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20 October 2014 <br /> AGE Project No. 09-1692 <br /> Page 3 of 4 <br /> • One soil boring will be advanced approximately 15 feet south of the eastern side <br /> wall of Excavation Area B to approximately 10 feet bsg to define the lateral extent <br /> of adsorbed petroleum hydrocarbon impact. <br /> Additionally, if field observations indicate diesel-impacted soil is still present in the <br /> samples collected from the borings advanced south of Excavation Area B, then one <br /> contingency boring will be advanced approximately 15-20 feet south of the initial boring <br /> locations in an attempt to complete the lateral definition. <br /> Discrete soil samples will be collected from each boring at two- or three-foot intervals. <br /> However, field personnel may adjust the frequency and method of sampling in <br /> consultation with an AGE Professional Geologist. <br /> 2.3. LABORATORY ANALYSIS <br /> Selected soil samples will be analyzed by a California Department of Public Health <br /> (CDPH)-certified laboratory for the following constituents: <br /> • TPH-d in accordance with EPA Method 8015 Modified; <br /> • Benzene, toluene, ethylbenzene, and xylenes (BTEX) in accordance with EPA <br /> Method 82608. <br /> Laboratory reports for soil sample and water analyses, testing methods, laboratory <br /> quality assurance/quality control (QA/QC) reports, and sample chain-of-custody <br /> documentation will be presented in a report with the findings and recommendations. <br /> Electronic deliverable format (EDF) files of the laboratory analytical results will be <br /> submitted to the State of California GeoTracker database. <br /> 3.0. PROCEDURES <br /> All field procedures will be overseen by an AGE representative under the supervision of <br /> a California Professional Geologist. Procedures for advancing soil probe borings, <br /> collection and analysis of soil samples, boring abandonment, equipment <br /> decontamination and sample handling are presented below. <br /> 3.1. SOIL PROBE BORING ADVANCEMENT <br /> Proposed soil borings will be advanced using a truck mounted AMS Powerprobe 9600 <br /> or Geoprobe 5400 direct-push probing unit equipped with 1.25-inch probing rods. The <br /> Powerprobe or other probe advances soil probe borings using a hydraulic hammer to <br /> drive soil sampling tools to specified depths. <br /> Advanced GeoLnvironmental Inc. <br />