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Two appendices are attached to this report Appendix A contains the <br /> PHS/EHD checklist for site closure This checklist references the section <br /> Sof 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 /> 12 SITE LOCATION AND 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 Iocations are shown in <br />' Figure 2 Section 2 0 presents the investigation results <br />'. 13 GEOLOGIC SETTING <br /> The property lies within the Great Valley geomorphic province of <br /> California The Valley is an asymmetric synclinorium containing up to <br /> 60,000 feet of sediment along the western margin The sediments consist of <br /> marine and non-marme 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 /> p �' <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 /> FRM 2 9343 50/UPRIZ/02/33/03 <br />