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Mr. Carl Navarra <br /> 7500 W. Eleventh Street <br /> Page 3 of 3 <br /> believes at a minimum, the core wells in the plume should remain on a quarterly <br /> monitoring and sampling schedule. <br /> During the February 2005 groundwater-monitoring event, all wells should be sampled, <br /> including MWFP-1 through MWFP-5 and the potable water supply wells, and analyzed for <br /> 1,2-DCA, EDB, ethanol and methanol, except as noted above. EHD approves analysis of <br /> groundwater samples for the analytes and parameters recommended in Section 7.1 of the <br /> QMR. If additional analyses are needed to evaluate natural attenuation, please submit a <br /> brief work plan detailing the analytical regime to be implemented. As the site now appears <br /> to be assessed, it would be appropriate to prepare a corrective action plan (CAP) <br /> comparing monitored natural attenuation to other potential remedial options appropriate <br /> for the site, which can be submitted after collection and analysis of the natural attenuation <br /> data. <br /> Please submit a specific monitoring plan for the potable water supply wells that will ensure <br /> that potentially vulnerable wells will be protected. Demonstrate how wells removed from <br /> the current sampling regimen are unlikely to be impacted by the plume of dissolved <br /> contaminants. <br /> If you have any questions or comments you may contact Nuel Henderson at (209) 468- <br /> 3436. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Nuel C. Henderson, Jr., RG M.arga7FLAaaori, <br /> , REIS <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James L.L. Barton, CVRWQCB <br /> Mark Owens, State Cleanup Fund <br /> Dai Watkins, TSJCI <br /> I <br /> i <br /> i <br /> f <br />