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f: Llwrura.L enow,in <br /> i ���. UUYtwllUt <br /> A l l r o w w t n t,/,nir.A:v:HGDp1GJa: <br /> WaterBoardsfuvl:::rv6ia a awDiF n:a. <br /> Central Valley Regional Water Quality Control Board <br /> 11 October 2012 <br /> Michael Riddell <br /> City of Riverbank <br /> 6707 Third Street <br /> Riverbank, CA 95367 <br /> APPROVAL OF GROUNDWATER MONITORING WELL INSTALLATION WORKPLAN, CITY OF <br /> RIVERBANK WASTEWATER TREATMENT FACILITY, STANISLAUS COUNTY <br /> I have reviewed a 27 August 2012 Groundwater Monitoring Well Installation Workplan prepared by <br /> your consultant, Giuliani and Kull, Inc. The workplan describes the proposed installation of two <br /> additional groundwater monitoring wells. The wells will be used in conjunction with the eleven existing <br /> groundwater monitoring wells to expand the groundwater monitoring well network, and better <br /> characterize the background groundwater quality. <br /> The workplan is generally acceptable. Please be advised that Central Valley Water Board staff <br /> prefers that a well screen length shall not exceed 15 feet unless site conditions dictate otherwise. In <br /> addition, State and local monitoring well installation guidelines state that the sanitary seal must extend <br /> to at least 20 feet below ground surface (bgs). We prefer the deepest sanitary seal possible for the <br /> first encountered groundwater, even if the top of the well screen is below the water table. <br /> The City of Riverbank shall begin implementation as described in the workplan. Please submit the <br /> Groundwater Monitoring Well Installation Report by 1 February 2013. <br /> If you have any questions regarding this letter please contact me at (916)464-4648. <br /> GUY CHI'LDS, P.G. <br /> Engineering Geologist <br /> Waste Discharge to Land Compliance Unit <br /> cc: Bella Bedal, Stanislaus County Environmental Health Department, Modesto <br /> William Kull, Giuliani and Kull, Inc.; Oakdale <br /> gj c: 11 Oct-12 <br /> KAF,.. E- _0N0LC-•scD, P.E. CHntr I PAMELA C. CFECDON P.C., ©CE[.EYEcu7jn-orncEr <br /> _._....._....__.-.. .._ ...'95'6' . ..-......_...... .. ..... . . - . .. ._._.._ ........ _ <br /> i i02C1 Sur Cerner Onve M?UC RartcnG Cordova Ch 95676 tyww vra•arnoartls Ca gowcenraivm�ay <br />