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Mr. Dan McGrade <br /> December 21, 2007 <br /> Page 2 <br /> 3. A review of Figure 8 indicated that deep zone monitoring well MW-460 was <br /> not sampled. This well could be important to assess the vertical migration of <br /> chromium from the intermediate zone to the deep zone. Recommend collecting <br /> regularly scheduled groundwater samples from MW-460. <br /> 4. Well locations proposed for background and compliance well monitoring are <br /> for the shallow zone. Recommend including background and compliance well <br /> monitoring in the 100-foot sand and intermediate zones. <br /> 5. Copy DTSC on all documents transmitted to the Central Valley Regional <br /> Water Quality Control Board associated with compliance to Waste Discharge <br /> Requirements Order Number R5-2007-0126. <br /> If you have any questions, please contact Mr. Steven Ross, Project Manager at(916) 255-3694. <br /> Sincerely, <br /> Steve Ross <br /> Hazardous Substances Engineer <br /> cc: Mr. Peter T. Quinlan, Principal <br /> Dudek &Associates <br /> 605 Third Street <br /> Encinitas, California 92024 <br /> Mr. Tony P. Mikacich, C.E.M. <br /> Senior Geologist <br /> 3321 Power Inn Road, Suite 300 <br /> Sacramento, California 95826 <br /> Mr. Jim V. Rouse <br /> Principal Geohydrologist <br /> 3321 Power Inn Road, Suite 300 <br /> Sacramento, California 95826 <br /> Mr. Brett Stephens <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California 95670-6114 <br />