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The clarified water is collected through a submerged orifice/trough <br /> arrangement. The trough dumps into the Lamella Settler effluent box and <br /> discharges by gravity, to the existing Flow Equalization Basin. <br /> Chemical dosing rate for the caustic will be controlled automatically <br /> based on pH in the flash mix chamber by adjusting the pump stroke <br /> length. <br /> Coagulant and polymer dosing will also be controlled automatically by <br /> adjusting pump stroke length. Pump stroke length is manually adjustable <br /> at the main control panel using the electronic ratio control station to <br /> provide additional flexibility. <br /> 2.2 DESIGN CRITERIA <br /> The treatment system was designed on the basis of the untreated water <br /> with parameters as stated below: <br /> Untreated Parameter (num except as noted) <br /> Flow Rate (gpm) 260 continuous <br /> 300 max. flow <br /> 100 min. flow <br /> Untreated Turbidity (NTU) 10-65 <br /> Total Suspended Solids (TSS) 1000 max. <br /> pH (S.U. ) 4-12 <br /> Temperature 60°-85° F <br /> The projected average guaranteed treated water quality is as follows: <br /> Treated Parameters (ppm except as noted) <br /> Turbidity Less than or <br /> equal to 2 <br /> This turbidity reduction has been shown in previous testing to be <br /> adequate for required arsenic removal. <br /> 11654 2-3 <br /> VLS120588 <br />