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PURPOSE AND SCOPE OF WORK <br /> The purpose of performing the hydrocarbon evaluation study is to <br /> ' provide conclusions as to whether the site is contaminated or is <br /> free of hydrocarbon contamination. <br /> ' Our work consisted of drilling and sampling three test borings, <br /> classifying subsurface soil strata and laboratory testings . <br /> ' Locations of these borings are shown on Plate 2 . <br /> ' FIELD EXPLORATION AND LABORATORY TESTING <br /> All borings were drilled with a CME-55 truck-mounted drill rig <br /> ' equipped with 6-inch diameter hollow stem augers on April 5, <br /> 1988 . Material encountered in each boring was visually <br /> ' classified in the field and continuously logged by our field <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 B. <br /> All soils samples were tested in the field with a Gastech <br /> ' combustible gas detector for gas and vapor. Based on the field <br /> analysis , the on-site soils appear to be "contaminated" . <br /> ' Readings from each sample are presented in the boring log. <br /> All soil samples were obtained in accordance with guidelines <br /> ' set forth 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 /> ' A copy of the laboratory results is attached with this report. <br /> Our field program was coordinated with Mr. Donald L. Roek of Roek <br /> Construction. Locations of soil borings were indicated by <br /> measured distances provided by Mr. Roek. However, distances did <br /> ' not indicate from face of curb or from back side of curb. <br /> Therefore, test boring TB-2 was a probe boring. Test boring TB-3 <br /> was measured from the back of sidewalk to the point of field <br /> exploration. <br /> 2 <br />