TRANSMITTAL LETTER FOR BOARD MEETING OF NOVEMBER 1, 2012
COMMITTEE ON PROCUREMENT
Mr. David St. Pierre, Executive Director
Title
Authority to increase Contract 09-176-3P Sludge Thickening Facilities, Stickney Water Reclamation Plant, to McHugh Construction, in an amount of $596,464.80 from an amount of $164,599,185.43, to an amount not to exceed $165,195,650.23, Account 401-50000-645650, Purchase Order 5001115
Body
Dear Sir:
On March 18, 2010, the Board of Commissioners authorized the Director of Procurement and Materials Management to award Contract 09-176-3P Sludge Thickening Facilities, Stickney Water Reclamation Plant to McHugh Construction, in an amount not to exceed $162,232,344.00. The scheduled contract completion date is April 12, 2014.
As of October 19, 2012, the attached list of change orders has been approved. The effect of these change orders resulted in an increase in an amount of $2,366,841.43 from the original amount awarded of $162,232,344.00. The current contract value is $164,599,185.43. The prior approved change orders reflect a 1.46% increase to the original contract value.
Item 1: A net extra in the amount of $20,471.64 to revise the directional boring requirements for the new 20" Primary Sludge (PSD) lines in order to resolve conflicts with existing utilities. The new dual 20" PSD lines conflict with existing utilities that were not shown on the contract drawings or accounted for under CCO-071. In order to resolve the additional conflicts between the new dual 20" PSD lines and utilities, the boring needs to begin at Sta. 50+15.44; the alignment of new dual 20" PSD lines should be revised to stay beneath G Street for approximately 50 additional feet; and two 45 degree bends for each PSD line should be eliminated. An electrical line to the city water tower needs to be temporarily relocated during boring operations, and restored to its original location after the boring is complete. The contractor needs to temporarily remove a stainless steel ozone pipe and carrier pipe during boring operations and restore the ozone line in its original location after the boring work is complete. Also, the 38' increase in length of bore and jack, as required by CCO-071, shall be deleted. The contractor submitted a cost proposal (CCO-121) for an extra in the amount of $51,489.18 and a credit in the amount of $31,017.54, for a net extra of $20,471.64. The engineer reviewed the proposal, found it to be reasonable and stated via correspondence 3292, that 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.
Item 2: An extra in the amount of $305,000.00 to complete the wiring between the Variable Frequency Drive (VFD) cabinets and the associated transformers for Centrifuges 1-14. Contract drawings show a 4160V power feed going to the centrifuge VFD Panel; the VFD panel is then wired to the main drive motor, the back drive motor, and the oil lube unit. However, the centrifuge manufacturer, Alfa-Laval, requires a separate transformer that steps down the power from 4160V to 480V. The 480V transformer needs to be wired to the VFD. This wiring is not shown on the contract drawings or on the conduit and cable schedule. In order to properly install the centrifuges, the wiring and conduit between the VFD cabinet and the associated transformer for Centrifuges 1-14 needs to be installed. The contractor submitted a cost proposal (CCO-143) for an extra in the amount of $305,000.00. The engineer reviewed the proposal, found it to be reasonable and stated via correspondence 3322, that the Engineering Department would recommend its approval.
Item 3: An extra in the amount of $270,993.16 to modify the digester feed pumps arrangement and piping in the Area 60 - Sludge Blending facility. The contract calls for demolition of all existing digester feed pumps and associated piping in Area 60 and the installation of new pumps and piping. The contract drawings did not show effluent water flushing lines or vents for the new pumps. Also, there are conflicts between the existing piping and electrical panels and the suction and discharge piping for the new pumps. To resolve the conflicts, the following work is required: The orientation of pumps and motors of digester feed Pumps 1, 2, and 3 needs to be modified; the 18" suction headers for the digester feed Pumps 1 through 5 need to be relocated and feed pumps need to be connected to the suction header with 12" suction piping; the 12" discharge piping also needs modification. New flushing, sampling, and vent piping is required for the digester feed pumps. The existing electrical panels for the digester feed pumps and other incidental existing piping need to be relocated to avoid conflict with the new 18" suction header. Additionally, the discharge piping for the sump pumps located on the north wall of the gallery near digester feed Pump 1 needs to be modified by rotating the lines 90 degrees. The contractor submitted a cost proposal (CCO-148) for an extra in the amount of $270,993.16. The engineer reviewed the proposal, found it to be reasonable and stated via correspondence 3311, that the Engineering Department would recommend its approval.
The above two change orders are in compliance with the Illinois Criminal Code since the changes are germane to the contract.
It is hereby recommended that the Board of Commissioners authorize the Director of Procurement and Materials Management to execute three change orders to increase Contract 09-176-3P in an amount of $596,464.80 (0.36% of the current contract value), from an amount of $164,599,185.43, to an amount not to exceed $165,195,650.23.
Funds are available in Account 401-50000-645650.
Requested, Catherine O'Connor, Director of Engineering, MVL:ECB
Recommended, Darlene A. LoCascio, Director of Procurement and Materials Management
Respectfully Submitted, Barbara J. McGowan, 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 November 1, 2012
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