ARCHIVED REPORTS XR0012580 - Laserfiche WebLink

Home Browse Search

N Page 4 February 6, 1990 Job No. 211-71-6 SITE CONDITIONS The Douglas Gas Station is located on the east side of South Cherokee Lane,east of the intersection with Vine Street. The site is bordered by a restaurant to the south,a swimming pool retail store(previously an automotive repair shop) and a gas station/car wash to he north, automobile sales lots to the northwest, and residential housing to the west and east. The Douglas Gas Station site(lot z,' ze of approximately 230x250 feet) lies on nearly-flat terrain at an elevation of approximately 52 feet above mean sea level The Douglas Gas Station is situated Ona composite of artificial fill and natural alluvial fan and river terrace deposits associated with the Mokelumne Diver. The majority of the subject property is currently covered with several inches of asphalt or concrete, The condition of the asphalt ranges from relatively good condition to highly cracked in several areas. �' GIONAL GEOLOGIC AND HYDROGEOLOGIC SETTING The Douglas pias Station site is Iocated in the San Joaquin Valley within the Central Valley physiographic province. A regional geologic map of the Lodi 15-minute quadrangle b y Marchand and Atwater shows that the site is underlain by Late Pleistocene-age alluvium belonging to the Modesto Formation seed he Regional Geologic Map, Figure 3). Marchand and Atwater describe these sedenents as consisting primarily of sand with minor gravel and silt. The alluvial deposits are interpreted as alluvial fan and river terrace deposits associated with the nearby Mokelumne River(located approximately 1-3/4 miles to the north). A regional geologic cross section of the San Joaquin Valley presented in the California Department of Water Resources Bulletin 146, shows the alluvial deposits are underlain by a relatively thick sequence of continental- derived sediments which include he Victor Formation (Pleistocene-age) and the Plio-Pleistocene Laguna y Formation (CDWR, 1967). The volcanic and volcaniclastic Mehrten Formation of Miocene to Pliocene-age underlies the Laguna Formation at a depth of approximately 800±feet. (by Harwood and Helley, 1982),showing depth to basement bedrock in the Sacrame Open Vallee Report s that bedrock beneath the project site is located at an elevation of approximate) 21400 meters -7,87pt*dicates that U.S.G.S. Water Resources Investigation Report 45feet -73 by R.W. Page (1974) shows that he base of the poste Eocene continental deposits lies at a depth of approximately 2,500 feet. In the Lodi area,ground water is located in the north-central portion of the Eastern San Joaquin County Ground Water Basin as shown in California Department of Water Resources Bulletin 118-8 (CDWR, 1980).-TheSan---- Joaquin Coun Ground Water-Basin-is traversed by-the Stanislaus River along the southern boundary of the basin,the Calaveras River and the Mokelumne River along the northern boundary of the basin,and several other smaller surface streams which drain in a westerly direction towards the San Joaquin River, which forms„the western boundary of the basin. The nearest major sources of ground-water recharge to the project site are the Dai Pont Environmental Services