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HomeMy WebLinkAboutPPP Cessation of disinfection of OCSD's ocean discharge 9-3-14 o NjRy SANI TqT o� FF We' re here for you . r Q 9 h 9or�cl/N� 7HE EN�AQ��W= Orange • Sanitation District • �� � �vp � Orange County Sanitation District We're here for you. TIMELINE • August 2002: Began effluent disinfection w/bleach61U Omsk! • July 2005 : Initial decline in benthic community near the outfall • July 2008: GWRS targets 70 MGD reclaimed effluent • January 2009 : GWRS increased to 90 MGD, acceleration in benthos population decline • March 2011: Full secondary treatment achieved, effluent chlorination use decreased by 90% • January 2012: Initial recovery seen in benthic community Disinfection and Beach Water Quality Studies conducted from 1999-2003 and recent special OCSD studies/projects indicate: • Discharge from OCSD outfall does not impact beach water quality • Local and natural source(s) are causing infrequent high levels of enterococci bacteria at Huntington Beach, CA • Results from J-112 Enhanced Disinfection Project • Dry weather urban runoff diversions have reduced beach bacteria levels • Effluent disinfection has no benefit on beach water quality • No overall change in beach water quality between pre-disinfection and periods y -Jfi Orange County Sanitation Total Effluent Heavy Metals — — Influent Flow 2500 500 2000 400 I b 1500 300 S _ M a 1000 ~ — 200 Y 500 100 0 0 77 80 83 86 89 92 95 98 01 04 07 10 13 300 3.50 3.00 250 2.S0 200 2.00 150 1.50 100 1.00 SO 030 —Outfall Flow (MGD) —TSS (1000 Ibs/day) —OC Population (Millions; right a) is) 0 0.00 ti°'10ti°'1bti°j111°'10ti°10ti°�sOti°'�,ti°'t'Lti°j0�ti°j%Ati°'�yti°'�bti°��1NC5 N°'� No Nolti°p'1ti°�'�No No N btiO "00tio'0'LfOb�Nb�bb��'L�Ab�y'L�bbf1'L�0b�0b��Ob�1�'LO1b� Independent Advisory Panel Meeting "Mosher, E` Enector National Water Research Institute 0 e 0 {�. ,u p• 0,ting New Sources www."w"°s org/ -cam. oEnvironmentalHealth �� 444 George Tchobanoglous panel chair v CALIFORNIA ENVIRONMENTAL PROTECTION AGENCY SANTA ANA REGIONAL WATER QUALITY CONTROL BOARD I l naps and Nancy skinner Coastal/Bay City Counsel Meeting Oe�gWPpQjO Water Y Fn Citizens ♦ '� '► J m Advisory .I o �� Committee -- i', i 77. CG.,.YGu'. . • gttrov.► Meetine / Ora tal Coalitio w" """ °""°°' _gronbe°"beagpo/ I Orange County Sanitation District We're here for you. bttOJ/°Nov.rom/ - Summary 1. Disinfection is environmentally harmful esp. on the benthic community around the outfall 2. No health benefit on local beach water quality 3. Unnecessary cost to ratepayers 4. NWRI panel recommended ceasing disinfection 5. Stakeholder feedback has endorsed ceasing disinfection The Next Steps 1. OCSD will continue Public Outreach and Stakeholder Input 2. Requested regulators to re-open ocean discharge permit to eliminate disinfection requirement IMF , I ,1yI p , ,,r : I, � fir, ; �� ,► , ��� �I ,I 01 I 1 �I.I V 1t'', I I S II l � i I ` �II I'� ,q �++''#VIA► fl III q', 11 � � �,' y I ''I� � RW�I'��I��h�l�,�a�i� tad 1 i . �,�► tN OCSD's Beach Monitoring OCSD begins diverting and OCSD begins disinfection on Special demonstration study:Enhanced disinfection treatiny August 2002 from July 31—Sept.10,2012 1998 1999 20001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 AB411 Standards USGS Study:OCSD outfall Changes in aquatic life observed in OCSD achieves full secondary plume does not impact beach 2005,correlation with chlorine treatment contamination Orange County Sanitation I for you. _ Q Orange County Sanitation District We're here for you. HuntingtonPotential Sources Huntingtn� Beach - - - - - _ - Ta berfStorm in Channel Tahberfl%Mh t.. Santa Ana River Orange County Sanitation District We're here for you.