UMD Storm Water Program Construction Requirements. Greg Archer, MBA Environmental Compliance Specialist

Transcription

1 UMD Storm Water Program Construction Requirements Greg Archer, MBA Environmental Compliance Specialist

2 Phase 2 Regulatory Overview Dec EPA issues Phase 2 Federal Register Municipalities (MS4) from 10,000 to 100,000 pop. Construction Sites >1 Acre Disturbance June 2002 MPCA issues Draft MS4 General Permit February 2002 MPCA Defines Non-Traditional MS4s January 2003 MPCA issues Draft Construction Permit March 10, 2003 Phase 2 Rule becomes effective August 1, 2003 MPCA Phase 2 Construction Permit becomes effective Note Two separate regulatory programs

3 Six MS4 EPA Minimum Program Areas (Storm Water Management Plan) 1) Public Education and Outreach 2) Public Involvement and Participation 3) Illicit Discharge and Detection 4) Construction Site Erosion and Sediment Control 5) Post Construction Storm Water Management 6) Pollution Prevention/Good Housekeeping Note Reduce impacts on receiving waters to the maximum extent practicable

4 Pre-design Considerations Evaluate Regional Factors Groundwater, Temperatures, Rainfall, Wind, Snowmelt Check Protected Water Bodies and Wetlands Trout Streams, Special Waters, TDML (Impaired Waters) Determine Watershed Factors Size, Topography, Other Uses Develop Topo Map (Minimum 2 Contours) Determine Areas to Be Protected Wetlands Historical Features Adjacent Properties Quantify Erosion Rates and Runoff Project Size Percent Impervious Surfaces Soil Loss Rates Unique Vegetation Existing Structural Storm Water Controls Runoff Rates (2 yr, 10yr, 100yr, Snowmelt) Velocities

5 Construction Site - Goals and Objectives Pollution Prevention Measures 1. Erosion Control Minimize Land Disturbance Reduce Short and Long Term Erosion Quickly Stabilize Channels and Slopes 2. Sediment Control No Sediment Leaves the Site Inspections and Maintenance 3. Litter and Debris Control 4. Material Delivery and Storage Issues 5. Equipment Maintenance 6. Final Stabilization When you cut Mother Earth, she bleeds - Retain the existing vegetation whenever feasible!

6 Construction Site BMP Options Silt Fences Rock Check Dams Channel Protection Temporary Ponding Construction Phasing Inlet Protection Temporary Cover Dewatering Plan Secure Protected Areas Protect Spoil and Stockpile Areas For Additional BMP s See: Stormwater Practices for Cold Climates - Metropolitan Council's Urban Small Sites Best Management Practice Manual - Minnesota Pollution Control Agency's Protecting Water Quality in Urban Areas - Sediment control is only a backup if the erosion control fails.

7 Construction Sites - University Plan UMD U Construction Standards Status Complete Construction Standards 02 Train U ORs Pending Finalize construction site checklist Formalize site inspection responsibilities Include requirements and enforcement actions in construction documents Develop procedure for handling reports of noncompliance

8 U Construction Standards 02 - General Information The A/E shall incorporate Minnesota Department of Transportation,City of Minneapolis, City of Duluth and Ramsey County Erosion and Sediment Control requirements and guidance into the construction specifications as applicable. At a minimum, the A/E shall identify temporary and permanent erosion and sediment control measures that are site specific Temporary controls include, but are not limited to, silt fences, storm inlet protection, entry/exit stabilization and site stabilization procedures for any exposed soil.

9 Implementation and Maintenance Document Weekly/Rain Event Inspections Review Inspection Reports as Part of Weekly Project Meetings Update SWPPP as appropriate Keep Records (3 years) Flexibility is key - Be ready to modify the plan as needed throughout the construction phases!

10 How Does Urbanization Impact Water Bodies? Pond Elevation 8/12-8/13,2001 Water Level (m) Inlet 0.2 Outlet Fractional Day of Year DOY 224 = Aug 12 UMD Oregon Creek Normal Flow Stream Bank Scour Rain Event City - Erosion Control

11 Permanent/Post Goals and Objectives Meet Requirements (Federal, State, Local, University) Wetlands Trout Streams / Special Value Waters MPCA Construction / Dewatering Permits University and City MS4 Requirements No Net Gain Reduce to the Maximum Extent Practicable Volume and Velocity Temperature Turbidity Chemicals Minimize Long Term O/M Develop Maintenance Plan Improve Aesthetics with Native Landscaping Enhance Teaching and Research Opportunities

12 Permanent/Post Construction BMPs Minimize Impervious Surfaces Detention/Retention Facilities Sized for Expected Volumes Design of Permanent Structures Maintenance Plan Access for Maintenance/Sampling Permanent Vegetation Suitable for Slopes, Use, and Soil Types Soil Testing / Amendments / Fertilizer / Aeration Grit/Oil Chambers/Stormceptors Sized for Expected Volumes Maintenance Plan

13 University Plan - Post Construction UMD 501 Post Construction Storm Water Management* Status Developed U Standards Train U ORs Future Developing long term O/M Revise U Construction Standards with watershed specific requirements Train ORs annually

14 U Post Construction Standards Along with temporary controls, Environmental Protection Agency (EPA) Phase 2 Storm Water Rules require that all new development and redevelopment include permanent control measures to reduce storm water impact on receiving water to the maximum extent practicable (MEP) Permanent controls are based on a goal of no net increase in storm water volume, rate or pollutant loads from new construction and redevelopment that add impervious surfaces. Permanent controls include, but are not limited to, vegetable swales, rain gardens, sediment ponds, retention areas, pervious surfaces and other alternatives to direct plumbing [ a separate MPCA Permit for any site or common project disturbing greater than 1 acre ] Sustainable Sites: This includes development in environmentally appropriate areas, reduced site disturbance, proper stormwater management and sustainable landscape design.

15 Common Plan MPCA Permit Definition - "a contiguous area where multiple separate and distinct land disturbing activities may be taking place at different times, on different schedules, but under one proposed plan. One plan is broadly defined to include design, permit application, advertisement or physical demarcation indicating that land-disturbing activities may occur." Minnesota Environmental Review Rules further define common plan as either: 1) phased action will have environmental effects on the same geographic area AND are substantially certain to be undertaken sequentially over a limited period of time. 2) connected actions one project would directly induce the other, one project is a pre-requisite for the other, OR neither project is justified by itself.

16 MPCA Construction Permit Terms Construction Activity - >5 Acres Common Plan for Development Small Construction Activity between 1 and 5 Acres Appendix A Special Waters Trout Waters Wetlands Historic Places Best Management Practices (BMPs) Location and type of all BMPs Site map with: Existing grade and final grade Flow of all pre and post storm water drainage areas Impervious surface areas and soil types Location of areas not to be disturbed All surface waters and wetlands within ½ mile

17 MPCA Permit Temporary Erosion and Sediment Controls Standard Plates and/or specifications for each: Silt Fences Entry/Exit Stabilization and Street Sweeping Catch Basin Protection Site Stabilization On site delineation of staging areas and/or areas not to be disturbed Inspections every 7 days and within 24 hours of ½ rain event Date/time Name Findings/recommendations Corrective actions Date/amount of rainfall over 0.5 inches in 24 hours Documentation of changes to SWPPP Training Temp. Sediment Basin for sites impacting >10 acres Narrative describing timing for all controls Dewatering Controls Temp sediment basin or alternatives

18 MPCA Permit Pollution Prevention Solid Waste Management Procedures Litter Control Hazardous Materials secondary containment and protection from vandalism Truck Washing only in designated areas concrete truck washout. Permanent Storm Water Controls All storm water must be discharged in a manner that does not cause nuisance conditions, erosion in receiving channels, or on down slope properties, or inundations in wetlands causing a significant adverse impact. > 1 acre impervious control ½ inch rain event 5.66 CFS per acre of surface area of the pond 80% TSS Appendix A Special Waters (trout streams, historic places ) Wet sedimentation Infiltration/filtration Regional Pond Combination of Practices Alternative Methods includes monitoring over 2 years Identify O/M responsibilities for system

19 MPCA Permit Application Requirements At least 7 days prior to start of construction Must have complete SWPPP prior to submitting application. Signed by Owner and Operator (Contractor) and re-apply if there is a change of contractors for different phases Submit notice of termination once site has completed final stabilization Record Keeping SWPP, Inspections, Training, and all changes Keep for three years after notice of termination All inspections and maintenance All required calculations for temp and perm storm water management systems

20 Thank You!