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g Reference— Quarterly Monitoring Report Dated 11/12/2001 Q3, 2001 <br /> CTL contracted EI to complete the required Quarterly Monitoring Report for the Site at 3105 <br /> i <br /> South El Dorado Street, Stockton The location is shown in Figures 1 and 2 <br /> Thisu <br /> Q arterly Monitoring Report summarizes the groundwater monitoring activities completed <br /> at the site on 27 December 2001 <br /> 20 SITE DESCRIPTION <br />' The subject site is located in the southern part of the Ci of Stockton California (Figures 1 and <br /> City { g <br />' 2) The site is an essentially level commercial trucking facility, which contains an office <br /> building, two truck maintenance shops, a truck-washing facility, a small above-ground storage <br />' tank compound, a vehicle fueling facility and a large parking area for tank trailers <br />' 2.9 Geologic Conditions <br /> The site is situated in the northern part of the San Joaquin Valley, in an area underlain by several <br />' thousand feet of terrestrial and marine sedimentary rocks The northern San Joaquin Valley has <br /> been a lowland area subject to marine intrusion, flooding and incremental sedimentation for <br /> millions of years The uppermost 1000 feet of sedimentary strata consist of Holocene, <br /> Pleistocene and Pliocene sediments, including the Laguna Formation, the Mehrten Formation <br /> and the Valley Spring Formation The sediments are interbedded mixed-fluvial and deltaic <br /> sediments, dominated by medium-grained sand and silts Generally, thin beds of unconsolidated <br /> clayey silt, silty clay and sandy clay are abundant in this upper zone, which are laterally <br /> discontinuous over distances of several tens of feet <br /> 2 2 Hydrogeologic Conditions <br /> Groundwater is present beneath the site at a depth of 30 68, 30 90, 30 60 and 30 10 feet below <br /> top of casing (btc), as measured on 27 December 2001 in the four groundwater monitoring wells <br /> (MW-1, MW-2, MW-3 and MW-4 respectively) installed on site The elevation of groundwater <br />' in MW-1, MW-2, MW-3 and MW-4 was calculated by EI to be at 17 66, 17 48, 17 76 and 17 75 <br /> feet below mean sea level respectively, based upon casing elevation data from Kier & Wright <br /> Civil Engineers and Surveyors <br /> Envtroneering,Inc Project No 02-001014 Page 2 <br />