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To: Mr. Mike Quartaroli Page 2 January 13, 1988 Peak hour flow rate is assumed to be equal to four times the maximum day flow rate. Annual quantities of wastewater are based on an average occupancy rate of 60%. B. WASTEWATER TREATMENT PLANT It is assumed that wastewater treatment will be accomplished with a package treatment plant. An extended aeration treatment process is frequently used for small domestic wastewater flows and is considered appropriate for the RV park. Two manufacturers of extended aeration package treatment plants are Purestream Inc. and Hydro-Aerobics International Inc. The package plant would include an aeration basin and a clarifier with return sludge capabilities. Based on sizing criteria given by Purestream Inc. , the overall dimensions of the aeration basin and clarifier would be about 12 ft wide, 28 ft long and 11 ft high. This unit would be suitable for buried or above grade service. A separate influent pumping station would be needed to lift the wastewater from the collection system pipelines into the package plant influent. Chlorination facilities can be attached to the package treatment plant. How- ever, regulatory agency requirements_: may call for a high degree of disinfec- tion, and it may be necessary to have a separate chlorination building and chlorine contact basin in order to achieve precise control of chlorine feed rates and sufficient contact time. Sludge stabilization and handling will be an important consideration. Aerobic digestion of the sludge is commonly used in conjunction with package plants and is considered appropriate in this case. The digester volume would be in the order of 200 cu ft. Blowers would be needed to provide oxygen to the digester. The same blowers could a-Iso be used to meet the aeration basin oxygen requirements. Disposal of sludge could be accomplished by removing the sludge from the diges- ters and transporting it to a municipal wastewater treatment plant for disposal one or two times each week (provided that the plant will accept the sludge) . One alternative would be to use sand drying beds prior to disposal in a land- fill . Another alternative would be land application of the sludge. Herein, it is presumed that drying beds will be the most feasible alternative. They would occupy about 250 sq ft of drying area. Sludge pumps would be needed to trans- fer the sludge from the digester to the drying beds. The quantity of sludge generated on the maximum day is estimated to be 150 gal at a solids concentra- tion of 3%. Mik NOLTE and ASSOCIATES Engineers/Planners/Survevors