Local Conditions-NE Minnesota
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1 Local Conditions-NE Minnesota Identifying Regional Stormwater Challenges Selecting BMPs for our area Experience & observations from MNDOT & MPCA BMPs that work / don t work in NE Minnesota Local Conditions-NE Minnesota Regional Construction Stormwater Challenges Special Waters Clayey soils Poor quality topsoil Steep slopes Shallow depth to bedrock
2 Local Conditions-NE Minnesota Special Waters Lake Superior Trout Streams Clayey Soils Very common throughout region: Duluth, North Shore, North-central MN Local Conditions-NE Minnesota Poor Quality Topsoil In general, the forested region of MN Particularly the Canadian Shield terrain Steep Slopes Common throughout region: Duluth, North Shore Shallow Depth to Bedrock Canadian Shield
3 Local Conditions-NE Minnesota Shaded areas bedrock at surface or < 15 m (50 ) BGS Shallow depth to bedrock Poor quality topsoil Steep slopes along North Shore Special Waters Reproduced from Geology of Minnesota, Ojakangas, Matsch 1982 & Minnesota Geological Survey Definitions Erosion Control Preventing (or minimizing) the dislodgment of soil particles Sediment Control Controlling the movement of soil particles dislodged by failed erosion control practices
4 Definitions Stabilized Mulch, ECBs, sod, rip rap, aggregate surfacing, pavement or other materials that prevent erosion Surface Water Streams, rivers, lakes, ponds, wetlands, ditches, storm sewer systems (including curb & gutter) BMPs for Northeast Minnesota EROSION CONTROL Up-gradient runoff diversion Temporary slope drains Rapid Stabilization Methods Seed w/ oats (Spring, Summer) Seed w/ winter wheat (Fall) Straw, or ECBs Temporary covering w/ geotextile, tarps, poly sheeting, etc.
5 MnDOT Rapid Stabilization Methods Method 1 Type 1 Mulch, Disc Anchor Method 2 Type 1 Mulch & tack w/hss Method 3 Seed, Fert., Type 6 HSS Method 4 Seed, Fert., & cat. 3 ECBs Method 5 Geotextile & class II rip rap BMPs for Northeast Minnesota SEDIMENT CONTROL BMPs Phased construction Construct sensitive areas first Final grade & stabilize perimeter areas early Disturb only what is needed for short-term construction activities
6 BMPs for Northeast Minnesota SEDIMENT CONTROL BMPs (cont) Perimeter Sediment Control (Overland Sheet Flow) Silt Fence Machine Sliced monofilament fabric MNDOT Heavy Duty Preassembled Biorolls / Compost tubes Topsoil berms BMPs for Northeast Minnesota SEDIMENT CONTROL BMPs (cont) Stormwater Conveyance Channels Riffle & Pool effect Rock ditch checks/ Stone weepers/ gabions Boirolls Sod lined swales Rip rap Hay bales
7 BMPs for Northeast Minnesota SEDIMENT CONTROL BMPs (cont) Inlet Protection Inlet Weir Pop-up retractable riser (Wimco) type Dandy bag type Rock snake, rock log (Sac Bag type) Ponding Sediment settling Perf. Riser / monofilament geotextile /pea gravel Chitosan treatment BMPs for Northeast Minnesota SEDIMENT CONTROL BMPs (cont) Dewatering (pumping) Discharge to: Flat surface energy diffuser (plate, plywood, etc.) Natural basin Vegetated area Sanitary sewer (with approval) Longer discharge hose!!
8 BMPs for Northeast Minnesota Poor Quality Topsoil Salvage & re-use existing topsoil Import from adjacent projects Amend topsoil with: Organic materials (black dirt, manure, etc.) Wood chips from land clearing Commercial fertilizer compost BMPs for Northeast Minnesota Steep Slopes Flow diversion Slope drains Riffle & Pool effect Terracing, benching Cat tracking (aka horizontal slope grading) Rip Rap (well defined channel, geotextile) Drop structure
9 BMPs for Northeast Minnesota Shallow Depth to Bedrock Riffle & Pool effect Utilize rock checks to slow runoff Commonly associated with significant elevation differences MPCA Observations Erosion control is far more effective than sediment control Proper installation of ECBs is more important than ECB selection Don t expect miracles from silt fence Silt fence not trenched in = no silt fence
10 MPCA Observations Every construction project should include: Knowledgeable person responsible for ESC work Project SWPPP (on NPDES permitted projects) Landscape rake & shovel Hand seeder, seed appropriate for the application, commercial fertilizer Straw mulch and/or ECB s Minimum 200 of discharge hose for dewaterng MPCA Observations The root cause of nearly all ESC problem sites is a poor (or non-existent) erosion control effort. A great SWPPP is worthless if not followed in the field. Communication breakdown during construction phase Owner/Consultant should identify exactly what ESC work is required Make all ESC work pay items
11 MPCA Observations Complying with NPDES permit requirements takes: Knowledge Sense of Planning Resources Attitude MPCA Observations Erosion Control is far more effective than Sediment Control Sediment Control Think riffle & pool affect Sheet flow and concentrated flow runoff Micro and macro scale
12 MnDOT s experience Todd Campbell, P.E. District Hydraulics Engineer MnDOT District 1 Wood chip mulch & rock checks
13 Rock gutter check Rock Sock flow diversion
14 Divert flow around erosive soils Temporary sediment basin
15 Temporary Stabilization Wood Chip Entrance
16 Fortified Rock Ditch Check Bioroll on Ledge Rock
17 ECB installation Bonded Fiber Matrix
18 Ditch check types Machine Sliced Mono Silt Fence
19 Vegetated Swale / Rock Checks Floatation silt curtain low flow stream
20 Properly stabilized slope Compost log perimeter sediment control
21 Combination of correct BMPs Protect trout streams!
22 Stabilizing a difficult site Questions?
23 BMPs for Northeast Minnesota Riffle & Pool Affect Riffle & Pool Effect Sheet flow, micro scale (Sheet Flow, Micro scale) Typical grading practice Dozer travels parallel to contour Mini-rills develop from dozer pad imprints
24 Common result of grading on the contour Sheet flow transforming to rill erosion Rock Check Sump Stabilized Ditch Stabilized Grading
25 Failed Erosion & Sediment Control Failed Erosion & Sediment Control
26 Failed Erosion & Sediment Control Failed Erosion & Sediment Control
27 Failed Erosion & Sediment Control Failed Erosion & Sediment Control
28 Construction Practices to Avoid Successful Erosion Control Practices
29 Successful Sediment Control Practices Successful Sediment Control Practices Excavate with teeth of bucket traveling parallel to contour Riffle & Pool Loosened, roughened subgrade
30 Successful Sediment Control Practices Successful Sediment Control Practices
31 Successful Sediment Control Practices Successful Sediment Control Practices
32 Successful Dewatering Practices Successful Dewatering Practices
33 Successful Dewatering Practices Successful Construction Practices Perimeter Control Erosion Protection Sand Bag Diversion Berm Pump, Long Discharge Hose
34 Successful Dewatering Practices Successful Perimeter Sediment Control Silt Fence properly installed
35 Successful Perimeter Sediment Control Straw Wattle / Bioroll Successful Perimeter Sediment Control
36 Sequencing Construction Establish Final Grade Early at Sensitive & Perimeter Areas Sequencing Construction Timely Stabilization w/ Appropriate BMPs
37 Sequencing Construction Relax & Watch Your Risks Diminish Successful Construction Practices Vegetated Strip Between Disturbed areas and Silt Fence
38 Successful Perimeter Sediment Control Water Quality Benefits Erosion control Sediment removal Nutrient & pollutant removal Flow retention Runoff cooling
39 Local Support for NPDES Permit NE Minnesota MPCA internet water/stormwater-c.html General information NPDES Permit requirements Permit forms Special waters search
40 Local Support for NPDES Permit NE Minnesota water/stormwater-c.html (cont) Fact Sheets & Guidance Tools Training Opportunities MPCA staff contacts Local Support for NPDES Permit NE Minnesota Permit and Program Forms permit application Permit Transfer/Modification Subdivision Registration Notice of Termination Inspection checklist
41 Local Support for NPDES Permit NE Minnesota Special Waters Special Waters list Special Waters Search Tool Fact Sheets and Guidance Tools Overview of NPDES Permit E & S Control for New Homeowners Stormwater Compliance Tool Kit for Small Construction Operators Construction SWPPP Template Local Support for NPDES Permit NE Minnesota Additional Training Opportunities MECA Annual Conference E & S control lab at Rice Lake, WI MNDOT/ U of MN Inspector/Installer Site Manager Design Resource Professionals Alliance January 19-21, Minneapolis, MN
42 Local Support for NPDES Permit NE Minnesota MPCA Staff Contacts NE Minnesota (Aitkin, Carlton, Itasca, Koochiching, St. Louis, Lake, Cook Counties) Jim Dexter MPCA Northeast Regional Office 525 S. Lake Avenue, Suite 400 Duluth, MN
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