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7. RECOMMENDED PLAN Farm pump station (under construction), and the purchase of four hose reel application systems. Future needs to continue developing the site to receive liquid biosolids include the following facilities: · Site preparation of an additional 260 acres for further liquids biosolids application · Addition of four hose reels Table 7.3.1-1 summarizes the existing and proposed 2025 unit processes, equipment, and design criteria. 7.3.5 Seasonal Industrial Waste Facility The SIWF provides long-term program flexibility for MWMC's biosolids and effluent reuse program and selling the land is not recommended. The recommended beneficial use of the facility includes land application of approximately 1.25 mgd of Level II reuse effluent. A reclaimed water pipeline is already in place from the existing WPCF to the SIWF, and with fairly minimal additional investment it could receive effluent. Retrofitting the sprinklers on the center pivots would be required. It would also be financially beneficial to investigate adding the S1WF to the WPCFs NPDES permit to decrease annual permit costs At some time in the future, MWMC may want to consider implementing modifications at the facility that would allow the site to receive liquid biosolids for land application. Table 7.3.2-1 summarizes the existing and proposed 2025 unit processes, equipment, and design criteria. 7.4 Recommended System Improvements 7.4.1 Peak Flow Management Improvements Recommended liquids and solids treatment process improvements combine to form an overall facility base solution used to treat normal dry and wet season flows and loads. PWWFs require additional facilities to handle low frequency, short duration, but high peak flow events. The recommended strategy for treating PWWF events in excess of the facilities' base treatment capacity is to implement a dynamic flow management strategy that optimizes the primary and secondary treatment capacities. This flow management strategy is shown in Figure 7.4.1-1. Additional new facilities required to implement the recommended peak flow management strategy include the following: · Pretreatment diversion pump station and pipeline from pretreatment to aeration basins · Primary treatment diversion pump station and pipeline from primary effluent box to new high-rate disinfection structure · Effluent blending and outfall structure · Additional bank outfall Operational practices during peak flow events require that PWWFs in excess of the primary clarifier capacity (estimated between 134 -160 mgd) be diverted from preliminary treatment directly to the aeration basins for secondary treatment. PE flows in excess of the secondary treatment capacity (estimated at 165 mgd) are to be diverted around secondary treatment for separate disinfection and subsequent blending with disinfected SE. Table 7.2.1-1 MWMC_7.0_REV4.DOC 7-9