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Earth Systems Pacific

A merican S ociety of C ivil E ngineers San Luis Obispo February 28, 2013 Stormwater Technical Training: Central Coast Post-Construction Stormwater Management Requirements Robert Down, PE, MASCE rdown@earthsys.com. Earth Systems Pacific.

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Earth Systems Pacific

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  1. American Society of Civil EngineersSan Luis ObispoFebruary 28, 2013Stormwater Technical Training: Central Coast Post-ConstructionStormwater Management RequirementsRobert Down, PE, MASCErdown@earthsys.com Earth Systems Pacific

  2. Initial Site Assessment (Overall) When: Early (and often)What: Seeps/Springs Rock Outcrops Drainage Courses Infiltration Potential Geotechnical Hazards Who: Maps Local Professionals

  3. Geotechnical Hazards Landslides Collapsible Soils Expansive Soils Liquefaction Potential Moisture/Water IntrusionCan Lead to Technical Infeasibility

  4. Technical Infeasibility “Sites where Soils Types Significantly Limit Infiltration”

  5. Site Assessment (Specific) Preliminary Planned Control Measures Planned Location/Depth Importance of Facility Planned Infiltration (Partial or Full)

  6. Site Assessment - Testing Soil Borings Subsurface Profile Groundwater Bedrock Permeable Layers

  7. Site Assessment - Infiltration Testing Regional Requirements Local Recommendations Infiltration Testing Shallow -Underdrain Shallow - Infiltration Deep - Overflow Deep - Critical

  8. Interpretation of Test Data Correction/Reduction FactorsWashington State Department of Ecology 2005

  9. Interpretation of Test Data Correction/Reduction FactorsWashington State Department of Ecology 2012

  10. Interpretation of Test Data Correction/Reduction FactorsSoutheast Michigan Council of Governments 2008Reduction Factor (Rf) = ((2d1 - Δd)/(DIA)) + 1City of Los Angeles 2012 Factor of Safety of 3 if Infiltration Tests Performed Factor of Safety of 6 if Borings Only

  11. Design and Construction Remember This is not Construction

  12. Questions ? Earth Systems Pacific

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