RFB No. 2023-0354-B for Big Lake Weir and Overbank Improvements, Project No. PKR-D-7415, for the Parks and Recreation Department to Stoic Civil Construction, Inc. in the amount of $570,675; and authorizing the City Manager to execute all necessary documents. Approved

The Big Lake Weir and Overbank Improvements project addresses issues identified during the City's annual dam inspections.  The work includes replacing and expanding the existing gabion mattress, repairing slope failure and making minor repairs to the weir structure.  These repairs will extend the life of the dam and address adjacent slope subsidence.  Big Lake Park is located at 3800 Rainier Road.

Big Lake is an iconic feature in the City's north-south hike and bike trail thoroughfare, Chisholm Trail.  Big Lake was created by an impoundment on Spring Creek by an in-line concrete weir.  The weir has a maximum height of nine feet, and the pond has a maximum storage capacity of 31 acre-feet.  The existing weir was built in 1983, and the structure has undergone minimal maintenance and repairs since the installation.  Gabion mattresses were installed in 1996 to provide erosion control on the overbank adjacent to the weir.

The Texas Commission on Environmental Quality regulates dams in the State of Texas and requires that maintenance and safety concerns identified during inspections be addressed in a timely manner.  It is estimated that making these repairs may extend the life of the structure up to 20 years with proper maintenance.

The Parks and Recreation Department opened bids on July 11, 2023 for the Big Lake Weir and Overbank Improvements project. The lowest responsive and responsible bid was submitted by Stoic Civil Construction, Inc., in the amount of $570,675.  This includes the base bid and Alternate 1 for the installation of a green gabion mattress. Two alternates were not selected for award.

There were a total of 1,456 vendors notified of this project. Eight companies attended the mandatory site visits and six complete bids were received for the project as shown in the attached bid recap.

The benefit of this project includes extending the life of the City's infrastructure as well as improved aesthetics and safety for park patrons.  Not approving the expenditure could result in the failure of the dam and/or continued failure of the adjacent slopes.

Funding for this item is available in the 2022-23 Municipal Drainage CIP and is planned for future years, as well.  Construction services for the Big Lake Weir and Overbank Improvements project, in the total estimated amount of $570,675, will leave a balance of $253,186 for future expenditures.

Approval of this item will support the City's Strategic Plan Critical Success Factor of being an Excellent, Innovative, and Accountable City Government.