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Remedial Action Plau Frontier Transportation ? June 17, 2004 Page 10 6.1) Soil Sampling !, I A total of four soil samples will be collected from each of the shallow wells and eight soil samples will be collected from the deep wells. Soil samples will be collected at Jleast at 5 ' intervals from the boring and at depths where visual or PID inspection indicates contamination. All samples will be collected in a split spoon sampler lined with 2-inch by 64nch brass tubes. The bottom brass tube will be immediately sealed with Teflon tape, capped, and packaged in a cooler with ice. The second brass tube will be field screened using a PID to detect volatile organic compounds and used to classify soil lsediments . Only those soil samples that detect petroleum hydrocarbon vapors using a PID or visual inspection will be submitted to a California certified laboratory for analysis. Soil samples from the stockpiled soil will also be collected in 2-inch by 6-inch brass tubes. All soil samples submitted to the laboratory will be analyzed for TPH-g, BTEX, _ and MTBE at a using EPA methods 8015 modified, 8020, and 8260. h6.2) Analytical Methods and Quality Assurance A California Department of Health Services certified laboratory would conduct all chemical analysis of site samples. The chosen laboratory will maintain strict l - I conformance to EPA standard methodologies, quality assurance/quality control (QA/QC) protocols and standard laboratory practices supporting EPA procedures. . J 6.3) Schedule Following acceptance of the workplan by the PHS/EHD, on site test activities - I will commence within sixty days of project cost approval by the Underground Storage Tank (UST) Fund. 7.0) FIELD DOCUMENTATION AND CHAIN-OF-CUSTODY The following sections describe the recording system for documenting all site field activities and the sample Chain-of-Custody Program. 7.1) Field Log Book An accurate chronological recording of all field activities is vital to the documentation of any environmental investigation. To accomplish this, bound and numbered field logbooks will be maintained by the field team to provide a daily record of significant events, observations, and deviations from the work plan and measurements collected during the field activities. The BEH on Site Supervisors will determine the necessity for any deviations from the work plan. The records will contain sufficient information so that the work activities can be reconstructed without relying on the ii collector's memory. All entries will be signed, dated and made with waterproof ink. Corrections to the logbook will be made by drawing one line through the error, initialing and dating. The logbook will always be stored in a secure location. I11