Laserfiche WebLink
December 22, 1997 <br /> Page 3 �J <br /> of at an approved landfill. With the permission of SJCEHD, clean stockpiled soil may be <br /> reused as fill. <br /> Stockpiled soil, covered with plastic sheeting, will be temporarily stored on the <br /> southwestern portion of the site. To reduce potential hazard associated with the <br /> presence of stockpiled soil onsite generated from excavation activities, Tosco requests <br /> SJCEHD written approval to transport the soil to Forward Landfill's holding area. Once <br /> analytical results of the stockpile sampling are received, the landfill will utilize the soil at <br /> their facility appropriately. <br /> Groundwater Sampling Contingency <br /> Groundwater in the vicinity of the site has been reported at depths of approximately 20 <br /> to 25 feet bgs. If sufficient water is in the tank cavity, one groundwater"grab" sample <br /> will be collected from beneath the gasoline USTs. The "grab" sample will be collected <br /> after the tank pit has been evacuated one time and allowed to sufficiently recharge. The <br /> groundwater sample will be submitted under chain-of-custody documentation to a <br /> California State-certified analytical laboratory for analysis as described below. <br /> Discharge Activities <br /> Groundwater encountered during UST excavation may be pumped into a large holding <br /> tank to allow installation of new tanks. If required, treatment of groundwater pumped <br /> from the UST pit will consist of a carbon adsorption unit onsite, prior to discharge to the <br /> City of Stockton sewer system, or transport to an appropriate treatment facility. <br /> Treatment and discharge of pumped groundwater will be performed in accordance with a <br /> short-term groundwater discharge permit obtained from the City of Stockton <br /> Department of Public Works. If separate-phase hydrocarbons (SPH) are encountered in <br /> the tank cavity, a vacuum truck may be utilized to remove the SPH prior to installation <br /> of the new USTs. <br /> Laboratory Procedures <br /> Soil samples (and groundwater grab samples, as appropriate) collected during UST and <br /> product line removal activities will be submitted to the laboratory and analyzed for the <br /> presence of total petroleum hydrocarbons calculated as gasoline (TPH-g), benzene, <br /> toluene, ethylbenzene, xylenes (BTEX compounds), and methyl tertiary butyl ether <br /> (MtBE). Additionally, samples from beneath the diesel tank and dispensers will be <br /> analyzed for TPH as diesel. In addition, one selected soil sample collected from beneath <br /> the gasoline USTs or product lines will be analyzed for total lead and fuel oxygenates. <br /> 911-008.1 AAVORKPLAN <br />