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• <br />• <br />Page <br />2 <br />' <br />Central Valley geomorphic province of California. <br />Proj. <br />No. E88-029 <br />GEOLOGIC AND HYDROLOGIC SETTINGS <br />17, <br />1 PURPOSE AND SCOPE OF THE INVESTIGATION <br />' The purpose of this investigation was to determine if petroleum <br />constituents were present in the subsoils at the location beneath the previous <br />underground storage tanks. <br />The scope of this investigation was limited to the immediate vicinity of <br />the underground storage tank excavation. <br />1 <br />KRAZAN & ASSOCIATES, INC. <br />The project site is located within the City of Ripon, California, just inside <br />the southern boundary of San Joaquin County. Ripon is located within the Great <br />' <br />Central Valley geomorphic province of California. <br />The topography of the site is relatively level. Subsurface materials consist <br />primarily of unconsolidated materials deposited by the Stanislaus River and its <br />tributaries. The Stanislaus River is a part of the San Joaquin River System. The <br />alluvial deposits are generally composed of sands, silty sands, and some minor <br />gravels derived from Sierra Nevada source rocks. <br />The project site is located within the San Joaquin Basin Hydrologic Study <br />Area, which is primarily an and to semi -arid environment. Within the study <br />area, 37 groundwater basins and areas of potential groundwater storage have <br />' <br />been identified. Storage capacity in this study area is approximately 570 million <br />acre-feet. Useable storage totals 80 million acre-feet. Fresh -water bearing <br />deposits, generally alluvium, have a maximum thickness of 4,400 feet. <br />The area in which the project site is located is part of the Eastern San <br />Joaquin County Basin. This basin is subject to extensive overdraft conditions. <br />Overdraft is a condition in which more groundwater is withdrawn than is being <br />replenished by natural and man-made means. Because of this overdraft problem, <br />' <br />declining water levels have caused poor quality waters (delta saline waters) <br />from the Stockton area to migrate toward the project site. <br />17, <br />1 PURPOSE AND SCOPE OF THE INVESTIGATION <br />' The purpose of this investigation was to determine if petroleum <br />constituents were present in the subsoils at the location beneath the previous <br />underground storage tanks. <br />The scope of this investigation was limited to the immediate vicinity of <br />the underground storage tank excavation. <br />1 <br />KRAZAN & ASSOCIATES, INC. <br />