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29 November 2001 <br /> AGE-NC Project No. 01-0887 <br /> Page 4 of 6 <br /> The proposed probe boring locations may be modified due to field observations or additional borings <br /> may be advanced with approval by the PHS-EHD. The proposed probe borings will be advanced to <br /> first encountered ground water,anticipated to be approximately 10 feet bsg,to collect soil and`grab' <br /> ground water samples. If field indications of contamination are encountered below the proposed <br /> depths, borings will be advanced until the field observations and field screening indicate that <br /> detectable petroleum vapors are not present in the soil samples screened from two consecutive five- <br /> foot intervals. An organic vapor meter(OVM), equipped with photo-ionization detector(PID)will <br /> be used for field screening. <br /> Soil samples will be collected at 5-foot intervals beginning at 5 feet bsg extending to the total probe <br /> boring depths. Field procedures for advancement of borings and collection of soil samples are <br /> presented in Sections 4.1. and 4.2. <br /> 3.3. GROUND WATER SAMPLE COLLECTION <br /> Ground water samples will be collected from two of the borings using a Geoprobe water sampling <br /> assembly. Samples will be collected into three 40-mI volatile organic analysis (VOA) vials and <br /> plastic bottles as appropriate for the required analyses. Ground water sample collection procedures <br /> are presented in Section 4.3. <br /> 3.4. LABORATORY ANALYSES <br /> Ground water samples and selected soil samples from each probe boring will be submitted for <br /> laboratory analysis with concurrence of the PHS-EHD. The selected soil samples will be analyzed <br /> by a State of California Department of Health Services(DHS)-certified laboratory for the following <br /> constituents: <br /> • TPH-g by EPA Method 8015 Modified; <br /> • BTEX and the oxygenated ether methyl tertiary-butyl ether by EPA Method 8020; and <br /> Oxygenated compounds - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> MTBE, tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), methanol, ethanol, <br /> ethyldibromide (EDB)and 1,2-dichloroethane(1,2-DCA)in accordance with EPA Method <br /> 8260 Modified, respectively. <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. <br /> Advanced GeoEnvironmenta4 Inc. <br />