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STATE OF CALIFORNIA PETE WILSON, Governor <br /> —i <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION -- <br /> 3443 ROUTIER ROAD, SUITE A <br /> SACRAMENTO,'CA 95827-3098 <br /> PHONE: (916) 361-5600 <br /> FAX: (916) 361-5686 RECEIVED <br /> 1992 <br /> ENVIRONMENTAL HEALTrli <br /> 6 January 1992 PERMIT/SERVICES <br /> Mr. Eric D. Horton <br /> Solid Waste Coordinator <br /> Forward Inc. <br /> P. O. Box 6336 <br /> Stockton, CA 95206 <br /> FORWARD LANDFILL, SAN JOAQUIN COUNTY(CASE NO. 2209) <br /> We have reviewed your letter dated 16 December 1991 regarding drying and disposal <br /> of wastewater treatment plant sludges. Although these sludges significantly exceed <br /> the minimum solids content for landfill disposal, you are proposing to land spread <br /> and treat the waste to further reduce the moisture content before to landfilling. You <br /> also state that the sludges are not hazardous or designated wastes. <br /> Forward's waste discharge requirements ( ) discuss wastewater treatment plant <br /> sludge disposal in several sections. In particular, Discharge Specification B.44. states: <br /> "44. Sludges from water or wastewater treatment plants may be disposed of <br /> by spreading on a one foot thick, compacted clay pad that is bermed to <br /> prevent runoff. Within 48 hours, this waste shall be disced into the <br /> clay pad in such a manner as to allow drying of the waste with no <br /> percolation of liquid through the bottom of the clay pad. Once the <br /> waste has dried, it and any soil it has contacted shall be moved to <br /> WMU [Waste Management Unit] D, or WMU H for disposal. The clay <br /> pad shall be rebuilt to its original thickness after each drying cycle. The <br /> application rate of sludge waste shall not exceed 270 cubic yards per <br /> acre. These sludges must not be a 'designated waste'. This operation <br /> may be done from May through October." <br /> You propose to conduct the drying operation within the land treatment area, WMU <br /> G, on a non-engineered clay pad. We understand that a "non-engineered" clay pad <br /> is one which is constructed with on-site soil using the same compactive effort and <br /> moisture conditioning as normal WMU soil liners, but without the rigorous <br /> construction quality assurance protocol used in Forward's landfill liner construction <br /> program. Given the temporary and replaceable nature of the drying pads and the <br /> language in Discharge Specification B.44, the proposed type of clay pad would be in <br /> compliance with Forward's WDRs. The clay pad must be bermed to prevent surface <br /> water runoff and operated to prevent moisture penetration through the pad. <br /> I <br />