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Mr. Moore 2 6 November 1995 <br /> ORC to be used here is magnesium peroxide. This version of an ORC device is marketed by <br /> REGENESIS Bioremediation Products, and consists of the ORC in a matrix material,placed in a <br /> sock or sleeve approximately 1 foot long. The nature of the matrix material, and the nature of any <br /> residuals left after the peroxide is released, have not been specified. The sock is placed inside the <br /> well casing, where it releases the ORC on a controlled basis. Replacement of the spent reactive <br /> material is required periodically,at a rate presumably determined both by the relative reactivity of <br /> the ORC and by site conditions. Monitoring will be necessary both to determine effectiveness and <br /> to detect the need for sock replacement. <br /> The report does not explain or propose what monitoring will be done. This was discussed via <br /> telephone with you. Staff concurs with your intention, stated in the conversation, to monitor for <br /> dissolved oxygen. At minimum, we recommend such monitoring take place on a monthly basis in <br /> all of the wells in which socks are placed. We understand that the level of DO will be taken as <br /> indicator of the successful release of the oxygenator and that,when the DO levels begin to drop, <br /> this will be taken as indicator of the need for sock replacement. . We recommend that additional <br /> monitoring be done, specifically, for TPH and BTEX after the first three to six weeks, whether or <br /> not that coincides with a regularly-scheduled sampling event. Field parameters (pH, temperature, <br /> and specific conductivity) should be observed carefully and reported for each sampling event . <br /> We request that you first obtain further information on the nature of the matrix materials and on the <br /> residual products from the oxygen release. Such materials and residuals shoud be unreactive in the <br /> ground water or should pose no threat to water quality. <br /> Based on the above, we concur with the proposal to install ORC passive bioremediation devices. <br /> Our approval is contingent upon first receiving further information on the matirx materials and <br /> reaction products, as described above. <br /> Please inform us before the installation is to be done. <br /> If you have any questions, please call me at (916) 255 3119. <br /> YA W GGETT, C.E.G. <br /> Associate Engineering Geologist <br /> GW:gw <br /> cc: Mr. Mike Infurna, SJCPHS <br /> Mr. Robert Sternfels, Reclamation District#548, Lodi <br /> Ms Yvonne Mabee, Tower Park, Lodi <br /> Mr. Harry Crockett, Real Estate Specialists, Sacramento <br /> Mr. Don McShane, Westrec Properties, North Hollywood <br />