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4 <br /> r 0 0 <br /> California Regional Water Quality Control Board <br /> Central Valley Region , K <br /> Robert Schneider,Chair <br /> Alan C.Lloyd Ph.D. Arnold Schwaraenegger <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.waterboards.ca.gov/cm"lvalley <br /> Protection 11020 Sun Center Drive#200 Rancho Cordova,CA 95670-6114 <br /> Phone(916)464-3291 Fax(916)464-4797 M �) <br /> 8 February 2005 <br /> FEIN A g 7f?rF <br /> Mr. Daniel Decker DiM "dp�'iT "I"i.TH <br /> ContiGroup Companies, Inc. K(„v,i” U,rs <br /> 277 Park Avenue <br /> New York,NY 10172 <br /> REVIEW OF PROPOSED BASELINE LIMITS AND MONITORING REPORTS, <br /> CONTIGROUP COMPANIES, INC., 9504 HARLAN ROAD, FRENCH CAMP, <br /> SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board (Regional Board)reviewed the <br /> following monitoring reports submitted by Haley&Aldrich, Inc. for Huff&Huff, hie. (except as <br /> noted) on behalf of ContiGroup Companies, Inc. (ContiGroup) for the French Camp Grain Elevator <br /> facility at 9504 South Harlan Road in French Camp: <br /> • 29 April 2004 First Quarter 2004 Groundwater Monitoring Report (First QMR); <br /> • 29 July 2004 Second Quarter 2004 Groundwater Monitoring Report(Second QMR); <br /> • 28 October 2004 Third Quarter 2004 Groundwater Monitoring Report(Third QMR); <br /> • January 2005 Baseline Summary Report(Baseline Report) submitted by Huff&Huff, <br /> Inc.; and <br /> • 26 January 2005 2004 Annual Groundwater Monitoring Report(Annual Report). <br /> The First, Second, Third, and Annual Reports discuss groundwater sampling activities conducted <br /> in March, June, August, and November 2004, respectively. The Annual Report includes <br /> information regarding the proposed granular zero valent iron injection, including baseline <br /> sampling results and a health and safety plan. The Baseline Report summarizes sampling results <br /> and discusses the methods to determine baseline concentrations for monitoring wells MW-3B <br /> and MW-4B, as required by Waste Discharge Requirements No. R5-2004-0160 (Order). <br /> ContiGroup used two different methods to determine baseline concentrations. Both methods are <br /> from USEPA for single observation triggers and was provided in Appendix A of the Baseline <br /> Report. The difference in method depends on the number of sampling data points. Based on the <br /> number of samples for carbon tetrachloride and chloroform, Method 1 was used because there <br /> was sufficient data. Baseline levels for all other constituents of concern were calculated using <br /> Method 2. The explanation of the calculations for Methods 1 and 2 are provided in Section 2.0 <br /> of the Baseline Report. <br /> California Environmental Protection Agency <br /> p�d Recycled Paper <br />