City Council August 7, 2012 Bank Stabilization

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City Council August 7, 2012 Bank Stabilization

  1. 1. City CouncilAugust 7, 2012
  2. 2. Concho River and Trails Improvement Project • Construction limits of bank stabilization
  3. 3. Concho River and Trails Improvement Project • Proposed additional bank stabilization work • Approximately 3100lf of boulder bank stabilization • 2400lf on north side, 720lf on south side
  4. 4. Riverbank Erosion
  5. 5. Riverbank Erosion
  6. 6. Riverbank Erosion
  7. 7. Riverbank Erosion
  8. 8. Erosion and Sedimentation• Concho River is main receiving stream for majority of City’s stormwater runoff• Stormwater runoff increases river flows which causes undercutting of banks, sloughing and erosion• Bank erosion contributes significantly to Total Suspended Solids (TSS) in water (cloudy or “turbid” appearance)• Decreased water quality, degradation of aquatic habitat and increased flooding
  9. 9. Proposed Change Order• Total Change Order Request: $687,460.06• Total additional construction time: 105 days• Funding Sources • $100,000 – Half cent sales tax bond issue dollars for design work for the renovation of the 29th Street Complex • $587,460.06 – City of San Angelo stormwater quality improvements project dollars

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