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Thrifty oil Company Job No: 13-6782-026-00-00 <br /> January 7, 1988 Log No: HTC-7-1398 <br /> Page : 2 <br /> capacity of the individual tanks ranges from 6 , 000 to <br />' 12, 000 gallons . Locations of the tanks are shown <br /> relative to existing structures on Figure B-1, Plot <br /> Plan . <br /> 1 . 2 Scope of _Investigation <br />' The scope of work for this investigation is in direct <br /> response to parameters established by Thrifty Oil <br />' Company . Four soil borings were excavated around the <br /> underground storage tank cluster . Each boring was <br /> drilled to a depth of 20 feet and soil samples were <br /> collected every 5 feet. Laboratory analysis for total <br /> petroleum hydrocarbons was performed on selected soil <br /> samples where warranted by field observations . Appendix <br />' E contains the original scope of work for this investi- <br /> gation as presented by Thrifty. <br />' 2.0 GEOLOGY_AND_GEOHYDROLOGY <br /> 2. 1 Regional Geology <br />' The site is located in the San Joaquin Valle of the <br /> g Y <br />' Central Valley geomorphic province. Recently published <br /> geologic maps ( see references ) indicate that Holocene <br />' age flood-basin deposits extend from ground surface to <br /> a maxium depth of approximately 100 feet below the <br /> site . Oligocene to Holocene age alluvial deposits lie below <br />' the younger flood-basin deposits to a maximum depth of <br /> approximately 3, 500 feet below ground surface . <br /> Continental and marine rocks of pre-Tertiary to <br /> Oligocene age underlie the alluvial deposits, and are <br /> composed of shale, sandstone and conglomerate . <br /> Crystalline bedrock underlies the sedimentary � <br /> formations . <br />