AR226-2041 To: Partick J Cavanagh/Cl/DuPont@ DuPont cc: Roger J Zipfel/AE/DuPont@ DuPont S u b ject 6/9/99 C -8 Sam pling Pat, Samples were taken today from 1:30 PM to 6:00 PM in the following locations: inside the C-8 recovery building inside the C-8 recovery building control room recovery building roof smoking area roof area outside lunchroom The wind conditions were 3-5 mph out of the north at the start of sampling and out of the south/east at the end of sampling.

MScoodpeeliannad Cost of Air Dispersion Cathie Barton DuPont 03/10/03 AR226- Overview of the Scope Can hire contractor or use inhouse modeling resources GaDthaetraing Modeling InotefrRpreestualttison Ycoriutircianlphuetreis 03/10/03 Data Gathering Meteorological Data * Terrain elevation maps Stack Parameters - Location (coordinates) Minofdoegrlemeytrsaotttuyihopinsicfaolrly - 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 EID 719401 03/10/03 Standard Model and Methodology EPA's preferred model: Industrial Source Complex Short Term 3 (ISCST3) Model Procedures detailed in EPA's Guideline on Air Quality Models (40 CFR 51 Appendix W) http://www.epa.gov/scram001/guidance/gui de/appw_01.pdf M H 03/ 10/03 Modeling Output Model will calculate hourly concentrations in ug/m3 across a study area (5 km x 5 km for example) Model will average those concentrations over a designated time period (24 hour, monthly, yearly) Concentration contours showed extent of different ug/m3 Also shows numerical values (top 10 in the study area and locations) 03/ 10/03 Technicolor Example of Output WcGnO EID 719404 r_ Interpretation of Results Compare maximum averaged concentration to appropriate "threshold" value - Maximum annual average would be compared to a chronic toxicity value - Maximum hourly average would be compared to an acute toxicity value P O Oo wcn 03/10/03 to EX D 719405 Cost and Timing Expect about 50 man-hours (_10 hours) Costs - Outside modeler charges approximately $150/hr - Meteorological data could be up to $1,000' - Estimate around $8,500 for an average job. o o owcn 03/10/03 o EID 719406

AR226-2588 "Andrew > Martien l0//1B/UU2 4:1 HW To: stvs.williams@epa.etata,oh.us cc: Bernard J Reilly/AE/DuPont@DuPoM, Laura R Walter/AE/DuPont@DuPont, M.

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Msne _zil8 o d 22 000216 finale,- w e ANALYTICAL RESULTS: POLYMER PRODUCTS - IN BLOOD WORKS Production Building Operators Building Mechanic July-August 1981 First Technicians Line Solution Emulsion Supervision Prep** __ f e g -- Method Development Technician 0.014 0.062 0.077 0.140 0.150 0.025 0.084 0.110 0.039 0.027 0.250 0.150 0.059 as ppm)Fluorine in Blood 0.013 0.016 N.i). 0,032 0.015 0.033 0.013 ( 0,015 ) 0.007 ( 0,007 ) 0.011 ( 0.016 ) 0.020 N.D. <0.007 <0.007 Q.0 1 0 0.096 ( 0.120 ) N.D. 0.014 0,250 0.094 0.059 0.059 0 0,033 0.018 0,007 0.120 0.036 0 0.020 0.009 Low 0 High 0 Mean Overall Range: 0-0.250, Overall Mean: 0.049 *Ammoniura Perfluorooctanoate **Duplicate numbers reported for four individuals.

INTERIM REPORT # 8 - Analysis of Sediment Samples STUDY TITLE Analysis of Perfluorobutanesulfonate (PFBS), Perfluorohexanesulfonate (PFHS), and Perfluorooctanesulfonate (PFOS) in Water, Soil, Sediment, Fish, Clams, Vegetation, Small Mammal Liver and Small Mammal Serum Using LC/MS/MS for the 3M Decatur Monitoring Program DATA REQUIREMENTS EPA TSCA Good Laboratory Practice Standards 40 CFR 792 STUDY DIRECTOR Jaisimha Kesari P.E., DEE Weston Solutions, Inc. 1400 Weston Way West Chester, PA 19380 ' Phone: 610-701-3761 INTERIM REPORT COMPLETION DATE 07/13/06 PERFORMING LABORATORY Exygen Research 3058 Research Drive State College, PA 16801 Phone: 814-272-1039 STUDY SPONSOR 3M Company 3M Building 0236-01-B-10 St.

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Electronically Served 9/22/2017 10:33 PM Hennepin County, MN 27-CV-10-28862 Filed in Fourth Judicial District Court 11/17/2017 7:31 PM Hennepin County, MN STATE OF MINNESOTA DISTRICT COURT FOR THE COUNTY OF HENNEPIN FOURTH JUDICIAL DISTRICT CIVIL ACTION NO. 27-CV-10-28862 STATE OF MINNESOTA, et al. v. 3M COMPANY EXPERT REPORT OF PHILIPPE GRANDJEAN, MD, DMSc PREPARED ON BEHALF OF PLAINTIFF STATE OF MINNESOTA 22 September, 2017 CONFIDENTIAL - SUBJECT TO A PROTECTIVE ORDER ENTERED IN HENNEPIN COUNTY DISTRICT COURT, NO. 27-CV-10-28862 27-CV-10-28862 Filed in Fourth Judicial District Court 11/17/2017 7:31 PM Hennepin County, MN Based on the available evidence, PFCs are convincingly associated with endocrine disrupting effects that may have substantial impacts on vulnerable population groups.

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Annex A - Table A.49.