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kn KLEINFELDER <br /> 3 BACKGROUND <br /> f <br /> E <br /> r <br /> 1 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 /> In February 1995, a soil vapor extraction and air sparging system (SVEIAS) 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 SVEIAS 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 /> t <br /> c The main contaminants are TPH-g, benzene, toluene, ethylbenzene, xylene, and 1,2-DCA. The <br /> ` site is currently being monitored on a quarterly basis. <br /> l <br /> t <br /> I . <br /> 12280-MON/ST02R134 Page 5 of 14 <br /> ©2002,Kleinfelder,Inc July 26,2002 <br />