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Chaney, Walton & MCCall («C) <br /> The distribution and rationale for the sampling locations are summarized as follows: <br /> PROPOSED SOIL BORING APPROXIMATE LOCATION 1 PRELIMINARY RATIONALE <br /> OF SOIL BORING FOR THE BORING LOCATION <br /> SB-I In the approximate center of the If petroleum hydrocarbons were, <br /> former UST excavation,an initial still present,the boring location <br /> soil samples will be collected and soil samples should aid in the <br /> immediately below the pea gravel identification of the vertical <br /> backfill. A second soil sample extent of constituents beneath the <br /> will be collected at the same former UST excavation. <br /> Iocation,approximately 5 to 10 <br /> feet below the initial sample. <br /> SB-2 At a location approximately 5 to Confirm the absence of elevated <br /> 10 feet beyond the former UST petroleum hydrocarbon <br /> excavation,two soil samples will concentrations in soils beyond the <br /> be collected. These samples will excavation boundary. The 10- <br /> be obtained at depths of foot depth sample should be <br /> approximately 10 and 15 feet similar to the base of the former <br /> below grade. The actual surface UST excavation. The 15-foot <br /> location will be subject to access depth sample should aid in the <br /> limitations,including the possible identification of the vertical <br /> presence of facility utilities or extent of constituents, if present. <br /> structures. <br /> Soil boring installation permits will be obtained from the San Joaquin County PHS/EHD <br /> once the Work Plan has been approved and the pre-field inspection described below has <br /> been accomplished. <br /> Conduct Field Activities <br /> Prior to conducting subsurface/intrusive field activities, CW&M will inspect the Site with <br /> facility personnel to evaluate the specific locations proposed for soil sampling activities. <br /> In addition, a private utility locator service will be retained to clear the proposed <br /> sampling locations for detectable utilities prior to drilling. <br /> Soil Boring Installation <br /> CW&M will utilize the services of a drilling subcontractor, who will employ standard <br /> hollow-stem auger techniques to install the soil borings. The subcontractor will utilize a <br /> clean, 2.5-inch diameter split spoon sampler that will be equipped with clean stainless <br /> steel or brass liners. Collected soil samples will be sealed at both ends with either Teflon <br /> sheets or clean aluminum foil, and then capped with tight fitting, clean, plastic end-caps. <br /> The boreholes, worker breathing zone, and selected soil samples will be field screened <br /> using a portable Photo Ionization Detector(PTD) device to monitor for the possible <br /> presence of volatile organic compounds. <br /> A description of the subsurface deposits penetrated during drilling will be prepared by the <br /> field geologist onsite, and provided with other field information on a soil boring logs. <br /> The soil boring logs and other field documentation data such as PID measurements will <br /> be provided in the Former VFO - Site Assessment Addendum Report. <br /> DF100101.SJCPH.wkp.011800 5 530.758.8128 v/f <br /> rcegroup@earthlink.net <br />