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<br />percent solids and water buildup in the dumpster would be less of a problem The <br />volume of screenings is reduced 1T0m 50 to 70 percent, which would reduce wasted <br />dumpster volume. <br /> <br />Grinder Option <br />Grinding of screenings is another option that <br />could save considerable expense. The bar screen <br />would operate as previously described, but instead <br />of discharging onto a conveyor, it would <br />discharge into a grinder as shown in the photo to <br />the right. This is different 1T0m in-channel <br />communitor equipment. Screenings would be <br />ground to 5/8-inch solids and returned to the <br />wastewater flow stream. Ground screenings <br />would be captured in the grit tank and primary <br />clarifiers. A potential drawback of grinders is the increase of solids loading to the <br />digesters, which could affect land application. Grinder manufacturers include Muffin <br />Monster (Disposable Waste Systems, Inc.) and Franklin Miller. <br /> <br /> <br />GRIT DISPOSAL <br /> <br />A dumpster is needed to collect grit and screenings. Two options are available for dumpster <br />location. The frrst option is to locate the dumpster outside of the Pretreatment Building, and <br />construct an overhang to protect it 1T0m weather. Alternatively, a cheaper alternative would <br />be to locate the dumpster inside of the overhead door to collect grit directly 1T0m the <br />classifier. In this case, the waste hauler would be contracted to lift the dumpster out of the <br />building and empty it. Additional padding would need to be added to the overhead door and <br />building for protection ITom the waste hauling truck. Ace Solid Waste is the current <br />contracted waste collection service for the City. Ace can provide a 2-yard dumpster, with <br />wheels, that is roughly 7'-0" long by 3'-0" wide by 4' -0" deep to collect grit. The electrical <br />control panel located on the north side of the grit room needs to be moved prior to dumpster <br />placement. The cost for collection has been estimated to be $150 per month for a weekly <br />pick-up based on the current flow conditions. For the design average flow rate, more <br />lTequent collections would be required resulting in an increased cost of around $500 per <br />month. A reevaluation of the collection method may be investigated at that time. <br /> <br />MISCELLANEOUS <br /> <br />Retaining Wall <br />Site grading north of the Pretreatment Building and proposed grit system could be <br />facilitated by construction of a retaining wall. A retaining wall could be constructed <br />north of the building extending towards the existing primary clarifiers. The retaining <br />wall would allow leveling to grade, provide stability to the soil, and reduce erosion. <br /> <br />II <br />