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Ranch Market page 2 <br /> 23569 S. Santa Fe Rd., Riverbank (Escalon). <br /> EHD cannot concur with your consultant's recommendation to replace the ozone <br /> injection system with ORC at this time since the current dissolved contaminant mass <br /> calculations and data showing that the ground water is oxygen deficient has not been <br /> provided. This information, in addition to a cost estimate and description (time and <br /> materials) of the complete ORC system/program needed to effectively reduce the <br /> contaminant mass, must be submitted to justify the use of ORC. <br /> Justifications and a cost estimate for DPE versus ozone generator replacement should <br /> be submitted so EHD can properly evaluate your DPE proposal. The proposal to <br /> perform DPE was not supported with technical justification for the length of the test (5- <br /> days) or the amount of water to be extracted (20,000 gallons). Residual/dissolved <br /> contaminant mass calculations should be prepared and included with the area of <br /> influence calculations and should show the necessity as well as the feasibility of this <br /> interim remedial action. <br /> Please submit the information to justify your proposals to EHD as soon as possible. <br /> You may contact Michael Infurna at (209) 468-3454 if you have any questions. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Michael J. Infurna Jr., Senior REHS Margare agorio RZS' <br /> LOP / Site Mitigation Unit IV Supervisor <br /> MI/ <br /> c: CVRWQCB — James L. Barton, Sacramento. <br /> c: GEOCON — Matthew Hanko, 2356 Research Dr, Livermore. 94550-3848. <br /> c: SWRCB-CUF — Mark Owens. Sacramento. <br />