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Ms.Margaret Lagorio, SJCEHD October 21,2003 Joe's Truck Plaza Project No. 2033-15600-01 Work Plan for Additional Site Assessment Page 11 Wastewater generated during drilling operations will be placed in properly labeled, DOT- approved 55-gallon steel drums, and stored at the site pending disposal. A licensed contractor will transport the wastewater, along with groundwater removed from the wells during development and sampling, to an appropriate facility for disposal. Task 3: Laboratory Analysis Soil and groundwater samples collected during the assessment activities will be forwarded to a California state-certified laboratory for chemical analysis under strict chain-of-custody procedures. Appendix A presents additional information regarding sample collection and analytical procedures. The soil and groundwater samples will be analyzed for TPHD and TPHG by USEPA Method SW8015B/DHS LUFT Manual, and for benzene, toluene, ethylbenzene, total xylenes (BTEX), MTBE, tertiary amyl methyl ether (TAME), ethyl tertiary butyl ether (ETBE), di-isopropyl ether(DIPE), tertiary butyl alcohol (TBA), 1,2-dichloroethane (1,2- DCA), 1,2-dibromoethane (EDB),methanol, and ethanol by USEPA Method SW8260B. Task 4: Data Evaluation and Report Preparation After completing the soil boring and well installation activities, and receipt of all analytical laboratory results, Stratus will prepare a report summarizing the findings. The report will summarize work conducted to date and present the findings of the additional assessment. The report will include, but not be limited to, groundwater flow and gradient maps, analytical tables, surveyor's report, certified analytical reports, boring logs, soil iso-concentration maps for TPHG, benzene, and MTBE, and revised cross sections (including chemical analytical data from previous investigations). Task 5: Feasibility Testing Aquifer Test Stratus proposes to conduct a GWE test using well EX-1 as the pumping well. The GWE test will involve performing: (1) a baseline water-level survey to determine the potential effects of ambient water-level fluctuations on the constant-discharge test and recovery period data, (2) a step-discharge pumping test to select an appropriate pumping rate for the constant-discharge test, and (3) a constant-discharge test and recovery to determine the hydraulic properties of the soil. The purpose of the step test is to assess well efficiency, specific capacity, and to select a suitable pumping rate for the constant-discharge test. The purpose of the constant- discharge test is to assess the transmissivity and storage capacity (specific yield) of the soils around the well, approximate a steady-state long-term pumping rate, and evaluate P:Voe's Truck Plaza\Work Plans\Joes workplan 102103.doc