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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 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 • Methods Research by Allen Romero (DWR-retired)
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)
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
Grouting Logistics • Resources • 2 to 3 man crew • Mixer/Pump/Hoses/PVC • Cement-Bentonite, Garden Hoe • Water Tank • Burlap Bags, Stakes, Sledge Hammer
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
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
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
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