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r <br /> disposed of at a hazardous waste landfill. Any stockpile which <br /> exhibits TPH concentrations less than loon mg/kg will be shipped <br /> * � to Forward Inc. in Stockton for land spreading. <br /> in addition, due to the depth of this excavation, the excavated <br /> side walls will be laid back or shored to conform with applicable <br /> OSHA Regulations. Upon completion of the initial excavation, the <br /> sidewalls at a depth of 25' below the surface will be sampled. <br /> Four sidewall samples will be collected and analyzed (within 24 <br /> hours; sooner if required) for the same parameters as the stock- <br /> pile composite samples. If the sample's TPH concentration <br /> exceeds the 10 mg/Kg, additional excavation in the direction of <br /> y the remaining "high01 chemical concentrations will be conducted in <br /> 10' increments. Sidewall sampling and excavation will continue <br /> until the sidewall TPH concentrations are below the cleanup level <br /> y or are non-detectable. The sidewall sample analytical results <br /> will determine the disposal alternative for the additionally <br /> excavated soils. Should the stepped excavation extend to the <br /> boreholes which exhibited non-detectable hydrocarbon <br /> concentrations, the maximum quantity of excavation would be <br /> approximately 3,500 cubic yards. <br /> � Prior to finalizing the excavation, four additional sidewalls <br /> I(r samples will be collected and analyzed for the following: <br /> -A <br /> o Total petroleum hydrocarbons, gasoline - method 5030 <br /> o Total petroleum hydrocarbons, diesel - method 5030 <br /> o chlorinated hydrocarbons - method 8010 <br /> rj o Organo Lead - soluble fraction - DOHS method <br /> o Ethylene dibromide - DOHS method (per AB1803) <br /> Based on the above summary of activities, the excavation project <br /> twill be performed in the following manner: <br /> .4 A. Access <br /> k Arrangements will be made with San Joaquin County for access <br /> to the site for excavation personnel and equipment. Perime- <br /> ter fencing will ensure that unauthorized access to the site <br /> }}, is denied. In addition, the sidewalks along both the <br /> Washington street and Sutter Street sides will be closed <br /> diverting foot traffic across the streets. <br /> I ` B. Excavation Technique <br /> For the initial stage of the excavation, the ekcavated soils <br /> r will be removed by a track hoe and stockpiled on-site on <br /> plastic tarps. These . stockpiles will be covered with <br /> ivK <br /> plastic tarps prior to loading. If additional excavation is <br /> needed, the soils will be loaded directly onto awaiting <br /> i <br /> trucks. . <br /> i " <br /> 6 - <br />