Title:
Title
Supplemental Agreement: Reservoir Concrete Repair Service
End
FileID
File ID: 2020-01038
Location
Location: Citywide
End
Recommendation:
Recommendation
Pass a Motion authorizing the City Manager or the City Manager’s designee to execute Supplemental Agreement No. 1 to City Agreement PRC001042 with DN Tanks to complete additional permanent spot repairs for the Reservoir Concrete Repair Project, for an amount not-to-exceed $226,200, bringing the agreement’s total not-to-exceed amount to $436,200.
FileName
Contact: Colleen Karbowski, Project Manager, (916) 808-1474; Michelle Carrey, Supervising Engineer (916) 808-1438; Pravani Vandeyar, Water Division Manager, (916) 808-3765; Tony Bertrand, Engineering & Water Resources Division Manager, (916) 808-1461; Department of Utilities
Body
Presenter: None
Attachments:
1-Description/Analysis
2-Supplemental Agreement
Description/Analysis
Issue Detail: The City of Sacramento (City) owns and operates 12 water reservoirs throughout the City. These reservoirs help to maintain pressure throughout the City’s water distribution system and provide emergency storage for fire protection. Three of these reservoirs, UCD Medical Center, Alhambra, and City College Reservoirs, are elevated reinforced concrete structures which house and support steel lined tanks. They were constructed between 1934 and 1938. City staff performed exterior surface inspections of the reservoirs in 2019, which was prompted by evidence of exterior concrete failures at UCD Medical Center Reservoir. Staff observed several locations of concrete delamination and spalling along the exterior surfaces of all three reservoirs. Due to the amount of spot repair locations identified during the first portion of work, only UCD Medical Center Reservoir repair work and inspections at Alhambra Reservoir were completed under the original contract amount.
Additional services are needed to perform the permanent repair of the exterior surface of the remaining two elevated reinforced concrete reservoirs where active concrete spalling and delamination have been observed and to eliminate falling concrete debris hazard to foot traffic below and adjacent to the reservoir sites. These repairs are critical to ensure the safety of City staff, telecom provider staff, and City Fire Department personnel who work in and around Alhambra Reservoir and City College Reservoir.
Policy Considerations: This supplemental agreement exceeds the City Manager’s approval authority and must be approved by City Council.
Economic Impacts: None
Environmental Considerations: The Community Development Department, Environmental Planning Services has reviewed the services needed to support the permanent repair of the exterior surface of the reservoirs and has determined that the project is exempt from California Environmental Quality Act (CEQA) pursuant to CEQA Guidelines Section 15301. Section 15301 exempts project that consist of the operation, repair, maintenance and minor alteration of existing structures, facilities, and mechanical equipment.
Sustainability: The proposed project is consistent with the 2035 General Plan (Section U 2.1.4) by improving infrastructure reliability, which will ensure continued safe operation and maintenance of the existing facilities at Alhambra and City College Reservoirs.
Commission/Committee Action: Not Applicable
Rationale for Recommendation: On February 3, 2020, DOU issued Invitation for Bid (IFB) P20141111005 for Concrete Tank Spot Repair Service. The project was publicly advertised, and bids were received and opened on February 20, 2020. One bid was received from DN Tanks.
This Supplemental Agreement will provide for the permanent spot repair improvements needed to address the remaining issues at Alhambra and City College Reservoirs.
Staff recommends approval of Supplemental Agreement No. 1 to City Agreement PRC001042 with DN Tanks to complete the additional spot repair services on the exterior of the concrete reservoirs associated with the City Reservoir Concrete Repairs Project.
Financial Considerations: Supplemental Agreement No. 1 will increase the contract amount by $226,200, for a revised total not-to-exceed amount of $436,200. Sufficient funding is available in the Reservoir Rehab Program (Z14130500, Fund 6005) to execute the Supplemental Agreement in the amount of $436,200.
There are no general funds allocated or planned for this project.
Local Business Enterprise (LBE): DN Tanks is not an LBE.