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27 February 2015 <br /> AGE-NC Project No. 96-0235 <br /> Page 7 of 10 <br /> i � <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 <br /> extent of petroleum hydrocarbon-impacted groundwater. For collect n of grab <br /> groundwater samples, soil borings will be advanced to approximately 56 feet bsg as <br /> identified by previous investigations. A Geoprobe (or similar) push-driven water <br /> sampling device will be advanced four feet into the deeper, water-bearing zone. Grab <br /> groundwater samples will be collected using a Geoprobe water sampling assembly <br /> fitted with a pre-cleaned, one-inch diameter 0.01-slotted temporary well screen. Each <br /> groundwater sample will be extracted by dedicated disposable polyethylene tubing <br /> through the hollow center of the push rods into the screen section. Samples will be <br /> analyzed for the constituents listed in Section 3.3. and will be collected into laboratory- <br /> supplied, non-preserved 40-ml Volatile\Organic Analysis (VOA) vials and one-liter <br /> amber bottles. <br /> Appropriately sealed and labeled samples will be placed irn_a chilled container under ice <br /> and transported under chain-of-custody procedure to "a CDP .=certified laboratory. Each <br /> sample container will be labeled with sample design on, time, date and sampler's <br /> initials. <br /> �fi,va <br /> 4.1.3. 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 <br /> boring abandonments will be completed flush to surface grade with concrete. The <br /> SJCEHD will be notified for grout inspection at least 40urs prior to conducting <br /> grouting procedures. <br /> Advanced GeoEnvironmental Inc. <br />