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1 <br />' 1.0 Introduction _ <br /> • On behalf of SBC, Shaw Environmental, Inc (Shaw) has prepared this Request for No Further <br /> Acton for the SBC facility located at 10 East 12'h Street in Tracy, California (Figure 1) The <br /> following report summarizes previous work, and soil and groundwater analytical results <br />' associated with the site, and recommends case closure This report was prepared in accordance <br /> with the Draft Tri-Regional Board Staff Recommendations for Preliminary Investigations and <br /> Evaluation of Underground Storage Tank Sites dated March 1, 1994 (RWQCB, 1994) A copy <br /> of Table 1 —Checklist for No Further Action Requests at Underground Storage Tank Sites is <br />' included to Appendix A <br /> 2.0 Site Description <br /> The SBC facility occupies approximately 0 8 acres and is located in a predominately residential <br /> and commercial part of Tracy, California The prominent site feature is a single-story building <br />' housing telecommunications switching equipment and offices on the western and southern <br /> portion of the site The remainder of the site is paved with asphalt and used for the parking of <br />' SBC fleet vehicles (Figure 2) An 8,000-gallon underground storage tank (UST) containing <br /> diesel fuel for an emergency backup generator is located in the eastern portion of the site <br /> Groundwater has been encountered at the site at depths ranging from 9 29 feet to 14 feet below <br />' surface grade (bsg) Data from groundwater monitoring programs conducted on nearby <br /> properties and at the site indicates the groundwater gradient is generally directed to the north <br /> 3.0 Previous Investigative Work <br />' In February 2002, a 500-gallon heating oil UST was encountered on the southeastern portion of <br /> the site during grading The age of this UST is unknown, however, it is believed the UST was <br /> used to supply fuel for the heating system of a former residential structure on the site, hence tank <br />' installation likely occurred one-half century or more ago This UST was removed in early 2002 <br /> No petroleum hydrocarbon analytes were detected in a soil sample collected from the base of the <br /> UST excavation (IT Corporation [IT], 2002a) Approximately 31 cubic yards of fill material <br /> generated during removal activities were transported off-site for disposal Soil sample analytical <br /> results are summarized in Table 1 and depicted in Figure 3 <br /> • CNCDISHARE\USl104-0001 doc 1 <br />