SANTA MARIA WATERSHED TMDL STAKEHOLDER MEETING€¦ · – California State Office of Environmental...
Transcript of SANTA MARIA WATERSHED TMDL STAKEHOLDER MEETING€¦ · – California State Office of Environmental...
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SANTA MARIA WATERSHED
TMDL STAKEHOLDER
MEETING
January 25, 2011
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Today’s Format
• Introductions
• Presentations:
– Overview, schedule, status (Chris Rose)
– Nutrient Module (Larry Harlan)
– Pesticide Module (Peter Meertens)
• Questions and discussion
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WATERSHED TMDL
• Single TMDL ProjectSanta Maria Watershed
• Addressing all watershed impairments
• > 90 impairments (pollutant/waterbody)– Nitrate, ammonia, dissolved oxygen…
– Fecal coliform, Total coliform
– Toxicity, sediment toxicity, pesticides…
– Chloride, sodium, boron
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WATERSHED TMDL CON’T.
• Master Implementation Plan
– Implementation plan addressing all
impairments
– Economy of implementation
– Economy of planning
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POLLUTANT MODULES
• “Module:” is a means of discussing a group of impairments.
– Grouping of impairments
• Bacteria-related
• Nutrient-related
• Pesticide-related
• Salts-related
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POLLUTANT MODULES
Con’t.
• TMDL Module Report
– Report
• Informational and technical portions of a
TMDL
• Contains USEPA required elements
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PATH TO
REGIONAL BOARD APPROVAL
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synthesis
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Implementation Plan
Regional Board Approval
USEPA APPROVED MODULES
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SCHEDULE
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July 2010 - June 2011
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DRAFT SCHEDULE CON’T.
SALTS
MODULE
DEVELOP MASTER IMPLEMENTATION PLAN
July 2011 - June 2012
WATER BOARD
APPROVAL
BASIN PLAN
AMENDMENT
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Status: Nutrient/Pesticide Modules
• Data Compilation– Completed
• Impairment Assessment– Completed
• Numeric Target Development/Source Analysis– January-June 2011
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STAKEHOLDER INPUT:
UPCOMING OPPORTUNITIES
• Nutrient and Pesticide Modules
– Draft report: June 2011
• Salts Module
– Draft report: ~Fall 2011
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Nutrient Module Update
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Development of TMDLs for Development of TMDLs for
Nutrients in Santa Maria Nutrients in Santa Maria
River and Oso Flaco Lake River and Oso Flaco Lake
WatershedsWatersheds
Oso Flaco Lake
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Topics TodayTopics Today……
•• Waterbodies AddressedWaterbodies Addressed
•• Pollutants AddressedPollutants Addressed
•• Approaches to Numeric Target Approaches to Numeric Target
DevelopmentDevelopment
•• Numeric Target ExamplesNumeric Target Examples
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Impaired WaterbodiesImpaired Waterbodies1.1. Blosser ChannelBlosser Channel
2.2. Bradley ChannelBradley Channel
3.3. Bradley Canyon CreekBradley Canyon Creek
4.4. Cuyama River (above Reservoir)Cuyama River (above Reservoir)
5.5. Green Valley CreekGreen Valley Creek
6.6. Little Oso Flaco CreekLittle Oso Flaco Creek
7.7. Main Street CanalMain Street Canal
8.8. North Main Street ChannelNorth Main Street Channel
9.9. Nipomo CreekNipomo Creek
10.10. Orcutt CreekOrcutt Creek
11.11. Oso Flaco LakeOso Flaco Lake
12.12. Oso Flaco CreekOso Flaco Creek
13.13. Santa Maria RiverSanta Maria River
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Pollutants AddressedPollutants Addressed
•• Nitrogen (Nitrate and TN)Nitrogen (Nitrate and TN)
•• Unionized AmmoniaUnionized Ammonia
•• PhosphorusPhosphorus
•• Dissolved OxygenDissolved Oxygen
•• TemperatureTemperature
•• TurbidityTurbidity
•• pHpH
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Impaired WaterbodiesImpaired Waterbodies
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Numeric Target
Development
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Numeric Target ApproachesNumeric Target Approaches
• Existing Water Quality Objectives
• US EPA Guidance for Nutrient Criteria
• CA Nutrient Numeric Endpoints (NNE)
• Current Draft Targets and Other TMDLs
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Water Quality Objectives
• Numeric Objectives
– Nitrate: 10 mg/L-N
– Unionized ammonia: 0.025 mg/L-N
– Dissolved oxygen: 7 mg/L
– Temperature:
• Gen. Obj.: no alteration
• COLD: cannot ∆ 5 F
– pH:
• Gen/COLD: 7-8.5
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Water Quality Objectives Con’t.
• Narrative Objectives
– Biostimulatory Substances
• Discharges cannot cause aquatic growths such
that they are a nuisance.
– Toxicity
• All waters shall be maintained free of toxic substances
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US EPA Nutrient GuidanceUS EPA Nutrient Guidance
•• USEPA Guidance for USEPA Guidance for
Ecoregion IIIEcoregion III--66
•• TN: 0.52 mg/LTN: 0.52 mg/L--NN
•• TP: 0.03 mg/LTP: 0.03 mg/L--PP
U.S. EPA, 2000. Nutrient Criteria Technical Guidance Manual, Rivers and Streams. U.S.
Environmental Protection Agency, Office of Water, Washington D.C., EPA-822-00-002.
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CA NNE ApproachCA NNE Approach
• Model Developed for State of CA
• Predictive Biostimulatory Risk
– Algal density
– Aquatic life protection
• Supported by USEPA
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CA NNE Approach CA NNE Approach ConCon’’tt
• Input parameters:
– Shading
– Water depth
– Canopy Cover
– Water Velocity
– Solar Radiation
• Output
– Total nitrogen, Total phosphorus
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Example Numeric Targets
TN mg/L-N TP mg/L-P TN mg/L-N TP mg/L-P
WQO 10
USEPA 0.52 0.03 0.52 0.03
NNE (CC) 2.9 0.045 1.6 0.028
NNE (SM) 3.5 0.22 1.6 0.2
WARM COLD
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Pesticide Module Presentation
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SANTA MARIA WATERSHED
TMDL PESTICIDE MODULE
JANUARY 25, 2010
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Introduction
• Water quality objectives
• Pollutants
• Listings and additional impairments
• Strategy for developing targets and targets being considered
• Strategy for source analysis
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Water Quality Objectives
• All waters shall be maintained free of toxic substances
• No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses. There shall be no increase in pesticide concentrations found in bottom sediments or aquatic life.
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Pesticides Addressed
• Legacy OrganoChlorine Pesticides
• Currently Applied OrganoPhosphate and Pyrethroid Pesticides
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OrganoChlorine Pesticides
• Dieldrin
• Endrin
• Toxaphene
• DDT
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OrganoPhophate (OP) Pesticides
• Chlopyrifos
• Diazinon
• Malathion
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Pyrethroid Pesticides
• Bifenthrin
• Cyfluthrin
• Cypermethrin
• Esfenvalerate
• Lambda-Cyhalothrin
• Permethrin
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Listings and Additional Impairments
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Listings
chlorpyrifos, diazinonMain Street Channel
chlorpyrifosBradley Channel
chlorpyrifosGreen Valley Creek
dieldrin, ddt, chlorpyrifos, diazinonOrcutt Creek
dieldrinOso Flaco Lake
dieldrin, endrin, toxaphene, ddt, chlorpyrifos
Santa Maria River
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Exceedances in Addition to Listings
ddt, chlorpyrifos, diazinon, pyrethroidsBlosser Channel
ddt, malathionOso Flaco Creek
ddt, diazinon, pyrethroidsBradley Channel
ddt, pyrethroidsMain Street Channel
pyrethroidsOrcutt Creek
chlordane, ddtOso Flaco Lake
diazinon, pyrethroidsSanta Maria River
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Numeric Targets
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Approach for developing targets
The Water Board will consider relevant numerical criteria and guidelines developed and/or published by other agencies and organizations
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Types of Targets for the TMDL
• OrganoPhosphate (water)
• Pyrethroid Pesticides (water, sediment)
• OrganoChlorine (tissue, water, sediment)
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Numeric Target Examples
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OrganoPhosphate Targets
(water)
0.17malathion
0.16diazinon
0.025chlorpyrifos
CMC(ug/L 1-hr. avg.)
Pesticide
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Pyrethroid Targets
(water)
0.51Lambda_Cyh.
0.050.3Cyfluthrin
0.64Bifenthrin
Chronic Criteria
(ng/L)
Acute Criteria
(ng/L) Pesticide
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Pyrethroid Targets (sediment)
10.83Permethrin
0.45Lambda
Cyhalothrin
1.54Esfenvalerate
0.38 Cypermethrin
1.08Cyfluthrin
0.52Bifenthrin
LC 50 (ug/g oc)Chemical
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OrganoChlorine Targets
• Tissue:– California State Office of Environmental Health Hazard
Assessment developed fish Contaminant Goals and Advisory Tissue Levels
• Water:– California Toxic Rule aquatic life criteria
• Sediment:– National Oceanic and Atmospheric Administration (NOAA)
and contained in NOAAs Screening Quick Reference Tables
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Source Assessment Strategy
• Landuse assessment in watershed
• Pesticide Use Reporting Database
• Source analysis studies and reports
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DISCUSSION