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11 September 2020 AGE Project No. 20-6107 Page 3 of 6 Advanced Environmental installation and sampling of the proposed soil -vapor sampling wells are provided in Section 3.3. Proposed boring locations are illustrated in Figure 1. 2.5. REPORT PREPARATION Upon completion of initial field work and receipt of final laboratory analysis, a report will be prepared presenting findings of the investigation. The report will be reviewed and signed by a California Professional Geologist. 3.0. FIELD PROCEDURES All field procedures will be overseen by an AGI representative working under the supervision of a California Professional Geologist. Procedures for advancing soil borings, collection and analysis of soil and groundwater samples, equipment decontamination and sample handling are presented below. 3.1. SOIL PROBE BORING ADVANCEMENT Proposed borings for soil and groundwater sample collection will be advanced to depths of approximately 10 to 15 feet bsg using a van mounted Geoprobe 5400 direct -push probing unit or equivalent equipped with 1.25 -inch probing rods. The probing unit advances soil probe borings using a hydraulic hammer to drive soil sampling tools to specified depths. 3.1.1. Soil Sampling Soil samples will be collected from the probe borings at discrete five-foot intervals beginning at five feet bsg using a 1.45 -inch Geoprobe soil sampling assembly loaded with a two -foot acetate liner. Upon sample retrieval, a selected portion of the liner will be cut and covered with Teflon sheets, capped and sealed with tape. The initial five-foot sample in all boring locations will be hand packed into a 2 -inch by 3 -inch stainless steel liner, which will be covered with Teflon sheets, capped and sealed with tape. Appropriately sealed and labeled samples will be placed in a chilled container under ice and transported under chain -of -custody procedure to an ELAP-certified laboratory. Samples will be analyzed for the constituents listed in Section 2.3. Each sample will be labeled with boring designation, depth, time, date and sampler's initials. Soils encountered in the borings will be visually classified by AGI personnel in accordance with the Unified Soil Classification System (USCS). Additionally, soil samples will be field - screened for presence of volatile organic compounds using an organic vapor meter (OVM), equipped with photo -ionization detector (PID) pre -calibrated to isobutylene.