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c $ vayw� <br /> I{ ANSI <br /> Addendum to Work Plan June 13, 1991 <br /> ARCO Station No. 760, Lodi, California AGS 3SO4$-6W <br /> At ARCO's request, Applied GeoSystems will conduct the following tasks during the <br /> tank replacement: <br /> o Update the site safety plan. <br /> o Provide liaison with the San Joaquin Co:inty Public Health Services, <br /> Environmental Health Division (SJCPHS). <br /> o Monitor ARCO's contractors remove the asphalt covering the tanks, the <br /> removal of the underground storage tanks, and the removal of the backfill <br /> materizl. Backfill material will be stockpiled onsite and covered with <br /> plastic. <br /> o Collect soil samples from the base of the tank cavity for laboratory <br /> analyses according to SJCPHS guidelines. <br /> o Monitor ARCO's subcontractors installation of geotextile fabric in the <br /> former tank cavity. <br /> -� o Collect four soil samples from approximately every 50-cubic yards of <br /> backfill. Each set of four samples will be compositad into one sample by <br /> the laboratory for analyses according ,o SJCPHS guidelines. <br /> o Monitor the excavation of the new tank cavity. Soil excavated from the <br /> new tank cavity will be placed in the oid tank cavity lined with geotextile <br /> fabric. We will monitor installation of neer tanks in the new tank cavity. <br /> Soil excavated from the new tank cavity and placed inti, the old tank cavity <br /> will be removed after installation of the new tanks, and disposed of. <br /> o Submit selected samples of the backfill removed'from the old tank cavity to.. <br /> a laboratory approved by ARCO for analysis of total petroleum <br /> hydrocarbons as gasoline and benzene, toluene, ethyiuenzene, and total <br /> xylene isomers. The composite sample from the stockpiled backfill <br /> t material having the highest concentration of TPHg will also be.. analyzed <br /> using a Bio-Assay according to test method listed in California <br /> Administrative Code Tit;c 22, Section 66696. In addition, samples from <br /> stockpiled backfill material will also be analyzed for extractable metals <br /> according to California Administrative Code Title 22. <br /> Apo/led Ge®SySteins _ <br />