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Cost Effective Rodent Burrow Mitigation in Project Levees Using Grouting

Cost Effective Rodent Burrow Mitigation in Project Levees Using Grouting. California Department of Water Resources Levees Maintenance & Inspection Program November 2011. Genesis of Grouting Demonstration. DWR Maintenance Yards Programs (2000) Vegetation-on Levees (CLVRP) Research

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Cost Effective Rodent Burrow Mitigation in Project Levees Using Grouting

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  1. Cost Effective Rodent Burrow Mitigation in Project Levees Using Grouting California Department of Water Resources Levees Maintenance & Inspection Program November 2011

  2. Genesis of Grouting Demonstration • DWR Maintenance Yards Programs (2000) • Vegetation-on Levees (CLVRP) Research • Methods Research by Allen Romero (DWR-retired)

  3. Demonstration Site Overview • RD 1500 – Robbins, CA • Sutter County • 16 miles NE of Woodland • Agricultural Levees • Borders Sacramento River • Unit 1 Levee • Sandy Soils • Grass Cover Only • Adjoins Active Corn Field • Squirrel Infestation (Pronounced)

  4. Typical RD 1500 Burrow Openings

  5. Goals of Grouting Study • Levee Risk Factor • Burrow Architecture • Engineering Quantification (LiDAR) • Seepage & Stability Effects • Grouting Methodology • Effectiveness of Cement-Bentonite • Low-Cost Fabricated Unit • Small Repairs vs. Large Repairs

  6. Fabricated Low-Cost Unit

  7. Grouting Test Site with Flagging

  8. Hand Mixing Cement-Bentonite

  9. Grouting Activities

  10. Grouting Logistics • Resources • 2 to 3 man crew • Mixer/Pump/Hoses/PVC • Cement-Bentonite, Garden Hoe • Water Tank • Burlap Bags, Stakes, Sledge Hammer

  11. Larger Repairs Require Batch Source

  12. Grouting Exposed (upper complex)

  13. Grouting Exposed (lower complex)

  14. Summary of Grouting Activities • 14 Significant Holes Grouted in 65-feet Reach • Average take approximately 1.5 cubic feet/hole • Largest take took over 3 cubic feet & 13 minutes • Urethane grout exposed air bubbles in C-B grout • Urethane grout showed voids still existed where levee slopes tractor rolled or dragged

  15. Cost of Fabricated Mixer/Pump* • Blah-Blah-Blah • Blah-Blah-Blah • Blah-Blah-Blah *Cost based upon 2011 U.S. dollar *Adjust yearly for inflation

  16. Cost of Cement-Bentonite Grout* • Blah-Blah-Blah • Blah-Blah-Blah • Blah-Blah-Blah *Cost based upon 2011 U.S. dollar *Adjust yearly for inflation

  17. Final Observations & Thoughts • Cement-Bentonite Grouting is Cost Effective • Resources to fabricate a mixer/pump readily available and relatively inexpensive • Labor resources no greater than other LMA activities • Grouting most effective when performed annually in conjunction with actively maintained rodent bait stations

  18. Questions?

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