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5 feet bgs, and 0.5 to 1 feet above the soil/water interface table (7.5 to 10 feet bgs) from <br /> the seven (7)borings listed above. A log of each boring will be prepared in the field. <br /> Upon reaching the desired total depth, 2-inch diameter polyvinyl chloride (PVC) <br /> monitoring wells will be installed in each boring in accordance with California Well <br /> Standards Bulletin 74-90 and San Joaquin County Environmental Health Department <br /> regulations. Each well will be completed utilizing either a traffic-rated flush-mount well <br /> vault with a concrete apron sloped to prevent the infiltration of water or, in areas <br /> susceptible to surface water accumulation, an above-ground well monument surrounded <br /> by bollard posts to protect the well from vehicular traffic. The type of surface completion <br /> utilized will be determined by the final well locations. <br /> Following installation and development, each new monitoring well will be surveyed by a <br /> California licensed land surveyor to obtain the horizontal position, as well as the top of <br /> casing elevation and top of monument lid elevation of the sixteen newly installed <br /> monitoring wells at the site. Survey elevation datum will match that utilized for current <br /> STTC monitoring wells. An electronic version of the survey will be prepared in <br /> accordance with State Water Resources Control Board GeoTrackerTM database survey <br /> XYZ guidelines and uploaded to the GeoTrackerTM database. <br /> Soil cuttings generated during well installation will be placed in DOT approved <br /> 55-gallon drums or an on-site roll-off bin pending disposal at an off-site facility. Water <br /> generated during well installation and development will either be stored in DOT approved <br /> 55-gallon drums or an on-site temporary holding tank pending disposal at an off-site <br /> facility. <br /> Details and procedures for field screening, soil sample collection, monitoring well <br /> installation/development, and the associated laboratory analyses are presented in the SAP <br /> provided as Appendix B. <br /> 4.4 Groundwater Sample Collection <br /> Following installation of the 16 new monitoring wells, a groundwater monitoring event <br /> will be conducted to assess groundwater quality in the new wells. During the monitoring <br /> event, groundwater samples will be collected utilizing "low-flow"sampling techniques in <br /> accordance with the United States Environmental Protection Agency(USEPA)Low-Flow <br /> Groundwater Monitoring Procedures (USEPA, 1996). ETG will attempt to coordinate <br /> the monitoring event with the scheduled second quarter 2012 STTC monitoring event. <br /> Purge water generated during groundwater sampling will either be stored in DOT <br /> approved IA2 55-gallon drums or an on-site temporary holding tank pending disposal at <br /> an off-site facility. <br /> Site Characterization Work Plan,Final, May 18,2012 <br /> 1007-012.002 4-3 <br />