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. k4.KLEINFELDM <br /> `- 3 BACKGROUND <br /> The Disco Remediation Area is the site of a' former gasoline service station located on the <br /> southern portion of the Del Monte site. The Disco Remediation Area was operated as a service <br /> station until the property was purchased by Del Monte in 1976. Del Monte never.operated the <br /> service station. <br /> Three 10,000 gallon underground storage tanks (USTs) were identified on the Disco. site. The <br /> USTs were removed in 1985. During the removal of the USTs impacts to soil beneath the tanks <br /> was noted. The soil was excavated and aerated on the site and backfilled into the excavation. In <br /> 1991, a soil and groundwater investigation began. That investigation included a soil gas survey, <br /> seven soil borings, and installation of eight monitoring wells. The results showed concentrations <br /> of Total Petroleum Hydrocarbon as gasoline (TPH-g) in the soil at depths ranging from 55 feet <br /> below the ground surface (bgs) to 75 feet bgs, and also in the groundwater. <br /> I <br /> In February 1995, a soil vapor extraction and air sparging system (SVE/AS) was installed and <br /> operated (CH2M Hill, 1995) at the site. An estimated 8,787 pounds of TPH-g was removed <br /> while the system was in operation up to November 1995. The SVE/AS was shut down due to <br /> rising groundwater levels above the SVE systems screened level, caused primarily by the <br /> shutdown of not only three Del Monte production wells, but also reportedly due to the shut down <br /> of numerous city municipal wells in the area. <br /> The main contaminants are TPH-g, benzene, toluene, ethylbenzene, xylene; and 1,2-DCA. The <br /> site is cuirently.being monitored on a quarterly basis. <br /> I <br /> i <br /> l <br /> 12280.MON/ST03R524 Page 5 of 12 <br /> 0 2003,Kleinfelder,Inc May b,2003 <br />