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02 January 2015 <br />AGE Project No. 13-2557 <br />Page 6 of 7 <br />Powerprobe or other probe advances soil probe borings using a hydraulic hammer to <br />drive soil and groundwater sampling tools to specified depths. <br />4.1.1. Soil Sampling <br />Soil samples will be collected at discreet five-foot intervals beginning at five feet bsg <br />using a 1.45 inch Geoprobe soil sampling assembly loaded with a two-foot acetate liner. <br />Upon sample retrieval, a selected portion of the liner will be cut and covered with Teflon <br />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 CDPH-certified laboratory. <br />Samples will be analyzed for the constituents listed in Section 3.3. 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 />4.1.2. Grab Groundwater Sampling <br />Grab groundwater samples will be collected from each boring to assess the lateral and <br />vertical extent of petroleum hydrocarbon-impacted groundwater. For collection of grab <br />groundwater samples, soil borings will be advanced to the top of the groundwater table <br />as identified by collection of a saturated soil sample. Once groundwater has been <br />encountered, a Geoprobe (or similar) push-driven water sampling device will be <br />advanced four feet into the water-bearing zone. Grab groundwater samples will be <br />collected using a Geoprobe water sampling assembly fitted with a pre-cleaned, one-inch <br />diameter 0.01-slotted temporary well screen. Each groundwater sample will be <br />extracted by dedicated disposable polyethylene tubing through the hollow center of the <br />push rods into the screen section. Samples will be analyzed for the constituents listed in <br />Section 3.3. and will be collected into laboratory-supplied, non-preserved 40-ml Volatile <br />Organic Analysis (VOA) vials. <br />For the deep soil boring advanced in the center of the UST excavation or any deep <br />boring proposed, a grab groundwater sample will be collected at the top of the <br />groundwater table and then again at the total depth of the boring. <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 />Advanced GeoEnvironmental Inc.