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r <br /> ?f <br /> 3 Fi <br /> 1.0 INTRODUCTION <br /> The subject site is located at 13521 Fast Mariposa Road ill the City of Stockton in <br /> San Joaquin County, California (see Figure 1). On November 27, 1991, AAA 'Tank <br /> Removal Service removed one 4,000 gallon, underground, gasoline storm tank, <br /> Chemical analyses of soil samples [4,000 North and 4,000 South (see Figure 2)] <br /> collected from native soil during removal of the tank detected total petroleum <br /> hydrocarbons as gasoline (TPHG) at concentrations up to 2,900 parts per million (ppm) <br /> and benzene, toluene, ethylbenzene, and xylenes at concentrations up to 16 ppm, 200 <br /> ppm, 130 ppm, and 830 ppm, respectively; total lead was detected at concentrations <br /> up to 15 ppm, and ethylene dibromide (EDB) was detected in sample 4,000-Nortlt at <br /> concentrations of .099 ppm (see Table 1 and a certified analytical report and chain-of- <br /> custody in Appendix A). Also, work conducted by Uriah Inc. (Uriah) on January 2, <br /> 1991 documented an area of native soil contamination adjacent to the location of the <br /> former dispenser island; Uriah's sample EC-15 (see Uriah's March 14, 1991 Interim <br /> Report) detected TPHG at a concentration of 920 ppm and benzene, toluene, <br /> ethylbenzene, and xylenes at concentrations of 3.0 ppm, 36 ppm, 14 ppm, and 85 ppm, <br /> respectively. <br /> This report proposes a workplan (1) to investigate and remediate (within limits <br /> discussed below) the horizontal and vertical extent of contaminated vauose zone soil <br /> in the i of the removed 4,000-gallon, underground, N6 tank by excavation and (2) <br /> to investigate soil contamination near the former pump island by drilling a soil boring <br /> and collecting soil samples for chemical analyses. <br /> 2.0 PROPOSED REMEDIAL INVESTIGATION AND REMEDIATION OF <br /> CONTAMINATED SOIL AND DRILLING AND SAMPLING ONE SOIL <br /> BORING <br /> Because soil samples collected during tank removal in native soil beneath the 4,000- <br /> ank detected TPI1G at concentrations up to 2,900 ppm <br /> gallon, underground, gasoline t <br /> and Uriah detected TPHG at a concentration of 920 ppm in native soil near the <br /> location of the former dispensers, the site owner, Sami M. Ayesh [Ayesh (telephone <br /> no. 209 465-7320)] contracted with Tank Protect Engineering (TPE) to conduct <br /> • _�� 1 <br /> `w4 <br /> 4E <br />