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s LEVI N E•FRICKE April 3 , 1991 LF 1396 FORK PLAN FOR INVESTIGATION TO ASSESS REMEDIATION OF PETROLEUM-AFFECTED SOILS SUNBORO DEVELOPMENT CORPORATION, PARCEL B TRACY, CALIFORNIA INTRODUCTION This Work Plan is in response to the request by Sunboro Development Corporation ("Sunboro") on October 5, 1990 for services related to petroleum-affected soils on their Parcel B. Parcel B is located southwest of the intersection of Byron and Corral Hollow Roads in Tracy, California ("the Site" ; see Figure 1) . OBJECTIVE The objective of the services described below is to provide cost estimates for the remediation of the petroleum-affected soils at the Site'. To provide these costs estimates, the volume of petroleum-affected soil will be better assessed. The unit soil treatment cost and the cost to mitigate further petroleum migration as to the Site will be evaluated. BACKGROUND In April 1988, petroleum compounds were encountered in site soils along Byron Road during the installation of a City of Tracy water pipeline across the Site. A subsequent investigation by Terrestrial Technology Incorporated (TTI) confirmed the existence of the compounds. The TTI investigation (1988) included drilling a row of nine soil borings about 125 feet south of Byron Road and drilling three soil borings in the vicinity of the City water pipeline (Figure 2) . The TTI investigation did not detect petroleum in the nine borings 125 feet south of Byron Road or in the borings located 28 and 53 feet south of Byron Road. However, petroleum hydrocarbons were detected in a soil sample collected from the boring located 11 feet south of Byron Road at a depth of 6 feet. Although the source of petroleum hydrocarbons in site soils was not identified in the TTI report, TTI noted that petroleum-affected soils were also encountered under the railroad right-of-way (adjacent to a petroleum pipeline) immediately north of Byron Road. f