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j I <br /> Maker ermmma am, - saa P eo 145 seam SUW most normal causears <br /> BACKGROUND <br /> 5) Thfec 800 gallon saM cued USTs (unwwwn use). <br /> Details of the gasoline service station history or prior use of the land is not available. The I ISA <br /> was building was constructed during the Fare leads and early 19pre following the removal of the <br /> USTs. <br /> 2.2 ENVIRONMENTAL SETTING <br /> Information regarding the envimnmcntal setting is presented in the subsections below. <br /> 2.2.1 Regional Geology <br /> The following information is from the Department of Water Resources (DWR) Coilmno's <br /> Groundwater Bulletin 118, San Joaquin Valley Groundwater Basin, Ensure San Joaquin Subbasin <br /> Groundwater Basin Number. 5-M.01 updated in 2006. <br /> The Site is knotal in the fordern San Joaquin Subbasin and is Joined by the San Joaquin River <br /> and several of its major Iribumnes namely, the Stamslaus, Calavems, and Mokclumne Rivers. q'he <br /> San Joaquin River [lows northward into the Sacramento and San Joaquin Delta and discharges into <br /> Fee San presence Bay. Water-bearing Formations of significance in the P stern San Joaquin <br /> Sublamin consist of tire Alluvium and ModersoMiverbank Formations, Flood Basin Deposits, <br /> Laguna Formation, and Metre" Formation. Tire Mchrten Formation is considered to be the oldest <br /> fresh water-bearing formation on the east side of the basin, even though the underlying Valley <br /> Springs Formation produces minor quantities of water. <br /> Alluvium and ModerkaRiverhank Formulates (Undifferentiated). Them none are exposed <br /> within the sub-basin along a hand approximately 15 miles wideflatexlends from about Stockton <br /> eastward. These units are Recent to Late Pleistocene in age and consist primarily of sand and <br /> gavel in the f areas while clay, silt, and sand are dominant in the inter-fan areas. These <br /> units range in thickness from a thin veneer on the east side ofthe basin to over 150 feet rom the <br /> center of the basin. Groundwater occurs unconfined within these units. Because these units arc <br /> limited in t1driorss, most wells penetmre them in order to lop deeper numbers in the area. <br />