Dave Goerman Water Quality Bm Ps And Manuafactured Soils

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  • Dave Goerman Water Quality Bm Ps And Manuafactured Soils

    1. 1. Water Quality BMPs and Manufactured Soils Dave Goerman PA DEP Bureau of Watershed Management Division of Waterways, Wetlands and Stormwater Management (717) 772-5971 [email_address]
    2. 2. Agency Perspective <ul><li>Some of us are excited about the potential of organically based media to treat many of the pollutant and runoff volume impacts that result from development activities. </li></ul>
    3. 3. The Role of Manufactured or “Engineered” Soils <ul><li>Beneficial reuse of waste stream(s) </li></ul><ul><li>Cost effective water quality treatment </li></ul><ul><li>Provide predictable, reliable and repeatable media </li></ul><ul><li>Maintain, enhance and restore surface water quality </li></ul>
    4. 4. Facts and Figures <ul><li>Over the past ten years, an average of 52,555 acres of earth disturbance occurs annually. </li></ul><ul><li>The majority of these sites will require water quality BMPs. </li></ul><ul><li>Stormwater water quality requirements have statewide coverage. </li></ul>
    5. 5. Proposed Structural BMPs <ul><li>6.4.2 Infiltration Basin </li></ul><ul><li>6.4.4 Infiltration Trench </li></ul><ul><li>6.4.5 Rain Garden/Bioretention </li></ul><ul><li>6.4.7 Constructed Filter </li></ul><ul><li>6.4.8 Vegetated Swale </li></ul><ul><li>6.4.9 Vegetated Filter Strip </li></ul><ul><li>6.4.10 Infiltration Berm & Retentive Grading </li></ul>
    6. 6. Proposed Structural BMPs con’t <ul><li>6.5.1 Vegetated Roof </li></ul><ul><li>6.6.1 Constructed Wetland </li></ul><ul><li>6.7.1 Riparian Buffer Restoration </li></ul><ul><li>6.7.2 Landscape Restoration </li></ul><ul><li>6.7.3 Soil Amendment and Restoration </li></ul><ul><li>6.7.4 Floodplain Restoration </li></ul>
    7. 7. Infiltration Basin Practices <ul><li>Incorporating Compost Amendments </li></ul><ul><ul><li>Reduces likelihood of sealing and crusting </li></ul></ul><ul><ul><ul><li>By increasing soil moisture during non-event periods </li></ul></ul></ul><ul><ul><ul><li>Promotes healthier vegetation </li></ul></ul></ul><ul><ul><ul><li>Increases infiltration (all soil types) </li></ul></ul></ul>
    8. 8. Infiltration Trenches <ul><li>Replace stone with compost/soil media </li></ul><ul><ul><li>Increased volume capacity </li></ul></ul><ul><ul><ul><li>Up to 80% volume storage (depends upon mix) </li></ul></ul></ul><ul><ul><li>No geotextiles needed </li></ul></ul><ul><ul><li>Promotes better vegetation </li></ul></ul><ul><ul><ul><li>Turf grasses generally not recommended </li></ul></ul></ul><ul><ul><li>Possible weight bearing issues </li></ul></ul><ul><ul><li>No available research found yet </li></ul></ul><ul><ul><ul><li>However, same underlying processes and principals </li></ul></ul></ul><ul><ul><ul><li>studied in other compost based BMPs </li></ul></ul></ul>
    9. 9. Proposed Model Stormwater Ordinance <ul><li>Section 303. Water Quality </li></ul><ul><li>- Water quality provisions are proposed </li></ul><ul><li>- Existing cover conversion to non-equivalent types of pervious cover requires some stormwater volume retention </li></ul>
    10. 10. General Effect of Organic Based Media <ul><li>Metals </li></ul><ul><ul><li>Can Increase Solubility </li></ul></ul><ul><ul><li>Reduces Toxicity of Most Metals </li></ul></ul><ul><li>Hydrocarbons </li></ul><ul><ul><li>Retains & Degrades </li></ul></ul><ul><li>Organics </li></ul><ul><ul><li>Retains & Degrades </li></ul></ul><ul><li>Nutrients </li></ul><ul><ul><li>Increased Runoff Concentrations </li></ul></ul><ul><ul><li>Significantly Lower Mass Concentrations </li></ul></ul><ul><li>Pollutant load and contact time are important factors </li></ul>
    11. 11. Effectiveness of Organic Based Media on Disturbed Soils Technical Note #108 from Watershed Protection Techniques. 1(4): 666-669
    12. 12. Effectiveness of Organic Based Media on Disturbed Soils
    13. 13. What’s Needed? <ul><li>Media specifications </li></ul><ul><li>Adequate supplies </li></ul><ul><li>Quality assurance </li></ul><ul><li>Long term monitoring </li></ul>

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