ADDITIONAL COMMENTS OF 3M COMPANY TO THE EPA SCIENCE ADVISORY BOARD PFOA REVIEW PANEL APRIL 18, 2005 CONTACT: JOHN L.

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ADIETARY LC30 STUDYWIPTrHoTs:HE NORTHERN BOBWHITE WILDLIFE INMTELRANABTRIEOQNUAELSLTTDN.OP:ROUJEaCT NOS 454103 Serie 8U5S0.EcElPognPeTloESfenNcu)mePro3cT5t0si2oG3n0u0Algeens (ds) FIFRA Subdivision,Scion 71.2. 0RCD Guststne 205 AUTHORS: SCTocouarmnm..eyGSBa.leClvohieesyr Reymond vin Hoven STUDY INITIATION: Apri 21, 1599 STUDYCOMPLETION: Ap26, 2r000 AMENDEDREPORTDATE:March 23,204 EnvSo3UmMBmCeMonrIploTrLaTatibTEoonDrOsory P5a3, BMuinAncae$5144 Wildlife International, Ltd.

26 November 2004 AR226-1889 To: Mary F.

Ae226-1918 --c A CHARLES RIVER COMPANY PATHOLOGY PEER REVIEWREPORT ZBWEEK CAPSULETOXICITY STUDYWITHAMMONIUM PERFLUGROOCTANGATE Co(vAaPnFcOe)SItN uCyYNNOuMmbOeLrG6U3S26M.O2N9KEYS osuEcTvE E Aeicusecopairetetsenvtnvdofatnhnatceu hesoosmosaflonHg(d0oSsTe na il1,57s5e0lecwtoesdLpornatoomtond.isTh,e iyofsrl OT ars R724 MATERIALS AND METHODS Toe sic faom aae ssaesafcoo tmsal(aOnanarlssetafvtdooOyGTrovRu)po4w, streleoctemd nGreoups1 eanirmala, anaaris re0 spuosser SR) SE Wt Ag nn 5, FEED the determination of the cause of moribundity for the Group 4 animal (105724).

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AR226-2076 3<]K?

AR226-2240 Vapor Scavenging Coefficient Estimation Vapor scavenging coefficients are used to estimate the rate of removal of a soluble species that exists below the cloud line based on rain event characteristics, such as intensity and droplet size.

AR226-2261 815D(FP/D) 815D(FP/D) SOURCE ID 647 699 614A(FEP1) 231 614A(FEP2) 232 1953(FEP3) 242 2365A (PFA) 274 2003 Production annual lb 0 4.300,000 2,700,000 2,500,000 3,903,900 3,903,900 3,346,200 1,977,000 QPU 0.0025 0.0035 0.0045 0.0051 0.0051 0.0051 0.0065 Fraction to Dryer 0,92 0.4 0.4 0.4 0.7 Scrubber Elf EMISSION RATE (Ib/yr) EMISSION RATE (G/S) 0.85 4340.1 0.0625 0.93 0.93 0.93 0.93 557.5 557.5 477.8 629.7 0.0080 0.0080 0.0069 0.0091 FCP Total 11,154,000 Split Lines 1,2,&3 as 35/35/30 Line 3 QPU raised to 0.0051 per current operations

AR226-2307 Scope and Cost of Air Dispersion Modeling Cathie Barton DuPont 03/10/03 Overview of the Scope I Can hire contractor or use in- house modeling resources Data Gathering > Modelim Interpreta of Resul 03/10/03 I Your input is critical here -vs^s^ Data Gathering Meteorological Data Terrain elevation maps Stack Parameters - Location (coordinates) - Height - Temperature - Stack gas vertical velocity - Diameter - Emission rates for each compound Plot Plan - Exact locations of all sources - Property line - Building locations and heights Modeler typi gets this information you 03/10/03 Standard Model and Methodo EPA's preferred model: Industrial Sou Complex Short Term 3 (ISCST3) Mode Procedures detailed in EPA's Guidelin Air Quality Models (40 CFR 51 Append http://www.epa.gov/scram001/guidanc de/appw_01.pdf 03/10/03 Modeling Output Model will calculate hourly concentra in ug/m3 across a study area (5 km x km for example) Model will average those concentrati over a designated time period (24 ho monthly, yearly) Concentration contours showed exte different ug/m3 Also shows numerical values (top 10 the study area and locations) 03/10/03 Technicolor Example of Outp 2480000-H 247BOOO 2476000-1 W1000-\ 2472000H 2-170000-^ 2468000-1 2466000-'- 608000 610000 612000 614000 616000 618000 620000 62200 Interpretation of Results Compare maximum averaged concentration to appropriate "thres value - Maximum annual average would be compared to a chronic toxicity value - Maximum hourly average would be compared to an acute toxicity value 03/10/03 Cost and Timing Expect about 50 man-hours (_10 h Costs - Outside modeler charges approximate $150/hr - Meteorological data could be up to $1 - Estimate around $8,500 for an averag 03/10/03

AR226-2321 / Ann K Masse 04/02/2003 06:15 PM To: cc: Subject: John W MilroyJII/DDE/DuPont@DuPont, Stephen R Hastings/DDE/DuPont@DuPont, Edward J Lukosius/AE/DuPont@DuPont, Gregory P Shankwitz/CL/DuPont@DuPont Catherine A Barton/AE/DuPont@DuPont, Charles J Zarzecki/AE/DuPont@DuPont Data for air dispersion modeling Folks, Please provide the requested data lo Cathy Barton (see attached e-mail) for the DDE process (Kalrez) and the DFS process by 4/11.

AR226-2627 15 AR226-2627 RESULTS OF C8 SAHPLES PROM Dg'IH J993 5BOmro QATES SAMPLES ON THE SITE, Sample poinc C8 ia ppb ^fT-^^ -^/-2/ (r3 A B ff6 A B C D ?

AR226-2635 23 AR226-2635 AIR QUALITY DISPERSION MODELING ANALYSIS OF C8 EMISSIONS DuPont Fayetteville, North Carolina Facility Prepared by: Charles J.

AR226-2701 23 AR226-2701 TORONTO WORKSHOP MATERIALS September 13-14,2004 Measuring Physical Chemical Propertie & Analytical Mar/A.