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SITE CLOSURE REQUEST REPORT <br /> Former Exxon Service Station No.7-3330 <br /> 1 3128 West Benjamin Holt Drive <br /> 1 Stockton,California <br /> Delta Project No.D093-810 <br /> Page 2 <br /> The surface topography of the site is flat. The site is currently not paved and the surface consists of <br /> exposed soil surrounded by a chain link fence. A second small fence enclosure is located towards the <br /> i <br /> southern end of the property. The enclosure is used to temporarily store drums of purge water generated <br /> from ground water monitoring wells located on the property prior to characterization and disposal. <br /> 2.2 Regional Geology <br /> The site is located in the San Joaquin Valley portion of the Central Valley of California. The Central <br /> Valley lies east of the Coast Ranges and west of the Sierra Nevada Range and extends approximately 400 <br /> miles in a northwest-southeast orientation with an average width of 50 miles. <br /> The basin is an asymmetric synclinal trough containing Jurassic to Holocene sedimentary rocks and <br /> sediments with a maximum thickness of approximately 33,000 feet in the San Joaquin Valley <br /> (Repenning, 1960). <br /> I <br /> The Jurassic, Cretaceous, and Tertiary sedimentary rocks and deposits consist of siltstone, claystone, <br /> sandstone, and conglomerate and are predominantly marine in origin (Hackel, 1966). The source area <br /> for these sediments was most probably the Klamath and Sierra Nevada Mountains (Bailey, et al., 1964). <br /> Pleistocene and Holocene sedimentation of predominantly fluvial and lacustrine mechanisms has resulted <br /> in generally unconsolidated sediments of 330 to 3,300 feet in thickness (Poland and Evenson, 1966). <br /> 2.3 Regional HydrogeolM <br /> The following bodies of water are located near the site: the San Joaquin River, approximately 2.5 miles <br /> to the southwest, the Calaveras River, approximately two miles to the south-southeast; Fourteen-Mile <br /> Slough, located 0.5 miles to the south and one mile to the west; Five-Mile Slough, located 0.7 miles to <br /> the north-northwest; Lake Lincoln, located 0.5 miles to the southwest; North Lake, located 0.7 miles to <br /> the northwest; Grupe Lake, located 0.8 miles to the north-northwest; and Meadow Lake, approximately <br /> 0.6 miles to the southwest. The bodies of water located within one-mile of the site are shown on <br /> Figure 1. <br /> RPT001.810 <br />