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California R%ional Water Quality coontrol Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Alan C.Lloyd Ph.D. Arnold Scvernor negger <br /> Agency Secretary acramento Main Office Governor <br /> S AENVY , la //w -h,w cb.cagov/—mgob5 <br /> 1�' #200,Rancho Cordova,CA 95670.6114 <br /> H E A L T H O P , 643291•FAX(916)464-4780 <br /> 13 May 2005 2 c�1o7 <br /> John Scherer <br /> TCN Properties, L.P. <br /> 1481 Manila Road <br /> P.O. Box 317 <br /> Lathrop,CA 95330 <br /> WORKPLAN REVISION, YOSEMITEAVENUE PROPERTIES, LATHROP,SANJOAQUIN <br /> COUNTY <br /> I have reviewed the 20 April 2005 Relocation of Proposed Monitoring Well Location, prepared by <br /> ENGEO. The addendum was prepared to address a revised well location for Well MW-3. Inadequate <br /> information is provided in the request to allow staff to determine if the relocation is acceptable. <br /> The groundwater monitoring well installation workplan was described in Engeo Inc.'s 6 December 2004 <br /> Work Plan for Groundwater Study, and 11 February 2005 Response to Conditional Work Plan Approval <br /> for Groundwater Study. The Regional Board issued a 1 March 2005 Workplan Addendum letter <br /> approving installation of the wells. <br /> In a 12 May 2005 telephone conversation with Dennis Nakamoto, staff was informed the land <br /> application property boundary presented in previous workplan documents has changed. Please address <br /> the following items: <br /> • Provide an update to the map that shows the proposed land application areas and the groundwater <br /> monitoring wells. <br /> • Provide an explanation of the purpose of the depression location adjacent to the revised proposed <br /> location of Well MW-3. The depression appears to be at least ten feet deep and may be equipped <br /> with a pumping station to discharge stormwater and/or groundwater to some remote location. <br /> Please describe what effect the depression may have on groundwater characterization. <br /> Please submit the information before installing the groundwater monitoring wells. If you have any <br /> questions on this information, please telephone me at(916) 464-4616. <br /> TIMOTHY . O'BRIEN <br /> Waste Dis harge to Land Unit <br /> cc: Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Duncan Hickmott, Engeo Inc., Tracy <br /> California Environmental Protection Agency <br /> Z3Recycled Paper <br /> W:VSWAObnm'hSan loaquinVtichland IkJ�Sche�er 12 May 05.d. <br />