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<br />SCREENINGS DISPOSAL <br /> <br />Buildin~ Addition Option <br />Screenings ITom each mechanical screen could <br />be collected and conveyed toward the west <br />wall. An enclosed, shaftless screw conveyer <br />would exit through a small access in the west <br />wall, north of the screening room door, shown <br />on the right. The screening room door would <br />be moved to the southwest side of the building <br />for easy access to the west side of the <br />mechanical screens. A building addition is <br />proposed to house a dumpster for screenings <br />west of the existing Pretreatment Building <br />(Figure 2). The addition would be 18'-0" long by 8'-0" wide, and the elevation would be <br />set to match the floor elevation of the grit building. A door would be installed for <br />personnel to access the south side of the addition. An overhead door would be installed <br />on the north side of the addition to allow a waste hauler to empty the screenings <br />dumpster. Ventilation would be provided to maintain a safe environment when occupied. <br />The cost for weekly collection is estimated to be $150 per month. For future design flow <br />conditions, the cost of collection is expected to increase due to an increase in screenings. <br /> <br />.t' <br />;!Ii~~'F.,~ <br />,:'!i.l-'--- F ~ <br />;"','" <i"'!,_ <br />t!]:.i l~;_ i <br />\;11:1 \"i."\." <br />t, :1". ' <br />. : ~ - <br />~ i <br /> <br />-- <br /> <br />Conveyance to Grit Room <br />A conveyance system can be installed to collect screenings ITom both mechanical bar <br />screens and transport the screenings to a dumpster located in the grit room It is feasible <br />to convey screenings through the north wall into the grit room of the Pretreatment <br />Building, and dispose of screenings with grit. A series of three conveyors are needed to <br />convey the screenings. First, the screenings need to be collected ITom the bar screens on <br />a conveyor that runs ITom south to north inside of the building. Then, screenings would <br />be discharged into a conveyor that tr<U1SpOrts the screenings west along the north wall of <br />the screenings room Finally, screenings would drop into a third conveyor that runs <br />through the north wall into the grit room. A small access would be cut through the north <br />wall, and a conveyor would pass through the access. The grit room is currently not rated <br />as explosion proof, and the electrical equipment that is ITeely exposed to air ITom the <br />screenings room would need to be explosion proof For this alternative, a wall could be <br />built between the east and west halves of the grit room to isolate the east half of the grit <br />room. Double doors for access would be installed on the east side of the east half of the <br />grit room. The east half of the grit room would not need to be explosion proof The <br />MCC, electrical panel, and sampler would then be moved to the east half of the grit room <br />Electrical equipment remaining in the west half of the grit room would be replaced with <br />explosion proof equipment. Lighting, wiring, junction boxes, and the grit classifier motor <br />would need to be explosion proof <br /> <br />Compactor Option <br />The screenings collected ITom both screens could be compacted in the conveyance <br />system for either of the above alternatives. Once compacted, screenings would be 40 <br /> <br />10 <br />