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2651 Airport Way <br />Page 2 of 2 <br />A generalized discussion about Oxygen Releasing Compound (ORC) as opposed to AS/SVES technology <br />feasibility was presented in the Focused Technology Evaluation section of the RA WP. Specific data was <br />not provided to substantiate assertions made in this section regarding the inferior feasibility of ORC to the <br />AS/SVESNT remediation method. Comparison of at least two different remediation alternatives, with <br />specific calculations data and costs for each method, should be provided to PHS/EHD. <br />Prior to a pilot test, "as built" plans for the AS/SVES should be submitted to PHS/EHD with the Work <br />Plan. Refer to the EPA510-13-94-003 document dated October 1994 entitled, "How to Evaluate Alternative <br />Cleanup Technologies for Underground Storage Tank Sites" for other information that should be included <br />in the remediation Work Plan. Start Up and Long Term Monitoring and Evaluation Plans should be <br />outlined according to the above referenced EPA document. <br />Continue quarterly groundwater monitoring for all contaminants of concern at this site. <br />Contact Carol Oz, Senior REHS at (209)468-3440 if you have questions regarding this letter. Notify this <br />office 48 hours in advance of the next sampling event. <br />Donna Heran, REHS, Director <br />Carol Oz, Senior REHS <br />Site Mitigation Unit IV <br />cc: Marty Hartzell-CVRWQCB <br />Mark Milward-Philip Services Corp. <br />Marga�Loio,HS <br />Supervisor <br />