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Page 40 <br />Section E: RBSIDUALS MANAGBMHNT FACILITIES OPERATIONS <br />The DEQ has given its approval to apply wastes to <br />another site -185 acres adjacent to the present <br />facility. However, additional irrigation equipment <br />must be purchased and an agreement made with <br />the land owner. <br />^ SLUDGE MANAGEMENT PROGRAM <br />The Sludge Management Program operates the <br />treatmentandapplicationprogramforthe anaera <br />bically digested sludge produced by the regional <br />wastewater treatment plant. The program's goal is <br />to utilize the sludge through methods that make <br />use of its soil-conditioning qualities. This has been <br />accomplished over the last five years through a <br />successful agricultural land application program. <br />Future goals will focus on developing a dry sludge <br />program and marketing the sludge for residential <br />use, which should result in lower overall operating <br />costs. <br />The Sludge ManagementFacility (SMF) wenton- <br />line inMarch 1989 and was the final section of the <br />regional treatment facilities to be completed. It <br />was constructed in two phases. First, a temporary <br />sludge thickening and dewatering facility with a <br />limited sludge lagoon capacity was constructed. <br />This allowed the plant to maintain an indepen- <br />dentsludge program until Phase 2 was completed. <br />Phase 2 consisted of constructing the permanent, <br />off-site facility. <br />• Recontour of Lagoon Dike <br />Wave action has created shelves on the north side <br />of the lagoon dike. To protect the integrity of the <br />dike, the northeast and northwest banks must be <br />recontoured. <br />DESIGN CRITERIA AND CAPACITIES <br />• Sludge Drying Beds <br />Fourteen sludge drying beds of varying sizes com- <br />prise atotal of 24 acres for air drying harvested <br />sludge..All drying beds have an underdrain system <br />and an asphalt surface. Adecant/drainage pump <br />station containing two 250-gpm rated pumps is <br />usedtoremove dryingbeddecantandthentodrain <br />and discharge it back to the facultative sludge <br />lagoons. <br />The design criteria and capacities of the SMF, <br />including the transfer system and disposal site, <br />were planned and constructed by Brown and <br />Caldwell. The design specifications were based on <br />the amount of digested sludge the regional treat- <br />mentplant was expected to produce through the <br />year 2000. <br />PHYSICAL DESCRIPTION <br />The SMF is locatedapproximately 4.5 miles north- <br />west of the regional treatment plant on a 154-acre <br />site. Digested sludge is pumpedfive miles to the site <br />through an eight-inch force main. Facilities con- <br />sist of four facultative sludge lagoons, 14 sludge <br />drying beds, a supernatant pump station, a har- <br />vestedsludge storage tank, a pump station, a dried <br />sludge storage building, and an operations build- <br />ing. <br />• Facultative Sludge Lagoons <br />Each of the facultative sludge lagoons covers 6.25 <br />acres, providing a total of 25 acres of lagoon surface <br />area. Individual lagoons are 13.5 feet deep, have a <br />volume of 74 acre feet, and are linedwith a 36-mil <br />Hypalon lining material. Each lagoon also has two, <br />15-HP, horizontal brush-type surface mixers to <br />break up accumulations of scum and solids. The <br />design solids loading capacity for each lagoon is 25 <br />pounds VSS/1,000 square feet/day. With this load- <br />ing rate, a 40 percent reduction of volatile solids <br />can be achieved. <br />Sludge is dried in asphalt drying beds. <br />