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Tri-Regional Recommendations for closure of underground tank sates This checklist references the section of this report where the required data can be found Much of the required data have been provided an reports and other documents previously submitted to PHS/EHD To facilitate ' PHS/EHD review of this closure report, Appendix B contains figures and selected text excerpted from these previous reports Mass calculation information as presented in Appendix C 12 SITE LOCATION AND HISTORY ' The property as situated within an industrial setting, an the port area of the City of Stockton, San Joaquin County, California (Figure 1) The Stockton Deep Water Channel bounds the property immediately to the north Ground surface elevations range from a few feet above mean sea level along the Stockton Channel waterfront to approximately 10 feet above mean sea level along West Weber Avenue ' Limited historical information as available for theP p Y ro ert The earliest record, circa 1917, indicates that the area was a rail yard owned by the Atchison, Topeka, and Santa Fe Railroad By 1963, the rail yard had been replaced by warehouses The warehouses at Former Tank Sates #1 and #2 were demolished an 1998 ' 13 GEOLOGIC SETTING The property lies within the Great Valley geomorphic province of California The Valley as an asymmetric synclinorium containing up to 60,000 feet of sediment along the western margin The sediments consist of marine and non-marine late Triassic to early Tertiary clastic material Late Tertiary to Present Age sediments are exclusively of non-marine clastic deposition an a variety of alluvial-fluvial environments The ' present day surface outcrop of geologic units an the Stockton area reflects the Late Tertiary alluvial valley fill derived from the San Joaquin Raver The fall probably extends to a depth of several hundred feet Site-specific geologic information an the vicinity of the propertyas based on the stratigraphy that was encountered during investigations of the former tank sates Three general soil types were encountered The first layer (encountered only at Site #2) as a than layer of fill ranging from the ground surface to 2 to 3 feet below ground surface (bgs) The second layer, semi-consolidated salts and clays, as found directly below the pavement at Site #1 and below the fill at Site #2 and ranges to between approximately 10 and 20 feet bgs Below the clay/silt layer and to the ERM 6 CATELLUS/2996 10-10/13/99