HomeMy WebLinkAboutA014 - Resolution accepting the Water Treatment Plant Lime Pond Underdrain Improvements Project as completed by Con-Struct, Inc., of Ames, IA, in the amount of $204,369ITEM #:17
DATE:11-25-25
DEPT:W&PC
SUBJECT:FINAL COMPLETION OF WATER TREATMENT PLANT LIME POND
UNDERDRAIN IMPROVEMENTS PROJECT
COUNCIL ACTION FORM
BACKGROUND:
The Water Treatment Plant uses a lime softening process that produces a "lime residual"
material that is stored and dewatered in three on-site holding ponds. Annually, the lime ponds
are excavated by a contractor who land applies the material to farm fields as an agricultural
soil amendment.
The lime ponds contain a buried drainage system to enhance dewatering of the residuals and
reduce the annual hauling and disposal costs. Over time, these systems became damaged
during repeated lime excavation activities and no longer functioned as intended. In 2021, the
City reconstructed one of the ponds' underdrain systems as a trial project to confirm the
dewatering capabilities before spending money to rebuild all three ponds. That project was
successful, and staff therefore moved forward with reconstructing the underdrains in Cells 1
and 3 (this project). The improvements included installation of two mid-line underdrain tile lines
to support more efficient dewatering of the residuals.
On November 12, 2024, Council awarded a contract to Con-Struct, Inc. in the amount of
$200,669 to install the new underdrain system. One change order was executed in the
amount of $3,700 for pumping excess rain water from one of the ponds during the construction
p ro c e s s . The final contract amount is $204,369. The total approved budget for the
project was $222,000, and this contract was the only project expense. All work is
complete and ready for final acceptance and closeout.
ALTERNATIVES:
1. Accept completion of the Water Treatment Plant Lime Pond Underdrain Improvements
Project and authorize final payment to the contractor in accordance with the contract
documents.
2. Do not accept project completion at this time.
CITY MANAGER'S RECOMMENDED ACTION:
All work on this project has been completed and the contract is ready for final
acceptance by Council. There, it is the recommendation of the City Manager that the City
Council accept alternative No. 1 above.
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