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05 January 2018 AdvancedGeo <br />AGE Project No. 18-4265 Environmental <br />Page 5 of 6 ffig. <br />GROUNDWATER SAMPLING <br />AGE does not anticipate that groundwater will be encountered during this investigation. <br />However, if necessary groundwater samples will be collected utilizing the following <br />methods. <br />A Geoprobe (or similar) push-driven water sampling device will be advanced into the <br />water-bearing zone or a temporary well screen will be installed in the borehole. Following <br />the installation of the water sampling device or temporary well screen, depth to <br />groundwater will be measured inside the sampling device or well screen. Grab <br />groundwater samples will be collected from the top of the water-bearing zone using a <br />Geoprobe water sampling assembly fitted with a pre-cleaned, one-inch diameter 0.01- <br />slotted temporary well screen or directly from a temporary well screen installed in the <br />borehole. Each groundwater sample will be extracted by dedicated disposable <br />polyethylene tubing through the hollow center of the push rods into the screen section. <br />Samples will be analyzed for the constituents listed above and will be collected into <br />laboratory-supplied, preserved 40-ml Volatile Organic Analysis (VOA) vials. <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 CDPH-certified laboratory. Each <br />sample container will be labeled with sample designation, time, date and sampler's <br />initials. <br />EQUIPMENT DECONTAMINATION/WASTE MANAGEMENT <br />Prior to use, all non-disposable sampling tools used for sample collection will be <br />thoroughly rinsed with clean water after being washed with a solution of Alconox. Any soil <br />or water waste generated during field activities will be containerized in properly labeled <br />DOT-approved 55-gallon drums, and stored on-site in an area lacking public access. <br />Disposal alternatives will be evaluated based on results of laboratory analysis. <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. Borings advanced below the groundwater table will be <br />abandoned with grout utilizing tremie procedures. The top three to six inches of the boring <br />abandonments will be completed flush to surface grade with native soils or concrete. The <br />SJCEHD will be notified for grout inspection at least 48 hours prior to conducting grouting <br />procedures.