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California Regional Water Quality (ntrol Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/mgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 28 March 2002 <br /> O _ <br /> N <br /> �D <br /> Ramon Batista IV Stephen Dolim � - <br /> City of Lathrop Catlin Properties (representing Crossroads CREM I <br /> 16775 Howland Road 3620 Fair Oaks Boulevard, Suite 150 ?"_ <br /> Lathrop, CA 95330 Sacramento, CA 95864 <br /> ;T <br /> CONDITIONAL APPROVAL, GROUNDWATER MONITORING WORKPLAN, WASTEWA R <br /> TREA TMENT FA CILITY No. 1 (CR OSSR OADS), LA THR OP, SAN JOA Q UIN CO UNTY = <br /> I have reviewed the February 2002 Groundwater Quality Workplan for the City of Lathrop, prepared by <br /> Nolte Associates, Inc. The workplan was prepared in response to Provision FAA of the Waste <br /> Discharge Requirements (WDRs). After reviewing the workplan, I have the following comments: <br /> • The screen length proposed in the workplan may be excessive. Because the wells will be located in a <br /> land application area it is appropriate to maximize the amount of annular seal for each well. Please <br /> limit the screen length to 10 feet unless site conditions dictate otherwise. <br /> • If a slip cap is used on the bottom of the well casing, it must be secured using stainless steel screws. <br /> • The workplan states that only eight of the existing 13 wells are"fimctioning properly,"yet does not <br /> explain why the six wells are non-functional or whether they can be easily rehabilitated. Please <br /> describe the problems with these six wells and present a table listing all the wells that you propose to <br /> monitor for preparation of the Background Groundwater Quality Study Report required by WDRs <br /> Provision F.l.f. Depending on your list, additional groundwater monitoring wells maybe required in <br /> order to fully monitor upgradient and downgradient of all wastewater storage and land application <br /> areas. <br /> Please address the comments in this conditional approval prior to installing the wells. Please note that <br /> WDRs Provision F.Le requires the well installation report to be submitted by 30 June 2002. If you have <br /> any questions on this conditional approval, please telephone me at(916) 255-3116. <br /> TIMOT 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 /> Mike Anderson,Nolte Associates,Inc., Sacramento <br /> Georgia Reichelt, Land Utilization Alliance, Manteca <br /> California Environmental Protection Agency <br /> Co 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 dentand and cut vour enerev costs,see our Web-site at htto://wwwawrcb.ca.aov/rwacb5 <br />