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22 February 2000 AGE-NC Project No. 98-0481 Page 4of7 relatively small volume (approximately 3.7 to 6.9 gallons) of the recent unauthorized gasoline release, only one soil boring appears warranted for investigation of the small area. The proposed soil boring location is shown on Figure 3. The proposed soil boring location cannot be situated at the center of the area containing the former west fuel dispenser, former waste oil UST, and the piping rupture due to the current Iocations of active gasoline product piping and fuel dispensers at the site. Therefore, the proposed soil boring will be located as close to the investigation area as site conditions will allow. If significant soil contamination is observed in the proposed soil boring below a depth of 20 feet bgs, an additional soil boring may be advanced to further delineate the extent of the hydrocarbon impact. The location of the additional soil boring will be selected during the site assessment field work, based on field observations and will have the concurrence of the PHS-EHD. The soil boring is proposed to be advanced to a depth of 30 feet bsg. However, total depth of the boring will be based on field observations and field screening using an organic vapor monitor (OVM). Soil samples will be collected from the boring at five-foot intervals beginning at 10 feet bsg to the total depth. Field procedures for advancement of the soil boring and collection of soil samples are presented in Section 5.2. At least one sample from each probe boring (if more than one is advanced) will be submitted for laboratory analysis. Selected soil samples will be analyzed by a State of California Department Health Services (DHS)- certified laboratory for the following constituents: • TPH-g by EPA Method 8015 Modified/5030; • TPH-motor oil (TPH-mo) by EPA Method 8015 Modified/5030 • BTEX by EPA Method 8020; • Fuel oxygenates including MTBE, tertiary-butyl alcohol (TBA), di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE) and tertiary-amyl methyl ether (TAME) by EPA Method 8260; • Chlorinated hydrocarbons by EPA Method 8260; and • Total metals, including cadmium, chromium, nickel, and zinc by EPA Method 6010. 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. • Advanced GeoEnvironmental,Inc.