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* : 14 Septemb'ei 199$ AGE-NC Project No. 98-0468 Page 5 of 10 3.2. SOIL SAMPLE COLLECTION AND ANALYSIS A total f four,soil borings will be advanced for collection of soil and ground water samples. The proposed sail boring-locations,as well as the approximate extent'of previously reported hydrocarbon impacts in soil, are shown on Figure 3.As shown on Figure 3,three of the proposed soil borings are . located down gradient (north) of the former UST locations, and-one soil boring is proposed to be u located up gradient (south) of the former UST locations. Two of the soil borings will be advanced to the top of the water table at an approximately depth of 1 S feet bsg. In addition,two of the soil borings will be advanced below the water table to approximately 40 feet.bsg. Soil borings will be continuously sampled with drive-samples for laboratory analysis collected at five-foot intervals from ground surface to the top of the water table. Field procedures for advancement of soil-bings ^and collection of soil samples are presented in Section 4.1. A total of up t 10 soil samples will be ` submitted for laboratoryanalysis. At least onesam le from each robe boring will be submitted for . Y p P g (�.-• laboratory analysis. Selected soil samples will be analyzed.by a State of California Department of Toxic Substances Control'(DTSC)-certified laboratory for the following constituents: • TPH-d by EPA Method 8015 Modified/5030; • TPH-g.by EPA Method 8015 Modified/5036; • BTEX by EPA Method'8020; and • 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. Laboratoryreports 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. IN-SITU,GROUND WATER SAMPLE COLLECTION AND ANALYSIS During the soil boring activities, a total of four in-situ grab ground water samples, one from each of . the soil borings, will'be collected for laboratory analysis. Proposed soil boring/iti-situ ground water .sample locations, as well as the approximate area of previously,reported hydrocarbon impacts in ground water,are shown on Figure 4. In-situ ground water samples will be collected at the top of the ,.ground water,table zone at approximately 15,feet bsg utilizing hydropunch-equivalent sampling •,techniques. The procedures for in-situ ground water sample collection are presented in Section 4.2. Advanced GeoEnvironmenati,Inc.