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<br />I <br />,I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The adopted capacity of 1.0 mgd for the water treatment plant is <br />well within the capacity range for package water treatment plants. <br />Package water treatment plants are proprietary equipment and are <br />predesigned, factory assembled, and skid-mounted units which in- <br />corporate, generally in single tanks. a treatment process consist- <br />ing of rapid mix, coagulation/flocculation. sedimentation (if <br />needed) and filtration. The package plant would be installed inside <br />a structure that would also house the treated water pumping station <br />and which would serve as an operations and control building. The <br />usual design criteria for such package plants are listed in Table <br />V-2. <br /> <br />The grit chamber would be custom designed in connection with the in- <br />take structure and the river pumping station. The assumed design <br />criteria for the proposed grit chamber is given in Table V-l, <br /> <br />TABLE V-l <br />GRIT CHAMBER DESIGN CRITERIA <br /> <br />Description <br /> <br />Units <br /> <br />Design Criteria <br /> <br />ft <br /> <br />Horizontal flow <br />5:1 <br />7.20D <br />0.15 <br />15 <br />10 <br /> <br />Type <br />Length/width ratio <br />Surface loading rate <br />Horizontal velocity <br />Detention time <br />Depth <br /> <br />gpd/ft2 <br />ft/sec <br /> <br />min <br /> <br />A capacity of one million gallons was adopted for the treated water <br />storage tank. The storage tank was sized to provide the storage <br />requirement of 750,000 gallons specified for the Southside Center <br />(assumed to include the Southside Center fire demand volume). <br /> <br />V-5 <br />