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CES <br /> GENESIS ENGINEERING&REDEVELOPMENT <br /> Should nitrate concentrations be higher than acceptable by the City,or other obstacles for <br /> disposal of the purge water through the City's Non-Potable water distribution system arise,other <br /> avenues for disposal of the water will be explored, including use of the water for offsite <br /> agricultural purposes. The ultimate disposal option will be discussed with the RWQCB for their <br /> concurrence, prior to disposal of any of the aquifer generated purge water. <br /> 5.0 ISOTOPE ANALYSES <br /> The purpose of the proposed isotope ratio analyses is to assist with the assessment of the <br /> potential sources for the nitrate identified in the groundwater(fertilizer vs. animal waste) and <br /> with the assessment of communication between the shallow and deeper water bearing units. To <br /> better delineate potential sources of nitrogen in groundwater, the Work Plan will be amended to <br /> include additional isotope ratio analyses. The current Work Plan includes measuring tritium and <br /> nitrogen isotope ratios in five wells (three shallow aquifer samples two deep aquifer samples). <br /> The Work Plan is modified to include the oxygen isotope of nitrate to the suite of analytes. <br /> In addition,to better understand the lateral and vertical distribution of the isotope ratios, samples <br /> for isotope analyses will be collected from five well pairs. Samples for isotope analyses will be <br /> collected from the following well pairs: <br /> 1. RMW-ISR and RMW-1D, <br /> 2. RMW-3S and RMW-3D, <br /> 3. CRW-1 and CRW-1D, <br /> 4. CRW-2 and CRW-2D,and <br /> S. One of the proposed onsite deep wells and it's nearest shallow groundwater monitoring <br /> well. <br /> Access permission will be obtained from the City prior to sampling the City of Ripon wells. <br /> 6.0 SCHEDULE <br /> Based on the changes in work scope,the following is the modified Work Plan schedule. <br /> Task 1 Pre-field activities will commence upon approval of the Work Plan by the <br /> RWQCB,and notice to proceed by Defense Counsel. Driller, analytical <br /> laboratory, surveyor,waste hauler, and other subcontractors will be <br /> contracted and schedules coordinated for completion of the scope of work. <br /> Ripon Farm Services 4 of 5 <br /> Site Characterization Work Plan—Phase II <br /> November 2009 <br />