Document g2jYaGgJzq7ebgJQjyzygLbN9

"Rogar J. Zipfel" < Z IPFEL@WWPS-A1.EMAIL.DUPONT.COM > on 09/14-/99 0 4:53 :2 3 PM To: Roger J Zipfel/AE/DuPont cc: Subject: (C-8 BIODEGRADATION/14-May-1997)1 /Estimate for C8 Study at WW Date: Wed, 14 May 1997 07:34:00 EDT Prom: "JOHN M. MIGLIORE" <MIGLIOJMgCSOC-Al.EMAIL.DUPONT.COM> Subject: 1/Estimate for C8 Study at WW To: "Robert R. Mattson" <MATTSORR@wwps-al.email.dupont.com>, "Robert L. Ritchey" <RITCHERL@wwps-al.email.dupont.com>, GREGORY A CHAPMAN <CHAPMAGA@wwps-al.email.dupont.com>, "Roger J. Zipfel" < ZIPFEL@wwps-al.email.dupont.com> . MIME-version: 1.0 Content-type: MULTIPART/MIXED; BOUNDARY="Boundary_(ID_hXoetKosBO+ZeSKUsxdHTw)" Delivery-date: Wed, 14 May 1997 08:08:00 EDT Posting-date: Wed, 14 May 1997 07:40:00 EDT Importance: normal Al-type: MAIL Gentlemen, Please be informed that I plan to discuss the attached proposal at our C8 meeting tomorrow. I will add it as the last item of the agenda so those not wishing to participate can leave. Thanks, John Date: Tue, 13 May 1997 15:13:00 EDT From: "ANDREW S. HARTTEN" <HARTTEAS@CSOC-Al.EMAIL.DUPONT.COM> Subject: REVISED C-8 SCOPE To: "JOHN M. MIGLIORE, P.E." <MIGLIOJM@CSOC-Al.EMAIL.DUPONT.COM> MIME-version: 1.0 Content-type: text/plain Posting-date: Tue, 13 May 1997 15:39:00 EDT Importance: normal Al-type: MAIL nfCi2or3* "frrn 73 c t> -- 5P7 VJ3 PO John, Attached is the revised scope I promised this morning. You'll notice some changes that reflect comments in Roger Zipfel's * EID937939 C00058 summary on the 4/24 meeting with 3-M. If you have any questions regarding possible funding from CRG sources, or other DuPont sources, please contact Bill Mancini to discuss. Please give me a call at 992-6820 if you have any questions. Andrew Date: Wed, 16 Apr 1997 13:31:00 EDT MIME-version: 1.0 Content-type: text/plain Posting-date: Tue, 13 May 1997 00:00:00 EDT Importance: normal Al-type: DOCUMENT C-8 BIODEGRADATION EVALUATION Scope of Work fi Cost Estimate DuPont Fluoroproducts May 13, 1997 C00059 Prepared By DuPont Corporate Remediation Group Barley Mill Plaza, Building 27 P.O. Box 80027 Wilmington, Delaware 19880-0027 I. 0 INTRODUCTION At the request of DuPont Fluoroproducts, the DuPont Corporate Remediation Group (CRG) has prepared herein a scope of work and cost estimate to conduct a C-8 Biodegradation Evaluation at the DuPont Washington Works facility. The scope of work (i.e., work plan) presented is based on an evaluation outline prepared February 27, 1997 by R.J. Zipfel, J. M. Migliore (DuPont Fluoroproducts), D.A. Weber (DuPont Engineering Polymers) and D.E. Ellis (DuPont CRG). This evaluation will be conducted by DuPont Washington Works and CRG personnel in combination with contract drilling services. 2.0 EVALUATION OBJECTIVES This C-8 Biodegradation Evaluation is being conducted to determine if C-8 (i.e., ammonium perfluoro-octanoate) will naturally biodegrade within the facility's unsaturated and saturated soils. The evaluation will focus on facility areas such as the former anaerobic digestion ponds which have formerly displayed high soil C-8 concentrations, the resulting C-8 groundwater contamination plume in the underlying site aquifer, and the primary groundwater discharge location at the Lubbeck Well Field, where C-8 (in groundwater) has historically been detected. Soils beneath the former anaerobic digestion ponds will be sampled and analyzed for C-8 and its potential biodegradation products (i.e., C-7). These results will be compared to results collected at the same location as documented in the April 1992 Verification Investigation (VI) report to determine if concentration decreases have occurred, and whether biodegradation products are present. C-8 biodegradation in groundwater will be evaluated through the sampling of existing and temporary monitor wells installed along the primary groundwater migration pathway between the anaerobic digestion ponds and the Lubeck Well Field. 3.0 SCOPE OF WORK C00960 This evaluation will include completion of the following key tasks: * Historical data review * Existing monitor well sampling * Temporary well installation & sampling * Soil sampling * Sample analysis * Biofate calculations * Evaluation summary report & recommendations Each of these tasks is discussed in the following sections. 3.1 Historical Data Review This task will include a review of historical C-8 analytical data (i.e., VI report and other sources) from the following wells: TW-33, Tw-2, TW-27, TW-1, TW-W-1, TW-P12, LLMW-4, LLMW-6, Ranney Well, Lubeck Well This data will help establish baseline C-8 concentrations and distribution in the site aquifer. In addition, this data review will help focus the scope of the sampling event being conducted for this evaluation. This task will be completed by D.E. Ellis and A.S. Hartten, DuPont CRG. 3.2 Existing Monitor Well sampling This task will include sampling of existing monitor wells located within our near the evaluation area. At this time, the wells selected for sampling include: TW-33, TW-2, TW-27, TW-M-4, TW-W-1, TW-P12 This list may change based on results from Task 3.1 or other reasons such as accessibility or current condition. Laboratory analysis will be conducted by 3M. The sample analytical parameters are discussed in Section 3.5. The sampling will be conducted by Washington Works personnel. *. 3.3 Monitor Well Installation Si Sampling This evaluation includes the installation and sampling of six newly installed monitor wells. The wells will be located along the primary groundwater flow pathway between the former anaerobic digestion ponds and the Lubeck well field. These locations are based on the fact that Lubeck pumping induces the groundwater system to primarily flow directly from the ponds to the Lubeck production wells {Note: There is likely a small component of flow from the ponds toward the Ranney well). Hence, this portion of the site aquifer is established as the primary C-8 migration pathway. C-8 and degradation product concentrations in these wells will be evaluated to determine the groundwater attenuation processes occurring in the aquifer between the anaerobic digestion ponds and Lubeck. The monitor wells will be installed through advancing a 4.25 inner diameter (8-inch outter diameter) hollow stem auger through the unsaturated soils approximately 10 feet into the water table (estimated depth 70 feet). A 5-foot long, 2-inch diameter Schedule 40,,20 slot PVC well screen with sufficient length riser pipe will be installed at the auger total depth. A silica sand pack will be installed in the well screen annular space to a depth 5 feet above the top of the screen. The remaining annular space will be filled with Pure Gold sodium bentonite grout to 2 feet below ground level. The final 2 feet will be filled with concrete during construction of the final well head. The final well head will include an outter 4-inch steel protective casing surrounding the PVR riser stick-up and a 3.5-foot diameter (RCRA guidance size) concrete pad that slightly slopes away from the casing to prevent water pooling. Monitor well development will be completed immedietaly after installation using either a stainless steel bailer or stainless steel submersible pump. The first round of the sampling will be conducted 24 hours after development is completed. Supervision of the monitor well installation and sampling will be conducted by a DuPont CRG hydrogeologist. The well installation/sampling should take approximately 5 days. 3.4 Soil Sampling This task includes completion of a single hollow stem auger soil boring in the former anaerobic digestion pond area. The soil boring will be drilled at a location within 5-feet of a VI soil boring and will be advanced to a depth of 40 feet. At the request of 3-M, continuous 3-foot long, 3-inch diameter, aluminum (standard material used), shelby tube soil samples will be advanced (i.e., hydraulically pushed) ahead of the auger bit. Upon recovery, the shelby tube will immediately be sealed with paraffin wax and aluminum foil, and then placed on ice in a cooler. This drilling/sampling method will continue until total depth at 40 feet is achieved. Upon completion of the soil boring, a EID937943 permanent monitor well (one of the 6 total) will be installed in the borehole. Roger Zipfel will have overall responsibility for the well drilling activity and will obtain necessary plant permits far excavation/drilling activities. 3.5 Sample Analysis The groundwater and soil samples will be analyzed by 3-M Corporation using analytical methods specifically developed for this evaluation. The analysis will include the following parameters: C-8 C-7 Surfactants (e.g., Triton) If addition, the site laboratory will be requested to run several biological indicator analysis (i.e., methane, nitrate, sulfate, and sulfide). Field parameters collected at the time of sampling that will aid this evaluation include: pH, specific conductivity, temperature, dissolved oxygen, and REDOX. The 3-M analysis will take approximately 45 days to complete. Final resulsts will be forwarded to DuPont CRG for use in biofate calculations and other data analysis. - 3.6 Biofate Caculations Biofate calculations will be completed upon receipt of 3-M laboratory analytical data results. This task will consist of estimating the rate constants for C-8 degradation, for C-7 creation, and for surfactant degradation vs. distance along the flow paths to be studied. Both graphical estimation and curve plotting methods will be used. Hydrogeological estimates of dilution, dispersion, and retardation will be used to correct these rate constant estimates for matrix effects. If the field and analytical data quality is high, a rough estimate of C-8 mass loss per year due to biodegradation could also be made. 3.7 Evaluation Summary Report A final evaluation summary report detailing evaluation methods, results, conclusions, and recommendations will be prepared and submitted to DuPont Fluoroproducts. 4.0 SCHEDULE The start schedule for the field related evaluation tasks are contingent on 3-M's final development of the C-8, C-7 analytical procedures. Task 3.1 can begin immediately after project approval. A tentative schedule for this evaluation is provided below: Task Begin Date End Date Hist. Data Rev. May 19 May 30 Ext. Well Samp. May 27 June 7 Monitor Well/Soil June 2 June 7 Lab Analysis June 7 July 22 Biofate Calcs. July 22 August 2 Summary Report July 22 August 9 Note: Schedule subject to change based on project authorization date. 5.0 COST ESTIMATE The cost estimate to conduct this evluation is $29,600. the cost detail as related to specific evaluation tasks is provided below. Task Resource Cost Hist. Data Rev. Ellis/Hartten $360 Exist. Well Samp. Plant Tech. No Cost Well Install/ Drilling Contr. Soil Boring $19,000 CRG Hyd. Support $6,500 Sample Analysis 3-M Biofate Calc. Ellis or Bio Team Summary Report Ellis/Hartten Contingency No Cost No Cost $1,740 $2 , 0 0 0 EID93794S CC0064 Total Cost: $29,600 ** Please note these costs do not include any waste management costs (i.e., drill cuttings, ect.) as it is assumed that the facility can manage any wastes. 6.0 PROJECT AUTHORIZATION The DuPont Corporate Remediation Group is hereby authorized to procede with implementation of the C-8 Biodegradation Evaluation as defined in the attached scope of work. The project budget of $29,600 will not be exceeded without my authorization. Name (Sig.) Date Charge Code * Please fax this page to Andrew S. Hartten at 302-892-7643 to initiate project. E3D937946 . C0G065