HomeMy WebLinkAboutCommittee Informational Item Disinfection optimization of Effluent
Disinfection
SANITq T�Dy
Ron Coss
2 Environmental Laboratory
and
W; Ocean Monitoring
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Orange County Beaches
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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
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8000000
$6,282,903 —Gallons
6000000 5,168,258 —Costl$)
4000000
$4,308,702
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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
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Impacts to Biological Community near
OCSD's Ocean DiS
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Ocean Bottom Monitoring Stations Affected Stations
Normal Operations Disinfection : Enterococci
Single
le Monthly Geometric
Fecal Indicator Bacteria
Maximum Mean
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February 10, 2014
OrangeMOWN
Results of Special Study: Enhanced Disinfection
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September 10, 2012
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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
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