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1 <br /> Two appendices are attached to this report Appendix A contains the <br />' PHS/EHD checklist for site closure This checklist references the section <br /> of this report where the required data can be found Appendix B presents <br /> the mass calculation information that documents the estimated amount of <br />' residual gasoline remaining in soil and ground water at the site <br />' 1.2 SITE LOCATIDNAND HISTORY <br />' The site is located at 936 East Weber Avenue in Stockton, California <br /> (Figure 2) and is an approximately 1-acre parcel of land in an industrial <br /> portion of Stockton The land has been used primarily for railroad <br /> operations, associated dwellings, and various commercial activities <br /> (Espana, 1997) The site was redeveloped into a parking lot for the San <br />' Joaquin Rail Commission The majority of the site is paved except for a <br /> small band of landscaped area around the perimeter of the parking lot <br /> Three soil and ground water investigations have been performed at the site <br /> since 1997 Soil borings and monitoring well locations are shown in <br /> Figure 2, Section 2 0 presents the investigation results <br /> 1.3 GEOLOGIC SETTING <br /> The property lies within the Great Valley geomorphic province of <br />' California The Valley is an asymmetric synchnorxum containing up to <br /> 60,000 feet of sediment along the western margin The sediments consist of <br /> marine and non-marine late Triassic to early Tertiary clastic material Late <br />' Tertiary to Present Age sediments are exclusively of non-marine clastic <br /> deposition in a variety of alluvial-fluvial environments The present day <br /> surface outcrop of geologic units in the Stockton area reflects the Late <br />' Tertiary alluvial valley fill derived from an active river system The fill <br /> probably extends to a depth of several hundred feet <br />' Site-specific geologic information for the vicinity of the property is based <br /> on the stratigraphy encountered during investigations of the former tank <br />' site The soil consists primarily of silty clays ranging from ground surface <br /> to 30 feet below ground surface (bgs) and silty sands ranging from 30 to <br /> 40 feet bgs Geologic cross sections for the site are shown in Figures 3 <br /> and 4 <br /> ERM 2 9343 50/UPRR/11/06/02 <br />