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Limited Environmental Investigation <br /> ARCO Service Station No. 6100, Tracy, CJuly 16, 1990 <br /> ali California AGS 30041-1 <br /> ------------- <br /> REGIONAL GEOLOGY AND HYDROGEOLOGY <br /> f <br /> The site is underlain by the Turlock Lake Formation,which consists of Pliocene-Pleistocene <br /> nonmarine ediment�hat range in size from gravel to clay(Rogers, T.H. 1966). <br /> ® To the west lies Middle to Lower Pliocene nonmarine sediments. Beneath the PIiocene <br /> t <br /> deposits lie Upper Cretaceous marine sedimentary rocks.The site is in an area of northwest- <br /> f <br /> southeast trending faults. f <br /> The site is in the northwestern San Joaquin County Ground-Water Basin (California <br /> .,. Department of Water Resources, 1988). According to the Sart Joaquin public Health <br /> Service, thettepth,aa ground water.is greater.4han;100 feet below'grade: <br /> g. <br /> i <br /> PROXIMITY OF WELLS ANIS UTILITIES <br /> } <br /> The site map provided by ARCO shown a septic tank onsite northwest of the station <br /> building and a second septic tank along with a Ieach field on the northwest boundary of the ; <br /> f <br /> property. It is our understanding from San Joaquin County PIanning Commission that there <br /> are no water or sewer lines in the area. <br /> 3 <br /> •4p,®Ideer GeaSystel,"S <br />