Question 6 - Missing Use - Industrial filtration is not considered yet in the review - Public Items and References to Confidential Items Introduction PFAS primarily in use in industrial and process filtration is PTFE.

; le -- | | eae ElA seEa man | Ue el | 7 DuPont CorporapteerCiemnetnetralfor Analytical ation Sciences `EWxilmington, DeSt19880 | CertificateofAnalysis i Characterized Within a GLP Compliant Facility `MNoalmeec:ular Formula: CPHerfFluo0ro;octanoic acid, [1,2-di-"C] FormulaWeight: 416 - Dateof Synthesis: January 2, 2003 `DSEatxotpreioargafetAiCononanlDdyaisttieis:o:ns: May 2005 `cMonatyro2l0l0e7d norma room temperature Solvent (crystallization): Vertrel-XF PShtyrsuiotcuarle:Appearance: SColaidF, CoClo,r"leCsOs flakes H IPmipruitryities: 96.6% 14% Cif CO H n1d9% CiCfFRCCORHCO H | printed Name !

Ohio 0.08-0.13 Belpre, Ohio 0.06-0.1 Mason, WV 0.06-0.07 Pomeroy, Ohio 0.165 Blennerhassett 1.0-5.0 Dupont, Washington Works0 1.75-1.87 GE Plastics0 0.05-8.6 68 Private Weds WVA &Ohio 4200 3700 4800 6000 4200 1000 71 N/A N/A 68 11.760(17%) 10,360(15%) 13,440 (19%) 16,800 (24%) 11,760(17%) 2,800 (4%) 200 (0%) 2,200 (3%) 700 (1%) 190 (0%) 70,010 161 (27%) 219 (37%) 19 (3%) 45 (8%) 4 (0.7%) 1 (0.2%) 6 (1%) 90(15% ) 43(7% ) 11 (2%) 599 aAII PFOA levels were reported by their respective water dstricts and are available via the Internet.

PFOA Levels by Water District/Source and Percent of Study Subjects Reporting Water Consumption from Each Source PFOA levels3 (PPb) Location Total population* Study sample Households (% total pop) (% study sample) 1.7-4.3 Little Hocking, Ohio 0.4 -3 .9 Lubeck, WV 0.25-0.37 Tuppers Plains, Ohio 0.08-0.13 Belpre, Ohio 0.06-0.1 Mason, WV 0.06-0.07 Pomeroy, Ohio 0.165 Blennerhassett 1 .0 -5 .0 Dupont.

Please accept this letter explaining the discrepancies and isnutbosttiwtuotivnoglucomrerse,ctceadusiinnfgortmhaetiroenm.aiVnodelruomfethoefvothleumSetsepttooebeIsrseuneumBbienrdeedr.s hSaod,ttohbee split Steptoe Issue Binders should have been listed in the cover letter as follows: 3 = = B52e3 = 32 Vo`mlonuimtoerin1g- aPnldanmto/PdeerlsionngalwiAtihrinMotnheitpolarnitn-ugp set of to and documents summarizing including the fenceline; C-8 air 5 o Volumes 2-4 Air Sampling - a compilationofunderlying data for plant air sampling summarized in Volume 1; + Volumes 5-7Air Monitoring/AirModeling - a setof documents summarizing, DuPont's ait monitoring and modeling conducted outside the Washington Works facility (beyond the fenceline); Vowaltuemr esasmp8l-i9ng- fHoirsCto-r8icianlgCr-ounWdawtaetrerSathmrpoluighng-20a01se;tofdocuments summarizing the ML ago?

.: : - - . . f ^^ ^ -- - z e- Date: 19 January 1999 "" V. 1.0 MOUSE MICRONUCLEUS TEST Sponsor DuPont Specialty Chemicals, Jackson Laboratory, Chambers Works, Deepwater, NJ 08023, USA.

., +The 11 Chemours Company, 8480 DuPont Road, Washington, WV., *Corresponding Author. 12 13 Corresponding Author: John C.

<te&- w^ CONFIDENTIAL DPT478/992105 MOUSE MICRONUCLEUS TEST Sponsor DuPont Specialty Chemicals, Jackson Laboratory, Chambers Works, Deepwater, NJ 08023, USA.

AR226-2801 TRADE SECRET Study Title H-24215: Static, Acute, 96-Hour LC5o to Rainbow Trout, Oncorhynchits mykiss Laboratory Project ID: DuPont-3381 TEST GUIDELINES: U.S.

Ohio 0.08-0.13 Belpre, Ohio 0.06-0.1 Mason, WV 0.06-0.07 Pomeroy, Ohio 0.165 Blennerhassett 1.0-5.0 Dupont, Washington Works0 1.75-1.87 GE Plastics0 0.05-8.6 68 Private Weds WVA &Ohio 4200 3700 4800 6000 4200 1000 71 N/A N/A 68 11.760(17%) 10,360(15%) 13,440 (19%) 16,800 (24%) 11,760(17%) 2,800 (4%) 200 (0%) 2,200 (3%) 700 (1%) 190 (0%) 70,010 161 (27%) 219 (37%) 19 (3%) 45 (8%) 4 (0.7%) 1 (0.2%) 6 (1%) 90(15% ) 43(7% ) 11 (2%) 599 aAII PFOA levels were reported by their respective water dstricts and are available via the Internet.

Ref.

PFOA Levels by Water District/Source and Percent of Study Subjects Reporting Water Consumption from Each Source PFOA tevelsa (ppb) Location Households Total populatiorrb (% total pop) Study sample (% study sample) 1 .7-4 .3 0.4-3 .9 0 .25-0 .37 0 .08-0.13 0 .06-0.1 0.06-0 .07 0.165 1 .0-5 .0 1 -75-1 .87 0 .05-8.6 Little Hocking, Ohio Lubeck, WV Tuppers Plains, Ohio Belpre, Ohio Mason, WV Pomeroy, Ohio Blennerhassett Dupont, Washington Worksc GE Ptasticsc 68 Private Welts WVA & Ohio 4200 3700 4800 6000 4200 1000 71 N/A N/A 68 11,760 (17%) 10,360 (15%) 13,440 (19%) 16,800 (24%) 11,760 (17%) 2,800 (4%) 200 (0%) 2,200 (3%) 700 (1%) 190 (0%) 70,010 161(27%) 219(37%) 19 (3%) 45 (8%) 4 (0.7%) 1 (0.2%) 6 (1.6) 90(15%) 43(7%) 11(2%) 599 'All PFOA levels were reported by their respective water dstricts and are available via the Internet . bEstimated as 2.8 people per household.

RESEARCH DEFLUORINATION Low-temperature mineralization of perfluorocarboxylic acids Brittany Trangl t, Yuli Xiao-Song Xue4, Mohamed Ateial f, K.

RESEARCH DEFLUORINATION Low-temperature mineralization of perfluorocarboxylic acids Brittany Trangl t, Yuli Xiao-Song Xue4, Mohamed Ateial f, K.

The report issued Friday, November 16, 2001 is revised to substitute "Dupont Zonyl BA type Telomer, or Zonyl type Telomer" with Telomer.