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22 December 2020 AdvancedGeo <br /> Project No. 20-6264 AnEmployet-OwntdCompany <br /> Page 3 of 6 <br /> Laboratory reports for all analyses, testing methods, laboratory quality assurance/quality <br /> control (QA/QC) reports, and sample chain-of-custody documentation will be presented <br /> in a report with the findings and recommendations. <br /> 2.4. SOIL-VAPOR SAMPLING AND SAMPLING <br /> To evaluate subsurface impact in the clarifier and parts washer areas two borings will be <br /> advanced to a total depth of 5 feet bsg. Semi-permanent soil-vapor sampling wells will be <br /> installed and sampled following a minimum two-hour stabilization period. Procedures for <br /> installation and sampling of the proposed soil-vapor sampling wells are provided in <br /> Section 3.3. The proposed boring location is illustrated in Figure 1. <br /> 2.5. REPORT PREPARATION <br /> Upon completion of initial field work and receipt of final laboratory analysis, a report will <br /> be prepared presenting findings of the investigation. The report will be reviewed and <br /> signed by a California Professional Geologist. <br /> 3.0. FIELD PROCEDURES <br /> All field procedures will be overseen by an AGI representative working under the <br /> supervision of a California Professional Geologist. Procedures for advancing soil borings, <br /> collection and analysis of soil and groundwater samples, collection and analysis of a soil- <br /> vapor sample and equipment decontamination and sample handling are presented below. <br /> 3.1. SOIL PROBE BORING ADVANCEMENT <br /> Proposed borings for soil and groundwater sample collection will be advanced to depths <br /> of approximately 5, 10, 15 and 25 feet bsg using a hand auger and a van mounted <br /> Geoprobe 5400 direct-push probing unit or equivalent equipped with 1.25-inch probing <br /> rods. The probing unit advances soil probe borings using a hydraulic hammer to drive soil <br /> sampling tools to specified depths. <br /> 3.1.1. Soil Sampling <br /> Soil samples will be collected from the probe borings at discrete five-foot intervals <br /> beginning at five feet bsg using a 1.45-inch Geoprobe soil sampling assembly loaded with <br /> a two-foot acetate liner. Upon sample retrieval, a selected portion of the liner will be cut <br /> and covered with Teflon sheets, capped and sealed with tape. The initial five-foot sample <br /> in all boring locations will be hand packed into a 2-inch by 3-inch stainless steel liner, <br /> which will be covered with Teflon sheets, capped and sealed with tape. <br />