Item A-MWMC Facilities Plan - Laserfiche WebLink

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6. DEVELOPMENT AND EVALUATION OF ALTERNATIVES Disadvantages: · Only provides for 1.5 mgd of reuse The reuse irrigation system would consist of two new effluent reuse pumps (one for redundancy) located at the BF pump station, a 14-inch buried pipeline, and irrigation tubes on 20- to 30-foot grids with microsprays on a minimum spacing of 20- to 30-feet. The irrigation tubes would be connected to a sub-main manifolded off the 14-inch reuse main. Estimated Cost: $3,600,000 Alternative 4 - Level IV Reuse Phase Alternative 4 would provide approximately 1.5 mgd of additional Level IV effluent, for a total of 2.0 to 2.5 mgd of Level IV reuse. The implementation of this alternative would be based on the public acceptance of Alternative 1, as well as general operational results. Similar to Alternative 1, the Level IV effluent would be applied to areas in proximity to the WPCF. The application area would have to be expanded. Assuming the reuse were applied on grass, approximately 370 additional acres of land would be required during an application period of July and August. This is based on providing an additional daily reuse application rate of 1.5 mgd (2.0-2.5 mgd total). Advantages: · Less restrictions associated with application of Level IV reuse compared to Level II effluent · Level IV effluent can be applied on a greater variety of sites (e.g., golf courses) than Level II effluent · Provides a buffer for future effluent thermal load regulations · Potential to further strengthen public perception of reuse Disadvantages: · Level IV reuse is more costly to achieve than Level II · Must expand the conveyance and distribution system constructed in Alternative 1 · More public land required · Requires public awareness and education program This alternative would require the expansion of the UV disinfection system installed as part of Alternative 1, and expansion of the conveyance pipeline and distribution system. A permanent structure housing the reuse equipment at the WPCF would also be needed. The cost assumptions for this alternative are based on identifying land within 3 miles of the WPCF, and an additional 1.5 mgd of UV disinfection capacity. Estimated Cost: $4,100,000 Alternative 5 - Full Scale Level IV Reuse Alternative 5 represents full development of reuse during the design period. This alternative assumes that all, or part of Alternatives 1 through 4 have been implemented. The intent of this alternative is to implement full-scale reuse of Level IV effluent. This would be accomplished through the additional application of effluent on green spaces, golf courses, and agricultural lands. 2.5- (poplars) to 5.0- (grass) mgd of reuse would be developed under MWMC 6.0 REV11.DOC 6-29