SITE INFORMATION AND CORRESPONDENCE CASE 2

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California ,gional Water Quality Con )l Board Central Valley Region Karl E. Longley,ScD,P.E.,Chair Linda Adams Sacramento Main Office Arnold 5ecretaryfor 11020 Sun Center Drive 4200,Rancho Cordova.California 95670-6114 Schwarzenegger Environmental Phone(916)464-3291 •FAX(916)464-4645 Governor Protection http://xvww waterboards.ca.gov/centralvalley 28 February 2007 D MAR 0 i 2007 Jim Silva Mike`8-ilt6n, Distript., n9inee r Beck Properties, Inc. Oakwood'Lak:e'-W, er, District 3114 West Hammer Lane 2541 East Canal Drive Stockton, CA 95209 Turlock, CA 95380 CONDITIONAL APPROVAL GROUNDWATER MONITORING WORKPLAN, OAKWOOD LAKE WATER DISTRICT AND BECK PROPERTIES, INC., WASTEWATER TREATMENT PLANT, SAN JOAQUIN COUNTY I have reviewed the 26 January 2007 Groundwater Monitoring Workplan, Oakwood Lake Water District, prepared by Kleinfelder Inc. The workplan was prepared in response to Waste Discharge Requirements Order No. R5-2006-0114 Provision G.1.b. to characterize groundwater quality prior to waste application at planned land application areas for a new residential development. In addition, the workplan was discussed at a 16 February 2007 meeting at the Regional Water Board's office. We discussed the proposed location of Basin No. 4 presented in the workplan; the proposed location is different than described in the Report of Waste Discharge. Waste Discharge Requirements Order No. R5-2006-0114 (WDRs) describe the wastewater treatment system, including land application areas and recycled water storage ponds in Findings No. 5, 23, 28, 29, and Water Recycling Specification No. 6. Discharge Prohibition No. 5 prohibits application of recycled water in a location other than described in the WDRs. Technically, relocation of Basin No. 4 to an area other than presented in the RWD would be a violation of the Order. However, Discharge Specification B.3 requires adoption of a resolution by the Regional Water Board before wastewater flow rates can increase above 55,000 gallons per day. Because Basin No. 4 is planned for Phase II of the wastewater system, you may request that relocation of the Basin No. 4 be considered as part of the resolution. Such an approach may result in the need for additional groundwater monitoring wells. Another topic of discussion at the meeting was the need to monitor all land application areas. It was noted that some of the land application areas are irregularly shaped. The Recycled Water Expansion Report (RWER), required by Provision GA.h, requires confirmation that the proposed land application area(s) overlie shallow groundwater with an average TDS concentration of 850 mg/L or more. The workplan must describe an investigation that will produce data on the groundwater quality in all proposed land application areas (or a characterization that is adequate to reasonably conclude groundwater conditions comply with the requirement). In some of the areas, grab groundwater sampling may be adequate to determine the groundwater quality for the purpose of preparation of the RWER. You may propose any sampling technique you prefer, but it must be adequate to characterize the groundwater quality. California Environmental Protection Agency Ca Recycled Paper