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09 November 2021 <br />Project No. 21-6640 <br />Page 3 of 5 <br /> <br />sampling of the proposed soil-vapor sampling wells are provided in Section 3.1.2. The <br />proposed boring locations are illustrated in Figure 1. <br /> <br /> <br />2.5. REPORT PREPARATION <br /> <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 /> <br /> <br />3.0. FIELD PROCEDURES <br /> <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 samples, collection and analysis of a soil-vapor sample and <br />equipment decontamination and sample handling are presented below. <br /> <br /> <br />3.1. SOIL PROBE BORING ADVANCEMENT <br /> <br />Proposed borings for soil sample collection will be advanced to depths of approximately <br />15 feet bsg using a hand auger and a truck-mounted Geoprobe 5400 direct-push probing <br />unit or equivalent equipped with 1.25-inch probing rods. The probing unit advances soil <br />probe borings using a hydraulic hammer to drive soil sampling tools to specified depths. <br /> <br /> <br />3.1.1. Soil Sampling <br /> <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 /> <br />Appropriately sealed and labeled samples will be placed in a chilled container under ice <br />and transported under chain-of-custody procedure to an ELAP-certified laboratory. <br />Samples will be analyzed for the constituents listed in Section 2.3. Each sample will be <br />labeled with boring designation, depth, time, date, and sampler's initials. Soils <br />encountered in the borings will be visually classified by AGI personnel in accordance with <br />the Unified Soil Classification System (USCS). Additionally, soil samples will be field- <br />screened for presence of volatile organic compounds using an organic vapor meter <br />(OVM), equipped with photo-ionization detector (PID) pre-calibrated to isobutylene. <br />