Title
Consider and take action on a resolution ratifying the agreement with D. Wagner Construction Co., Inc. for the Emergency Repair of the 42-inch gravity sewer located at the Butler Rd Lift Station in an amount not to exceed $472,874.40 (Director of Public Works)
Background:
Approval of this item will ratify the agreement with D. Wagner Construction Co., Inc. for the Emergency Repair of the 42-inch gravity sewer located at the Butler Rd Lift Station in an amount not to exceed $472,874.40.
On Thursday, January 16, 2025 staff identified a large sink hole within the lift station perimeter fencing and the adjacent Mustang Cat facility. The cause appeared to be similar to what we recently experienced at Smith Lane and East Main LS’s, which was the failure of early 1980’s era ductile iron pipe and associated concrete manhole structure. It was deemed an “Emergency Status” repair due to the size of the LS and its’ associated service area, which provides sanitary sewer conveyance for 80 percent of the City, west of I-45. The sink hole threatened further collapse of soil conditions that could have severely impeded gravity flow into the LS wet well, along with threatening the onsite electrical control panel, genset, ATS, odor control system, and electrical service pole.
D. Wagner Construction was contacted and was able to respond the following day to assess the failure and begin formulating a plan to stabilize the area around the failed gravity line and manhole structure to ensure an acceptable level of flow into the wet well prior to forecasted rain and Winter Storm Enzo. Wagner was able to install sheet piling to sustain flow during the weather event and further protect the electrical gear. This effort was successful and prevented costly damage to the lift station electrical infrastructure. Wagner, Sander Engineering, and City staff continued to work on alternative pipe alignments that helped us determine the quickest most cost-effective repair method.
Contributing cost factors of the emergency repair include but are not limited to, the depth of the excavation, size of gravity pipe and manhole structure, well point required for extreme groundwater experienced during the repair, large capacity bypass pumping for the duration of the repair, and internal coating of the repaired gravity sewer.
In an effort to control cost City staff requested Wagner to provide a daily rate for labor and equipment, with the understanding that once repair methods were identified actual repairs would be billed on a time and materials basis. Additional cost control efforts were taken on by City staff in support of the repair activities and monitoring efforts to ensure no disruption of service to our customers. These efforts include but are not limited to the following (approximate cost):
Wagner Construction - $472,874.40
Brooks Concrete - $9,366.33 (Restoration of onsite concrete surface and Mustang Cat driveways)
Wastewater Transport Services - $34,412 (Removal of displaced soil from wet well)
Sander Engineering - $6,447.44 (Support Services)
Due to the magnitude of the repair activity the City accommodated Wagner’s request for partial payment in the amount of $71,281.20 on February 11, 2025. The City received the final invoice dated March 7, 2025 for the remaining balance of $401,593.20. This agenda item addresses the ratification of Wagner’s total cost in the amount of $472,874.40. The $472,874.40 is available from funds in the FY2025 CIP for the waterline construction along Deke Slayton (WT1904) in the budgeted amount of $610,000. The Deke Slayton project was reduced to a point repair and paid from the Water operating budget. If approved, the $472,874.40 will be reallocated to the Annual Lift Station Improvement Program (WW1901) as sub-project WW1901G - Butler Lift Station Emergency Repair.
Attachments:
1. Proposed Resolution
2. Exhibit A - Agreement with D. Wagner Construction Co., Inc.
3. Emergency Justification Email
4. Sanders Engineering - Support Services Recommendation 02-13-2025
5. Sanders Engineering - Support Services Recommendation (Final) 03-13-2025
6. Aerial Map
7. Vendor Report Card
CONTRACT ORIGINATION: Agreement has been reviewed by the City Attorney’s Office
FUNDING
{X} Funding in the amount of $472,874.40 is available from Revenue Supported Cash, fund 1055, with expenses charged to project expense string WW1901G-CONSTRUCT-CONSTRUCT-RS Cash.
STRATEGIC PLANNING
{X} Addresses Strategic Planning Critical Success Factor #1 - Develop and Maintain our Infrastructure