Leonard Engineering

Logan CSO Basin

  • Project Owner: MSD
  • Process Engineer: HDR Engineering, Inc.
  • Completion Date: 2017
  • Location: Louisville, KY
  • Cost: $47.9 Million

The 17 million gallon Logan CSO Basin is located at the intersection of East Breckinridge Street and Logan Street in downtown Louisville, Kentucky. The facility is primarily constructed of reinforced concrete and measures to be approximately 200 feet by 400 feet in footprint. The basin itself is hidden underground with approximately 2 to 3 feet of soil overburden covering the roof. The wet well, which is located beneath the control building, is considered to be the deepest portion of the basin that extends almost 60 feet below ground level. To resist buoyant forces due to high groundwater and flooding events, the basin is anchored to the underlying bedrock with a grid of over 1,000 pre-stressed rock anchors. Above grade structures include a main control building with a covered monorail crane area, a flushing gate control building, and an access ramp enclosure. The green space above the basin is planned to be a community park for the Smoketown neighborhood.

For this project, Leonard Engineering was selected to provide Special Inspection services during construction. Special inspections and material testing were required for this project per the provisions in Chapter 17 of the Kentucky Building Code. Leonard Engineering worked closely with the HDR Construction Inspector, as well as the Material Testing Agency, to verify that construction of the basin was executed in accordance with the construction documents. Some of Leonard Engineering’s tasks included: Review of rock anchor installation methods, rebar inspections, review of concrete testing reports, verification of member sizes and dimensions, waterstop inspections, aluminum and steel framing inspections, etc. As part of Leonard Engineering’s responsibilities, a discrepancy log was also maintained to track pertinent information about each discrepancy identified during construction. The log specifically tracks each discrepancy identified, as well as when and how it was corrected. This discrepancy log will be used in the Final Report of Special Inspections to be submitted at the end of the project.

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