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WEST REGIONAL WASTEWATER TREATMENT PLANT - PERCOLATION PONDS MAINTENANCE The Board reviewed memo from Utilities Director Pinto: DATE: JANUARY 26, 1989 TO: JAMES E. CHANDLER COUNTY ADMINISTRATOR THRU: TERRANCE G. PINTO DIRECTOR OF UTILI 'VICES FROM: JOHN F. LANG ENVIRONMENTALSPECIALIST DEPARTMENT OF TILITY SERVICES SUBJECT: WEST REGIONAL WASTEWATER TREATMENT PLANT PERCOLATION PONDS MAINTENANCE BACKGROUND: The Department of Utility Services has a three -cell percolation pond at the West Regional Wastewater Treatment Plant, which is the existing permitted effluent disposal for this facility. In accordance with the DER permit for this plant, a reevaluation of the pond has to be completed once the plant has reached 250,000 gallons per day. The plant has reached a hydraulic flow capacity of 250,000 gallons per day as of the month of December, 1988. In order to maximize the disposal capacity of the pond for the reevaluation, each cell needs to be cleaned of the sedimentation and biomass that has accumulated on the bottom. This sedimentation and biomass is sealing the bottom of each cell. ANALYSIS: In order to clean the cells, the plant effluent must be diverted. The Department's sod farm, adjacent to the plant, is an appropriate site for effluent reuse. We propose to install a temporary gravity line from the plant's 16" discharge to the sod farm's eastern irrigation holding pond. We then propose to spray irrigate the sod farm with a 150,000 gpd (8 hours) spray irrigation system. This spray irrigation system could then be used to supplement the percolation pond capacity until additional permanent reuse areas can be permitted. Two additional items would need to be addressed prior to effluent reuse at the sod farm. These are capping of an artesian well adjacent to the holding pond and purchase of a complete portable irrigation unit suitable for sod application. The capping of the well should be accomplished for under $2,500.00, and conducted by purchase order. The gravity line connection to the 16" discharge line, installation of two valves, a valve pit and 90' of line could be installed by Utilities personnel. Surveying costs should run under $2,500.00, and would be accomplished by purchase order. A hauling contractor would also be utilized to bring in clean, coarse sand and spread same up to the surveyed markers. Irrigation proposals have been received from two local firms. A two-year-old IrriFrance traveling irrigation system composed of a diesel engine, pump, hose reel, and mounted spray gun is available from a franchise utility for $18,000.00, to include eight hours of instruction time. This unit was previously utilized for sod operations by Sun Ag, Inc. 45 J'E `989 45