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02 January 2015 <br />AGE Project No. 13-2557 <br />Page 5 of 7 <br />groundwater samples to assess the lateral and vertical extent of petroleum <br />hydrocarbon impact in the presumed down-gradient direction. <br />Discrete soil samples will be collected from each boring at five-foot intervals. However, <br />field personnel may adjust the frequency and method of sampling in consultation with <br />an AGE Professional Geologist. Additional soil borings will be proposed within the first <br />scope of work, if field detections of petroleum hydrocarbons are present in the northern <br />soil borings. Several borings maybe required north of the proposed boring locations to <br />determine the lateral extent of soil and groundwater contamination from the UST <br />release. <br />3.3. LABORATORY ANALYSIS <br />Selected soil samples and grab groundwater samples will be analyzed by a California <br />Department of Public Health (CDPH)-certified laboratory for the following constituents: <br />TPH-g in accordance with EPA Method 8015 Modified; <br />Volatile organic compounds: benzene, toluene, ethylbenzene, and xylenes <br />(BTEX) and fuel oxygenates MTBE, di-isopropyl ether (DIPE), ethyl tertiary-butyl <br />ether (ETBE), tertiary-amyl methyl ether (TAME), and tertiary butanol (TBA) and <br />lead-based fuel scavengers ethylene dibromide (EDB) and 1,2-dichloroethane <br />(1,2-DCA) in accordance with EPA Method 8260B. <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 />4.0. 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 and groundwater samples, boring abandonment, <br />equipment decontamination and sample handling are presented below. <br />4.1. 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 />Advanced GeoEnvironmental Inc.