>*224-/SO P rsn 8ema/d - on 10/04/2001 08 26 AM cc SvOiect rhjrru^jtPv'fcncorp com swashburn@envtrencorD com M Am 8'<H*v.'

-2- Absorption of FC-l43-*^C In Rets After e Single Orel Dose December 28, J979 WC/*\ JAN 17 1980 Conducted et: During: Conducted by: Report by: Reviewed by: Rlker Leboretories, Inc.

Aft.1160521 ACUTE TOXICITY TO AQUATIC INVERTABRATES (DAPHNIA MAGNA) TEST SUBSTANCE________________________________________________ Identity: Perfluorooctanoic acid, ammonium salt; may also be referred to as PFOA ammonium salt, Ammonium perfluorooctanoate, PFO, FC116, FC-126, FC-169, FC-143 or as the major component of FC1015.

CAS Number 754-91-6 3M Company M 6_T77 Voluntary Use and Exposure Information Profile Perfluorooctane sulfonamide I.

' CAS Number 31506-32-8 3M Company AfLAaeJ^I Voluntary Use and Exposure Information Profile N-Methyl perfluorooctanesulfonamide I.

"Rogar J.

Atm,-m i INTEROFFICE MEMORANDUM Date: From: Dept: Tel No: 08-Apr-1998 02:34pm DAVID E.

3M General Offices 3M Center St.

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AR226-1969 Fine ^ujeLer D ryer O perator1* 3 > e sk - ' / */ p p b !

AR226-2039 INTEROFFICE MEMORANDUM Date: 21-Sep-1998 12:30pm EDT From: JACK OFFENBERGER .

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AR226-2392 \ V y- Du Pon t I N T E R O F F I C E MEMORANDUM Dates From* Dept s T el No 12-May-1987 03s06pm EST TONY PLAYTIS PLAYTIS TEFTECH 2775 T O s ROGER ZIPFEL ( ZIPFEL ) CCs JOHN CRUM ( CRUM ) Subjects C8 In Water A t t ached is a copy of the analytical report for our five water samples, which are identified as follows

AR226-2554 Robert F Pinchot 04/24/2000 09:31 PM To: cc: Subject: Gary w Kennedy/AH/DuPont@DuPont, Susan S Mileti/DuPont@DuPont, Michael E McCord/AE/DuPont@DuPont, Robert 0 Buck/DuPont@DuPont, Diane R Shomper/AE/DuPont@DuPont, Hugh J Campbell_Jr/AE/DuPont@DuPont, Bernard J Reilly/AE/DuPontffiDuPont, Andrew S Hartten/AE/DuPont@DuPont, Isidoros J Zanikos/AE/DuPont@DuPont Maurice Astorga/AE/DuPont@DuPont Notes from our meeting last week Attached are the notes from our meeting last week.

RECYCLED I */ AR226-2654 AR226-2654 ISC Modeling Methodology and Results Introduction This report summarizes dispersion modeling that was completed for the DuPont Washington Works facility to demonstrate that the emission limits included in Permit Application 2365D for the PFA(Cl-P) operation complies with the C-8 assessment of toxicity (CAT) recommended airborne screening level o f 1.0 ug/m3 at the property line fence.