P A U L R.

Attachments to Letter to C.

ATTACHMENT TO LETTER TO C.

3MGeneral Offices 3M Center St.

ACUTE TOXICITY TO FISH (Sheepshead Minnow) TEST SUBSTANCE Identity: Perfluorooctanesulfonate; may also be referred to as PFOS or FC-95. (1-Octanesulfonic acid, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8heptadecafluoro-, potassium salt, CAS # 2795-39-3) Remarks: The test substance is a white powder.

< Larry R.

AR 2.2.6 0 6 0 6 RECEIVED n n n t UTtr <SJi> DuPont Haskell Laboratory for Toxicology and Industrial Medicine July 6,2000 Mr.

CHtl EHSR b It D I (55 IVD uy/iy `U ID: 44 N0.59 1/1 3M Specialty M aterials 3M Center SL Paul.

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A P 8.Q.G IAVST RECEIVED BPPT CBtC DuPont Fluoroproducts Chestnut Run Plaza P O.

ENCLOSURE 4 Description of the 3M Decatur Inactive Landfill Containment Structure At the 3M Decatur site, a RCRA interim remedial measures (IRM) program is currently underway to construct a containment structure for an inactive landfill.

Larry R.

REPORT Study Title ASSESSMENT OF ACUTE ORAL TOXICITY WITH T-7868 IN THE RAT (ACUTE TOXIC CLASS METHOD) Author Drs.

Toxicological Summary PFOS Dietary Chronic Pilot Reproductive Study: Northern Bobwhite Test Substance: Perfluorooctanesulfonate (PFOS) Structure: 1-Octanesulfonic acid, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8heptadecafluoro-potassium salt.

AR226-2205 i?