HomeMy WebLinkAbout2021 09 27 Consent 302 - West WWTP Reliability Improvements SGS Contracting Services, Inc; Synagro Contract Modification • CONSENT AGENDA ITEM 302
Incnrinreted CITY COMMISSION AGENDA I SEPTEMBER 27, 2021 REGULAR MEETING
1959
TITLE
West WWTP Reliability Improvements. SGS Contracting Services, Inc./Synagro
Contract Modification
SUMMARY
The West WRF is located in the western part of the City and provides sanitary
sewer service to the surrounding community. In 2020, the City initiated
critical repairs to the two WRF treatment units including new influent screens
and aeration systems. During the first treatment unit rehabilitation, the
operating treatment unit experienced operational problems, interruption to
reclaimed water service for some customers, and other impacts to some
adjacent residents. Reliability improvements are recommended to ensure the
fewest number of residents are impacted during rehabilitation of the second
treatment unit. The reliability improvements include some permanent piping
improvements both at the WRF and in the reclaimed water distribution
system.
Disk Filters - Disk filters are a newer treatment technology that replaces the
older traveling bridge sand filters. The sand filters have had various
functional issues and are unreliable. This activity will provide for the
installation of the temporary filter and associated site improvements
including site work, piping, and electrical connections. The disk filter rental is
addressed in a separate agenda item as a response to an invitation to bid
(ITB).
VENDOR TOTAL ESTIMATED COST1
Construction Allowance $225,000
1. Costs will include filter placement/removal, construction materials, and
construction labor.
Temporary Above Ground Water Storage - Water that does not meet public
access reclaimed water standards must be sent to the rapid infiltration basins
(RIB) for disposal. In the event of a plant upset, water will be diverted to the
temporary water storage tanks and then pumped to the RIB. The storage
tank rental and emergency pump rental is addressed in a separate agenda
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item as a response to an invitation to bid (ITB).
VENDOR TOTAL ESTIMATED COST1
Construction Allowance $175,000
1. Costs will include connection to the storage tanks, construction
materials, and construction labor.
Reclaimed Water Piping Improvements - Currently, the discharge from the
WWTP to the RIBS (Rapid Infiltration Basins) utilizes the same piping as public
access reuse. A piping configuration that can create an isolated and
dedicated pipeline to the RIBS is required to maintain reclaimed water to
existing customers and disposal of non public access water simultaneously.
LOCATION TOTAL ESTIMATED COST1
RCW Pipe Jumper at Plant $60,000
1. Estimated cost for piping installation. Final cost to be determined upon
final engineering design.
West WWTP Treatment Unit #2 Piping Improvements - Treatment Unit #2 has
multiple internal treatment flows that are returned to the influent screen of
Unit#2. The additional flow can contribute to the screen overflowing and
causing a spill to the ground on the plant site. Redirecting the internal flows
directly to appropriate treatment basins within treatment Unit#2 will reduce
the flow impact to the influent screen.
VENDOR TOTAL ESTIMATED COST1
Construction Allowance $30,000
1. Estimated cost for piping installation. Final cost to be determined upon
final engineering design.
West WWTP Treatment Unit #1 Structural Repairs - Treatment Unit #1 has
multiple structural deficiencies including broken concrete footing, separating
wall(s), and broken top ring. The extent of the repairs cannot completely be
identified until the tank is emptied and cleaned. The deficiencies were not
evident during priority repair design and are not included in the existing
repair project.
VENDOR TOTAL ESTIMATED COST1
Construction Allowance $110,000
1. Final cost to be determined upon final engineering design.
Priority Repair Construction Contract Modifications - SGS Contracting Services
(general contractor) and Synagro (tank cleaning contractor) are at the end of
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the original contract duration. The contracts need to be extended to allow
contractors to complete anticipated work. An additional three hundred (300)
days of time is recommended to be approved for each contract. SGS
Contracting Services has reached the approved contract contingency amount
with additional approved change order work. This is work in addition to the
original scope of work. Additional funds are required to be approved to
continue anticipated change order work. An additional $600,000 is
recommended to be approved. Synagro will need additional approved
contract contingency to address additional work to dispose of inert material
and additional labor to reduce the overall on-site work timeframes. An
additional $100,000 is recommended to be approved.
RECOMMENDATION
Staff recommends the City Commission authorize the City Manager to
execute contract changes for SGS Contracting Services to add additional
contract time and up to $600,000 of additional expenditures. Authorize the
City Manager to execute contract changes for Synagro to add additional
contract time and up to $100,000 of additional expenditures.
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