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July 8, 1988 AGS Job No. 38032-2 <br /> ' UNOCAL Service Station No. 6981, Stockton, California <br /> equipped with cleaned brass sleeves. The samples will be <br /> �. collected by advancing the boring to a point immediately above <br /> the sampling depth, then driving the sampler into the native soil <br /> through the hollow center of the auger. The sampler will be <br /> driven 18 inches with a standard 140-pound hammer repeatedly <br /> dropped 30 inches. The number of blows required to drive the <br /> sampler each successive 6-inch interval will be counted and <br /> recorded to give an indication of soil consistency. Examples of <br /> a Field Boring Log form (Plate P-4) and the Boring Log Plate used <br /> in our final report (Plate P-5) are included with this Work Plan. <br /> Each sample will be subjectively analyzed with a field <br /> photoionizing hydrocarbon vapor detector. These devices are <br /> useful for semiquantitatively evaluating the relative <br /> concentrations of volatile hydrocarbons. The photoionizing <br /> hydrocarbon vapor detector cannot be used to give absolute levels <br /> of contamination. <br /> soil samples selected for chemical analyses will be sealed with <br /> aluminum foil, plastic caps, and airtight tape. The samples will <br /> then be labeled and immediately placed in iced storage for <br /> transport to the analytical laboratory for testing. Chain of <br /> Custody Records will be initiated by the.geologist in the field <br /> ORO <br /> APPI1ed GevSYSM*MS - <br />