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4 3 3 Soil and Groundwater Sampling and Anal sis <br /> During the drilling of all of the remedial feasibility test wells, undisturbed soil samples will be <br /> collected at five-foot intervals using a modified California split-spoon sampler, lined with two-inch <br /> diameter by six-inch long brass or stainless steel sample sleeves A field geologist will log each of <br /> the undisturbed sod samples for hydrogeologic and lithologic characteristics according to the <br />' Unified Soil Classification System, and screen each sample for any organic vapors using a PID <br />' To further evaluate the extent of impacted soil directly beneath and to the west of the former UST <br /> source area, five soil samples from each boring will be submitted for laboratory analysis These <br /> soil samples will include the ones collected from the groundwater table interface and total depths <br />' of both borings, and three samples from the vadose (i e , unsaturated) soil Additional soil <br /> samples may be submitted for analysis, if necessary to characterize subsurface conditions Field <br />' observations and sample selection will be reviewed with the EHD inspector, prior to sample <br /> submittal to the lab <br />' All soil samples will be sealed with Teflon® film and plastic end caps, labeled, packaged in an iced <br /> cooler and transported with chain-of-custody documentation to a state of California-certified <br /> hazardous waste testing laboratory The lab will analyze each of the soil samples for TPH-as- <br /> gasoline, BTEX, MTBE, DIPE, ETBE, TAME, TBA and 1,2-DCA by EPA Method 8020/8015M <br /> and/or 8260B <br /> To establish baseline groundwater conditions prior to remedial feasibility testing, and to evaluate <br />' potential long-term bio-enhancement during active remediation, groundwater samples will be <br /> collected for microbial analyses Groundwater-grab samples will be collected for analysis from <br /> MW-1, MW-2, the monitoring well proposed to the west of the former UST, and the deep well in <br />' the proposed nested soil vapor extraction well <br /> 15 <br />