cover
TO: Mayor Thomas J. Weisner
FROM: David E. Schumacher, P.E.; Superintendent of Water Production
DATE: November 3, 2015
SUBJECT:
A Resolution Authorizing an Addendum to the Amended and Restated Potable Water Service Agreement with Calgon Carbon Corporation (Calgon) for the lease of Granular Activated Carbon (GAC) in filters 9 - 12 for the Water Production Division (WPD).
PURPOSE:
To obtain City Council approval for an addendum to the subject agreement for pricing and installation of GAC for filters 9 - 12 in 2016 at the City of Aurora Water Treatment Plant (WTP).
BACKGROUND:
The WTP has 12 dual-media filters which contain sand and GAC which are used to remove solids prior to disinfection of the water. In addition, the GAC media serves to remove taste and odor compounds which are adsorbed onto the GAC which remains in the filter. Over time the GAC is expended (spent) and needs to be replaced/refreshed, typically between 36 and 42 months. This is done on a staggered schedule in three groups of filters, filters 1 - 4, 5 - 8, and 9 - 12.
The WPD currently leases GAC under an existing agreement with Calgon and has long since standardized the use of GAC provided by Calgon. Until most recently, the WPD has always utilized brand new GAC, otherwise known as "virgin" GAC. Due to escalating costs of virgin GAC, Calgon has provided an option to utilize "reactivated" GAC under their Custom Municipal Reactivation (CMR) program. Reactivation, in simple terms, is the high temperature heating of the spent GAC which volatilizes the adsorbed compounds thus returning the GAC to additional productive service. The opportunity for cost savings from utilization of CMR GAC is significant without sacrificing substantial performance when compared to virgin GAC.
CMR GAC is currently in use in filters 2, 4, 7, and 8 at the WTP. Based upon the results of recent testing of this CMR GAC, performance and longevity have been comparable to that of the virgin GAC in filters 1, 3, 5, and 6.
DISCUSSION:
Due to the demonstrated performance of CMR GAC currently in use at the WTP, all GAC to be replaced in filters 9 - 12 will be CMR GAC at a cost of $31.95/cubic foot in 2016 (a 7.6% cost increase from the previous year). The total cost for the 36 month lease term for the CMR GAC in filters 9 - 12 will be $264,546.00.
As a comparison, virgin GAC pricing in 2016 would be $51.32/cubic foot, or $424,929.60 per the 36 month lease term. Thus, when compared to virgin GAC over the 36 month lease term, the savings realized from the use of CMR GAC is $160,383.60 or 37.7%.
Funding for leasing GAC is provided annually in the WPD budget Account No. 510-4058-511-38-28.
IMPACT STATEMENT:
None.
RECOMMENDATIONS:
That the City Council authorizes an addendum to the Amended and Restated Potable Water Service Agreement with Calgon for pricing of GAC to be installed in filters 9 - 12 in 2016. It is further recommended that this matter be forwarded to the Buildings, Grounds, and Infrastructure Committee for their review and approval.
cc: Alderman Garza, Chairman
Alderman Johnson
Alderman Mesiacos
Alderman Bohman, Alternate
CITY OF AURORA, ILLINOIS
RESOLUTION NO. _________
DATE OF PASSAGE ________________
title
A Resolution Authorizing an Addendum to the Amended and Restated Potable Water Service Agreement with Calgon Carbon Corporation for the lease of Granular Activated Carbon in filters 9 - 12 for the Water Production Division.
body
WHEREAS, the City of Aurora has a population of more than 25,000 persons and is, therefore, a home rule unit under subsection (a) of Section 6 of Article VII of the Illinois Constitution of 1970; and
WHEREAS, subject to said Section, a home rule unit may exercise any power and perform any function pertaining to its government and affairs for the protection of the public health, safety, morals, and welfare; and
WHEREAS, the Water Production Division utilizes granular activated carbon (GAC) in the City Water Treatment Plant filters and the GAC is leased from Calgon Carbon Corporation under an existing lease agreement; and
WHEREAS, the Water Production Division seeks to replace the GAC filter media in filters 9 - 12 with reactivated GAC in 2016 at a unit cost of $31.95 per cubic foot or a total cost of $264,546.00 over the 36 month lease period; and
WHEREAS, funding for leasing of GAC is provided annually in the City Budget in Account No. 510-4058-511-38-28;
NOW, THEREFORE, BE IT RESOLVED by the City Council of the City of Aurora, Illinois, as follows: does hereby authorize the Purchasing Director to execute the Addendum to the Amended and Restated Potable Water Service Agreement with Calgon Carbon Corporation, Pittsburgh, PA, for the lease of Granular Activated Carbon in filters 9 - 12 at the City of Aurora Water Treatment Plant.