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HomeMy WebLinkAboutCommittee Informational Item Disinfection optimization of Effluent Disinfection SANITq T�Dy Ron Coss 2 Environmental Laboratory and W; Ocean Monitoring � T�NG THE ENy\P 1 1 • 1 1 , Orange County Beaches N HB4 HB6 \ A� TM 15N12N SN 2` >.\ SAR Summers of 1999 and 2000 6N # JN \ �� ZERO Large stretch of Huntington Beach closed 78-inch outfa JS SS BS • due to elevated concentrations of enterococci • 15s bacteria (FIB) 120-Inc utf I Studies recognized several potential sources: potential sources: • Urban dry weather runoff • HBGS - Huntington Beach Generating Station • OCSD discharge • Bird droppings • OCSD's Coast-trunk line • Groundwater transport (spring tides) • Decaying infrastructure • No definitive source identified KEEP OUT ^ CountyOrange / Chlorine Use and Cost, BOD, and TSS from 2002-2013 12000000 — 10000000 8000000 $6,282,903 —Gallons 6000000 5,168,258 —Costl$) 4000000 $4,308,702 2000000 0 S635,632 70 60 50 mg/L 40 _ _BOD 30 —T55 20 10 Ewr 0 2002-03 2003-04 2004-OS 2005-06 2006-07 008-09 2009-10 2010-11 2011-12 2012-13 Orange County Sanitation I for you. OCSD's Water Quality Monitoring Program NORTH or • n.x xw> • • n.x z>w • ww zxo. nz• vlee "e z�s •COM SUO-8 sselwO. m. xm. xu. zlw oR •� PM R......I SUO--Sl.I.— x'.e xme Core Welar OUellly Stall— xlw OrangeDistrict you. _ Pi NORTH 0 2.5 5 kilometers Impacts to Biological Community near OCSD's Ocean DiS charg •55 .CON 059 .C2 .56 .0 Degraded Area .60 . 013 •21 07 • 022 036 .57 961 029 .17&5 037 .C4 044 020 0 • •63 11 •33 •62 025 •18 .17 023 065 .CS 64 .24 •`� •27 039 •42 041 .40 Ocean Bottom Monitoring Stations Affected Stations Normal Operations Disinfection : Enterococci Single le Monthly Geometric Fecal Indicator Bacteria Maximum Mean Total colitbrm(CFU per I I i10,000 ' 1000 7// NO \ z a Fecal colifionto(CFU per 10(1 400 200 • 3 a m n 124 ND 54t 32 25, 29 114 ND 5Z\ I mile ND outfal \ ND ND ND ND 8 4.5 mile \\ outfal 18 8 D February 10, 2014 OrangeMOWN Results of Special Study: Enhanced Disinfection NO — � z a m1 - e k ND klbmel6n ```♦ NO NO 8.3 `♦ NO �`♦ a 9.1 NO NO NO / 4 .� o ♦♦`♦♦ NO NO NO D ND. Qr d - ` 8.3 NO } A ND `�` NO ND 8.3 8.3 1 72 PI.M / NO `'22 NO 8.3 NO NO 12 NO NO B. NO NO N - . oecurD D sam�G. NO 8.3 okekye NO NO 8.3 NO OCYD1]Wtl� ♦ OWM1II ND September 10, 2012 Orange � f i 1'I A c� U � � c U) U m bA c O Next Steps 1 . Convene Expert Panel to advise on study to decrease and ultimately cease disinfection of ocean discharge. 2 . Conduct additional studies to gauge impacts to biological community and beach water quality as disinfection is decreased . 3 . Recommendations to Board of Directors 4. Continued engagement with regulators to possibly remove requirement to disinfect ocean discharge from next NPDES Ocean Discharge Permit. Orange County Sanitation District 999 I 11 I d I ilf I. 11 1 fl 1 III 1 1 II, I I ' f ; I' 11 111I I.IjflI f 1 I 1 1 II' p