Presentation on theme: "TxDOT Strategies for Phase II MS4 Stormwater Compliance"— Presentation transcript:
1TxDOT Strategies for Phase II MS4 Stormwater Compliance Dianna Noble, P. E.Environmental Affairs DivisionTexas Department of TransportationSCOE/SCOD MeetingJune 2004
2In Strategy the longest way round is often the shortest way there…. B In Strategy the longest way round is often the shortest way there… B.H. Liddell Hart
3Texas Pollutant Discharge Elimination System (TPDES) 1987 amendments to the Clean Water Act required EPA to permit storm water discharges.Phase I, finalized in 1990 required NPDES storm water permits for industrial activities and large cities.EPA approved the TPDES Program in September, 1998.Phase II became final in December, All MS4’s within urbanized areas with populations less than 100,000 must obtain a TPDES MS4 permit.TPDES Phase II MS4 rules apply to 233 Texas small towns and rural areas, and state highway system roads within urbanized areas.
4Texas Urbanized Areas requiring a Phase II MS4 permit
5Proposed Texas Commission on Environmental Quality (TCEQ) Phase II TPDES MS4 General Permit TCEQ published a draft Phase II MS4 General Permit in September, 2002 to permit storm water discharges from small MS4’s.Permit RequirementsSmall MS4s must implement a Storm Water Management Program (SWMP) to reduce discharge of pollutants to the maximum extent practicable.SWMP must include Six Minimum Control Measures, Best Management Practices and Measurable Goals.MS4 operator must submit an NOI and SWMP, or individual permit application.Permit Coverage is for 5 years.
6Proposed TCEQ Phase II TPDES MS4 General Permit – Court Case The permit has not been finalized. The March 10, 2003 permit deadline was delayed by a Federal Appeals Court case.The Court said EPA must amend the general permitting option for Phase II MS4s to comply with the Clean Water Act regardingReview of NOIs by TCEQOpportunity for public hearing on NOIsPublic availability of NOIs
7TxDOT MS4 Phase II SWMPsEPA and TCEQ recommend that MS4s which will require Phase II permits develop SWMPs now – do not wait for the General Permit.TxDOT is developing and will implement a Phase II SWMP.
8Proposed Texas Phase II MS4 General Permit SWMP will require implementation over 5 years; includes Six Minimum Control Measures (MCMs)Public Education & OutreachPublic Involvement and ParticipationIllicit Discharge Detection and EliminationPollution Prevention & Good HousekeepingConstruction Site Runoff ControlPost-Construction Storm Water ManagementAuthorization for Municipal Construction Activities (Optional Measure)
9TxDOT Phase II MS4 Implementation TCEQ requires SWMP to be implemented over 5 yearsTxDOT Districts may incorporate current Phase I SWMP provisions into Phase II SWMP
10TxDOT StrategiesStormwater Runoff Control and Water Quality Research ProjectsSupport TxDOT Districts with Engineering Consultant Services Contracts for Phase II implementationBuild on TxDOT Storm Water Programs
11Strategies - continued Worked with stakeholder groups and TCEQ to influence TCEQ’s original General Permit.Will work with stakeholders and TCEQ again to implement Court directed requirements.Will work with TCEQ to develop statewide transportation Phase II MS4 General PermitTxDOT MS4 Work Group will continue to develop guidance for six required Phase II MS4 Minimum Control Measures for TxDOT Districts.
12ResearchTexas Transportation Institute, Texas A & M University, Texas Department of TransportationDesign Methods, Selection, and Cost-Effectiveness of Stormwater Quality Structures(Project Number )Cost comparison index to identify the most cost effective stormwater BMP options for meeting stormwater quality requirements.Lifecycle cost in relation to efficiency in removing TSS, the primary index pollutant in storm waterDesign methods for estimating pollutant loads and sizing selected structures.
13Cost per pound of TSS removed from Infiltration Basins ConcretePartial ConcreteEarthen
15ResearchCenter for Transportation Research, The University of Texas at Austin, Texas Department of TransportationProcess Framework for Identifying and Prioritizing Water Quality Improvement for Meeting TMDLs in Texas(Project Number )To anticipate the requirements of the TMDL process and have data at hand to respond if TxDOT is identified as contributing to the impairment.Identified major causes of impairment of water bodies in Texas as bacteria and low dissolved oxygen concentrations.Interactive GIS map of the impaired streams was created in ArcGIS to aid TxDOT in identifying where the impaired segments are in relation to major highways and roads.
17Effectiveness of BMPs in Removing Constituents TSSTKNNitrateTPTotal ZincFecal Colif.Austin Sand FiltersHighMedLowExtended Detention BasinWet BasinInfiltration BasinVegetated SwalesBuffer StripsVaried
18Effectiveness of BMPs in Removing Constituents in Highway Runoff Percent RemovalTSSTZTPUnlined Extended Detention BasinWet BasinVegetated Buffer StripTNAustin Sand FilterSwale
19Storm Water Contracts5 Contracts awarded for environmental engineering consultant services.Total award amount $2,500,000Assist TxDOT Districts with MS4 and Construction Storm Water Permit requirements.Train TxDOT Districts’ staff on TPDES CGP and MS4 storm water permits.Perform various statewide Phase I and Phase II MS4 program components.Perform MS4 compliance tracking.
20Storm Water Contracts (continued) Field inspections of TxDOT construction sites to determine compliance with TPDES Construction General permit requirements.Train TxDOT Districts’ staff on selection, design, installation and maintenance of temporary and permanent erosion and sediment control measures and other BMPs.
21Use of Storm Water Contracts TxDOT Dallas District$480,000 for total Phase II ProgramTxDOT Ft. Worth District$100,000 for Phase II Outfall Mapping and ScreeningEnvironmental Affairs DivisionStormwater Field Inspector’s Guide
22TxDOT Strategies for Phase II MS4 Stormwater Compliance SummaryTxDOT Strategies for Phase II MS4 Stormwater ComplianceContinue dialog with TCEQTxDOT MS4 Work Group to continue developing guidance for TxDOT DistrictsUse Environmental Engineering Consultants contracts