36a 2 ADDENDUM NUMBER 1 TO THE SECOND SEMIANNUAL PROGRESS REPORT FLUOROCHEMICAL (FC) SITE RELATED ENVIRONMENTAL ASSESSMENT PROGRAM 3M COTTAGE GROVE, MN FACILITY March 2006 Prepared for 3M Company fiy WESTON SOLUTIONS, INC.

3M tipp. 3M Center St.

Jean B.

P-1 Taft/ Taft Stettinius & Hollister LLP 425 W alnut Street.

SEVERN TRENT LABORATORIES ANALYTICAL REPORT JOB NUMBER: 245781 Prepared For: Weston Solutions, Inc. 1400 Weston Way Building 5-2 West Chester, PA 19380-1499 Project: Confidential Decatur - FC Investigation Attention: Jai Kesari Date: 04/21/2006 Signature Name: Richard C.

if VsSb- V-. * 4 P R O l^ t4sa>_ M f.lt UNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON, D C. 20460 DEC - 9 2002 OFFICE OF PREVENTION; PESTICIDES AND TOXIC SUBSTANCES Dear Interested Party: eMMdo2a7xnet50hoacfd0pierlnn3uicredme,hdrmadfaeayl,1nAadgu,1lndiootuD,nutrpwsag2foeerca,0acoshcv0ale.mtkeos2muTdlyu)ruwh.blelpmegeTesloaleruefhlrtai,l9eenafisc,omssaefo2nlitunpnfh0arsitoaue0tnreerllo2dtesarl(uuols(aPre6plfneFade7pqtnAehleueFeleixxSiemnRrscpc)etelteeoscu7rcrnsohds2mhutnueea8eremibsle5mcdmp4fiuiicrcr)acsioo.oasteameplpsTslsisoyh,otitosnaiwnhoesfpesfdhotfreetdifiorhrmcneuadehDafliuliescfpenciroicugpienuntenbuailcdmoeilblhfuinlisSbbecichmseoeitagoehcrfnindroec3"tidmmas1ifnnlii,eesaegc2watnsansh0runioel0efuftilfi2easeFfcNrcee.layetectnundhwttfiroeiovenstrUr,eieaycowasleoenveRan(eiurRaSeJsotg(Naeui6ofin"lUs7entutshNeaF(phorSr)eRysyNocedfino8r1Ufa,ri1ucR0aaln1)ilcly4oys,,n tpeeEaschuoasnanetrbrpdvaltmiNiibieeeerlsnoirosisstnnposseEh-mihufrCeoiabgttdenohshmhnsenoeettsistflatpdheietlodeacorfPdoedtrcrttnourkoihloetcageniitsutshateiecmlsoncrucuutIudeionbltmoonemfmtncmtohbskmirAeetamentrekertgon,auidOetnttOlnisegaPtoi.cPvmPmnpyAaPTraeiCTowllk-llac2ye-ieob2ne0nbclfe0g0teosedt02ihmtriet2h-neeli0-maesgn0a0tec,e0t4ttwhcncr4w3oaoete3.swnnmr.ETeoiwbYmcPhnmea.eAoeeltafunlhpdoydDteaoucset.

'rom 0#mfb j Reaiy an 10/04/2001 07 C2 PM rc a: Suoject Za*><J M Ruffc< Ag/DuPontigOuPont Rooeh F P'nchot/DEV'AE/D jPont@QuPont, M Ann Brici*y'ST8/0U3<i}DUP.

GLP10-01-02; Interim Report 29 - Analysis of PFBS, PFHS, and PFOS in Groundwater Samples Collected at Off-Site Wells in Decatur, AL in March/April 2012 Study Title Analysis of Perfluorooctane Sulfonate (PFOS), Perfluorohexane Sulfonate (PFHS) and Perfluorobutane Sulfonate (PFBS) in Groundwater, Soil and Sediment for the 3M Decatur Phase 3 Site-Related Monitoring Program Data Requirement EPA TSCA Good Laboratory Practice Standards 40 CFR Part 792 Study Director Jaisimha Kesari P.E., DEE Weston Solutions, Inc. 1400 Weston Way West Chester, PA 19380 P hone:610-701-3761 Author Susan W olf 3M Environmental Laboratory Interim Report Completion Date Date of signing Performing Laboratory 3M Environmental Health and Safety Operations Environmental Laboratory 3M Center, Bldg 260-05-N-17 St.

SEVERN TRENT LABORATORIES ANALYTICAL REPORT JOB NUMBER: 238585 Prepared For: Weston Solutions, Inc. 1400 Weston Way Building 5-2 West Chester, PA 19380-1499 Project: Confidential Decatur - FC Investigation Attention: Jai Kesari Date: 07/29/2005 Signature Name: Richard C.

3(f 3M Specialty Materials 3M Center St.

m & - Ol Attachments to Letter to C.

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON, D.C. 20460 MG 8 2000 Mr.

' 3M Specialty Materials -' ORIGINAL ^ 3M Center St.

RECEIVED OPPT HCIC 2002 JAN 10 AH 8 : 3 7 I UPS OVERNIGHT DELIVERY COMPANY SANITIZED.

Iif i 3M Study Title A n a l y s is o f e n d o g e n o u s F l u o r o c h e m ic a l s in No r m a l P o o l e d H u m a n S e r u m a n d Plasma Data Requirement 40 CFR Part 792 Author Mark E.