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Mr. Harlin Knoll, SJCEHD April 7,2006 <br /> Work Plan for Confirmation Soil Borings Project No. 2007-0065-01 <br /> USA Station No. 65,Lodi, California <br /> Page 6 <br /> Task 213: CPT Borings and Groundwater Sampling <br /> Stratus will oversee a California licensed drilling contractor advance borings CPT 1 and <br /> CPT-2 to approximately 90 feet bgs (or equipment refusal). The CPT consists of <br /> advancing a cone-tipped cylindrical probe (1.7 inches in diameter) into the ground while <br /> simultaneously measuring the resulting resistance to penetration. A computer generated <br /> CPT log is plotted in the field, providing a continuous log of site lithology. Upon <br /> completion of sampling, the CPT holes will be pressure grouted from the bottom of the <br /> borehole up to surface grade. <br /> Following the CPT work, depth-discrete grab groundwater samples will be collected from a <br /> separate boring, located approximately 2 feet from the initial CPT boring. The number of <br /> grab groundwater samples collected from each of the direct push borings will be based on <br /> the strata encountered during CPT, and also on strata encountered in nearby borings <br /> previously drilled. HydropunchTM sampling equipment will be used to collect the <br /> groundwater samples at desired depth intervals, based on the continuous log generated <br /> from the CPT. The HydropuncWm sampler will be pushed to the bottom of the sampling <br /> interval using 2-inch diameter steel rods. The steel rods are subsequently retracted <br /> approximately four feet, exposing the screen to allow for the collection of depth discrete <br /> groundwater samples. The location and number of groundwater samples collected will be <br /> determined at the time of the investigation. Upon completion of sampling, the direct-push <br /> boring will be pressure grouted from the bottom of the borehole up to surface grade. <br /> Additional information regarding the CPT and groundwater sampling and handling <br /> procedures are described in Appendix A. <br /> Task 2C: Waste Management <br /> Drill cuttings and wastewater generated during the field activities will be contained in <br /> U.S. Department of Transportation-approved 55-gallon steel drums. The drums will be <br /> appropriately labeled and stored at the site pending proper disposal. A licensed <br /> contractor will transport the soil and wastewater to an appropriate facility for disposal. <br /> Task 3: Laboratory Analysis <br /> Soil and groundwater samples will be forwarded to a state-certified analytical laboratory <br /> for chemical analysis. The samples will be analyzed for TPHG using U.S. Environmental <br /> Protection Agency (USEPA) Method 8015B/DHS LUFT, and for benzene, toluene, <br /> ethylbenzene, xylenes (BTEX compounds), MTBE, tertiary butyl alcohol (TBA), tertiary <br /> amyl methyl ether (TAME), ethyl tertiary butyl ether (ETBE), di-isopropyl ether (DIPE), <br /> and 1,2-dichloroethane (1,2-DCA) using USEPA Method 8260B. <br /> KAUSA Gasoline100651Workplanslusa65-boring-cpt-workplan.doc 5MATU5 <br />