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• Section 5 discusses the risk and future uses of the former tank sites <br /> • Section 6 presents recommendations for closure of the former tank <br /> sites <br /> • Well abandonment is discussed in Section 7 <br />' • References cited in the report are included in Section 8 <br /> • Appendix A contains the PHS/EHD checklist for site closure, which is <br />' consistent with the Tri-Regional Recommendations for closure of UST <br /> sites This checklist references the section of this report where the <br /> required data can be found <br /> • Calculations performed to determine the mass of chemicals removed <br /> t and remaining at the former tank sites are presented in Appendix B <br /> • Appendix C discusses the results of sampling performed to determine <br /> the bioremediation capacity of the ground water at each former tank <br />' site <br /> 1.2 SITE LOCATION AND HISTORY <br /> The site is located at 757 Eleventh Street, near the intersection of Eleventh <br /> Street and MacArthur Drive, in Tracy, California (see Figure 1) The site is <br /> located within a primarily commercial/industrial area on the southeast <br />' side of the city of Tracy The former Heinz facility produced tomato food <br /> products from the time of construction in 1946 until decommissioning and <br /> sale in 1998 In 1998, the facility was purchased by the Cranbrook Group <br />' and is currently leased as warehouse space <br />' 1.3 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 <br /> of marine and non-marine, late Triassic to early Tertiary clastic material <br /> Late Tertiary to present age sediments are exclusively of non-marine <br />' clastic deposition in a variety of alluvial-fluvial environments <br /> Site-specific geologic information for the vicinity of the property is based <br /> on the stratigraphy that was encountered during investigations of the <br /> former tank sites Three general soil types were encountered The first <br /> layer is a thin layer of fill ranging from the ground surface to 1 to 2 feet <br /> below ground surface (bgs) The second layer, semi-consolidated silts <br />' ERM 2 HEINZ USA 3374 60.3/27/00 <br />