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01 June 1999 AGE-NC Project No. 99-0608 Page 3 of 6 Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to mobilization, each soil probe location will be clearly marked and an utility clearance obtained through Underground Service Alert. 3.3. SOIL SAMPLE COLLECTION AND ANALYSIS Initially, AGE proposes to advance one soil probe boring in the vicinity of the former UST to evaluate the vertical extent of petroleum hydrocarbon impaction. The proposed probe boring location is illustrated in Figure 2. Total depth of the probe boring will be based on field observations and field screening using an organic vapor meter(OVM)equipped with a photo-ionization detector(PID: Thermo Environmental 580A, 10.0 eV, calibrated to isobutylene). Soil samples will be collected from the probe boring at five-foot intervals from ground surface to the total depth of the boring. Field procedures for advancement of probe borings and collection of soil samples are presented in Sections 4.1 and Section 4.2, respectively. Selected soil samples will be analyzed by a California Department of Health Services (DHS)- certified laboratory for the following constituents: • TPH-g, TPH-d, and TPH-mo by EPA Method 8015 Modified/5030; and • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) by EPA Method 8020. Laboratory reports for soil analyses, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in a report with findings and recommendations. 3.4. IN-SITU GROUND WATER SAMPLE COLLECTION AND ANALYSIS During the soil assessment activities,grab ground water samples may be collected and analyzed from the soil probe boring (Figure 2). In-situ ground water sample collection procedures are presented in Section 4.3. Selected groundwater samples will be analyzed by a DHS-certified laboratory for the following constituents: Advanced Gco£nironmental,Inc.