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Jr :, Page 2,8200 N. Hwy 99 <br /> U <br /> r <br /> formation of the shallow subsurface does not yield groundwater readily; flow <br /> rates remain very low when the system is operational. There have been many <br /> problems with the operation of the system since installation, including scaling <br /> issues, channeling of the flow through the carbon canisters and frequent <br /> breakthrough of contamination to the effluent stream. Ground Zero has <br /> recommended installing a third carbon canister to make changing out of the <br /> used carbon more economical. <br /> 4. The feasibility of additional remediation methods, such as insitu groundwater <br /> remediation, to enhance the overall remediation process should be evaluated. <br /> It was discussed that insitu methods, which inject selected substances to the <br /> subsurface to react with and breakdown the contamination, require bench . <br /> scale tests to ensure no hazardous by-products would result. <br /> Please prepare a work plan for continuation of the investigation of the vertical extent of the <br /> groundwater contamination at this site. The work plan is due for submittal to SJC/EHD no <br /> later than April 6, 2007. The work plan may include confirmation soil borings. Please <br /> proceed with preparation of the groundwater extraction system evaluation and a feasibility <br /> study for enhancing the remediation of the groundwater. The study is due for submittal to <br /> SJC/EHD no later than April 6, 2007. <br /> If you have any questions or comments please call Lori Duncan at (209) 468-0337. , <br /> Donna Heran, RENS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Margaret Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Program Coordinator, Unit IV <br /> i <br /> cc: James Barton, PG, CVRWQCB <br /> John Lane, PG, Ground Zero Analysis <br /> Lee Roy Pierce, JD, 1818 Grand Canal Blvd., Stockton 95207 <br />