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NORTH CENTRAL TEXAS REGIONAL WET WEATHER CHARACTERIZATION PROGRAM15th Annual EPA Region 6 Stormwater Conference
Jeff RiceEnvironment and Development PlannerNorth Central Texas Council of Governments
Chad RichardsProject ManagerAtkins
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Overview
● Background● Chemical Monitoring● Biological Monitoring● Data Review and Comparisons● On-line Data Viewer● Status of the Program● Questions
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Background
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NCTCOG
● North Central Texas Council of Governments (NCTCOG)
● Voluntary association of, by and for local governments
● Assist local governments– Planning for common needs– Cooperating for mutual benefit– Coordinating for sound regional development
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NCTCOG
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Regional Partnership
● Regional Monitoring Program coordinated by NCTCOG
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● Participants– Arlington– Dallas– Fort Worth– Garland– Irving– Mesquite
– Plano– Texas Department of
Transportation (TxDOT) –Dallas and Fort Worth Districts
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Application Phase
● 1992 – 1994● Small, single land use watershed sampling● 30 monitoring sites● 188 constituents● 210 samples● Analysis of results
– 15 redundant monitoring sites– Almost half of parameters never detected– Of those detected only portion merited further study
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First Term
● 1997 – 2001● 22 monitoring sites
– 15 from previous network (small single land use watersheds)
– New sites: 3 mixed land use, 3 in-stream, 1 developing watershed
● 33 constituents● 330 samples● Partners felt results did not characterize impact
on receiving waters
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RWWCP
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● Partners proposed plan to switch to in-stream monitoring
● NCTCOG Regional Wet Weather Characterization Program (RWWCP)
● Participants– Arlington– Dallas– Fort Worth– Garland– Irving– Mesquite
– Plano– North Texas Tollway Authority
(NTTA)– Texas Department of
Transportation (TxDOT) –Dallas District
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RWWCP
● Permit option approved by TCEQ● Baseline data establishment
– Determine long-term water quality trends;– Assess the impact of stormwater discharge on receiving
stream quality; and – Potential tool to evaluate BMP effectiveness.
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RWWCP Second Term
● 2006 – 2010– 3 years in-stream sampling– 24 watersheds sampled– 77 sampling stations– Each watershed sampled 1 year– 1 sample per quarter/per site (except Fort Worth)– 285 samples collected
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RWWCP Third Term
● 2011-2016– 4 years in-stream sampling (except Fort Worth)– 24 watersheds– 48 sample stations– Each watershed sampled 2 years– 1 sample per quarter/per site (except Fort Worth)– 380 samples total– 132 samples collected to date
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Chemical Monitoring
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Chemical Monitoring Periods
● January 1 – March 31● April 1 – June 30● July 1 – September 30● October 1 – December 31
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Chemical Monitoring Requirements
● Rain event greater than 0.1 inches;● Preceding antecedent dry period of at least 72-
hours; and● Stream level must have a measurable rise
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Chemical Monitoring Constituents
● E. coli● Total Coliforms● Oil and Grease● pH● BOD● COD● TSS● TDS● Diazinon
● Dissolved Phosphorus● Total Phosphorus● Total Nitrogen● Total Cadmium● Total Copper● Total Lead● Total Zinc● Total Chromium● Total Arsenic
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● Carbaryl● Diazinon
● Total Cadmium
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Equipment
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Challenges
● Vandalism● Flooding● Theft● Severe Weather
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Vandalism
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Vandalism
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Flooding
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Severe Weather
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Biological Monitoring
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Rapid Bioassessments
● Fort Worth– Second Term: 72 bioassessments completed under
RWWCP
● Dallas– Bioassessments conducted since 2005 outside of
RWWCP
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Third Term 2012
● Fort Worth– 24 bioassessments– 6 watersheds
● Dallas– 8 bioassessments– 4 watersheds
● Garland– 2 bioassessments– 1 watershed
● Plano– 2 bioassessments– 1 watershed
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Biological Monitoring
● Modifications between entities● TCEQ, EPA guidance manuals● Habitat assessment● Physical conditions● Macroinvertebrates● Other biota● Reference sites
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Protocols
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Habitat Fish Benthos
Fort Worth EPA Electrofisher Surber
Dallas TCEQ No fish Kick-net and other substrates
Plano TCEQ Electrofisher and seines Kick-net
Garland TCEQ Electrofisher and seines Kick-net
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Seining
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Backpack Electrofisher
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Kick-net
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Largemouth Bass
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Smallmouth Buffalo
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Mussels
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Data Review and Comparisons
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Chemical Monitoring Data Review
● Second Term● Data was considered baseline● Not traditional outfall monitoring● As an initial data set, not robust enough to make
solid statistical analyses
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Chemical Monitoring Data Review
● Consistent pollutant concentrations between watersheds with a general decrease of concentrations from upstream to downstream
● Water quality generally yielded higher pollutant concentrations during warm months
● No statistical difference between long and short antecedent dry periods
● Larger storms generally produced higher in-stream concentrations
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Chemical Monitoring Data Review
● Wet-weather in-stream concentrations are typically higher than Clean Rivers Program (generally collected during dry weather)
● Certain wet-weather in-stream concentrations were higher than outfall samples, certain wet-weather in-stream pollutants were lower (NSQD and Prior North Texas NPDES data)
● Currently there are no wet-weather in-stream water quality standards by the EPA or State of Texas to use as benchmarks or comparison values
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Chemical Monitoring Data Review
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Disclaimer
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● Very preliminary 3rd term data analysis● Small “n” values● Statistical analysis not performed● Visual analysis● Opinion of the presenter● Not all constituents shown for brevity
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Chemical Monitoring Data Review
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Chemical Monitoring Data Review
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Chemical Monitoring Data Review
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Chemical Monitoring Data Review
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Chemical Monitoring Data Review
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Chemical Monitoring Data Review
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Chemical Monitoring Data Review
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Chemical Monitoring Data Review
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Chemical Monitoring Data Review
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Chemical Monitoring Data Review
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Biological Monitoring Data Review
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Limited Intermediate High Exceptional
Fort Worth
Dallas
Plano
Garland
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On-Line Data Viewer
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On-Line Data Viewer
● Internet browser – view previous and current sampling activities
● Google-based station maps ● Zoom in to site locations● Allows stakeholders to view data in their
neighborhood● Ability to retrieve sampling event data● Data exportable● Visit: www.dfwstormwater.com
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Status of the Program
● Continue monitoring for 3 years (except Fort Worth – 4 years)
● Data available on-line with interactive map for public access
● Continue to establish baseline data on receiving streams in the DFW Metroplex
● Develop and explore uses of the data● Develop proposal for next permit term based on
data analysis and regulatory environment
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Questions?Jeff Rice(817) 695-9212616 Six Flags Drive, Centerpoint TwoArlington, Texas [email protected]
Chad Richards(281) 529-42001250 Wood Branch Park Drive, Suite 300Houston, Texas [email protected]