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3,2.3 Soil SAMIolin and An_'*_ During the drilling of the SVE test wells, soil samples will be collected at 5-foot intervals using a modified California split-spoon sampler lined with brass or stainless steel sleeves, The proposed AS well will be continuously cored, A field geologist will log the continuous core and all soil samples for hydrogeologic and lithologic characteristics according to the Unified Soil Classification System, and screen each sample for any organic vapors using a photoionization detector (PID), To further quantify the mass of gasoline compounds within the former UST source area, the discrete soil samples collected at 10, 20, 30, 40 and 45 feet from the proposed nested SVE test wells and at 10, 20 and 25 feet from the single-casing well boring will be submitted for laboratory analysis, Each soil sample will be sealed with Teflone film and plastic end caps, labeled, packaged in an iced cooler, and transported with chain-of-custody documentation to a state of California-certified hazardous waste testing laboratory for analysis. The lab will analyze each of the soil samples for TPH-as-jet fuel by EPA Method 8015M, TPH-as- gasoline and BTEX by EPA Method 802113 3C1f kt and/or 8260B, and for MTBE, PIPE, ETBE, TAME, TBA, 1,2-DCA and EDB by EPA Method 8260B. 3.3 Remedial Feasibility Testing two The proposed remedial feasibility testing will include a soil vapor extraction test and an air sparge test. Groundwater samples will also be collected for microbial analysis to evaluate monitored natural attenuation as a potential remedial alternative. 1.3._1 Soil Vapor Extraction Tests To evaluate the effectiveness of SVE on subsurface vadose zone soils,four-hour SVE tests will be conducted on each of the five SVE well screen intervals, for a total of 20 hours of SVE testing, The SVE test equipment will consist of a 5-horsepower vacuum blower, air filter, silencer and knockout tank. The SV E blower will produce air-flow at a rate of up to 200 cubic feet minute (cfm) and a vacuum of up to 15 inches of mercury. Soil vapors extracted during the tests will be filtered through two, 200-pound activated carbon drums, prior to discharge to the atmosphere, Vacuum gauges and air-tight well caps will be placed on the surrounding observation wells (MW- 1, IW-3 and the SVE wells not being used as a test well), During the SV E tests, stack air-flow and test well vacuum rates will be monitored, and lower explosive limit (LEL), organic vapor concentration, oxygen concentration, and wellhead vacuum and will be measured every hour in the observation wells.