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PC,, California Regional Water Quality Control Board <br /> Central Valley Region 4 ..... <br /> Robert Schneider;Chair Arnold Schwarzenegger <br /> Alan C.Lloyd Ph.D. Sacramento Main Office A1411: 39 Governor <br /> Agency Secretary <br /> Internet Address: http://www.waterboards.ca.gov/centralv�ll�y( <br /> 11020 Sun Center Drive,#200,Rancho Cordova,CA 9567TVlI h1" H E N T Q L T f <br /> Phone(916)464.3291 •FAX(916)464-0780 H E A L T H D E P A R T H E N T <br /> 20 March 2006 <br /> S.R. Moore, Warden <br /> Deuel Vocational Institution <br /> 23500 Kasson Road <br /> Tracy, CA 95376 <br /> REVISED REPORT OF WASTE DISCHARGE FOR THE DEUEL VOCATIONAL INSTITUTION <br /> REVERSE OSMOSIS WATER TREATMENT PLANT BRINE EVAPORA TION PONDS, SAN <br /> JOAQUIN COUNTY <br /> On 30 January 2006, Regional Board staff received the revised Report of Waste Discharge (RWD) and <br /> $9,000 filing fee submitted by your consultant, Mr. Thomas Kalkman of Carollo Engineers, on your <br /> behalf. In addition, staff received a revised slope stability analysis via email on 13 March 2006. Based <br /> on a staff's review,the revised RWD remains incomplete. <br /> Staff presents the following comments: <br /> 1. A double liner system is proposed with a secondary containment layer that will serve as the <br /> vadose zone monitoring system. The liner system consists of the following (from top to bottom): <br /> 18 inches of fill, 60 mil HDPE, LCRS (pipe or geocomposite drainage layer), 40 mil HDPE, <br /> LCRS, liner(minimum 40 mil HDPE). This design complies with the California Code of <br /> Regulations Title 27 (Title 27) minimum design standards for Class Il surface impoundments. <br /> 2. Each pond shall have separate primary and secondary sumps for leachate collection and <br /> monitoring. Also, each sump shall be designed to pump leachate back to the surface <br /> impoundment. <br /> 3. To mitigate high groundwater elevations, a groundwater interception trench was incorporated <br /> into the design. However, as outlined in an email from Mr. Kalkman, dated 9 March 2006, the <br /> pond design has been revised. In the revised design, the groundwater trench has been removed <br /> and the base elevation of each pond has been elevated by two feet. Based upon data provided in <br /> the RWD,the increase in elevation will provide the five-foot minimum separation between waste <br /> and groundwater. However, the design is based on groundwater elevations that were recorded <br /> during a one time geotechnical study performed in May 2005. Groundwater monitoring wells <br /> will be installed prior to the construction of the ponds and if groundwater elevations increase, <br /> then the pond elevation design shall be re-evaluated to certify that the five-foot separation <br /> requirement is achieved. <br /> California Environmental Protection Agency <br /> p�a Recycled Paper <br />