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I^ r <br /> PURPOSE AND SCOPE OF WORK <br /> The purpose of performing the hydrocarbon evaluations study is to <br /> provide conclusions as to whether the site is contaminated or is <br /> free of contamination. <br /> Our work consisted of the drilling and sampling of four test <br /> borings', classifying subsurface soil strata and laboratory <br /> testings. These borings were drilled at locations <br /> 2. shown an Plate <br /> FIELD EXPLORATION AND LABORATORY <br /> TESTING <br /> All borings were drilled with a CME-55 <br /> truck-mounted drill rig <br /> equipped with 6-inch diameter continuous hollow stem flight <br /> augers. Material encountered in each boring was vivally classi- <br /> fied in the field and continuously logged by a' geotechnical <br /> engineer in accordance with the Unified Soil Classification <br /> System. Descriptions of this classification system and soils <br /> encountered in the borings are presented on Plates 3 through S. <br /> All soils samples were tested in the field with a Photovac TIP I <br /> Air Analyzer for gas and vapor. Based on the field analysis, the <br /> on-site soils appear to be "clean". <br /> All. soil saiples were obtained in accordance with guidelines <br /> setforth by the California Regional Water Quality Control Board <br /> (CRWQCB) . These samples were later forwarded to an approved <br /> analytical laboratory for .total petroleum hydrocarbons analyses. <br /> SUBSURFACE SOIL AND GROUNDWATER CO�+"DITIONS <br /> A detailed description of the suLsurface soil conditions <br /> encountered is presented on the Boring Togs, Plates 4 'through s, <br /> attached. In summary, the subsurface soils encountered at the <br /> site are described as brown, medium dense, silty 'sand with <br /> interbedded clayey sand to a maximum depth explored of 41,5 feet <br /> below existing grade. <br /> The near surface soils are described as a dark brown , to black <br /> salty clay to a depth of a feet with an 8 inch asphalt pavement <br /> section covering the site. <br /> �. 2 <br />