthCaonmdpEannvyironmental Sciences | NElekwtaornkR,oDaedl,aPw.aOr.e B1o9x71540-0050 ---- = | SERVICE Cope. edl ~~ EETY CT Company Saniized.