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Where’s My Material?

Where’s My Material? Appropriate Planning for Cap and Habitat Restoration Material Quantities. Presented by Paul LaRosa, P.E., John Verduin, P.E., and Ram Mohan, P.E., Ph.D. October 25, 2012. Outline. Importance of Estimating Material Volumes

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Where’s My Material?

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  1. Where’s My Material? Appropriate Planning for Cap and Habitat Restoration Material Quantities Presented by Paul LaRosa, P.E., John Verduin, P.E., and Ram Mohan, P.E., Ph.D. October 25, 2012

  2. Outline • Importance of Estimating Material Volumes • Review of Factors Affecting Material Volumes • Case Study – St. Lawrence River • Summary of Recommendations

  3. Importance of Estimating Material Volumes • Aids in development of engineer’s accurate estimates • Provides tool to evaluate bids and minimize potential for cost overruns • Allows for appropriate planning for post-construction elevations • e.g., accounting for over-placement, “run-out,” etc.

  4. Factors Affecting Material Volumes • Project and contractual requirements • Materials handling and placement • Material type and gradation • Site-specific factors

  5. Project and Contractual Requirements • Over-placement allowances Armor Layer (Gravel) Over-placement allowance 6” Minimum 6” Minimum 12” Minimum,plus over-placement Isolation Layer (Sand) Over-placement allowance

  6. Project and Contractual Requirements • Cap side slopes (i.e., “run-out”) Run-out Area to be capped Sand cap material SEDIMENT TO BE CAPPED Gravel cap armor material Habitat layer

  7. Materials Handling and Placement • Management of stockpile • Placement beyond the required limits or grades based on equipment configuration • Uniformity of placement

  8. Materials Handling and Placement Source: http://www.lakecleanup.com Mechanical Bucket Hydraulic Slurry Source: Putzmeister.com Source: Terra et Aqua (No.122/March 2011 Conveyor Belt Broadcast Spreader

  9. Materials Handling and Placement • Placement beyond the required limits or grades based on equipment configuration

  10. Materials Handling and Placement • Uniformity of Placement Cap Material Sediments being capped

  11. Material Type and Gradation • Relative density of materials in place compared to stockpile • Loss to water column via suspension and transport • Mixing with underlying sediment Source: www.dixonmarineservices.com

  12. Site-Specific Factors • Water depth • Currents and tides • Bottom slopeand “roughness” Habitat Layer – Filling Interstitial Space Sand Native Material

  13. Case Study – St. Lawrence River

  14. Summary of Recommendations Typical Excess Material Factors Based on Anchor QEA Experience * Water column loss factor based on fines content (% passing No. 200 sieve) of cap material

  15. Summary of RecommendationsWays to Control Excess Materials • Pilot studies • Operational modifications • Quality assurance/quality control (QA/QC) • Regular tracking of material volume • Adaptive management

  16. Questions? Paul LaRosa, P.E. Anchor QEA, LLC plarosa@anchorqea.com Source: www.thegrasseriver.com

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