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INTERNATIONAL PARK OF COMMERCE SPECIFIC PLAN•PHASE 2 JUNE 24, 2022 The wastewater treatment site will also house e. Storm Drainage the recycled water facilities, which include a Detention basins are proposed to serve new pump station and above ground storage tank. development in this specific plan. Though The location of the wastewater treatment site there are several important goals and benefits is shown on Figure 6.15. With the well head associated with the incorporation of detention treatment anticipated and discussed above, the basins as a storm drainage facility component, solids from the wastewater system are minimal the primary driving factors that warrant detention and can be recycled and used as fertilizer for the basins are limitations in downstream outfalls landscaping within the development. and discharge capacities and the need to provide significant storm water quality enhancement. New d. Recycled water detention basins will provide a significant amount The treated wastewater generated by the Project of storage capacity and will provide significant will be treated to the necessary requirements attenuation of peak flows to meter downstream to be used for the landscape irrigation of the releases of stormwater to reduced rates that are site. The project is preparing an application considered to be reasonable, acceptable, and to the regional water board for the disposal of environmentally sound. All proposed detention wastewater generated by the project. Once the basins have been sized to accommodate the 100- permit is approved by the reginal board then year 24-hour storm under build-out conditions, the project will work with San Joaquin County considering outflow discharge rates. environmental health department to construct the The surface areas of the proposed detention recycled water distribution system which will be basins, including access roadways and used to irrigate all of the landscaping throughout appurtenant features, range from 1 acre to 2.5 the project area. The recycled water system will acres. have a storage tank to help equalize the flows between the generation rate of the wastewater Detention basin depths have been typically treatment system and the irrigation demands. assumed to be eight feet as a general template The recycled water system will be fed by the for most proposed detention basins, including wastewater effluent storage tank. The recycled one foot of freeboard above the 100-year water water distribution system will be expanded as the surface elevation. An additional 20% has been project's landscaped areas are added. added to the surface area of assumed excavation for the detention basins to account for setbacks An on-site "purple pipe" system will be designed and provision for vehicular access around them and installed to provide the irrigation for the and to the lower areas to facilitate maintenance. project, see Figure 6.14. The treated wastewater A detention basin typical cross-section is shown will be stored in an above ground recycled below. Sizing will be based on Detention Basin water storage tanks and pumped to irrigate section 3-4.05 of the San Joaquin County the landscape. The recycled water tank and Improvement Standards published on November pump station will be located at the wastewater 2014, see Figure 6.16. treatment plant site. CHAPTER 6 6-18