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:� _ �' �. F. -- v � •- �� tea, _''� . <br /> S <br /> r: <br /> December 11, 1991 <br /> Beacon Service Station Na.492, �4anteca, California pROGEULOGY <br /> REGIONAL GEOLOGY AN <br /> The area is underlain by alluvial fan deposits of the Great Valley and are of Recent age: <br /> end sand (Boyers, T.H.. 1966). The <br /> these sediments consist Aunconsolidated ciyµestward slope• <br /> topographic surface is nearly flat with a slight <br /> Ground-Wafer Basin. <br /> The site is in the E (California <br /> astern San Joaquin ubasin has been developed for <br /> Department of Water Resources. 1988) The ground-water <br /> intensive irrigation, domestic. industrial, municipal, and stock use. <br /> wells,we expect the depth to ground <br /> Based on current data from existing onsite and nearby rave with a regional direction of flow <br /> wafer near the site to be approximately 30 feet below g <br /> g <br /> 14, <br /> , from <br /> to the northeast. Based on survey and water level data obtained on Octob eted the9 round' <br /> the site and the nearby property to the north (Tables 3 and 4), we interpr g <br /> •ter flow direction to be northeastern• with a gradient of 0.0004, as shown on the <br /> wn <br /> Potentiometric Surface Map (Plate 3). <br /> SCOPE OP WORK <br /> eviously detected dissolved <br /> The purpose of this investigation is nt tithe round watwhether er hydraulically downgradient <br /> hydrocarbons or free product are present 1n g round-water flow <br /> from the existing wells and to more accurately measure the direction of g <br /> and gradient. We will conduct the following tasks: <br /> a Update the Site Safety Plan. <br /> o Acquire a drilling permit from the San Joaquin County Public Health <br /> Services. Environmental Health Division (SJCPHS-EHD). and <br /> o Contract a licensed <br /> to ground <br /> depthwell (approximately <br /> suffi lent to l construct a coone n <br /> struct t°ringeter soil boring <br /> water and to a <br /> 40 feet)- The well will be drilled downgradient of existing wells, based an <br /> 4 � <br /> 961()2-7w <br />