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R10/71-51-IC <br /> 2.0 [INTRODUCTION AND PROJECT DESCRIPTION <br /> This report for Site Investigation (SI) of Shop 10 (hereinafter referred to as Shop 10)-- an <br /> equipment and maintenance facility of Caltran's District 10 Headquarters complex, was <br /> prepared under the Caltrans Statewide Contract Number 53U495, under Task Order <br /> Number 10-365101-01 by Environmental Assessors, Inc (EA) An SI was conducted to <br /> determine the horizontal and vertical extent of hydrocarbon contamination of the soil and <br /> groundwater The soil and groundwater hydrocarbon contamination was first <br /> discovered in 1987 resulting in the removal in 1989 of the four 5,000-gallon underground <br /> fuel tanks The four underground fuel tanks and piping systems used to be a part of the <br /> fueling facility of Shop 10 A 1,000-gallon waste oil tank was also removed in 1989 The <br /> potential for hydrocarbon contamination also exists in and around the washracks, the <br /> location of the waste oil tank, and shop building The SI was designed to arrive at a final <br /> evaluation and characterization of all hazardous waste issues on the site as required by <br /> the Caltrans Potential contaminants are related primarily to petroleum materials and <br /> wastes associated with fueling and servicing of vehicles and equipment used in the <br /> highway maintenance Contaminants of concern are diesel, gasoline, BTX & E and <br /> halogenated hydrocarbons, oil and grease, PCBs, and chromium Corollary to the <br /> Caltrans task requirement is the formulation of a remedial action plan concept that will <br /> satisfy the county and state regulatory requirements for clean-up of the site <br /> i <br /> i <br /> 6 <br />