st tammany parish tmdl response plan – progress in 2014

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

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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). - PowerPoint PPT Presentation

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TMDL Response Plan - Wastewater

St Tammany Parish TMDL Response Plan Progress in 2014

Elizabeth deEtte Smythe, Ph.D.LA Urban Stormwater CoalitionOctober 1, 2014Green & Grey Infrastructure for a Cleaner, Greener STP1The DRIVER: Water Quality Impairments Dissolved Oxygen Impairments in all watersheds from:Individual Sewer Systems

Construction & Development

Illicit Discharges

EPA 303(d) List of Impaired Waterbodies (2006-2010)2Calibration Model - Current ConditionsTMDL Model Projection to worst case conditions

TMDL = Allowable quantity of pollutant to meet standard pollutant budgetTMDL = LA + WLA + MOS

The GOAL: Water Quality ImprovementThe TMDL ProcessTotal Maximum Daily Load3TMDL 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 NPSPlan for Regionalization/upgradesEncourage more WW Assimilation projects

4

The VEHICLE for WQ Improvement:STP MS4 Permit

LDEQ Multiple Separate Storm Sewer permit (MS4)537 TMDLs Prepared by EPA & LDEQ for STP Impaired WaterbodiesSubsegmentWaterbodyImpairment40802Tchefuncte RiverBOD (13)4080340901Bayou Lacombe4090240903Bayou Cane4090440905Bayou Liberty40906Bayou Paquet40907Bayou Vincent40908Bayou Bonfouca90105Pearl River Navigation Canal9020490207Middle & West Middle River40909W-14 Diversion CanalFecal Coliform (4)40910Salt Bayou90101Pearl River90207Middle & West Middle River40801Tchefuncte RiverMercury (13)40905Bayou Liberty40906Bayou Paquet90101Pearl River9010790102East Pearl River9010390105Pearl River Navigation Canal9020490106Holmes Bayou90201West Pearl River90205Wilson Slough90207Middle & West Middle River90105Pearl River Navigation CanalNitrate (3)9020490207Middle & West Middle River40903Bayou CaneTSS90106Holmes BayouTurbidity (3)90201West Pearl River90202Morgan RiverTotal 37TMDL = Allowable quantity of pollutant to meet WQ standardpollutant budget6The DO TMDL Effect on STP DischargersDistinct areas where loadings must be reduced

No Parish Action will severely impact permittees in the next permitting cycle

Drastic reduction of discharge limits for LPDES permittees7What we found out about STP aka the DO TMDL Effect530+ LPDES dischargers impacted in STP

Five significant areas of impact Clusters

35 hot spots indicating failed standards

8Point & Nonpoint Source LOADS Create DO Hot Spots

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 modelsR#10R#2R#4-69The DO TMDL Effect: STP ResponseEstablish 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 public10Four-Pronged Approach to Water Quality Improvement1. Wastewater2. Stormwater3. Conservation & Mitigation 4. Education & Outreach

An Integrated, green concept111. WW Consolidation Program ($54.4 Million spent to date)

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2. SW Management Program ($67.6 Million spent to date)Drainage projects present opportunities for WQ improvement133. Coastal, Conservation & Mitigation Program ($38.6 million spent to date)

Greenprint Conservation Priorities144. Education & Outreach Program 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

STP is active in WQ improvement Education & Outreach Programs15TMDL Action Plan: SW Progress (2014)SW Demonstration Ponds (various BMPs)SW Retention Ponds (Planted w/wetland vegetation)LPBF has completed Year 1 Hot Spot monitoringWW improvements completed CPRA has re-modeled TMDLs to determine potential DO improvements from projects

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Stormwater Demonstration & WQ Ponds17Hot Spots Identified by TMDLs at Locations Failing DO StandardsAllows STP to analyze CAUSE of standards failure

Most HS are in streams determined to be: Flow-limited (stagnant) Intermittant Wetland-dominated

34 Hot spots

18Casa Bella SD(Aeration BMP)

25 homes2 schools (1250 students & staff) Sewered SD19

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 Unsewered20LaBarre Street Vegetative Planting BMP ($3.5 million)

205 homes benefitting Sewer connections under construction

21Little Creek Commercial Pond (Induced Flow BMP: HS-03)

drainage benefit commercial & residential runoffBenefit to 5 hot spots22CPRA Model: WW Consolidation Program in Bayou Vincent

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/LAltonEagle Lake MHP23

CPRA Model: Ben Thomas Road Pond (Flow Augmentation)Proposed Pond will improve drainage AND WQ in the area AltonEagle Lake MHPIF Pond24Volunteers planted over 500 trees in November 20127.5-Acre Tammany Hills SW Pond( Vegetative Planting)

25Tammany Hills SD(Vegetative Planting)

401 homes benefitting Unsewered SD

26CPRA Model: 7.5-Acre Tammany Hills Sewer Improvements & SW Pond ( Vegetative Planting)

SW/WQ PondSewer improvementsSewerage improvements to Tammany Hills SD (RKm 8.3) removes 215,000 GPDAdding the SW/WQ Pond provides additional DO benefits27

14-Acre Chinchuba SW Pond (Vegetative Planting )

Volunteers planted over 4400 trees in February 2013

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CPRA Model: 14-Acre Chinchuba SW Pond (Vegetative Planting)

Even with sewer and pond improvements will be inadequate to meet the current DO standardArea 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.Sewer improvementsSW/WQ Pond29

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 PondEven 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.30

Parish Financial Commitments to Drainage/WQ ($160.6 Million)

A substantial achievement for any local government31

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

32Demonstrated WQ Improvement: 2012 303(d) List33Questions?

34Sheet1LDEQ SubsegWatershedPermitted DischargersTotal Permitted GPD40802 & 40803Lower Tchefuncte, Ponchitolawa, Tete L'Ours, DeZaire (Dissolved Oxygen)2114,347,32740901Bayou Lacombe (Dissolved Oxygen)61129,64140902Cypress Bayou & Big Branch (Dissolved Oxygen)17282,97940903Bayou Cane (Dissolved Oxygen)4287,50040905 - 40908Bayous Liberty, Vincent, Bonfouca, Paquet (Dissolved Oxygen)1841,223,10740909W-14 Canal (Fecal Coliform)477,093,47140910 Salt Bayou (Fecal Coliform)637,426TOTALS53013,401,451

Brief Summary_TMDL ImpactsTMDLs in St Tammany Parish (Summary of TMDL Recommendations)SubsegmentWatershedTotal Number of Permitted DischargersTotal GPD DischargedDischarge CharacterizationSub segmentWatershedPermitted DischargersTotal GPD Discharged40802 & 40803Lower Tchefuncte River, Ponchitolowa Creek, Bayou Tete L'Ours (Dissolved Oxygen)2114,347,327Permit ClassNumber of Dischargers (by Class)Current GPD (by Class)40802 & 40803Lower Tchefuncte, Ponchitolawa, Tete L'Ours, DeZaire (Dissolved Oxygen)2114,347,327Class I126277,757Class II585,200ClassIV201,405,650Individual [1]602,578,72040901Bayou Lacombe61129,641Permit ClassNumber of Dischargers (by Class)Current GPD (by Class)40901Bayou Lacombe (Dissolved Oxygen)61129,641Class I4043902Class II325250ClassIV228600Individual [1]163188940902Cypress Bayou & Big Branch17282,979Permit ClassNumber of Dischargers (by Class)Current GPD (by Class)40902Cypress Bayou & Big Branch (Dissolved Oxygen)17282,979Class I1111979Class II00ClassIV295000Individual [1]317600040905 - 40908Bayous Liberty, Vincent, Bonfouca, Paquet (Dissolved Oxygen)1841,223,107Permit ClassNumber of Dischargers (by Class)Current GPD (by Class)40905 - 40908Bayous Liberty, Vincent, Bonfouca, Paquet (Dissolved Oxygen)1841,223,107Class I87153,897Class II874,575ClassIV12789,600Individual [1]77205,03540909W-14 Canal (Fecal Coliform Bacteria)477,093,471Permit ClassNumber of Dischargers (by Class)Current GPD (by Class)40909W-14 Canal (Fecal Coliform)477,093,471Class I2819,354Class II426,844ClassIV3127,553Individual [1]126,919,72040910 Salt Bayou (Fecal Coliform Bacteria)637,426Permit ClassNumber of Dischargers (by Class)Current GPD (by Class)40910 Salt Bayou (Fecal Coliform)637,426Class I34,150Class II00.0ClassIV128,256Individual [1]25,020TOTALS52613,113,951TOTALS52613,113,951Permit ClassNumber Dischargers Impacted (by Class)Total GPD Impacted (by Class)Cost Per Business to Upgrade [1] (by Class)Class I295511,039$17,323Class II20211,869$105,935ClassIV402,474,659$618,665Individual1709,916,384$583,317Totals52513,113,951[1]Assume $10/Gal to upgrade

GPDRenewal DateClass I General Sanitary5/25/25/25/25/25/25/25/25/25/25/25/2 AVC ElectricLAU0059005/16/08203015210102159157724Seventh-Day Adventist Church - WWTPLAU0059015/8/081,25030152101021551579272319 Hwy 190 BuildingLAU0059025/16/084030152101021741579282317 Hwy 190 BuildingLAU0059035/16/08603015210102164270802315 Hwy 190 BuildingLAU0059049/10/973203015210102156157930Reflection MirrorLAU0059065/16/083403015210102157934Chill RiteLAU0059102203015210102176114943TBC Ltd - TBC Professional Building5000East of Hwy 190 cluster33COUNTClass GPDPermit TypeGPD per ClassAverage Cost to upgrade per business20Number Class I Dischargers (LAG53xxxx) limits BOD/NH3 30/15-->5/25/25/25/25/25/25/2Number Class I Dischargers (LAG53xxxx) limits BOD/NH3 30/15-->5/25/2Number Class II Dischargers (LAG54xxxx) limits BOD/NH3 30/15-->5/25/2Number Class IV Dischargers (LAG57xxxx)limits BOD/NH3 30/15-->5/2