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City of Escalon �b (8 Wastewater Treatment �9.U`�Plant 6 r�f�cg Sludge Management Plan The City of Escalon operates a municipal wastewater treatment facility with an average flow of approximately.7 MGD. The treatment process consists of a series of ponds for treatment by aeration and a series of ponds used for percolation. The municipal system serves the City with a current population of 5,700 people. The municipal system generates approximately 160 cubic yards of sewage sludge per year. Ponds 5,6 and 9 have sludge accumulation requiring future sludge removal. When the sludge accumulates to an unacceptable level in the entry treatment ponds it will be managed as follows: Sludge removal will be accomplished by diverting municipal wastewater to an alternate pond and allowing the pond to dry. There is sufficient pond space down stream to accommodate a pond out of service. The dewatering operation will begin in the early spring where the warmer months with longer sun exposure will aid the drying time of the sludge. The ponds will be drained and sludge dried in place. Plant personnel will monitor daily operations for nuisance odors. Odors will be corrected by applying lime to the surface of the exposed sludge and monitored. Plant personnel will skim through the dried sludge and retrieve any undesired screenings. The sludge will be dried in the bottom of the pond. If necessary the sludge will be wind rowed to aid the drying process. The sewage sludge will be tested per requirements of 40 CFR.503. Once dried the sludge will be will either be mixed with green waste and composted on site,or trucked to a state approved disposal site. Composted sludge will be tested and monitored per state and local requirements. Compost will be used as a soil amendment within the City or made available to nurseries also for a soil amendment. The yearly sludge volume generated by the City's municipal system is not significant so it is expected that the sludge will be removed from the site within two years of dewatering. Sludge removal will begin in pond 5 with flow diverted to pond 6. When pond 5 is completed flow will be diverted back to pond 5 and ponds 6 and 9 will be scheduled for sludge removal by the same process. The industrial wastewater pond system receives uncontaminated waste from a local industry that processes tomatoes and another industry that processes bell peppers. This wastewater is treated in a separate series of ponds and percolation basins. At the end of the processing season in November there is a significant accumulation of solids in the four treatment ponds. These solids are removed from the ponds in the late spring prior to the processing season beginning in June. Because of the increased flows encountered this past season the volume of solids is significantly higher than in the past years. This material will be remove from the four treatment ponds and stockpiled just east of ponds 1 and 4. Since this material is not classified as sewage sludge it will be removed from the site and land applied. Because of the high nutrient value of these solids it is expected that it will be desirable for land application.