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0 <br /> 2 <br /> PUREGRO/BREA, STOCKTON <br /> 2. A plan to determine whether the 1,2-DCP and nitrate plume is confined to the shallow <br /> (approximately 70') aquifer, or whether it has moved into the next deeper aquifer. <br /> 3. A plan to remove or immobilize as much of the source material as possible. I understand <br /> that recent soil samples have shown that the soils of the former north pond contain <br /> measurable concentrations of 1,2-DCP, and that you now believe this pond to be the main <br /> source of the groundwater contamination. <br /> 4. The elements of a feasibility study to determine how to remediate the groundwater. Carbon <br /> filtration, air stripping, and UV/oxidation have all been used with success on volatiles. You <br /> may be aware of other treatment technologies. At a minimum, the feasibility study should <br /> include the collection of aquifer and soil data necessary to design extraction well(s); a <br /> determination of the remediation method which will be used; and a preliminary design of the <br /> extraction and treatment system. <br /> Please submit the workplan, and a proposed time schedule for implementation of each of the items, <br /> by 14 April 1995. <br /> If you have any questions, or wish to set up a meeting to discuss this matter, I can be reached at <br /> (916) 255-3104. <br /> WENDY WYELS <br /> Ag Regulatory Unit <br /> cc: Mr. Mike Infurna, San Joaquin County Public Health Services, Stockton <br /> Mr. John Rapp, Sierra Pacific Groundwater Consultants, El Dorado Hills <br />