SUBJECT/RECOMMENDATION:
Title
Approve a work order to King Engineering Associates, Inc. Engineer of Record (EOR) in the amount of $472,848 to provide design, permitting and bidding services related to the Northeast Water Reclamation Facility (WRF) Grit Removal, Salsnes Filter and Equalization Project (15-0045-UT); and authorize the appropriate officials to execute same. (consent)
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SUMMARY:
Northeast Water Reclamation Facility (WRF) experiences daily and seasonal variations in raw sewage flows and pollutant loadings. These variations make operation and control more difficult and costly than treating a more constant rate of sewage flow. A feasibility study conducted by the City showed that the installation of an equalization basin provided more cost effective benefits than comparable in-plant improvements. Because of this, the City has decided to incorporate a 2 million gallon (MG) equalization basin and associated facilities into the treatment process at the Northeast WRF.
An existing tank located in the northwest corner of the site will be demolished and a new “off-line” equalization basin will be constructed in its place.
Also, one of the two primary clarifiers recently failed and must be replaced to ensure the City can continue to comply with its Florida Department of Environmental Protection operating permit. Based on its experience at the Marshall St. WRF, the City has elected to replace the primary clarifiers with Salsnes Filters. Sludge produced by the Salsnes Filters can be discharged directly to the digesters without thickening, which also provides operational cost savings.
Lastly, in order to incorporate the Salsnes Filters into the treatment process, it is necessary to retro-fit the existing picket thickeners with new grit removal devices as used at the Marshall St WRF. This new stacked tray grit removal equipment is needed to remove sand and other inert materials so as to both protect the Salsnes filters and to prevent grit and sand from entering the digesters. The picket thickeners that are currently used to thicken sludge from the primary clarifiers would no longer be needed. As such, these tanks can be used for grit removal, as they had been when they were originally constructed.
The design phase is anticipated to be complete by December 2016.
King Engineering Associates, Inc. is one of the City’s Engineers-of-record, and this work order was negotiated in accordance with the Consultants Competitive Negotiations Act.
APPROPRIATION CODE AND AMOUNT:
0315-96664-561300-535-000-0000 $472,848
Funds are available in capital improvement project 315-96664, WPC R&R, to fund this work order.