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• • <br /> . , California Regional Water Quality Control Board <br /> �` <br /> L Central Valley Region ' <br /> Robert Schneider,Chair <br /> Alan C.Lloyd Ph.D. Arnold Schwamenegger <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Protection Internet Address: http://www.sweb.ca.gov/—mqcb5 <br /> 11020 Sun Center Drive,#200,Rancho Cordova,CA 95670-6114 ��D <br /> Phone(916)464-3291•FAX(916)4644780 D <br /> 13 January 2005 V,ItQ,FJ1��IElOVIILE <br /> ENVIRONMENT HEALTH <br /> Cary Keaten Glenn Gebhardt PERMITJSERVICES <br /> City of Lathrop Califra LLC <br /> 16775 Howland Road 73 W. Stewart Road <br /> Lathrop, CA 95330 Lathrop, CA 95330 <br /> CONDITIONAL APPROVAL, WORKPLAN,REITER PROPER TYAND POND C,LATHROP, SAN <br /> JOAQUIN COUNTY <br /> I have reviewed the City of Lathrop, Tentative Waste Discharge Requirements, Reiter Property and <br /> Pond C, workplan prepared by RMC Inc., dated 11 January 2005. The workplan was prepared to <br /> provide additional information to support comments to the Tentative Waste Discharge Requirements <br /> (WDRs), which were distributed on 14 January 2005. I have the following comments on the workplan: <br /> • Please sample the existing wells at the Reiter Property as part of the investigation. The results <br /> should be compared to the results from the hydropunch samples. <br /> • Collection of groundwater samples at multiple depths may provide useful information in evaluating <br /> the TDS concentration trends with depth. Please describe how the information will be used in <br /> determining"optimum sample depths"for the other hydropunch samples. The collection of <br /> multiple depth samples may result in disagreements over which data to use. Consistent with the <br /> Antidegradation Policy, staff will recommend protecting the better quality water. <br /> • You may wish to add a deep boring in the middle of the land application area and adjacent to the <br /> irrigation canal to better characterize groundwater quality with depth and distance from the <br /> irrigation canal. <br /> • Please provide a description of how groundwater mixing from different depth intervals in the deep <br /> boreholes will be prevented. <br /> • Please provide a table listing the analytes, sample containers, preservatives, and allowable sample <br /> hold times. <br /> • Please provide a description of how the borings will be grouted. Because the borings will be placed <br /> in an area where wastewater will be applied, all the borings shall be grouted with neat cement <br /> pumped through a tremie pipe from the bottom of the boring consistent with San Joaquin County <br /> Well Standards Section 13.17.8. <br /> The investigation and report shall be prepared under the supervision of a California licensed civil <br /> engineer or geologist. Please submit a technical report that summarizes the investigation,results, and <br /> conclusions as a stand-alone document. <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />