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F <br /> C <br /> e <br /> /-n <br /> f <br /> Aopiied GwSystems 4191-E Power Inn Road, Sacramento,CA 95626 0161 452.2901 <br /> • FREMONT a IRVINE a HOUSTON e "BOSTON s SACRAMENTO a CULVER CITY a SAN j()SEE <br /> r , May 3, 1989 <br /> AGS 38053-2 <br /> Mr. Gary Brophy <br /> 1235 Slayton Drive <br /> Manteca, California 95336 <br /> Subject: Work Plan for re-excavation of former tank cavity and <br /> soil sampling at former Texaco Service Station, 941 <br /> East Yosemite Avenue, Manteca, California. <br /> Mr. Brophy: <br /> At your request, Applied GeoSystems has prepared this Work Plan <br /> which presents procedures for: 1) removal of underground product- <br /> delivery lines and soil sampling; 2) evaluating and removing soil <br /> contamination from the former location of the underground storage <br /> tanks and possibly beneath the removed underground product- <br /> delivery lines, and 3) characterizing the stockpiled soil to <br /> evaluate possible remedial alternatives at the former Texaco <br /> Service Station located at 941 East Yosemite Avenue in Manteca, <br /> California. <br /> Previous work at the site included removal of four underground <br /> r, gasoline-storage tanks and one waste-oil tank on February 11, <br /> 1988, by Jim Thorpe Oil, Inc. , of Lodi, California. Canonie <br /> Environmental Services Corporation, of Stockton, California, was <br /> onsite to collect soil samples from beneath the tanks. According <br /> to Canonie Environmental Services' Laboratory Report No. 85-052- <br /> 3580, soil samples were collected from approximate depths of 11 <br /> feet below grade beneath the gasoline tanks and 7 feet below <br /> grade beneath the waste--oil tank. Results of laboratory analyses <br /> performed by Canonie Environmental Services indicated <br /> contamination in the soil beneath the gasoline tanks at <br /> concentrations of total petroleum hydrocarbons (TPH) as gasoline <br /> ranging from 5.1 to 100 parts per million (ppm) and total <br /> extractable hydrocarbons at 5,300 ppm. No soil contamination <br /> above detectable concentrations were noted beneath the waste-oil <br /> tank. It is our understanding that the gasoline tank cavity was <br /> excavated further to attempt to remove the contamination, and <br /> Canonie Environmental Services collected a soil sample from <br /> approximately_l8 feet below grade._ Results of laborabory_T <br /> analyses of this soil sample presented in Canonie Laboratory <br /> Report No. 85-052-3776 indicated total volatile hydrocarbons at a <br />