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r� mks O Tbuchstone = Developments Environmental Management April 8, 1993 Chevron U. S.A. 2410 Camino Ramon San Ramon, California 94583 Attention: Brett Hunter Reference: Proposed Soil Excavation/Remediation Work Plan Former Chevron Service Station No. 9-6465 5608 North Pershing Avenue Stockton, California Gentlemen: INTRODUCTION This proposed work plan has been prepared by Touchstone Developments (TD) at the request of Chevron U. S .A. for the former Chevron station at the above referenced location (figure 1 ) . The purpose of this work plan is to describe • sampling activities associated with remedial excavation of hydrocarbon contaminated soil . Soil sampling activities performed during recent underground storage tank (UST) removal activities indicate that hydrocarbon contamination is present in the vicinity of the former waste oil tank and regular unleaded fuel tank area. See Touchstone Developments Underground Storage Tank and Line Removal Report dated March 31, 1993 . PROPOSED SCOPE OF WORK Soils will be excavated from the hydrocarbon-impacted areas located in the vicinity of the former Underground Storage Tank (UGST) areas ( identified by samples designated RW, WOS, WON and WX-1) that were removed on March 16, 1993 (figure 2 ) . Excavation will continue vertically and laterally until at least one of the following is encountered: * First occurrence of groundwater * Practical limits of the excavation equipment * Structural integrity of nearby buildings, utilities , or sidewalk would be 3eopardized * Chemical analysis indicates that only acceptable concen- trations of petroleum hydrocarbons remain * Property Boundaries * Contamination is not limited in extent • Soil samples will be collected from the bottom and sidewalls of the excavation for approximately every 15 feet by 15 feet F 0 Box 2554 • Santa Rosa CA 95405 • Office (707) 538-8818 • Fax (707) 538-8812 - Mobile/Fax (707) 484-5112