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Stantec <br /> June 16,2010 <br /> Page 3 of 4 <br /> RE: Notification of Action -Soil Vapor Extraction Pilot Testing <br /> SVE Pilot Testing <br /> Stantec will provide direct oversight for the SVE pilot test. The test will generally consist of the following: <br /> • Mobilization of equipment to the Site including a trailer mounted SVE blower, thermal destruction unit, <br /> propane fired generator, temporary propane tank, and knockout tank for use in the testing program; <br /> • Conducting a SVE pilot test for up to 96 continuous hours, generally assumed to occur between <br /> Monday and Friday afternoon (i.e., mobilization and setup will occur Monday morning, and the unit <br /> will be started Monday afternoon to be picked up before the end of the day on Friday); and <br /> • Daily data collection during pilot test including: <br /> o Rate of vapor removal in standard cubic feet per minute(SCFM); <br /> o Vacuum at the test well head in inches of mercury(Hg); <br /> o Vacuum at nearby observation point locations in inches of Hg; <br /> o PID readings for influent to and effluent from the treatment unit(s); and, <br /> o Collection of daily untreated and treated vapor samples for laboratory analysis. <br /> • Disconnection of the equipment from the test well, and demobilization from the Site. <br /> Vapor Sample Analysis and Chain-of-Custody Procedures <br /> Untreated and treated vapor samples will be collected from the system prior to influent reaching the vapor <br /> carbon units. Samples will be labeled with the sample identification and submitted to the laboratory for <br /> chemical analysis of toxic organic compounds by Environmental Protection Agency(EPA) Method TO-14. <br /> Individuals responsible for handling/shipping and receiving samples will sign the chain-of-custody with the <br /> date and time that the samples were relinquished. <br /> Waste Handling <br /> Investigation derived waste generated during the SVE pilot test activities (soil cuttings during well installation, <br /> equipment decontamination liquids, liquids collected in the knock out tank) will be stored in appropriately <br /> labeled 55-gallons drums on the PG&E property. The drums will remain on-site until all SVE pilot test <br /> activities have been completed, or transferred from the Site to an appropriate staging facility managed by <br /> PG&E. Waste will be sampled prior to disposal. The analytical results will be used for waste profiling and <br /> disposal evaluation by PG&E. <br /> Task 3—REPORTING <br /> Stantec will evaluate the data collected under Task 2, and prepare a technical report of findings and <br /> recommendations. The report will include a recommendation as to whether or not the technology should be <br /> further considered for full-scale implementation to reduce contaminant concentrations in the tank area prior to <br /> excavation. Of primary consideration will be the observed radius of influence, and the estimated mass of <br /> contaminants removed and treated on a daily basis. We anticipate the report will be submitted to the DTSC <br /> within 60 days of completion of the test. The test is scheduled to occur in the 3rd Quarter 2010, pending <br /> concurrence by the DTSC for this NOA. <br /> 1:1PG&E1Lodi MGPISVE Pilot Test1NOA Letter FNL-06 16 10.doc <br />