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KLEINFELDER <br /> EXPECT MORE' <br /> APPENDIX C <br /> SUMMARY OF WWTP OPERATIONS <br /> The site includes four existing wastewater treatment ponds (WWTPs), which are located <br /> along the banks of Walthall Slough and the San Joaquin River. The four ponds, from <br /> south to north are designated as the Sequencing Batch Reactor (SBR) Pond, the Sludge <br /> Pond, the Equalization Pond and the Emergency Storage pond (See Plate 1). Proposed <br /> equalization pond (Pond No. 3) is also discussed below since it is being used as part of <br /> the WWTP processes. <br /> The wastewater treatment system has been designed to meet the projected effluent <br /> requirements of the RWQCB, and the redundancy and reliability standards of Title 22. <br /> The proposed treatment processes include screening, sequencing batch reactor, flow <br /> equalization, sand filtration, disinfection, effluent pumping, and sludge digestion/storage. <br /> The wastewater influent will be screened and discharged to the 200,000 gallon SBR <br /> Pond. The wastewater will be aerated and mixed in this basin and then the decant will <br /> be conveyed to a 49,000 gallon equalization Pond No. 3 located just east of the <br /> WWTP. On average the SBR Pond will go into settle mode and decant effluent about 4 <br /> times per day. Spare equipment (aerator, mixer and decanter) will be maintained on <br /> site for the SBR. Dual filter feed pumps will pump the tertiary effluent from equalization <br /> Pond No. 3 through the pressure sand filters. Dual polymer feed pumps and chemical <br /> storage tank will be provided at the filter station. The polymer feed pump will discharge <br /> into the filter inlet pipe just ahead of an in-line mixer. The pressure sand filters will <br /> consist of two 7-foot diameter units each with a hydraulic loading rate of 3.6 gallons per <br /> minute (gpm) per square foot of surface area at design filter flow of 140 gpm. Sodium <br /> hypochlorite will be mixed with the filter effluent and a modal contact time in excess of <br /> 90 minutes will be provided in the chlorine contact basin. <br /> 48093.E01/ST07R052/CJC/Iv Page C-1 <br /> ©2007 Kleinfelder, Inc January 26,2007 <br />