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11 January2021 AdvancedGeo <br /> Project No. 20-6274 An Employee-Owned Company <br /> Page 3 of 4 <br /> organic vapor meter (OVM), equipped with photo-ionization detector (PID) pre-calibrated <br /> to isobutylene. <br /> Grab groundwater samples will be collected from the two borings advanced to 35 feet <br /> bsg. Once groundwater has been encountered, a Geoprobe (or similar) push-driven water <br /> sampling device will be advanced four feet into the water-bearing zone. Grab groundwater <br /> samples will be collected using a Geoprobe water sampling assembly fitted with a pre- <br /> cleaned, one-inch diameter 0.01-slotted temporary well screen. Each groundwater <br /> sample will be extracted by dedicated disposable polyethylene tubing through the hollow <br /> center of the push rods into the screen section. Samples will be collected into laboratory- <br /> supplied, preserved 40-ml Volatile Organic Analysis (VOA) vials and 1-liter polyethylene <br /> sample containers. Appropriately sealed and labeled samples will be placed in a chilled <br /> container under ice and transported under chain-of-custody procedure to an ELAP- <br /> certified laboratory. Each sample container will be labeled with sample designation, time, <br /> date, and sampler's initials. <br /> 2.3. LABORATORY ANALYSIS <br /> Selected soil and groundwater samples will be analyzed by a California ELAP-certified <br /> laboratory for the following constituents: <br /> • Title 22 metals in accordance with EPA Methods 6010B/6020 <br /> • Volatile organic compounds (VOCs) in accordance with EPA Method 8260B. <br /> • Chloride and nitrate-N in accordance with EPA Methods 300.0. and 300.1 <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/EQUIPMENT DECONTAMINATION <br /> The soil borings will be permanently sealed to prevent vertical migration of potential <br /> contaminants. The 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 abandonment will <br /> be completed flush to surface grade with concrete or native material. The EHD will be <br /> notified for grout inspection at least 72 hours prior to conducting grouting procedures <br /> All sampling tools used for sample collection will be thoroughly rinsed with clean water <br /> after being washed with a solution of Alconox. All probing rods will be cleaned prior to <br /> advancement at each probe boring location. Any soil or water waste generated during <br /> field activities will be containerized in properly labeled DOT-approved 55-gallon drums <br />