Presentation on theme: "Mike Isensee, CPESC Watershed Specialist Describe your project (in a nutshell) What was innovative about this project? (ie. process,"— Presentation transcript:
Mike Isensee, CPESC Watershed Specialist email@example.com Describe your project (in a nutshell) What was innovative about this project? (ie. process, techniques, materials, application, where it was used, etc.) What research did you use in developing this project? Where would & wouldn’t this practice/project work? (ie. good for an ultra-urban area; wouldn’t work well in a rural community) What are 1-3 key pieces of advice you would give someone else interested in using this practice? New Bioretention
MPCA- Mike Trojan, Mike Findorff Kestrel Design Group- Peter McDonough and Nathalie Shanstrom Dr. Bill Hunt and Ryan Winston, NC State Dr. John Gulliver and Andy Erickson, U of M Dwayne Stenlund Large Workgroup-
Media Mixes for Bioretention Cells Mix A Sand- ASTM C-33 (55-65%) Top Soil- Sandy Loam >5% clay content (10-20%) Compost- MnDOT Grade 2 (25-35%) Mix B Sand- ASTM C-33 (50-75%) Compost- MnDOT Grade 2 (30-50%)
Bioretention Media MIX A 1. Soluble metals and petroleum hydrocarbon sorption 2. Robust biological community 1. Slower hydraulic conductivity (captures less stormwater) 2. Difficult to find “sandy loam or loamy sand” 3. Can not field test less than 5% clay content 4. Probably leaching soluble P. ProsCon
Bioretention Media MIX B 1. Washed c-33 construction sand has rapid hydraulic conductivity (captures more stormwater) 2.Soluble metals and petroleum hydrocarbon sorption 3. Plants exhibit robust growth 4. Media can be quality controlled without lab analysis 5. Mix components are readily available at most yards ProsCon
Sample and Field Control the Quality of Materials BEFORE Delivery Which Sand is Washed? Is This Really Washed Sand and Compost ?
Processing of Pollutant in Bioretention Cells Compost P P P P P P P P P P P P P P P Bannerman 2013
Options Considered in the MN Stormwater Manual 1. Construct bioretention without an underdrain 2.Ensure Media Mixture to a P content between 12- 30 mg/kg (and supports vegetation). 3. Incorporate a soil amendment to facilitate absorption of P (and does not kill vegetatoin)
Media Mixes for Bioretention Cells Mix A Sand- ASTM C-33 (55-65%) Top Soil- Sandy Loam >5% clay content (10-20%) Organic Matter- MnDOT Grade 2 (25-35%) Monitored performance: Unknown, but if P Index is Lower than 30 mg/kg TP Removal Ranges from 22%-68%
Media Mixes for Bioretention Cells Mix B Sand- Washed ASTM C-33 (50-75%) (75-85%) Organic Matter- MnDOT Grade 2 (30-50%) (15-30%) Monitored performance: Exports soluble phosphorous. May not export P if the P Index is Lower than 30 mg/kg.
Media Mixes for Bioretention Cells Mix C (NC State Water Quality Blend) Sand- USDA Textural Classification (85-88%) Fines- (8-12%)* Organic Matter- MnDOT Grade 2 Compost (3-5%) * In areas where phosphorus is the target pollutant, a lower concentration of fines (8 percent) should be used. Monitored performance: If P Index is Lower than 30 mg/kg TP Removal Ranges from 22%-68%
Media Mixes for Bioretention Cells Mix D (Bannerman Water Quality Blend) Coarse Sand- (Min. 50-65%) Topsoil-(Up to 25-35%) Organic Matter- MnDOT Grade 2 Compost (10-15%) * In areas where phosphorus is the target pollutant, a lower concentration of fines (8 percent) should be used. Monitored performance: If P Index is Lower than 30 mg/kg TP Removal Ranges from 22%-68%
Melich III, Bray Test and Olsen (if soils are alkaline/basic) are acceptable measures of soil Phosphorous content. 53% TP reduction Credit for Media with a Phosphorous content 30 mg/kg or less 0% TP reduction if Phosphorous content is higher than 30 mg/kg or unknown
BIORETENTION MEDIA SPECIFICATIONS MediaSpecification% By Volume Coarse Washed Sand ASTM C-33 or MnDot 3126 Fine Filter Aggregate 55-65% Fines 10-20% Leaf CompostMnDOT Certified Type 225% Notes : PH 6.0-8.5 Phosphorous 12-30 mg/kg Less Than 5% Clay Content Contractor/vendor must test media prior to installation. Contact WCD to obtain testing forms. Testing takes approximately 7-10 days. Test results must be provided to WCD at least 24 hours prior to construction. Media samples will be taken during construction. Media not conforming to the approved mixture will be removed and replaced at the contractors expense.
Bioretention media mix test results must be submitted to WCD at least 24 hours prior to material delivery. Test results must include grain size analysis (sand, silt, clay), pH, organic content, Bray phosphorus test.
Analysis Cost ($) Standard Turnaroun d Time Sample Amount Needed 9045 pH Soil214 Hours50 grams ASTM D2974 Organic Matter422 Days50 grams Phosphorous (Bray)752 Days60 grams 365.1 Total Phosphorous322 Days20 grams CEC933 Days200 grams Grain Size1775 Days200 grams
Agenda Meet on Location Review Installation Notes Review Installation Timing Verify Media Testing Verify Materials and Sources Collect Construction Crew Cell Phone Numbers
Curt Coudron, CPESC, Senior Resource Conservationist Jim Davidson, CPSWQ, CPESC, Urban Conservationist Mike Isensee, CPESC Watershed Specialist firstname.lastname@example.org New Bioretention Andy Schilling, Watershed Restoration Specialist Bryan Pynn, Senior Water Restoration Technician Tara Kline, Natural Resource Specialist Peter McDonough Nathalie Shanstrom Mike Isensee, CPESC Watershed Specialist email@example.com
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