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AdvancedGeo <br /> 09 January 2019 Environmental <br /> AGE Project No. 99-0559 � G <br /> Page 5 of 7 <br /> 3.0. FIELD PROCEDURES <br /> All field procedures will be overseen by an AGE representative working under the <br /> supervision of a California Professional Geologist. Procedures for advancing soil <br /> borings, installation of soil vapor wells, collection and analysis of soil and soil vapor <br /> samples, boring abandonment, equipment decontamination and sample handling are <br /> presented below. <br /> 3.1. SOIL BORING ADVANCEMENT <br /> A total of seven (7) shallow soil borings for soil sampling will be advanced using a truck- <br /> mounted or van-mounted Geoprobe® 5400 direct-push probing unit equipped with 1.25- <br /> inch diameter probing rods. The probe rigs advance soil borings using a hydraulic <br /> hammer to drive sampling tools to specified depths. Borings for soil sampling will be <br /> advanced to total depths of 10 feet bsg. <br /> A total of two (2) pilot soil borings for the installation of soil vapor wells will be advanced <br /> to total depths of 6.5 feet bsg using a 4-inch diameter hand auger. <br /> 3.2. SOIL SAMPLING <br /> Soil samples will be collected for laboratory analysis from the proposed onsite soil <br /> borings. Discrete soil samples will be collected at 5 and 10 feet bsg from each boring <br /> using a 1.45-inch diameter Geoprobe soil sampling assembly loaded with a two-foot <br /> acetate liner. Upon sample retrieval, a selected portion of the liner will be separated and <br /> covered with Teflon sheets, capped and sealed with tape. <br /> Appropriately sealed and labeled samples will be placed in a chilled container under ice <br /> and transported under chain-of-custody procedure to a ELAP-certified laboratory. <br /> Samples will be analyzed for the constituents listed in Section 2.2. 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 AGE personnel in accordance <br /> with the Unified Soil Classification System (USCS). Additionally, soil samples will be <br /> field-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 /> 3.3. SOIL-VAPOR WELL INSTALLATION <br /> AGE proposes to advance a total of two (2) pilot soil borings to 6.5 feet bsg for <br /> installation of depth discrete soil-vapor wells to evaluate the potential threat of vapor <br /> intrusion, off-site to the north and south. Proposed soil borings will be advanced using a <br /> 4-inch diameter hand auger. <br />