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Work Plan for Re-excavation May 3, 1989 <br /> Former Texaco Service Station, Manteca, California AGS 38053-1 <br /> (TPH) as gasoline ranging from 5.1 to 100 parts per million (ppm) <br /> and total extractable hydrocarbons at 5,300 ppm. No soil <br /> contamination was detected below the waste-oil tank. <br /> In an effort to remove the contamination, the gasoline tank <br /> cavity was further excavated, and Canonie Environmental Services <br /> collected a soil sample from approximately 18 feet below grade. <br /> Ground water entered the excavation and a ground--water sa•�ple was <br /> collected from the base of the tank cavity at approximately 20 <br /> feet below grade. Laboratory analytical results of the soil <br /> sample collected were presented in Canonie Laboratory Report No. <br /> ' 85-052-3776 and revealed total volatile hydrjac&r- pm. <br /> and total lead at 29.5 ppm. Analytical results of the ground- <br /> water sample showed levels of total xylene isomers at 0.63-ppm <br /> which is in excess of the allowable concentration (0.62-ppm) <br /> recommended by the California Department of Health Services <br /> (DHS) . The tank cavity was backfilled with the ex aced soil at <br /> a later date. <br /> On October 24 and 25, 1988, a geologist from Applied GeoSystems <br /> d visited the site to observe drilling of three soil borings, <br /> installation of monitoring wells in each boring, collect soil <br /> samples, and evaluate the soil for subjective evidence of <br /> 4 <br /> Apjal ad 4900SYS ems <br />