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4 <br /> e <br /> %^p <br /> Ld <br /> ff <br /> AR <br /> r"\ <br /> 2.3 Topography, geology, hydrology <br /> The prof art of the large northwest <br /> project site is s' art <br /> level terrain at thentral Valley southern <br /> end of the Sacramento trough termed the s athj.cic sequence <br /> trending sedimentary contains a <br /> Places- <br /> California- The Sacramento Valley <br /> Ca sediments which reach a depth of 10 miles in some places. <br /> These sediments range in geologic age <br /> from surassic to <br /> both marine and continental deposits' <br /> Holocene and include <br /> irregularly interbedded and <br /> ived gfrom flood and over an <br /> Near surface deposits are der <br /> river deposits consisting of coarse grained unconsolidated <br /> discontinuous layers of fine to <br /> sediments. <br /> er <br /> The closest surface water to <br /> the site is the San Joaquin <br /> River, approximately an-hal£ mile to to etheu nha thwesth and vis <br /> location flows generally conal groundwater flaw <br /> in this g• The reg' <br /> subject to periodic flooding. First groundwater• beneath the <br /> northeast- 12-15 feet below <br /> is generally to theedepth o£ approximately <br /> site occurs at a <br /> grade. wells: <br /> 2.4 Proximity <br /> of rivate, municipal and irrigation <br /> locations within a one mile radius are located on <br /> Known we are no known wells on -Che project site• <br /> There stems exist on the site. The <br /> Figure wells used in <br /> Also, no dry wells or septic systems As <br /> groundwater monitoringra erties. <br /> nearest wells are shallow 9 investig ations at nearby P p <br /> petroleum hydrocarbo Laidlaw projeCt, these wells are screened <br /> in the case with the zone and, therefore, <br /> only in the uppermost water bearing <br /> not considered potential conduits for contaminant migration. <br /> 3,0 METHODS AND pROCEDURES <br /> 3.1 Excavation the <br /> material associated with to <br /> To prevent the <br /> contaminate e,enting a continued threat <br /> former xylene tank from p yards of contaminated <br /> groundwater, approximately 7, cubic y <br /> ted from the project site' The location of <br /> soils were excavated <br /> on Figure 2'_—..>> <br /> the excavation is except where <br /> ,cavateAll xylene contaminated soils were e The excavatondwas limited an <br /> barriers prohibited- the warehouse and access <br /> physical the tank pit by 15 feet <br /> the west side of roximately <br /> ramp. Groundwater was encount n. SoilsAW thin the saturated <br /> below grade during the excavation• les were <br /> zone v:ere not excavated. Verification soil camp <br /> 2 <br /> LCR0510'WP <br />