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02 July 2019 AdvancedGeo <br /> AGE Project No. 19-4793 E n v i ro n m e n t a l <br /> Page 3 of 3 <br /> 3.0. FIELD PROCEDURES <br /> All field procedures will be overseen by an AGE representative under the supervision of <br /> a California Professional Geologist. Procedures for the advancement of the soil borings <br /> and sampling are outlined below. <br /> 3.1. SOIL BORING ADVANCEMENT AND SOIL SAMPLING <br /> Soil borings will be advanced using a van mounted Geoprobe 5400 direct-push probing <br /> unit equipped with 1.25-inch probing rods. The Geoprobe advances soil probe borings <br /> using a hydraulic hammer to drive soil and groundwater sampling tools to specified <br /> depths. Soil samples will be collected at discrete five-foot intervals at five and ten feet <br /> bsg and between five and twenty feet bsg using a 1.25-inch Geoprobe soil sampling <br /> assembly loaded with a two-foot acetate liner. <br /> For sample collection, a selected portion of the liner will be cut and covered with Teflon <br /> sheets, capped and sealed with tape. Appropriately sealed and labeled samples will be <br /> placed in a chilled container under ice and transported under chain-of-custody <br /> procedure to a CELAP-certified laboratory. Samples will be analyzed for the <br /> constituents listed in Section 2.2. Each sample will be labeled with boring designation, <br /> depth, time, date and sampler's initials. Soils encountered in the boring will be visually <br /> classified by AGE personnel in accordance with the Unified Soil Classification System <br /> (USCS). Additionally, soil samples will be field-screened for presence of volatile organic <br /> compounds using an organic vapor meter (OVM), equipped with a photo-ionization <br /> detector (PID) pre-calibrated to isobutylene. <br /> 3.2. EQUIPMENT DECONTAMINATION <br /> All non-disposable sampling equipment will be triple-rinsed in a solution of Alconox prior <br /> to advancement of each boring. Rinseate generated during drilling activities will be <br /> containerized in properly labeled Department of Transportation (DOT)-approved 55- <br /> gallon drums and stored on-site in an area lacking public access. Disposal alternatives <br /> will be evaluated at a later date based on laboratory results. <br /> 3.3. BORING ABANDONMENTS <br /> Following borehole advancements, Portland cement (grout mix) will be utilized to backfill <br /> each borehole; a tremie pipe will be utilized for the grout if necessary. The SJCEHD will <br /> be given the opportunity to inspect the grout mix prior to backfilling activities. <br />