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23 December 2005 AGE-NC Project No. 04-1045 Page 2 of 6 2.2. DRILLING AND SOIL SAMPLE COLLECTION AGE proposes to advance three pilot soil borings at the site for installation of ground water monitoring wells,using atruck-mounted,hollow-stem drill rig equipped with 8.25-inch hollow-stem augers to advance the well borings to approximately 35 feet bsg;the total depth of each well boring may vary according to hydrogeologic/geologic conditions encountered during drilling. • Proposed pilot boring MW-4 will be advanced approximately 58 feet west of existing well MW-3, at the southern edge of the property down-gradient of the known hydrocarbon release, • Proposed pilot boring MW-5 will be advanced approximately 98 feet east of MW-3,outside the fenced enclosure and downadient of the known hydrocarbon release, • Proposed pilot boring MW-6 will be advanced approximately 110 feet east of MW-1,cross- gradient from highest known concentration of dissolved hydrocarbons (Figure 2). Soil samples will be collected from within the 8.25-inch hollow-stemaugers at five-foot intervals using a California split-spoon sampler and brass sleeves.The soil sample wlththe highest observable contamination should be analyzed.Selected soil samples with geologic significance or considerable �7 lack of hydrocarbon impact should be analyzed by a State of California DHS-certified laboratory for the following constituents: • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in accordance with EPA Method 8015 Modified, S 2 • Volatile aromatic hydrocarbons: benzene, toluene, ethyl benzene and total xylene (BTEX)— z in accordance with EPA Method 8020 and • Oxygenated compounds:di-isopropyl ether(DIPS),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), j/C methanol, ethanol, ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260. Laboratory reports of soil analyses, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in a report 2.3. MONITORING WELL INSTALLATION, DEVELOPMENT AND SURVEY The pilot borings will be completed as single-level ground water monitoring wells screened from 15 to 35 feet bsg. Following installation, each well will be developed to maximize water flow and minimize the amount of fine-grained sediment drawn into the well during pumping or bailing, and the top of each existing and newly installed well casing (well head) will be surveyed to determine Advanced GeoEnvironmeatal,Inc.