|
ITEM 33 |
City Council Memorandum Public Works & Utilities Memo No. UA22-020
|
Date: |
August 23, 2021 |
To: |
Mayor and Council |
Thru: |
Joshua H. Wright, City Manager Debra Stapleton, Assistant City Manager John Knudson, Public Works and Utilities Director |
From: |
Paul Roy, Utility Operations Manager |
Subject: |
Agreement No. WW0-885-4192, Amendment No. 1, with Carbon Activated Corporation, for Activated Carbon |
|
|
|
Proposed Motion: |
Move City Council approve Agreement No. WW0-885-4192, Amendment No. 1, with Carbon Activated Corporation, for activated carbon, in an amount not to exceed $300,000, for a one-year period, October 1, 2021, through September 30, 2022. |
Background/Discussion: |
The Ocotillo Water Reclamation Facility (OWRF) and the Airport Water Reclamation Facility (AWRF) treat over 30 million gallons of sewage daily collected through over 900 miles of sewage collection pipes. Wastewater in the sewage collection system naturally produces noxious hydrogen sulfide gas (H2S), causing odors and deterioration of pipes, manholes, and concrete structures. Although attempts are made to significantly reduce the amount of H2S gas in the collection system, some of this dangerous gas makes its way to the AWRF and OWRF facilities. Once the sewage and any remaining H2S compounds arrive at the AWRF and OWRF, it must be captured and neutralized as it is dangerous to staff, highly corrosive, and may result in odor complaints. Controlling hydrogen sulfide gas at the AWRF and OWRF is achieved with odor control scrubbers. Foul air is pulled into these scrubbers that use either a biological or chemical process to break down the hydrogen sulfide gas. The air is then forced through an activated carbon chamber which traps any remaining hydrogen sulfide compounds. The activated carbon in these systems has a limited life and deteriorates during use. The effectiveness of the carbon in the odor scrubbers at the AWRF and OWRF is nearing the end of its useful life and in need of replacement. Periodic replacement of this carbon will be required to maintain the effectiveness of the system, maintain staff health and safety, and minimize potential odor from the two facilities. |
Evaluation: |
On July 16, 2020, City Council approved an agreement with Carbon Activated Corporation, for activated carbon, for a one-year period, with the option of up to four (4) one-year extensions. The contractor has agreed to extend for one year for the term of October 1, 2021, through September 30, 2022, at the same terms, conditions, and pricing. This is the first extension of the original agreement. |
|
Fiscal Impact |
|
|
|