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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Ofrtce� lb PM12 48 Governor <br /> Environmental Internet Address: http://www.swrcb.c&gov/—mgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255.3015 <br /> 14 August 2001 <br /> Mr. Mike Bowles <br /> Pilkington North America <br /> 500 East Louise Avenue <br /> Lathrop, CA 95330 <br /> CONDITIONAL APPROVAL OF GROUNDWATER MONITORING WORKPLAN,PILKINGTON <br /> NORTH AMERICA,LATHROP,SAN JOAQUIN COUNTY <br /> I have reviewed the 16 July 2001 "Monitoring Well installation Workplan, " prepared by Condor Earth <br /> Technologies. The plan was prepared in response to Waste Discharge Requirement Order No. 5-01-114, <br /> Provision G.Le which required preparation and submittal of a groundwater monitoring workplan. After <br /> reviewing the workplan, I have the following comments: <br /> — The well locations are generally acceptable,however, if the gradient is not as northerly as anticipated, <br /> the wells may not adequately monitor the application areas. Additional wells may be required at a later <br /> time. If the groundwater flow direction was established from the on-site monitoring wells, it should be <br /> recognized that the cullet sump dewatering station is likely controlling the local groundwater flow <br /> direction. <br /> — Collection of soil samples during the drilling activities is required to describe lithology. Samples shall <br /> be collected at a minimum interval of approximately every five feet. <br /> — Three feet of bentonite pellets, when hydrated, may fill the annular space or leave an inadequate space <br /> to be filled With neat cement. Please limit the hydrated thickness of the bentonite transition seal to an <br /> approximate thickness of two feet. <br /> — San Joaquin County Well Standards Section 13.10.8 recommends that the sand pack be surged prior to <br /> installing the bentonite seal. This should be performed if conditions in the borehole allow it. <br /> The workplan is approved on the condition that the above comments are addressed in an addendum letter to <br /> be submitted prior to installation of the wells. WDRs Provision G.Lh requires the well installation report <br /> by 28 November 2001. If you have any questions on this conditional approval,please telephone me at <br /> (916) 255-3116. <br /> TIMOTHY R. O'BRIEN <br /> Waste Discharge to Land Unit <br /> San Joaquin River Watershed <br /> cc: Mike Huggins, San Joaquin County Environmental Health Department, Stockton <br /> Jeff Wilett, Condor Earth Technologies, Inc., Stockton <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.cagov/rwgcb5 <br />