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ITEM 17
City Council Memorandum Public Works & Utilities Memo No. CP23-103
Date:
March 23, 2023
To:
Mayor and Council
Thru:
Joshua H. Wright, City Manager
Andy Bass, Deputy City Manager
John Knudson, Public Works and Utilities Director
Kimberly Moon, Capital Projects Manager
From:
Sandra Story, Engineering Project Manager
Subject:
Professional Services Agreement No. WW2211.451, with Wilson Engineers, LLC, for the Ocotillo Water Reclamation Facility Influent Pump Station Odor Control
Construction Management
Services
Proposed Motion:
Move City Council award Professional Services Agreement No. WW2211.451, to Wilson Engineers, LLC, for the Ocotillo Water Reclamation Facility Influent Pump Station Odor Control
Construction Management
Services, in an amount not to exceed $498,330.
Background/Discussion:
The Ocotillo Water Reclamation Facility (OWRF) is located at 3333 South Old Price Road. Biological odor scrubber facilities were installed at three locations as part of the OWRF Expansion project completed in 2017. At that time, only one vendor for this equipment participated in a pilot study designed to prove applicability of this technology for use at OWRF. Upon successful completion of the pilot study, full scale equipment was installed, tested, and commissioned for use at the new 15 million gallon per day facility. Since that time, both the volume and concentration of the incoming wastewater passing through the Influent Pump Station (IPS) has increased. The biological odor control unit installed at the IPS cannot adequately perform during times of peak flow under this new operating condition. Errant escape of odorous air can lead to regulatory violations, complaints from nearby residences, and potentially affect nearby businesses. The odor control system is equipped with a secondary carbon filter that can be effective at removing odor causing gases during peak flows, but the cost and frequency of carbon replacement, in addition to reliance on this system for regulatory compliance and mitigation of neighborhood impacts, makes replacement of this equipment with a more reliable and reactive chemical type odor scrubber system necessary.
The project scope of work consists of project administration, engineering, and resident services. The agreement completion time is 550 calendar days following Notice to Proceed.
A related Construction Manager at Risk Agreement with MGC Contractors, Inc., for the Ocotillo Water Reclamation Facility Influent Pump Station Odor Control, is also scheduled for this City Council meeting.
Evaluation:
The selection process was conducted in accordance with City policy and procedure and State law. This project is being performed under the On-Call Consultant Pre-Qualified List for Water and Wastewater Services. Staff recommends approval of this agreement with Wilson Engineers, LLC, based on qualifications, relevant firm experience, team experience, project understanding, and project approach.
Fiscal Impact
Account No.
Fund Name
Program Name
Dollar Amount
CIP Funded Y/N
615.3910.6210.0000.6WW621
Wastewater Operating
Water Reclamation Facility Imprvmts
$472,967.46
Y
611.3910.6210.0000.6WW621
Wastewater Bonds
Water Reclamation Facility Imprvmts
$25,362.54
Y
Attachments
Location Map
Agreement - Wilson Engineers, LLC
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