|
Item 1.B.
|
| City Council Regular | |
| Date: | 10/25/2021 |
| Title: | W.O. 22-11: Staples Reservoir Evaluation/Design, Professional Services Contract with HDR Engineering |
| Presented by: | Debi Meling |
| Department: | Public Works |
| Presentation: | No |
RECOMMENDATION
Staff recommends that City Council approve the Professional Services Contract with HDR Engineering, Inc. for W.O. 22-11: Staples Reservoir Evaluation/Design in the amount of $174,400.00.
BACKGROUND (Consistency with Adopted Plans and Policies, if applicable)
The 6 million gallon (6MG) Staples Reservoir is the largest tank in the City of Billings water distribution system. This is a round concrete tank, constructed in 1970. The tank is used in conjunction with a 3 MG rectangular concrete tank and the adjacent Staples Pump Station to serve Zones 2, 3, and 4 of the City’s water distribution system. Staples is located north of Rimrock Road, near 17th Street West.
In 2002, cracking was detected in the floor of the 6 MG tank, resulting in leaking. Horizontal cracks were also detected in the baffle wall, as well as a void area under the floor slab. These cracks were repaired at that time, but some minor leaking still existed. Further review showed leaking occurring at the floor-to-wall joint, which was subsequently repaired, and a spray-on liner was installed. In 2010, additional cracks developed in the liner, resulting in new leaking. A repair of the tank floor was completed in 2010. However, some leaking resumed earlier this year. Settlement of the tank floor on the south side of the tank was observed as recent as August 2021. A temporary repair was completed by Liquid Engineering in mid-August 2021 and the leak appears to be mitigated. The foundation drain was able to handle all leaking water and conveyed it to the storm drain, so no property damage occurred.
The City requested proposals for professional engineering services from a prequalified list to provide an evaluation of the tank and the ground/subgrade under and around the tank, a recommendation(s) of mitigation, and the respective design(s) for this mitigation. Potential options include, but are not limited to, repair of the existing tank, construction of a new tank inside the existing tank, demolition of the existing tank and construction of a new tank on the same site, and/or construction of a new tank at an alternative site.
HDR Engineering was selected for the project using the proposal process. HDR Engineering, AE2S, KLJ Engineering, and Morrison Maierle submitted proposals. The consultant selection was based on Project Team and Availability; Project Approach; and Firm Qualifications and Experience as related to the project needs. This initial contract includes project management, reservoir/site evaluation, recommendation and design of a short-term repair (to allow the reservoir to be operable during summer of 2022), Zone 2 storage evaluation, recommendation of long-term mitigation, and evaluation of life-cycle costs. Bidding services, construction administration, and design of the long-term mitigation (including any new reservoirs) are not included in this contract, and will be added by amendment in the future as needed.
In 2002, cracking was detected in the floor of the 6 MG tank, resulting in leaking. Horizontal cracks were also detected in the baffle wall, as well as a void area under the floor slab. These cracks were repaired at that time, but some minor leaking still existed. Further review showed leaking occurring at the floor-to-wall joint, which was subsequently repaired, and a spray-on liner was installed. In 2010, additional cracks developed in the liner, resulting in new leaking. A repair of the tank floor was completed in 2010. However, some leaking resumed earlier this year. Settlement of the tank floor on the south side of the tank was observed as recent as August 2021. A temporary repair was completed by Liquid Engineering in mid-August 2021 and the leak appears to be mitigated. The foundation drain was able to handle all leaking water and conveyed it to the storm drain, so no property damage occurred.
The City requested proposals for professional engineering services from a prequalified list to provide an evaluation of the tank and the ground/subgrade under and around the tank, a recommendation(s) of mitigation, and the respective design(s) for this mitigation. Potential options include, but are not limited to, repair of the existing tank, construction of a new tank inside the existing tank, demolition of the existing tank and construction of a new tank on the same site, and/or construction of a new tank at an alternative site.
HDR Engineering was selected for the project using the proposal process. HDR Engineering, AE2S, KLJ Engineering, and Morrison Maierle submitted proposals. The consultant selection was based on Project Team and Availability; Project Approach; and Firm Qualifications and Experience as related to the project needs. This initial contract includes project management, reservoir/site evaluation, recommendation and design of a short-term repair (to allow the reservoir to be operable during summer of 2022), Zone 2 storage evaluation, recommendation of long-term mitigation, and evaluation of life-cycle costs. Bidding services, construction administration, and design of the long-term mitigation (including any new reservoirs) are not included in this contract, and will be added by amendment in the future as needed.
ALTERNATIVES
City Council may:
- Approve award of a Professional Services Contract with HDR Engineering, Inc; or,
- Not approve a contract with HDR. If this agreement is not approved, valuable time will be lost to evaluate the reservoir, repair the reservoir, and be ready for operation again in the summer of 2022, which could adversely affect the City's ability to provide sufficient quantities of water during the next high-demand season.
FISCAL EFFECTS
The contract is in the amount of $174,400.00 and is being funded with water funds as approved in the FY22 budget. There are adequate funds available for this contract amount.
Attachments
- WO 22-11 Services Agreement-HDR
- WO 22-11 Appendix A
- WO 22-11 Appendix B
- WO 22-11 Appendix C
- WO 22-11 Appendix D
- WO 22-11 Appendix E
- WO 22-11 Appendix F