HomeMy WebLinkAbout04-05-2016 Item 05 Terrace Hill and Wash Water Tanks Maintenance Specification No. 91425
Meeting Date: 4/5/2016
FROM: Daryl R. Grigsby, Public Works Director
Prepared By: Manny Guzman, Senior Civil Engineer
SUBJECT: TERRACE HILL AND WASH WATER TANKS MAINTENANCE;
SPECIFICATION NO. 91425
RECOMMENDATION
1. Approve a transfer of $57,000 from the Water Storage Reservoirs Maintenance and Tank
Master Account to the design phase of the Terrace Hill and Wash Water Tanks Maintenance
project account.
2. Approve a transfer of $26,484 from the Water Completed Projects Account to the design phase
of the Terrace Hill and Wash Water Tanks Maintenance project account.
DISCUSSION
Background
The City has over 180 miles of pipeline providing potable water to its citizens and businesses.
These pipelines are connected to water storage tanks around the City. Water storage is provided
in eleven tanks and two reservoirs located throughout the City. The eleven tanks range in size
from 40,000 to 7.5 million gallons. The two reservoirs are a combination of above grade steel
tanks and underground concrete reservoirs with a total combined storage capacity of
approximately 26 million gallons.
Regular maintenance of water storage tanks is important for economic, environmental, and
health reasons. The effects of corrosion on steel tanks can lead to structural failure, leak s, and
water contamination, which can affect public health. The City hired Advantage Technical
Services (ATS) in 2009, to inspect the interior and exterior of several of the City’s water storage
tanks. Advantage Technical Services prepared a written assessment report that included
observations, recommendations, and preliminary repair cost estimates. Staff worked with ATS to
assign a priority ranking to each of the maintenance recommendations. The Water Treatment
Facilities Wash Water and Terrace Hill tanks were determined to be high priorities because of
coating deficiencies and localized foundation settlement.
Staff utilized the On-Call Civil Engineering Services list to request proposals from two firms.
Use of the on-call services list enables staff to quickly secure proposals for design services, since
the firms are prequalified through a rigorous prequalification process. Staff requested proposals
from Michael K Nunley & Associates (MKN) and Water Systems Consulting (WSC), both of
which submitted proposals with a similar work scope. However, after evaluating and comparing
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proposals, it is recommended to award this work to MKN because of the lower cost proposal (26%
less).
Both firms submitted proposals that are higher than the City staff estimated design costs. The
increased design cost is related to additional work scope that was added to address water quality
issues experienced in the southeastern part of the City. Staff has determined that these water
quality issues can be addressed by piping changes at the Terrace Hill Tank. The piping changes
at the Terrace Hill Tank will force water through the tank and eliminate the water quality
problem.
FISCAL IMPACT
This project was approved as part of the 2015-17 Financial Plan pages 3-50 to 3-53. A total of
$57,500 was budgeted for the Terrace Hill and Wash Water Tanks design work. However, after
identification of the additional work scope, there is insufficient funding to complete the project
design as originally budgeted. The table below indicates a design funding shortfall of $26,484.
Staff is proposing to cover this shortfall by using available funding from the Water Fund’s
Completed Projects Account. The Account has an available balance of $46,969. If approved, a
budget amendment request will be processed to make the appropriate transfers and a purchase
order will be executed.
ALTERNATIVE
Deny the additional funding. This is not recommended because completion of the additional
project scope will address water quality issues in the southeastern area of the City.
Attachments:
a - Project Location Map
Current Budget For Project Design $57,500
Cost of Proposed Design Work $83,984
Budget Short Fall ($26,484)
Water Fund Completed Projects Account Current Balance:$46,969
Water Fund Completed Projects Account Balance After
Transfer:$20,485
Terrace Hill and Wash Water Tanks Maintenance (91426)
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