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-' J Work Plan <br /> Frontier Transportation <br /> July 23, 2001 <br /> A filter pack of sand will be placed around the screen to retain the finer grained fractions <br /> - of formation material and to create a zone of high permeability that allows free entry of water in <br /> the well. The pack will consist of clean quartz sand (Monterey #3) . The bentonite and annular <br /> seals are necessary to prevent the annulus from serving as a vertical conduit for potential <br /> -, contaminants. Following placement of the annular seal, a large-diameter flush-mount protective <br /> ' casing will be installed around the well head. The casing will be firmly seated in concrete and <br /> supplied with lockable covers for security. <br /> 6.1) Soil Sampling <br /> Soil samples will be collected at least at 5 ' intervals from the boring and at depths <br /> where visual or PID inspection indicates contamination. All samples will be collected in a split <br /> spoon sampler lined with 2-inch by 6-inch brass tubes. The bottom brass tube will be <br /> immediately sealed with Teflon tape, capped, and packaged in a cooler with ice. The second <br /> brass tube will be field screened using a PID to detect volatile organic compounds and used to <br /> classify soil sediments. Only those soil samples that detect petroleum hydrocarbon vapors using <br /> a PID or visual inspection will be submitted to a California certified laboratory for analysis. Soil <br /> samples from the excavation pit and stockpiled soil will also be collected in 2-inch by 6-inch <br /> brass tubes. All soil samples submitted to the laboratory will be analyzed for TPH-g, BTEX, and <br /> MTBE at a using EPA methods 8015 modified, 8020, and 8260. <br /> 6.2) Analytical Methods and Quality Assurance <br /> A California Department of Health Services certified laboratory would conduct <br /> all chemical analysis of site samples. The chosen laboratory will maintain strict conformance to <br /> EPA standard methodologies, quality assurance/quality control (QA/QC) protocols and standard <br /> laboratory practices supporting EPA procedures. <br /> : I 6.3) Schedule <br /> Following acceptance of the work plan by the PHS/EHD, on site test activities <br /> will commence within sixty days of project cost approval by the Underground Storage Tank <br /> (UST) Fund. <br /> 7.0) FIELD DOCUMENTATION AND CHAIN-OF-CUSTODY <br /> The following sections describe the recording system for documenting all site field <br /> activities and the sample Chain-of-Custody Program. <br /> 4 <br /> _i <br />