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Phase I Environmental Site Assessment Project#:99-1261 Proposed AutoZone Site,Manteca.California February 19, 1999 Page 6 beneath the southern portion of the site, once believed to have been the location of an underground storage tank, had been adversely impacted with petroleum hydrocarbons. Since February 10, 1994 a soil vapor extraction system (SVE) and a groundwater recovery system have been in operation on the site to remove the contamination from the subsurface. It has been reported that as of November 30, 1998, more than three-million-five-hundred-thousand gallons of contaminated groundwater has been recovered and treated and that twenty-two-million cubic feet of contaminated soil vapors have been removed from the subsurface. According to ATC Associates,Inc.,the contaminants beneath the site have been reduced by eighty- five to ninety-five percent. Upon review of the reports supplied by Mr. Michelson, it appears that the limits.of the groundwater contamination, associated with this unauthorized release has been determined to the north of the site. Samples obtained from a single groundwater well located up-gradient from the unauthorized release and between the release and the subject site indicate that the groundwater aversely impacted with petroleum hydrocarbons has not migrated onto the subject site - the portion of the parcel under investigation. Current Property Use Currently,there are no permanent structures on the subject site, however, the site is being utilized by a mobile restaurant - Tacos Cotija. Tacos Cotija has set up operations on the eastern portion of the subject site, fronting Main Street. Water and electrical services are currently being provided to Tacos Cotija by the Firestone Tire Center on the adjacent property to the north. Associated with the mobile restaurant are several picnic tables. Past Property Use As evident in the site reconnaissance and the records search, the subject site was utilized as a retail lumber yard from the early 1930's through the mid 1990's. In the mid 1990's the storage areas on the subject site were dismantled and the subject site vacated. I Current and Past Use of Adjoining Properties The subject site is bounded by South Main Street to the east, Firestone Tires - Los Amigas Tire Service(123 South Main Street) to the north, Maple Street to the east, and Don's Mobile Glass (151 South Main Street) to the south (see Figure No. Ic, Site Map). To the east, directly across Main Street from the subject site is the Save $ Market (grocery store) and the parking lot for a Bank of America. To the west, directly across Maple Street from the site is a Public Parking Lot.