ARCHIVED REPORTS XR0009309 - Laserfiche WebLink

Home Browse Search

i Reference— Quarterly Monitoring Report Dated 11/12/2001 Q3, 2001 • 10 Reference— Quarterly Monitoring Report Dated 02/05/2002 Q4, 2001 Ii1 Reference— Quarterly Monitoring Report Dated 05/05/2002 Q 1, 2002 ' 12 Reference--- Quarterly Monitoring Report Dated 08/08/2002 Q2, 2002 13 Reference— Quarterly Monitoring Report Dated 10/26/2002 Q3, 2002 ' 14 Reference-- Quarterly Monitoring Report Dated 04/09/03 Q 1, 2003 CTL contracted EI to complete the required Quarterly Monitoring Report for the Site at 3105 ' South El Dorado Street, Stockton The location is shown in Figures 1 and 2 This Quarterly Monitoring Report summarizes the groundwater monitoring activities completed ' at the site on 06/21/03 2.0 Site Description ' The subject site is located in the southern part of the City of Stockton, California(Figures 1 and 2) The site is an essentially level commercial trucking facility, which contains an office ' building, two truck maintenance shops, a truck-washing facility, a small above-ground storage tank compound, a vehicle fueling facility and a large parking area for tank trailers ' 3.0 Geologic Conditions The site is situated in the northern part of the San Joaquin Valley, in an area underlain by ' several thousand feet of terrestrial and marine sedimentary rocks The northern San Joaquin Valley has been a lowland area subject to marine intrusion, flooding and incremental sedimentation for millions of years The uppermost 1000 feet of sedimentary strata consist of ' Holocene, Pleistocene and Pliocene sediments, including the Laguna Formation, the Mehrten Formation and the Valley Spring Formation The sediments are interbedded mixed-fluvial and deltaic sediments, dominated by medium-grained sand and silts Generally, thin beds of unconsolidated clayey silt, silty clay and sandy clay are abundant in this upper zone, which are ' laterally discontinuous over distances of several tens of feet 4.0 Hydrogeologic Conditions Groundwater is present beneath the site at a depth of 32 40, 32 70, 32 29 and 31 89 feet below ' top of casing(btc), as measured on 06/21/03 in the four groundwater monitoring wells (MW-1, MW-2, MW-3 and MW-4 respectively) installed on site The elevation of groundwater in MW- 1, MW-2, MW-3 and MW-4 was calculated by El to be at 19 38, 19 28, 19 45 and 19 54 feet below mean sea level respectively, based upon casing elevation data from Kier & Wright Civil ' Engineers and Surveyors I F � 4 ' 4