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5606 Pacific Ave. page 3 <br /> You may alter your groundwater analyses requirements for all of your wells to semi- <br /> annually or annually except for MW-11 and MW-12. These two wells are to be quarterly <br /> analyzed for TPH-G, BTEX, and MTBE and reported in Quarterly Monitoring Reports <br /> (QMR) submitted to PHS-EHD prior to the next quarterly sampling event. Included in <br /> these QMRs should be groundwater depths for all wells, the groundwater gradient <br /> direction, and a calculation of the rate at which the groundwater flows. Conclusions <br /> and recommendations shall be included also. <br /> It is unfortunate that you have interpreted my comments on the use of Oxygen <br /> Releasing Compounds (ORC) as you have. It was never the intention of PHS-EHD to <br /> "see no effort initiated in this regard", but rather to bring to your attention that your <br /> proposed limited use of ORC would not be adequate or effective as proposed. This <br /> conclusion was reached after extensive dialogue with the ORC technical personnel who <br /> are very aware of the limits of their product. If ORC is still an option for you, PHS-EHD <br /> will evaluate it's use based on parameters established by the manufacturer and <br /> recommends that you consult with Regenesis Bioremediation Products Company prior <br /> to submitting any work plans that include ORC placement. <br /> Historical depth to water data for this site indicates that the deepest groundwater occurs <br /> during September. If this pattern continues and the Fourth Quarter-1996 groundwater <br /> measurements indicate that the depth to water still remains above the monitoring well <br /> screened intervals, PHS-EHD will require additional monitoring wells to be placed in the <br /> areas known to be or expected to be still contaminated and impacting the groundwater. <br /> Please continue to address your correspondence to Michael Infurna or contact me at <br /> (209) 468-3454. <br /> Donna Heran, REHS, Director <br /> Environmental Health /Division <br /> Michael Infurna Jr., Senior REHS Margare Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> MI/ <br /> c: CVRWQCB - G.L. Boggs <br /> c: SWRCB - Steve Marquez <br />