Final Report, 2010 Urban Water Management Plan - Culver City

disinfected, secondary effluent (roughly 91 percent of Hyperion’s flow) is discharged to thePacific Ocean through a 5-mile submerged outfall pipe in Santa Monica Bay.WBMWD operates the ECLWRF, located in El Segundo, California, and is contractually entitledto receive up to 70 mgd of secondary effluent from the Hyperion WWTP for advanced treatment,but on average receives about 34 mgd. ECLWRF provides tertiary treatment to the Hyperionsecondary effluent to produce high-purity recycled water that complies with the requirements ofTitle 22 of the California Code of Regulations. The recycled water produced by ECLWRF isused for beneficial uses such as landscape irrigation, industrial applications (including coolingwater and boiler feed water), and other purposes such as groundwater injections to controlseawater intrusion.Because the Hyperion WWTP treats wastewater for a larger population than exists in the CulverCity System, an estimated per capita wastewater generation factor was used to calculate thevolume of wastewater generated by the customers in the Culver City System. The wastewatergeneration factor is based on the total population served and the average wastewater treatmentrate for the Hyperion WWTP. The WWTP serves approximately 4 million residents and treats anaverage of 300 mgd, making the average per capita wastewater generation factor for theHyperion WWTP 75 gallons per day (gpd).This factor was used to estimate the existing andprojected volumes of wastewater collected and treated in the Culver City System as shown inTable 4-10. Since about 9 percent of Hyperion’s effluent will be treated by WBMWD to meetrecycled water standards, the same percentage was used to estimate the amount of wastewatergenerated in the Culver City System that will be treated to meet recycled water standards. Theremaining 91 percent is assumed to be discharged into the Pacific Ocean. Table 4-11 lists theestimates of existing and projected volumes of treated effluent that will be discharged into thePacific Ocean. Table 4-12 was intentionally left blank as there are no existing uses of recycledwater by the GSWC customers in the Culver City System.Table 4-10:Estimates of Existing and Projected Wastewater Collection and Treatment in ac-ft/yr (mgd)for the Culver City System2005 (2) 2010 (2) 2015 2020 2025 2030 2035Projectedpopulation in 36,413 36,704 36,872 37,091 37,299 37,495 37,679service area (1)Wastewatercollected &3,059treated in (2.73 mgd)service area (3)3,084(2.75 mgd)3,098(2.77 mgd)3,116(2.78 mgd)3,134(2.80 mgd)3,150(2.81 mgd)3,165(2.83 mgd)Quantity thatmeets recycledwater standard275(0.25 mgd)278(0.25 mgd)279(0.25 mgd)280(0.25 mgd)282(0.25 mgd)283(0.25 mgd)Notes:1. For population projections see Section 2.3.2. Based on actual year.3. Values of wastewater collected and treated are estimated. For a description of the methodology, refer to the text.4. This table is based on the DWR Guidebook Table 21.285(0.25 mgd)Final Report, 2010 Urban Water Management Plan – Culver City Page 4-9Golden State Water Companyg:\adminasst\jobs\2010\1070001.00_gswc-uwmp\09-reports\9.09-reports\2011-08\grp3\gswc_culvercity_2010_uwmp-final.doc