Ohio EPA request that DuPont address each of the comments provided below.

r H Mt _ TRADE SECRET M ZZ6 -A 23 DuPont-12991 Study Title H-25767: Static, Acute, 96-Hour Screening Test with Rainbow Trout, Oncorhynchus mykiss Authors: Barbra D.

Page 3 + DuPont's air community.

Analytical (PFOA)atday 0 results of fluorinated acid (19-Jul-2002), andday 28 (m1et6a-bAoulgi-t2e0p0e2r)fl.u.o..r. ooctanoic acid smn Table(AP-F7H.A)Aantaldyatiyca0l (r1e9s-uJlutsl-o2f0f0l2u)o,riannadteddaayc2i8d (m1e6ta-bAoulgi-t2e0p0e2r)fluorohexanoicmacidms) EMSER15-03/4842 Page dof 47 000036 DuPont EMSE Report No. 15-03 Table A-8.

AR226-3162 TRADE SECRET Study Title H-24043: Biopersistence Screening 10-Dose Oral Gavage Study in Rats Laboratory Project ID: DuPont-2932 AUTHOR; Carol Finlay, B.A.

Does not contain TSCA CBI H -24042: Biopersistence Screening 10-D ose Oral Gavage Study in Rats DuPont-2931 Supplement N o. 1 LIST OF TABLES Page 1.

Laboratory Project ID: DuPont-11671 AUTHOR: Linda A.

#R246 - 3320 52 H24768:OneGeneration Reproduction Study in Rats ARA4G - 3320 DuPont 13784 --~ : TRADE SECRET : Study Title F-24768: One-Generation Reproduction Study in Rats Volume 10f2 Laboratory Project ID: DuPont-13784 -- . | Auras: Eve Mylchreest, Ph.D.

Summary of Off-Site Sampling Program (C-8 Sampling) - Ohio One-Mile Radius Residential Sampling Summary of C-8 Analytical Results in Groundwater and Surface Water Ohio One-Mile Radius Residential Sampling Summary of Off-Site Sampling Program (C-8 Sampling) - Ohio Two-Mile Radius Residential Sampling Summary o f C-8 Analytical Results Zones A, B, and C - Ohio Two-Mile Radius Residential Sampling Monitoring Well Construction and Groundwater Elevation Data - DuPont Washington Works Facility Summary o f Analytical Results: C-8 in Groundwater - DuPont Washington Works Facility Summary o f Analytical Results: C*8 in Surface Water - DuPont Washington Works Facility Ohio River Water Sampling C-8 Results - DuPont Washington Works and Letart Landfill Outfall 005 C-8 Concentration (ug/1) - DuPont Washington Works Summary of C-8 in Groundwater - Public Water Supplies, West Virginia and Ohio - DuPont Washington Works Synoptic Groundwater Elevations, February 2002, and Well Screen Locations - DuPont Washington Works Facility W W K -08 Data Summary - text final Feb. 5 .0 3 Wilmington, D ASH021624 1IC 639856 C-8 Dato Summary Report Table of Contents Table 3.15 Table 4.0 Table 4.1 Table 4.2 .

Prior to 1991, DuPont performed C-8 analysis at the DuPont Experimental Station in Wilmington, Delaware.

DuPont-2927 eompany SwrfStea^.

DuPont-2924 Company Sanitized.

DuPont-2923 -7- Company Sanitized.

DuPont-4182 Company Sanitized.

Pursuant to Attachment A o f the Consent Order, three tasks will be performed by DuPont and evaluated by the GIST^Tasks A, B, and C.