• 3/24/2009


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    • Abstract: 3/24/2009Los Angeles River MetalsTotal Maximum Daily Load(TMDL) Implementation PlanTMDL)Stakeholder Workshop 1March 25, 20091

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3/24/2009
Los Angeles River Metals
Total Maximum Daily Load
(TMDL) Implementation Plan
TMDL)
Stakeholder Workshop 1
March 25, 2009
1
Opening Remarks
2
Stakeholder Introductions
3
1
3/24/2009
Agenda
Background
Stakeholder Participation
Metals TMDL Implementation Plan
Development Process
– Characterization
– Potential Green Strategies
– Development of Alternatives
– Quantitative Nexus
Next Steps
4
Background
5
Total Maximum Daily Load (TMDL)
A TMDL specifies
the maximum
amount of a
specific pollutant
that
th t can enter and
t d
assimilate into a
specific receiving
waterbody without
causing
impairment to the
ecosystem.
6
2
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Regulatory Context
Federal and State Statutes
Clean Water Act
Porter-Cologne Act
State Water Quality Standards Regulations
Ocean Plan (State Board)
Basin Plans (Regional Board)
Biennial Water Quality NPDES Permits
Assessment (Regional Board)
(Regional Board) Wasteload allocations Required by the City of Los Angeles
incorporated into
wastewater and MS4 and all responsible parties
NPDES Permits
303(d) List
of Impaired Waters
TMDL Implementation Plans
(State Board & EPA)
Coordinated Monitoring Plan
TMDL Development and
Wasteload Allocations
(Regional Board & EPA)
7
LA River Pollutants of Concern
Metals TMDL:
– Cadmium, Copper, Lead, Zinc, and Selenium
Other TMDLs:
– Trash
– Nutrients (no stormwater targets)
303(d) List:
– Bacteria
– Cyanide
– Diazinon (pesticide)
– Oil
– 1,1-DCE, PCE, TCE
8
Los Angeles River Metals TMDL
The Los Angeles River Metals TMDL sets a
limit to the amount of metals that are
allowed to enter the Los Angeles River
The Implementation Plan will describe
how the City will reduce the amount of
metals currently entering the Los Angeles
River
9
3
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Purpose
Total Maximum Daily Load (TMDL)
Implementation Plan: to improve water
quality and meet regulations
Stakeholder Workshops: to provide input
on the development of the Implementation
Plan
10
Stakeholder Participation
11
Stakeholder Participation
Workshop 1: Introduction/Watershed
Characterization
Workshop 2: Potential Green BMP
Strategies (June 2009)
Workshop 3: BMP Alternatives Plan (Sept
2009)
12
4
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Stakeholder Participation
Integration with other plans
– LA River Revitalization Plan
– City of Los Angeles Integrated Resource Plan
– City of Los Angeles Water Quality Compliance
Master Pl f U b R
M t Plan for Urban Runoff ff
– LA County Integrated Regional Water
Management Plan
– Tujunga/Pacoima Watershed Plan
– Others
Opportunities for collaboration
13
Metals TMDL Implementation
Plan Development Process
14
Implementation Plan Development
Process
Characterization
Potential Green Strategies
Development and Refinement
of Alternatives
Quantitative Nexus
TMDL-specific
Implementation Plans
15
5
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Implementation Plan Due Dates
Draft Metals TMDL Implementation Plan
due to Regional Board:
January 11, 2010
Final Metals TMDL Implementation Plan
due to Regional Board:
July 11, 2010
16
Compliance Timeline
Deadlines: Percent of Drainage Area that must meet
Waste Load Allocation (WLA) by date shown
Dry Weather
50% 75% 100%
2012 2020 2024 2028
25% 50% 100%
Wet Weather
17
Step 1: Characterization
Characterization
Potential Green Strategies
Development and Refinement
of Alternatives
Quantitative Nexus
TMDL-specific
18
Implementation Plans
6
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Los Angeles
River
Watershed
LA River is 55
miles long
LAR
Watershed is
834 square
miles (534,700
acres)
City of Los
Angeles is
33% of the
watershed
area (45% of
urban area) 19
Los Angeles
River
Watershed
LA River is 55
miles long
LAR
Watershed is
834 square
miles (534,700
acres)
City of Los
Angeles is
33% of the
watershed
area (45% of
urban area) 20
Reaches
of the
Los
Angeles
River
The TMDL
subdivides
bdi id
the LA River
into six
reaches
21
7
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Reaches
of the
Los
Angeles
River
The TMDL
subdivides
bdi id
the LA River
into six
reaches
22
Land Use
23
LA River
Watershed
Topography
24
8
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Rain Event
Depth for
Typical
Storm
25
Watershed Water Quality
Compile available water quality
monitoring data
– City of LA Status and Trends
– LA County Monitoring Data
– Water Reclamation Facilities
– SCCWRP studies
– Southern California Marine Institute
Analyze existing monitoring data for all
pollutants of concern
– Identify trends
– Compare to TMDL
Prioritizing pollutant loading areas of
concern 26
Basis for Prioritizing Areas
Subdivide Develop
Estimate Determine
Watershed Catchment
Pollutant Prioritization
into Smaller Area
Loadings Factor
Areas Priorities
27
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Subdivide
Watershed
into Smaller
Catchments
28
Estimating Storm Event Pollutant
Loading: Copper
Low
Low - Moderate
Moderate
Moderate – High
High
29
Estimating Storm Event Pollutant
Loading: Zinc
Low
Low - Moderate
Moderate
Moderate – High
High
30
10
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Multiple Pollutant Catchment
Prioritization Index (CPI)
Low
Low - Moderate
Moderate
Moderate – High
High
31
Step 2: Potential Green Strategies
(Detailed Discussion in Workshop 2)
Characterization
Potential Green Strategies
Development and Refinement
of Alternatives
Quantitative Nexus
TMDL-specific
32
Implementation Plans
Potential Green Strategies
Non-structural / Institutional BMPs
Structural BMPs
– Distributed
– Regional/Sub-regional
33
11
3/24/2009
Potential Green Strategies
Examples of Non-Structural / Institutional
BMPs:
– Development and Redevelopment Design
Standards
– Downspout Redirect Program
– Product Substitution (e.g. copper brake pads)
– Enhanced street sweeping and catch basin
cleaning
– Education: recycling used oil, proper car washing,
restaurant trash handling, etc.
34
Potential Green Strategies
Examples of Distributed Structural BMPs:
– Cisterns
– Bioretention
– Permeable Paving
– Gross Solids
Removal Devices
– Drain Inlet Inserts
and Filters
– Street and Parking Lot
Biofiltration Retrofits
35
Potential Green
Strategies
Examples of Regional/
Subregional BMPs:
– Detention
– Infiltration
– Natural Treatment
Systems
(e.g. wetlands)
– Treatment Facilities
36
12
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Step 3: Development of
Alternatives
(Detailed Discussion in Workshop 3)
Characterization
Potential Green Strategies
Development and Refinement
of Alternatives
Quantitative Nexus
TMDL-specific
37
Implementation Plans
Step 3: Development of Alternatives
BMP Selection and Prioritization based
on:
– Performance (load and volume reduction)
– Implementability
– Other benefits/constraints
– Cost
38
Step 4: Quantitative Nexus
(Detailed Discussion in Workshop 3)
Characterization
Potential Green Strategies
Development and Refinement
of Alternatives
Quantitative Nexus
TMDL-specific
39
Implementation Plans
13
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Step 4: Quantitative Analysis
Quantify pollutant reductions expected
under the BMP Alternatives Plan
Consider ongoing studies by City, County,
and Others
Evaluate potential for compliance with
TMDL (Target Concentrations)
40
Next Steps
Next Stakeholder Workshop will be in
June 2009
– Topic: Potential Green Strategies
41
Contacts
Watershed Protection Division
Morad Sedrak, Project Manager
[email protected], 213-485-3951
Seth Carr, Project Engineer
[email protected], 213-485-3961
42
14


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