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The excavation is not expected co, extend to the Iocation of underground structures <br /> or utilities The initial estimate of the extent of the excavation is not intended to <br /> f interfere with the two piezometers <br /> Prior to excavation a grading permit will be obtained from the City of Tracy to <br /> perform this work This site is exempt from Air Quahty permits required by the San <br /> Joaquin County Pollution Control District because the site contains diesel <br /> contamu►ation only <br /> Soil will be stockpiled adjacent to the excavation upon removal Prior to excavation <br /> of any saturated soils, soil berms will be created to cortain moisture from the soil A <br /> basin will be created within the berms th-ough the use of plastic sheeting After <br /> completion of the excavation, soil stockpiles will be covered with plash <br /> During, excavation, soil types will be logged according to the USCS by a qualified <br /> geologist or engineer The location and depth of all soil samples and any uidications <br /> of the contact between undisturbed soils and the soils backfilled at the time of UST <br /> removal will be recorded on a log, of the excavation <br /> 3.2 Confirmation Sampling <br /> An initial set of eight soil samples will be obtained from the floor of the excavation <br /> in a grid pattern shown on Figure 4 to verify that soils containing elevated <br /> hydrocarbon concentrations above the cleanup criteria have been removed <br /> Similarly, no less than eight side wall confirmation tests will be performed <br /> (approximately one test per 18 5 linear feet and side wall) Soil sample locations <br /> within each grid spacing (approximately 12 feet by 13 feet) on the excavation floor <br /> will be determined by a systematic random sampling, approach as suggested by the <br /> EPA (SW846) $oil samples will be obtained from the side walls at a spacing of not <br /> greater than 20 feet. Soil samples will be analyzed immediately after sampling using <br /> a state certified on-site mobile analytical laboratory <br /> Initial soil confirmation samples will be collected at a depth of nine feet. Samples <br /> will be obtained from the bucket of the excavator. Loose soil will be scrapped away <br /> and sample will be obtained by pressing a brass tube into the soil in the bucket <br /> Alternatively, soil samples may be obtained with the use of a hand held soil sampler <br /> with the appropriate extensions to reach the excavation floor and side walls from <br /> outside the excavation The ends of the tube will be covered with aluminum foil <br /> and plastic caps The samples will be labeled and placed in individual zip-lock bags <br /> The samples will remain refrigerated until they are analyzed by the on-site <br /> laboratory <br /> All sampling equipment will be decontaminated before use by using a triple rinse <br /> procedure as below <br /> 3 <br /> AAL <br /> BRUNSING ASSOCIATFS, INC V���� <br />