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December 22, 1997 f` �} Page 3 of at an approved landfill With the permission of SJCEHD, clean stockpiled soil may be reused as fill Stockpiled soil, covered with plastic sheeting, will be temporarily stored on the southwestern portion of the site To reduce potential hazard associated with the presence of stockpiled soil onsite generated from excavation activities, Tosco requests SJCEHD written approval to transport the soil to Forward Landfill's holding area Once analytical results of the stockpile sampling are received, the landfill will utilize the soil at their facility appropriately GroundNvater Sampling Contingency Groundwater in the vicinity of the site has been reported at depths of approximately 20 to 25 feet bgs If sufficient water is in the tank cavity, one groundwater "grab" sample will be collected from beneath the gasoline USTs The "grab" sample will be collected after the tank pit has been evacuated one time and allowed to sufficiently recharge The groundwater sample will be submitted under chain-of-custody documentation to a California State-certified analytical laboratory for analysis as described below Dlschar ge Activities . Groundwater encountered during UST excavation may be pumped into a large holding tank to allow installation of new tanks If required, treatment of groundwater pumped from the UST pit will consist of a carbon adsorption unit onsite, prior to discharge to the City of Stockton sewer system, or transport to an appropriate treatment facility Treatment and discharge of pumped groundwater will be performed in accordance with a short-term groundwater discharge permit obtained from the City of Stockton Department of Public Works If separate-phase hydrocarbons (SPH) are encountered in the tank cavity, a vacuum truck may be utilized to remove the SPH prior to installation of the new USTs Laboratoiy Pi ocedures Soil samples (and groundwater grab samples, as appropriate) collected during UST and product Iine removal activities will be submitted to the laboratory and analyzed for the presence of total petroleum hydrocarbons calculated as gasoline (TPH-g), benzene, toluene, ethylbenzene, xylenes (BTEX compounds), and methyl tertiary butyl ether (MtBE) Additionally, samples from beneath the diesel tank and dispensers will be analyzed for TPH as diesel in addition, one selected soil sample collected from beneath _ the gasoline USTs or product lines will be analyzed for total lead and fuel oxygenates 911-009 1 A/XVOPIPLkN