HomeMy WebLinkAbout170907 NB Coastal Committee FINALIRWD Recycled Water Management
City of Newport Beach
Water Quality / Coastal Tidelands Committee
September 7, 2017
Presentation Agenda
1.Introduction to IRWD
2.IRWD Water Supply
Portfolio
3.Resource Recovery
4.Watershed Protection
5.Permit Amendment
6.Other / Questions
2
IRWD Basics:
An Introduction to the District.
Irvine Ranch Water District Service Area
181 Square Miles
20% of Orange County
530,000
Daytime Population
390,000
Residential Customers
6 Cities Served
Irvine
Lake Forest
Newport Beach
Tustin
Orange
Costa Mesa
Unincorporated Orange County
4
IRWD Services
Drinking Water
5 water treatment plants
27 Wells and 36 reservoirs
1,760 miles of water pipeline
Sewage Collection
1,070 miles of collection pipeline
Recycled Water
2 recycled water plants
525 miles of recycled water pipeline
Urban Runoff Treatment
IRWD San Joaquin Marsh
27 wetland treatment sites
5
IRWD Water Supply Reliability. Then and Now.
6
Total Water Demands: ~90,000 AF
66%9%
11%
14%
Imported Water
Clear Groundwater
Local Surface Water
Recycled Water
15%
36%28%
21%
Imported Water
Clear Groundwater
Local Surface Water
Recycled Water
Treated Groundwater
2016:Population Served: 390,000
Total Water Provided: 82,000 AF1990:Population Served: 114,000
Total Water Provided: 70,000 AF
IRWD Residential Water Use Trend
7
Gallons Per Capita Per Day Trend (1988-2016)
Resource Recovery:
Making efficient and sustainable use of locally
generated renewable resources.
Paradigm Shift:
From historical “disposal” of by-products:
–Water: Treated effluent to an ocean outfall.
–Gas: Biomethane flared off.
–Solids: Biosolids trucked to a landfill.
To recovering and beneficially reusing resources:
–Water: Reused to meet local needs.
–Gas: Biomethane used for energy generation and storage facilities.
–Solids: Fertilizer pellets produced from heat-dried biosolids residuals.
Why Resource Recovery from Sewage?
9
Biosolids Dewatering & Energy Recovery Project
Green and sustainable:
Biogas used to fuel facility.
Final Product:
Class A pellets used for fertilizer or fuel.
10
Facilities Sizing:
Will meet future solids handling needs.
Cost-effective:
Cost saving estimate at $288 million.
Watershed Protection:
Improving water quality in the Newport Bay.
IRWD Urban Runoff Treatment
Discharge into
sensitive receiving
waters
Dry weather runoff that
carries pollutants =
Over-irrigation =
Solutions:
1) Source Control Programs
2) Treatment Projects
San Diego Creek Watershed challenge:
San Diego Creek
Newport Bay
12
Urban Runoff Source
IRWD’s San Joaquin Marsh
13
•More than 300 acres of coastal freshwater wetlands.
•Direct improvement of water quality in Newport Bay.
•Helps region meet regulatory requirements.
•Enhances habitat and aesthetics, open space.
•Expands educational opportunities.
IRWD Natural Treatment System
14
•Expands wetlands treatment
throughout the San Diego Creek
watershed.
•31 sites selected; 27 sites complete.
•Integrated with city and county
Clean Water Act compliance
programs
(MS4 and NPDES permits).
•Partnerships with government,
private, regulatory and
environmental entities.
15
IRWD Natural Treatment System – Results
Cumulative removals:
•Nitrogen: 906,000 pounds
•Selenium: 1,350 pounds
•Copper: 2,046 pounds
•Total Coliforms” 99% reduction
•Sediment: 474 tons captured
Also, system annually removes
19,000 pounds of trash.
IRWD’s San Joaquin Marsh
and NTS: improving the
Newport Bay since 1999.
IRWD NPDES Permit Amendment:
Updating the permit for changing conditions.
IRWD Sewage / Recycled Water Flows
17
LAWRP
Tributary
Area
MWRP
Tributary
Area
LAWRP
MWRP
SOCWA
Outfall
Recycled Water Demands
To Customersand Seasonalstorage
Recycled
Water
Demands
Syphon / Rattlesnake
Imported
MWD
Untreated
Sand Canyon / San Joaquin
•Most IRWD sewage flows to
MWRP and LAWRP.
•IBC and Newport Coast sewage
flows are year-round.
•Sewage diversions to OCSD
primarily used when influent
exceeds MWRP treatment
capacity.
•Wintertime excess diversion of
recycled water occurs when
seasonal storage is full and
production exceeds demands.
•SOCWA Outfall is used when
LAWRP Tertiary is not needed.
Under typical operating conditions:
IRWD Sewage / Recycled Water Flows
18
•Recycled water demands (IRWD
and GAP) reduced to near zero.
•IRWD recycled water seasonal
storage is full.
•IRWD’s sewage flows to OCSD
restricted or eliminated; IBC and
Newport Coast flows don’t
change.
•IRWD recycled water flows to
OCSD Outfall maxed (~3 MGD)
•SOCWA Outfall for LAWRP
effluent and up to 3.0 MGD of
recycled water from MWRP.
•Sewage flows to MWRP and
LAWRP continue.
During a large storm event (Winter 2017):
LAWRP
Tributary
Area
MWRP
Tributary
Area
LAWRP
MWRP
SOCWA
Outfall
Recycled Water Demands
To Customersand Seasonalstorage
Recycled
Water
Demands
Syphon / Rattlesnake
Imported
MWD
Untreated
Sand Canyon / San Joaquin
MWRP NPDES Permit Amendment
Permit Amendment to incorporate Recycled Water:
–Routing fully treated and dechlorinated recycled water to the watershed under certain conditions.
–Distribution and use in Region 9.
Implementation Schedule:
–Draft permit amendment submitted to Regional Board for review and comment.
–Meet with Newport Beach Water Quality / Coastal Tidelands Committee in September 2017.
–Workshop(s) with stakeholders.
–Adopt amendment by Regional Board in 2018.
19
Questions
20
Paul A. Cook, P.E.
General Manager
Email: cook@irwd.com
Phone: (949) 453-5590