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�. <br /> D <br /> ; <br /> The site is not secured by a fence, and a significant amount of <br /> vehicle traffic crosses the site to gain access from Hammer Lane <br /> to the shops behind the site. <br /> — Land use in the immediate area is primarily commercial (Figure <br /> 2 ) . A Shell service station with active underground tanks lies <br /> — across Sacramento Road to the east; a retail shopping center <br /> surrounds the back side of the former station to the north and <br /> west- <br /> j. <br /> The site of a former Knowles service station is approximately 200 <br /> i <br /> # yards west-southwest of Exxon RS 7-1050 on the southwest corner <br /> - of the intersection of Hammer Lane and Pacific Avenue. Under- <br /> ground tanks were once used to store gasoline at this station. <br /> Th,e' station building has been removed from the site. EA has <br /> obtained the 22 October 1986 report of asubsurface investigation <br /> conducted at the Knowles:station by Groundwater Technology, Inc. <br /> I (GTI } Water samples were obtained from three monitoring wells, <br /> ! all,of 'whichcontaineddetectable petroleum hydrocarbons ( 350-969. <br /> ug/kg) and detectable BTEX components (e.g. , 36-85 ug/kg benzene) <br /> �. <br /> (GTI' 1986c) . <br /> 1 .3 LOCAL HYDROGEOLOGY AND GROUNDWATER USE j <br /> 1 .3. 1 Regional H drogeology 1 <br /> J' The soil,;section: in the Stockton area 'consists of a thick <br /> _ <br /> sequence . n � lalluvial far, _river channel,_.-and. f.lood <br /> plaindeposits. Th are composed of interfingering ._._.. _.. _.. _._... <br /> ? <br /> i <br /> layers of gravels, sands, silts, .and clays (USGS . 1972 ) . Fresh <br /> g .-oundwater is abundant in unconsolidated sediments (DWR 1967 ) ; <br /> and is recharged from the Sierra. Nevada to the east Relatively i <br /> saline waters recharge and intrude. upon these better-quality <br /> aquifers from the Coast ranges and 'the Delta in the west. The <br /> layers of unconsolidated sediments differ widely in thickness and <br /> extent <br /> e25/71050/8-89/txt 2 <br /> i ' . <br />