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Description ENCLOSURE 4 of the 3M Decatur Inactive Landfill Containment z2s z-u Structug -4 2"x "13x3rx;-j --3-,~(;.--` ".".

BACK TO MAIN ACTIVATED SLUDGE RESPIRATION INHIBITION TEST TEST SUBSTANCE Identity: Potassium Decafluoro(pentafluoroethyl)cyclohexanesulfonate may also be referred to as FC-98.

BACK TO MAIN SOIL ADSORPTION (METHOD DEVELOPMENT) TEST SUBSTANCE Identity: Perfluorooctanoic acid, ammonium salt; may also be referred to as PFOA ammonium salt, Ammonium perfluorooctanoate, PFO, FC-116, FC-126, FC-169, or FC-143.

BACK TO MAIN Study Title Characterization Studyof PFOA (lot #332), Primary Standard - Test Control Reference #TCR-99030-030 PHASE: SOLUBILITY DETERMINATION Data Requirement 40 CFR 160.105(b) Author Mark E.

PFOS EcotoxicologicalTesting Results Comparison of Effect Concentrations Calculated Using Different Sample Purity All values calculatedas mean measuredconcentrationse, xceptwhere* (nominal).

NORTHERN KENTUCKY OFFICE SUITE 340 1717 DIXIE HIGHWAY COVINGTON, KENTUCKY 41011-4704 606-331-2838 513-381-2838 FAX: 513-381-6613 DAYTON, OHIO OFFICE SUITE 900 110 NORTH MAIN STREET DAYTON, OHIO 45402-1786 937-228-2838 FAX: 937-228-2816 ROBERT A.

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AR226-2194 ^ Stephen J Gissy 08/28/2001 07:33 AM To: cc: Subject: Ta-Wei Fu/SE/DuPont@DuPont Oscar T Garza/AE/DuPont@DuPont, Fred M Lentz/SE/DuPont@DuPont, Robbin Baneriee/AE/DuPontQDuPont, Paul K.

AR226-2222 Stack Parameters Permit Number 1823A 815D 815D 1353A Pre-Existing 614A 614A 781 1953 2365A Semi-works Application Semiworks Application Scmiworks Application Semiworks Application Venl ID T6IZCE consists of 18 one-fool diameter verus.

AR226-2301 ^ Charles J Zarzecki 02/21/2003 01:43 PM To: cc: Subject: Catherine A Barton/AE/DuPont Snapshot Results Cathie, The snapshot resuts: 0.477 ug/m3 at the same property line receptor as before.

AR226-2365 Manage Existing C-8 Products and Processes The meeting will be held at 8:00 am on April 2, 1998 in CBP 702-1242 (contact is Pinchot) with an audio connection/to MM (B21 Downstairs Small CR % 883-3615, contact is Chapman) and Rik Brandenburg at OH (947-1648).