TRANSMITTAL LETTER FOR BOARD MEETING OF DECEMBER 5, 2024
COMMITTEE ON PROCUREMENT
Mr. Brian A. Perkovich, Executive Director
Title
Authority to increase the purchase order for the University of Illinois for 23-170-3C Hydraulic Modeling of the Mainstream Tunnel System, in an amount of $87,454.00, from an amount of $380,311.00, to an amount not to exceed $467,765.00, Account 401-50000-612430, Purchase Order 3124689
Body
Dear Sir:
On May 18, 2023, the Board of Commissioners authorized the Director of Procurement and Materials Management to issue a purchase order and enter into an agreement with the University of Illinois, in an amount not to exceed $380,311.00. The scheduled contract completion date is December 31, 2025.
There are no prior change orders for this contract.
Original Contract Amount $380,311.00
Date of Board Approval 05/18/23
Cumulative Change Order (11/22/2024) $ 0.00
% Change of Original Contract Value 0.00%
Current Contract Value $380,311.00
Requested Increase $ 87,454.00
New Contract Value $467,765.00
% Change of Current Contract Value 23.0%
Total % Change of Original Contract Value 23.0%
The purpose of this agreement is to use the Tunnel and Reservoir Plan (TARP) hydraulic model to study and determine what conditions cause geysering at various TARP structures so that adjustments may be made at the structures to minimize future occurrences of geysering.
At the meeting of September 19, 2024, the Board authorized the Director of Procurement and Materials Management to issue a purchase order and enter into an agreement with Melching Water Solutions LLC, for use of DUFLOW water quality modeling to complete a final optimization plan for discretionary diversion, maximizing attainment of dissolved oxygen standards in the Chicago Area Waterway System. As an input to the DUFLOW water quality model, additional TARP hydraulic model simulations are necessary to predict anticipated combined sewer overflow volumes.
The scope of the change order is to use the TARP hydraulic model to perform multiple water-year length simulations for the Mainstream/Des Plaines and Calumet TARP systems to determine the volume of combined sewer overflows that can be expected with the completion of the McCook reservoir (10 billion-gallon volume, total volume for Stage 1 and Stage 2) versus the existing Stage 1 reservoir that is only (3.5 billion-gallon volume). This data will be provided to Melching Water Solutions for their separate water quality modeling efforts. The contractor submitted a cost proposal for this work as an extra in the amount of $87,454.00 and a credit in the amount of $0.00, for a net extra in the amount of $87,454.00. The Engineer reviewed the proposal and found it to be reasonable and stated the Engineering Department would recommend its approval.
This change order is in compliance with the Illinois Criminal Code since the change is due to circumstances not reasonably foreseeable at the time the contract was signed and is in the best interest of the District.
It is hereby recommended that the Board of Commissioners authorize the Director of Procurement and Materials Management to execute a change order to increase Contract 23-170-3C in an amount of $87,454.00 (23.0% of the current contract value), from an amount of $380,311.00, to an amount not to exceed $467,765.00.
Funds are available in Account 401-50000-612430.
Requested, Catherine A. O’Connor, Director of Engineering, KMF:LS
Recommended, Darlene A. LoCascio, Director of Procurement and Materials Management
Respectfully Submitted, Marcelino Garcia, Chairman Committee on Procurement
Disposition of this agenda item will be documented in the official Regular Board Meeting Minutes of the Board of Commissioners for December 5, 2024
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