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St Tammany Parish TMDL Response Plan – Progress in 2014

St Tammany Parish TMDL Response Plan – Progress in 2014. “Green & Grey Infrastructure for a Cleaner, Greener STP”. Elizabeth deEtte Smythe, Ph.D. LA Urban Stormwater Coalition October 1, 2014. The DRIVER: Water Quality Impairments. EPA 303(d) List of Impaired Waterbodies (2006-2010).

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St Tammany Parish TMDL Response Plan – Progress in 2014

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  1. St Tammany Parish TMDL Response Plan – Progress in 2014 “Green & Grey Infrastructure for a Cleaner, Greener STP” Elizabeth deEtte Smythe, Ph.D. LA Urban Stormwater Coalition October 1, 2014

  2. The DRIVER: Water Quality Impairments EPA 303(d) List of Impaired Waterbodies (2006-2010) Dissolved Oxygen Impairments in all watersheds from: • Individual Sewer Systems • Construction & Development • Illicit Discharges

  3. The TMDL ProcessTotal Maximum Daily Load The GOAL: Water Quality Improvement • Calibration Model - Current Conditions • TMDL Model – Projection to “worst case” conditions TMDL = Allowable quantity of pollutant to meet standard …“pollutant budget” TMDL = LA + WLA + MOS

  4. TMDL Implementation • LDEQ has established more stringent discharge limits • Phase I TMDL Implementation allocates changes to hundreds of permitted & unpermitted facilities • STP has begun implementation of WW & SW projects in response to TMDLs • CPRA has re-modeled TMDLs to determine potential DO improvements from the projects • St Tammany Parish must enforce through MS4 Permit (Stormwater Ordinance required) • Require BMPs for NPS • Plan for Regionalization/upgrades • Encourage more WW Assimilation projects

  5. The VEHICLE for WQ Improvement: STP MS4 Permit LDEQ Multiple Separate Storm Sewer permit (MS4)

  6. 37 TMDLs Prepared by EPA & LDEQ for • STP Impaired Waterbodies • TMDL = Allowable quantity of pollutant to meet WQ standard…“pollutant budget”

  7. The “DO TMDL Effect” on STP Dischargers Drastic reduction of discharge limits for LPDES permittees • Distinct areas where loadings must be reduced • “No Parish Action” will severely impact permittees in the next permitting cycle

  8. What we found out about STP aka “the DO TMDL Effect” • 530+ LPDES dischargers impacted in STP • Five significant areas of impact “Clusters” • 35 “hot spots” indicating “failed standards”

  9. Point & Nonpoint Source LOADS Create DO “Hot Spots” R#2 • “Hot spots” – (Red Circles) • Failed sites usually located near • Multiple Point Sources • Unsewered S/Ds • Failed sites characterized by • HIGH Nonpoint Source loads • in TMDL models R#4-6 R#10

  10. The DO TMDL Effect: STP Response • Establish “cluster” areas where Parish will link SW and WW projects for max benefit • Evaluate/develop strategy for reducing loadings at “hot spots” • Retrofit drainage projects by adding WQ improvement components • Review Parish laws and modify (if necessary) to meet WQ goals • Implement education/outreach program for permit holders and the public

  11. Four-Pronged Approach to Water Quality Improvement 1. Wastewater 2. Stormwater 3. Conservation & Mitigation 4. Education & Outreach An Integrated, “green” concept

  12. 1. WW Consolidation Program ($54.4 Million spent to date)

  13. 2. SW Management Program ($67.6 Million spent to date) Drainage projects present opportunities for WQ improvement

  14. 3. Coastal, Conservation & Mitigation Program ($38.6 million spent to date) Greenprint Conservation Priorities

  15. 4. Education & Outreach Program STP is active in WQ improvement Education & Outreach Programs • TMDL Outreach Meetings • BMP Workshops • WQ Task Force Meetings • LA Urban SW Coalition (LUSC) • Staff SW Certifications & Training • Clean Marina Workshops • Re-Tree St Tammany • World WQ Monitoring Day • Household HW Day

  16. TMDL Action Plan: SW Progress (2014) • SW Demonstration Ponds (various BMPs) • SW Retention Ponds (Planted w/wetland vegetation) • LPBF has completed Year 1 “Hot Spot” monitoring • WW improvements completed • CPRA has re-modeled TMDLs to determine potential DO improvements from projects

  17. Stormwater Demonstration & WQ Ponds

  18. “Hot Spots” Identified by TMDLs at Locations Failing DO Standards 34 “Hot spots” • Allows STP to analyze CAUSE of standards failure • Most HS are in streams determined to be: • Flow-limited (stagnant) • Intermittant • Wetland-dominated

  19. Casa Bella SD(Aeration BMP) • 25 homes • 2 schools (1250 students & staff) • Sewered SD

  20. Del Sol SDFloating Wetland BMP ($250,000) Bioremediation: Floating wetlands mimic natural functions, transforming nutrients & pollutants into forms that are useful for organisms • >250 homes in micro watershed • 150 Sewered • 100 Unsewered

  21. LaBarre Street Vegetative Planting BMP ($3.5 million) • 205 homes benefitting • Sewer connections under construction

  22. Little Creek Commercial Pond (Induced Flow BMP: HS-03) • drainage benefit • commercial & residential runoff • Benefit to 5 “hot spots”

  23. CPRA Model: WW Consolidation Program in Bayou Vincent Alton Eagle Lake MHP • Eagle Lake MHP removes 10,600 GPD (RKm 20.4) • Alton SD removes 34,100 GPD (RKm 16.5) • Estimated to Improve DO from ~1 mg/L 4.6 mg/L

  24. CPRA Model: Ben Thomas Road Pond (Flow Augmentation) IF Pond Eagle Lake MHP Alton Proposed Pond will improve drainage AND WQ in the area

  25. 7.5-Acre Tammany Hills SW Pond( Vegetative Planting) Volunteers planted over 500 trees in November 2012

  26. Tammany Hills SD(Vegetative Planting) • 401 homes benefitting • Unsewered SD

  27. CPRA Model: 7.5-Acre Tammany Hills Sewer Improvements & SW Pond ( Vegetative Planting) Sewer improvements SW/WQ Pond • Sewerage improvements to Tammany Hills SD (RKm 8.3) removes 215,000 GPD • Adding the SW/WQ Pond provides additional DO benefits

  28. 14-Acre Chinchuba SW Pond (Vegetative Planting ) Volunteers planted over 4400 trees in February 2013

  29. CPRA Model: 14-Acre Chinchuba SW Pond (Vegetative Planting) Sewer improvements SW/WQ Pond • Even with sewer and pond improvements will be inadequate to meet the current DO standard • Area is minimally developed & wetland dominated (naturally dystrophic) • LDEQ and EPA are working to produce a UAA, lowering the DO Standard to a more appropriate level.

  30. 90-Acre Cypress Bayou SW Pond (Vegetative Planting/Flow Augmentation$5.3 million) Volunteers planted over 4,000 trees & herbaceous shrubs in December 2013 IF Pond • Even with Induced Flow, the WQ improvements will be inadequate. • The area is minimally developed & wetland dominated (naturally dystrophic) • LDEQ and EPA are working to justify a UAA lowering the DO Standard to a more appropriate level.

  31. Parish Financial Commitments to Drainage/WQ ($160.6 Million) A substantial achievement for any local government

  32. TMDL Response: Proposed Projects (Estimated Costs $37 Million)

  33. Demonstrated WQ Improvement: 2012 303(d) List

  34. Questions?

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