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HomeMy WebLinkAbout05.a.3) Handout-Sacto Regional Permit+ti 11 CO r 1 r T lsi ` � l kJ L _ an Francisco Regional Wateb +�� ]ualit ol Board t -;.... ° , "` L ! c a - ; • " 7: ti,•` J'\ i Best Practical Treatment and Control Based on Current Dischargers • Roseville • Woodland • Davis • El Dorado Hills • Manteca • Lodi • Galt • Stockton • Lincoln • Auburn • Vacaville • Fairfield- Suisun • etc BPTC = Ammonia Removal and Filtration for Body Contact Recreation Pa Delta POTW Dischargers Permitted Average Flow Cey d 9odmn RWCF Clyde ..WOOF CNdT.y WWTP G .bI CBD WWTF c y Tmn Dm8q WWTF / Ckyd B�wrtwoatl WWTP f Clyd RbWw WWTP— j Cq d Lod W M. Slapk WPCF 14 tons er day of ammonia/ 181 mqcA SRWTP B R.3o WWTP The other ten wastewater plants in this region are either currently treating their discharge for ammonia removal or in process of installing treatment equipment. What are the SRWTP issues? • Ammonia Removal due to toxicity, contribution to phytoplankton reduction and reduced dissolved oxygen downstream • Nitrate Removal to .26 m I ....at limits of technology... much more imited data on impacts but based on restoring the optimum ratio of Nitrogen /Phosphorus • Pathogen Removal via filtration and disinfection to full Title 22 (same level as our recycled water) particularly protozoan removal (Giardia & Crypto) • Reduction in chlorinated by products and chlorine residual violations suggest using Ultra Violet Disinfection • No Dilution Allowed..... all requirements met "end of pi a "...because no area of bypass for fish (current permit allows 14:1) 3 Why do we care? • Sacramento Regional Discharge ultimately reaches Suisun Bay where we discharge... contribute 90% of ammonia reaching Suisun Bay. • First permit issued since studies regarding ammonia link to pelagic organism decline have been publicized.... how will regulatory agencies view this work? • Central Valley Regional Board actions may set precedents for San Francisco Regional Board . 0 w4. I s 7 0 Our current permit allows for 10:1 dilution. Recent in -house study shows that higher number may be justified. Loss of dilution credits would be a significant issue for us........... Suisun Bay i iu� l.i[uf r. iY..' [ Who supports tentative Sac Regional discharge requirements with additional requirements? [[ Reducing ammonia/um, nitrate, and pathogens in the Bay -Delta today is critical to the effort towards a comprehensive solution to the overall Bay -Delta crisis." • Alameda County Water District • Alameda County Flood Control, Zone 7 • Contra Costa Water District • Kern County Water Agency • Metropolitan Water District of Southern California • San Luis & Delta Mendota Water Authority • Santa Clara Valley Water District • State & Federal Contractors Water Agency • State Water Contractors • Westlands Water District 5 vMili r �? 1 Our current permit allows for 10:1 dilution. Recent in -house study shows that higher number may be justified. Loss of dilution credits would be a significant issue for us........... Suisun Bay i iu� l.i[uf r. iY..' [ Who supports tentative Sac Regional discharge requirements with additional requirements? [[ Reducing ammonia/um, nitrate, and pathogens in the Bay -Delta today is critical to the effort towards a comprehensive solution to the overall Bay -Delta crisis." • Alameda County Water District • Alameda County Flood Control, Zone 7 • Contra Costa Water District • Kern County Water Agency • Metropolitan Water District of Southern California • San Luis & Delta Mendota Water Authority • Santa Clara Valley Water District • State & Federal Contractors Water Agency • State Water Contractors • Westlands Water District 5 Who is concerned that new requirements are too aggressive? • BACWA • CASA • TriTac (League of Cities /CASA/CWEA) • CCCSD • Sacramento Regional Sanitation District Was commenting our best strategy? • Additional treatment at SCRSD improves the quality of Suisun Bay, where we discharge. • Requirements for levels of treatment that will not measurably improve water quality to support beneficial uses are not a good use of public monies. • On balance decided that measured comments were best approach..... asked to consider cost : benefit. • Our focus should be working with our own Regional Board on studies they are conducting on ammonia and nitrate impacts in Suisun Bay. • Our permit will expire March 31, 2012......... stay tuned.