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. 3 0 SOIL SAMPLING Soil samples will be collected in 2.5 inch-diameter brass rings contained in an 18 inch-long Califorma-modified spit-spoon drive sampler advanced below the lead auger by repeated blows of a 140 pound drop hammer. Samples will be collected at 5 foot depth intervals for the twenty- foot borings and 2 5 foot depth mtervals for the 10 foot borings (or at the direction of the field geologist/engineer) for logging and initial screening. Logging will include visual, tactile, and olfactory observations of soil physical characteristics and will be recorded according to the Unified Sod Classification System and other appropriate descriptors Appropriate decontamination procedures will be followed for all soil collection and handling activities to assure sample representativeness and avoid sample contamination and formation cross-contamunation. Specifically, all drill augers and drive sampler components will be cleaned by high-pressure steam cleaner prior to contacting the formation All soil samples will be screened by ambient temperature headspace methods for indications of hydrocarbon contamination and results of the headspace readings will be recorded. This method involves placing approximately 5 cubic inches of soil into a sealed polyethylene bag and allowing the soil temperature to equilibrate for approximately 15 minutes At that time, the probe of a portable organic vapor meter (OVM) or photo-ionization detector (PID), calibrated with isobutylene, will be inserted into the bag headspace and the reading will be recorded. Samples of material corresponding to the highest three (3) vapor readings from each test boring will be . selected for laboratory analysis. Selected soil samples will be sealed with Teflon sheets, capped, labelled, and transferred under chain-of-custody to a state-certified laboratory 4.0 LABORATORY ANALYSES All chemical analyses of selected soil samples will be performed by a California-certified laboratory. Laboratory analysis to be conducted will consist of the following U S. EPA approved methods: - Total Extractable Hydrocarbons (TEH) utilizing DOHS LUFT Method (gasoline, kerosene, and diesel), Benzene, Toluene, Ethylbenzene, and total Xylenes utilizing EPA Method 8020 (BTEX); and Organic lead utilizing DOHS LUFT Method It is estimated that three samples per boring will be submitted for laboratory analysis Remaining soil samples will be archived for a period of thirty (30) days for future analysis if necessary K064W4 PW 2