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t' Introduction <br />On behalf of SBC, Shaw Environmental, Inc. (Shaw) was contracted to provide environmental <br />consulting services during the removal of one 500 -gallon diesel underground storage tank (UST) <br />and associated piping from the SBC facility located at 1812 Coley Avenue in Escalon, California <br />(Figure 1). SBC's construction management contractor, Kleeman Roebbelen, subcontracted <br />Gettler-Ryan, Inc. (Gettler-Ryan) to provide and operate equipment to perform the UST removal. <br />TAIT & Associates, Inc. (TAIT) was contracted to provide engineering and permitting services. <br />UST removal work discussed in this report was completed in compliance with local and state <br />regulatory requirements in April 2004. <br />1.1 Site Description <br />The SBC property is located in a mixed residential, commercial, and light industrial area of <br />Escalon, California. A one-story building used for housing telecommunications equipment and <br />offices occupies the center portion of the site (Figure 2). South of the building was a 500 -gallon <br />diesel UST used for the fueling the on-site emergency backup generator. As part of SBC's UST <br />up -grade program, the UST was scheduled for removal and replacement with a new 1,000 -gallon <br />diesel UST to be installed in the same excavation. <br />1.2 Permits <br />Prior to initiation of excavation activities, TAIT obtained permits for the tank removal and <br />installation from the San Joaquin County — Environmental Health Department (SJC-EHD). <br />Copies of the permits are included in Appendix A. Prior to removal of the tank, a representative <br />of the SJC-EHD was scheduled to observe the tank removal activities. <br />2.0 UST Removal <br />On April 8, 2004, Gettler-Ryan personnel began excavation activities with the removal of the pea <br />gravel fill material around the tank. The excavated fill was directly loaded into trucks to be <br />hauled to a disposal facility. The UST was triple rinsed by Ecology Control Industries (ECI) <br />personnel using a fresh water/detergent mixture and a hot water pressure washer. The tank's <br />contents (diesel fuel) had been removed prior to rinsing activities. Following rinsing, visual <br />inspection of the tank did not indicate any residual sludge or liquid on the visible portions of the <br />CNCD\0:SHARE\USW4-0097.doc <br />