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TANK CLOSURE REPORT <br /> 2320 El Dorado, Stockton, CA <br /> Aegis Project No. 89-049 <br /> Page 1 <br /> 1.0 INTRODUCTION <br /> Aegis Environmental Consultants, Inc. (Aegis) presents this tank <br /> closure report for the Shell oil Company (Shell) retail gasoline <br /> station located at 2320 E1 Dorado, Stockton, San Joaquin County, <br /> California (Site, figure 1) . <br /> 1. 1 Purpose <br /> The purpose of this report is to: <br /> o Provide agencies with information acquired during the tank <br /> closure/new tank replacement construction activities. <br /> o Present results of work addressed to assessing the feasibility of <br /> remediating soils containing petroleum hydrocarbons on-site by <br /> over-excavation or vapor extraction, in and below the storage <br /> tank system piping corridors. <br /> o Evaluate the need for further assessment and /or mitigation of <br /> petroleum constituents in soil and ground water beneath the Site. <br /> 1.2 Work Performed <br /> o Sampled the stockpiled soils excavated from the top of the <br /> existing product tanks and product line trenches per San Joaquin <br /> County's Environmental Health Division's requirements. <br /> o Obtained samples from soil beneath the existing underground <br /> storage tanks and product piping according to the Tri-Regional <br /> Guidelines: Regional Board Staff Recommendations for Initial <br /> Evaluation and Investigation of Underground Tanks and under the <br /> direction of a representative from the San Joaquin County' s <br /> Environmental Health Division. <br /> o Submitted the soil samples to a state-certified laboratory for <br /> analysis of petroleum hydrocarbons according to the methods <br /> described in Section 7 . 0. Performed the required analytical <br /> evaluations according to San Joaquin County's Environmental <br /> Health Division's requirements. <br /> o Permitted the disposal of stockpile soil to West Contra Costa <br /> County Sanitary Landfill through the Richmond Sanitation <br /> District. <br /> i <br />