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05 November 2007 AGE-NC Project No. 06-1481 Page 4 of 7 the risk from the prior detections of chemicals at the site. AGE will advance a total of 28 borings using direct push technology in the areas of concern to assess for contaminant-impacted vapor, or soil and/or ground water beneath the site. • Seven borings will be advanced to twenty feet below surface grade (bsg) for the collection of soil samples. • Eighteen soil borings will be advanced for the collection of soil vapor samples collected from a depth of 5 feet bsg. • Three borings will be advanced to depth of 45 feet or until ground water is encountered for the collection of grab ground water and soil samples. The proposed probe boring locations are illustrated in Figure 2. Field procedures for advancement of probe boring and collection of soil samples are presented in Sections 4.1 and 4.2. As the borings are advanced for soil sampling, soil will be collected at 5-foot intervals beginning at 5 feet bsg and extending to the total depth of the probe boring. Selected soil samples from each probe boring may be submitted for laboratory analysis. Samples selected for analysis will be analyzed by a State of California Department of Health Services(DHS)-certified laboratory for some or all of the following constituents: • Total petroleum hydrocarbons quantified as gasoline (TPH-g), diesel (diesel),hydraulic oil (TPH-ho) and motor oil (TPH-mo) in accordance with EPA Method 8015M; • Volatile organic compounds,including benzene,toluene,ethylbenzene and xylenes(BTEX), and methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8260; and • CAM 17 Metals in accordance with EPA Method 6010B. 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. 3.3. GRAB GROUND WATER SAMPLE COLLECTION AND ANALYSIS Grab ground water samples will be collected from three of the ten borings based on site conditions during the boring process using a Geoprobe water sampling assembly.Samples will be collected into 40-m1 volatile organic analysis(VOA)vials and 1-liter amber bottles as appropriate for the required Advanced GeoEnvironmental,Inc.