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27 December 1999 <br /> AGE-NC Project No. 99-0683 <br /> Page 4 of 6 <br /> The proposed probe boring locations many be modified due to field observations or additional <br /> borings may be advanced with approval by the PHS-EHD. Each proposed boring will be advanced <br /> to 30 feet bsg or until the field observations and field screening using an organic vapor meter(OVM) <br /> indicate that detectable petroleum vapors are not present in the soil samples screened from two <br /> consecutive five-foot intervals. <br /> Soil samples will be collected at 5-foot intervals beginning at 5 feet bsg extending to the total boring <br /> depths. Field procedures for advancement of borings and collection of soil samples are presented in <br /> Section 4.1.1. <br /> Selected soil samples from each probe boring will be submitted for laboratory analysis with <br /> concurrence of the PHS-EHD. The selected soil samples will be analyzed by a State of California <br /> Department of Health Services (DHS)-certified laboratory for the following constituents: <br /> • TPH-d by EPA Method 8015 Modified; <br /> • Volatile aromatic compounds (benzene, toluene, ethyl-benzene and total xylenes: BTEX), <br /> and methyl tertiary butyl ether (MTBE) by EPA Method 8020. <br /> Laboratory reports for soil analyses, testing methods, laboratory quality assurance/quality control <br /> (QA/QC) reports, and sample chain of custody documentation will be presented in a report with <br /> findings and recommendations. <br /> 3.3. GRAB GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> Grab ground water samples will be collected if ground water is encountered during the boring <br /> process using a Geoprobe water sampling assembly. Samples will be collected into 40-m1 volatile <br /> organic analysis (VOA) vials and 1-liter amber bottles as appropriate for the required analyses. <br /> Ground water sample collection procedures are presented in Section 4.1.2. Ground water samples <br /> will be analyzed by a DHS-certified laboratory for: <br /> • TPH-d by EPA Method 8015 Modified; <br /> • BTEX and MTBE by EPA Method 8020. <br /> Laboratory reports for ground water analyses, testing methods, laboratory quality assurance/quality <br /> control (QA/QC) reports, and sample chain of custody documentation will be presented in a report <br /> with the findings and recommendations. <br /> Adranced CeoEnvironmental.Inc. <br />