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Site Safety and Health Plan <br /> Site Contamination Work Plan,ABF Freight Systems,Inc <br /> 2427 West Yosemite A-,enue,Manteca,California F Freight System,Inc <br /> . Manteca,California Page 5 <br /> 20 SITE INFORMATION <br /> 2.1 Site Description <br /> The ABF Freight System, Inc site is located off Highway 120 at 2427 West Yosemite Ave in <br /> Manteca, California The site consists of a main freight terminal and office, truck parking, a <br /> former diesel fuel dispenser island, and former 10,000 gallon diesel UST site The layout of the <br /> former tanks is shown on the drawings in Attachment 1 <br /> 2.2 Site Map(s) <br /> See Attachment I for site maps and general directions to the site <br /> 2.3 Background Information <br /> One 10,000 gallon underground storage tank (UST) was removed on 3/18/98 under supervision <br /> of Mr Michael Kith of the San Joaquin County Department of Environmental Health The Total <br /> depth of the UST excavation was 11 feet and groundwater was encountered at approximately 10 <br /> feet, 4 inches During excavation and after the UST was removed from the excavation stained <br /> • soils indicating diesel contamination was observed in the base of the excavation Soil samples <br /> collected from the excavation stockpile and groundwater sampled from the excavation confirmed <br /> diesel contamination A 6,000 gallon UST containing gasoline was removed from the site in <br /> 1986 No soil or groundwater contamination was found during the 6,000 gallon UST removal <br /> 2.4 Description of Operable Units (OUs) <br /> The operable unit concept is useful for co-located facilities that have different contaminants, <br /> large sites, and sites having complex contamination from multiple sources For remedial <br /> investigation and risk assessment purposes, it may be useful to divide a site into operable units <br /> based upon consideration of <br /> • the location of high priority stations, <br /> • the chemicals of concern, <br /> • the potential environmental transport pathways, and <br /> • the potential future uses of the land <br /> Is the "operable unit" concept applicable to this site9 No <br /> N 1PR0jFCTS132721P1ans and Reports\Drilling SSHP 2 doe May G, 1998 <br />