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05 May 2021 AdvancedGeo <br /> An Employee-Owned Company <br /> Project No. 21-6440 ' <br /> Page 3 of 4 <br /> time, date, and sampler's initials. Soils encountered in the borings will be visually <br /> classified by AGI 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 photo-ionization detector <br /> (PID) pre-calibrated to isobutylene. <br /> Grab groundwater samples will be collected from each soil boring. Once groundwater has <br /> been 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 extracted <br /> by dedicated disposable polyethylene tubing through the hollow center of the push rods <br /> into the screen section. Samples will be collected into laboratory-supplied, preserved 40- <br /> ml Volatile Organic Analysis (VOA) vials. Appropriately sealed and labeled samples will <br /> be placed in a chilled container under ice and transported under chain-of-custody <br /> procedure to an ELAP-certified laboratory. Each sample container will be labeled with <br /> sample designation, time, date and sampler's initials. <br /> 2.3. SOIL SAMPLE LABORATORY ANALYSIS <br /> Selected soil samples will be analyzed by a California ELAP-certified laboratory for the <br /> following constituents: <br /> • Total petroleum hydrocarbons (TPH) as gas and diesel in accordance with EPA <br /> Method 8015M. <br /> • VOCs in accordance with EPA Method 8260B. <br /> Laboratory reports for all analyses, testing methods, laboratory quality assurance/quality <br /> control (QA/QC) reports, and sample chain-of-custody documentation will be presented <br /> in a report with the findings and recommendations. <br /> 2.4. 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 top three to six inches of the boring abandonments will <br /> be completed flush to surface grade with concrete or native material. The EHD will be <br /> notified for grout inspection at least 48 hours prior to conducting grouting procedures. <br />