Document npzJr1kYd4784nJbDaDb0o2Dz

IHTEROFFICE MEMORANDUM DFarte:: Dept : Tel Mo: 23-Apr-1997 02 :12pm DAVID E. ELLIS ELLISDE AT Al AT CSOC Specialty Chemicals (302) 892-7445 TO: WILLIAM E. MANCINI TO: JOHN M. MIGLIORE, P.E. ( MANCINWE AT Al AT CSOC ) ( MIGLIOJM AT Al AT CSOC ) Subject: Draft Work Plan for C-8 Bioderadation Evaluation John : Bill: Here is our working draft of the work plan to evaluate biodegradation of C-8 in the field at Washington Works. Please send us any suggestions you may have. Dave es ~sr* c z ?'3P ---- "GO) 25 --imc y KO ta ro 2N 4^ EID932572 C00048 C-8 BIODEGRADATION EVALUATION Scope of Work fc Cost Estimate DuPont Fluoroproducts April 18, 1997 Prepared By: DuPont Corporate Remediation Group Barley Mill Plaza, Building 27 P.O. Bor 80027 Wilmington, Delaware 19880-0027 EID932573 000049 R.IZ004750 1.0 IHTRODUCTIOH 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, D.A. Weber, J.M. Migliore (all DuPont Fluoroproducts) 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 EVALUATIOH 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 during the November 1991 RCRA Verification Investigation (VI) 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 Lubbeck Well Field. 3.0 SCOPE OP WORK 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 EID932574 Chooso 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 from the following wells: TW-33, Tw-2, TW-27, TW-1, TW-W-1, TW-P12, LLMW-4, LLMW-S, Ranney Well, Lubbeck 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 evironmental technicians. If these individuals are unavailable, then the sampling will be contracted to environmental technicians at Kemron Laboratories, Marietta, Ohio. (Note: Group currently conducting some site groundwater monitoring) 3.3 Temporary Well Installation fc Sampling This evaluation includes the installation and sampling of six newly installed temporary monitor wells. The wells will be located along a relatively straight line between the former anaerobic digestion ponds and the Lubbeck well field. These locations are based on the fact that Lubbeck pumping induces the groundwater system to flow directly from the ponds to the Lubbeck production wells. 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 EID932575 C00051 RJZ004752 i and Lubbeck. The temporary wells will be installed through advancing a 4.25 inner 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 ground level. (Note: Pure Gold provides an effective seal yet won't set, thus allowing easy future removal) Temporary well development will be completed immedietaly after installation using either a bailer or submersible pump. The first round of the sampling will be conducted 24 hours after development is completed. The temporary wells will be removed in the future after conclusion of the evaluation. Supervision of the temporary monitor well installation and sampling will be conducted by a DuPont CRG hydrogeologist. The temporary well installation should take approximately 3 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 approximately equivalent to a VI soil boring. The boring will be advanced to a depth of 40 feet. A 2-foot long, 2-inch diameter split spoons soil sample will be collected every 5-foot depth interval (i.e., 3-5 feet, 8-10 feet, 13-15 feet, ect.) until total depth at 40 feet is achieved. A composite soil sample for laboratory analysis will be collected from each split spoon sample. This work will be completed in conjuntion with temporary well installation 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 (for example Triton) DuPont laboratories could analyze groundwater samples for EID932576 000052 methane, nitrate, sulfate, and sulfide. In addition to these parameters, field parameters collected at the time of sampling that will aid this evaluation include: pH, specific conductivity, temperature, dissolved oxygen, and redox. The DuPont analyses will take approximately 21 days to complete. Timing of 3M's anayses is unknown. Final results 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 C8 degradation, for C7 creation, and for surfactant degardation 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 C8 mass loss per year due to biodegradation could also be made. 3.7 Evaluation S u m ary 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 Hist. Data Rev. Ext. Well Samp. Temp. Well/Soil Begin Date April 21 May 5 May 12 End Date May 2 May 7 May 16 RJZ004754 Lab Analysis Biofate Calcs. Summary Report May 19 June 17 Jume 17 June 14 June 28 July 12 5.0 COST ESTIMATE The cost estimate to conduct this evluation is $40,000. 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. $2,400 Temp Well Install/ Drilling Contr. Soil Boring $18,000 CRG Hydro. Sup. $5,500 Remove. Temp Wells Drilling Contr. $10,000* Sample Analysis 3-M No Cost Biofate Calc. Summary Report Ellis or Bio Team Ellis/Hartten No Cost $1,740 y yV5' Contingency $2,000 Total Cost: $40,000 * Please note that depth of temporary wells results in substantial removal/closure costs. Wells could be made permanent for additional $2,000 over instal. cost. *'* Please also 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. RJZ004755 EID932578 000054 6.0 PROJECT AOTHORIZATIOH 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 $40,000 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. RJZ004756 EID932579 000055