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24 October 2019 Advanced <br /> AGE Project No. 17-4047 EnvironrnentaI <br /> Page 4 of 5 ,'.NO.`IV <br /> Soil samples will be collected from each boring at discrete intervals of 1 , 5, and 10 feet <br /> bsg using a 1.45-inch Geoprobe soil sampling assembly loaded with a two-foot long <br /> acetate liner. Upon sample retrieval, a selected portion of the liner will be cut and covered <br /> with Teflon sheets, capped and sealed with tape. Appropriately sealed and labeled <br /> samples will be placed in a chilled container under ice and transported under chain-of- <br /> custody procedure to an ELAP-certified laboratory. Samples will be analyzed for the <br /> constituents listed above. Each sample will be labeled with boring designation, depth, <br /> time, date and sampler's initials. Soils encountered in the borings will be visually classified <br /> by AGE personnel in accordance with the Unified Soil Classification System (USCS). <br /> BORING ABANDONMENT <br /> All soil borings will be permanently sealed to prevent vertical migration of potential <br /> contaminants. Soil borings shall be abandoned by backfilling with cement grout from the <br /> total depth to surface grade. The grout mixture will consist of Type 1/II Portland neat <br /> cement and 5-6 gallons of water per 94-pound sack of cement. The top three to six inches <br /> of the boring abandonments will be completed flush to surface grade with concrete or <br /> native material. The EHD will be notified at least 48 hours prior to conducting grouting <br /> procedures. <br /> 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 and soil generated during drilling activities will <br /> be containerized in properly labeled Department of Transportation (DOT)-approved <br /> 55-gallon drums and stored on-site in an area generally lacking public access. Disposal <br /> alternatives will be evaluated at a later date based on laboratory results. <br /> REPORT PREPARATION <br /> Upon completion of field work and receipt of final laboratory analysis, a report will be <br /> prepared presenting the findings of the investigation. The report will include a description <br /> of the work performed and results of the sampling and analysis. Conclusions, applicable <br /> recommendations and maps will be included in the report. The report will be reviewed <br /> and signed by a California Professional Geologist. <br />