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February 24, 1999 <br /> Page 3 <br /> Groundwater Sampling Contingency <br /> If sufficient water is in the tank-excavation, one groundwater"grab" sample will be' . <br /> collected from beneath"the gasoline,USTs.: The "grab" sample will be collected after ~ <br /> 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 � I <br /> ' If encountered during 1UST excavation;groundwater may be pumped into,a large <br /> holding tank. If required,.treatment of groundwater pumped from the UST pit will F. i <br /> r consist of running it through a carbon adsorption unit onsite prior to discharge to the" <br /> Stockton sewer system. Alternatively, groundwater may be transported to'an ; . <br /> appropriate treatment and disposal facility. Treatment and discharge of pumped <br /> moundwater will be erforined in accordance-with ashort-tengroundwater discharge <br /> permit obtained from the City'of Stockton Department-of Public Works. If separate ZI <br /> phase hydrocarbons (SPH) are encountered in the tank-excavation; a vacuum truck may.; <br /> be utilized'to remove the SPH prior to installation of the new USTs. <br /> Laboratory Procedures . ` <br /> Soil samples (and the groundwater grab sample, as appropriate) collected during <br /> gasoline UST and product line removal activities will be submitted to the laboratory grid <br /> analyzed for the presence of total petroleum hydrocarbons calculated as.gasoline <br /> (TPH-g),benzene;,toluene, ethylbenzene, xylenes (BTEX compounds), and-methyl.., <br /> 'tertiary butyl ether(MtBE). In addition,,selected soil samples collected from beneath <br /> the gasoline,USTs and product lines•will be analyzed for total lead.aind fuel oxygenates. <br /> `Reporting and Schedule, <br /> After completion of the fieldwork-and laboratory analyses, the data will be evaluated <br /> and assembled into'a report. Included in the report will be soil(and groundwater) <br /> analytical results, chain-of-custody documentation, a summary of field activities and .. <br /> observations, manifests and destination of soil; and conclusions. This-report will be x: <br /> submitted to the S TCEHD within 6 to 8 weeks of receiving analytical results from the <br /> laboratory. . <br /> 911-011.1 A/WPLA]•I '. <br />