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December <br /> 16, 1992 Working To Restore Nature <br /> Unocal Service Station No 6981, Stockton, California <br /> A City of Stockton Department of Public Works sanitary sewer lane is beneath March Lane, <br /> south of the site e sandary sewer line braur-hes_uito-tw-o lines at the northwest coder <br /> of March Lane and Pacific Avenueese anches lie beneath the sidewalks that form <br /> east-and-s�oruth-6'6-undaries of the ie._ Vetb_al communication with Mr Ed Pagnano of ) <br /> n#� a 'aciftc ehne ,indicated a pressurized natural gas line on the south side of the <br /> ntdTe line oll�iarch Lane. In add" _ rch Lane is the, <br /> eRsement for the East Bay Municipal Ut lities District (EBNIUD)- agueduci Verbal <br /> communication with Mr Richard Wickham of EBMUD indicates that the A rhe pressured--z <br /> " comprise the Mokelumne Aqueduct and carry approximately tj t! Z.Y�rrill�on <br /> gallons of water per day to East Bay reservoirs <br /> REGIONAL GEOLOGY AND HYDROLOGY <br /> Unocal Service Station No 6981 is in the Central Valley geomorphic province of California, <br /> which is a northwestward-trending, asymmetric structural trough that has been filled with <br /> 6 to 10 miles of sediment ranging in age from Jurassic to Holocene (Page, 1986) The <br /> topographic surface is nearly flat with a slight westward slope Based on an extrapolation <br /> of a geological map prepared by Marchand and Atwater (1979), sediments beneath the site <br /> consist of Quaternary alluvial deposits of the Modesto Formation, which were deposited by <br /> the Mokelumne River The nearest surface stream is the Calaveras River which trends east <br /> and west approximately 1,800 feet southeast of the site <br /> SCOPE OF INVESTIGATION <br /> Work to date was conducted at the site according to our Work Plans No 38032-2 (July 8, <br /> 1988), No 38032-3W (December 1989), and No 38032-4W (September 13, 1991), and <br /> 38032-i0 3 <br />