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Plant and System Description As a means of directing sewage to the wastewater treatment facilities, the collection system originally began construction in 1955. The collection system has been designed and built to include homes, businesses, and industries within the City limits, and eventually expanded to collect wastes from outside the City limits as well. This is accomplished with sewer pipes ranging in size from 6 to 60 inches in diameter. Any wastewater entering from the County is metered as it enters City limits. Wastewater is normally conveyed by gravity to the treatment facility, with the exception of four pumping stations located within the system to lift the sewage from low lying areas. Over 300 homes on the City’s East End collection system also contain individual grinder pumps, maintained by the Wastewater Division, to aid in pumping due to the unusual geographical site conditions. Portions of the collection system are a combination of sanitary and wet weather flows. Sanitary is the portion of wastewater that contains the wastes discharged from homes, businesses, and industries. Wet weather flows are the increased flow rates normally seen during rain events that are a result of water flowing into the collection system through street catch basins, downspouts, and cracks or damage in the collection system piping. The City currently is undergoing a continuing program that identifies and separates known storm water catch basins to reduce the effects of wet weather flows. The Zanesville Wastewater Treatment Plant was originally built in 1959 as a Primary Treatment Plant that included primary treatment and sludge digestion. Since then, the plant has undergone several expansions, with the last construction project concluding in 2009. The plant is currently an Advanced Secondary Treatment facility rated for 11 Million Gallons per Day (MGD). Processes include screening, grit removal, primary clarification, trickling filtration, aeration biological treatment, disinfection (chlorination) with dechlorination (sodium bisulfite), primary and secondary anaerobic digestion, and belt filter press dewatering. The plant is operated under the limits provided by the National Pollutant Discharge Elimination System (NPDES) permit number 0PE0000 with the Ohio Environmental Protection Agency (OEPA). The final treated water is discharged into the Muskingum River. Waste (biosolids) that are removed from wastewater and dewatered for ultimate disposal. The plant transports the biosolids to a secondary facility for further digestion, placing the ultimate disposal requirements on the receiving facility.