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DESIGN CRITERIA Page 3 <br />• Sludge holding tank <br />Dimensions: 11'10"~. x 2'3"1 x 10'11"h <br />Volume 1,683 gallons <br />Equipped with air diffuser for aeration <br />and mixing, waste sludge diversion <br />__ valuing from sludge return line, super- <br />natant decant line to surge basin. <br />Chlorine contact chamber <br />Volume 1,306 gallons <br />Detention time 2.1 hours <br />Equipped with baffling to prevent short <br />circuiting, flow measurement weir with <br />stilline well and s`_aff gauce, 4 inch <br />flanged effluent connection. <br />Chlorination equipment by others. <br />• Controls - All electrical controls are <br />mounted in a i.ENIA 4 panel, requirinc <br />a 230 Vac, 1 ph, 60 Hz main cower <br />supply. <br />General construction - P.11 tanks are con- <br />structed of I/4 inch structural steel <br />ASTN: A-36, reinforced for installation <br />above or below ground on a suitable <br />foundation slab. All interior and ex- <br />terior surfaces are either wheel abraded <br />and primed or sandblasted, ±hen coated <br />with coal tar epoxy to a dry film thick- <br />ness of 10 mils. Cathodic protection <br />provided with four-17 lb magnesium anodes <br />attached at each corner. <br />Catwalks are constructed of 3.14 lb/ft2 <br />expanded metal galvanized grating located <br />with handrails as shown. Catwalk along <br />aeration and surge basins can be omitted <br />if desired for below around installation. <br />~ Clarifier floor surface is grout layer <br />placed after construction to match sludge <br />• collector. <br />v Total nameplate horsepower (with auxiliary <br />blower and comminutor) 14.83 hp <br />