Report Title Evaluationofthe Northwest BioanalyticalMethod Validation Reports for PFOSandRinelMaeteetdiAnngatlhyeteRseiqnuiHruemmeanntSseorfutmheorPlasma EDABioanalyticalMethod Validation QAI Report No. 405-503 _ Data Requirement Full Validation of Bioanalytical Method Author - Nancy Benson Philippe Ourisson QUALITY ASSOCIATES, INC. 9017 Red Branch Road, Suits 102 Columbia, MD 21045 ( Sponsor 3M Environmental Laboratories 935 Bush Avenue Bldg 2-36-08 St Paul, MN 55106 Report Date December 31, 2001 Report Number QAI 405-503 Number of Pages 2 .

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AR226-2064 WASHINGTON WORKS INDUSTRIAL- HYGIENE REPORT FROM 1-Jan-1988 TO Sl-Oct-I'm AREAs FLUOROCARBONS - COPOLYMER8 Sl-Oct-lWl Page I CHEMICAL SAMPLE LOCATION ft;CONTROL C-8/FC-143 216 PERSONAL SAMPLE-WET FINISHING s DATEs ll-Apr-1988 NOTEBOOK; 31841,Pia5 EMPLOYEE 4K451E DURATIONS 0390 CONCs 0.116 MPB PERS CODEs SAMPLE TYPES P PERCENTAGE; El% C-8/FC-143 216 PERSONAL SAMPLE-WET FINISHING 8 DATE; lB-Apr-1988 NOTEBOOKS 31E41 ,P1S8 EMPLOYEE #04304 DURATION!

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AR226-2261 815D(FP/D) 815D(FP/D) SOURCE ID 647 699 614A(FEP1) 231 614A(FEP2) 232 1953(FEP3) 242 2365A (PFA) 274 2003 Production annual lb 0 4.300,000 2,700,000 2,500,000 3,903,900 3,903,900 3,346,200 1,977,000 QPU 0.0025 0.0035 0.0045 0.0051 0.0051 0.0051 0.0065 Fraction to Dryer 0,92 0.4 0.4 0.4 0.7 Scrubber Elf EMISSION RATE (Ib/yr) EMISSION RATE (G/S) 0.85 4340.1 0.0625 0.93 0.93 0.93 0.93 557.5 557.5 477.8 629.7 0.0080 0.0080 0.0069 0.0091 FCP Total 11,154,000 Split Lines 1,2,&3 as 35/35/30 Line 3 QPU raised to 0.0051 per current operations

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REVISED Material Tested E.

Copies to; AR226-2877 E. 1. du Font de Neroours and Company Haskell Laboratory for Toxicology and Industrial Medicine HASKELL LABORATORY REPORT NO. 376-79 Material Tested Haskell No. 13.072 Other Codes Sample Re-ady for Testing 6/8/79 Material Submit .Plastic Prod Parkerisburg, West Virginia DEPARTMENT Of TRANSPORTATION SKIM CORROSION TEST ON RABBIT SKIN Procedure; Six albino rabbles, weighing between 2-3 kg^ were.c^i.predl free of--hair .on the hack and stocks. 0.5 ml** of the ILCSL material (as supplied) was applied under 1.5 by 1.5 inch, 12-ply cot trunk of each rabbit was then loosely'wrapped with rubber sheeting.

FOR DU FONT USE ONLY AR226-2893 E.

FOR DU POUT USE ONLY Copies fco AR226-2900 E.

TRADE SECRET AR226-3081 DuPontHL-1997-00867 Study Title H-22762: ORAL APPROXIMATE LETHAL DOSE (ALD) IN RATS LABORATORY PROJECT ID: HL-1997-00867 AUTHOR: Tracy A.