To: Honorable Mayor and Members of Town Council
Through: David L. Corliss, Town Manager
From: Mark Marlowe, P.E., Director of Castle Rock Water
Shawn Griffith, Assistant Director of Operations & EHS
Title
Resolution Waiving the Formal Written Bidding Requirement on the Basis of Sole Source and Approving an Equipment and Services Acquisition Agreement with Pall Corporation for the Plum Creek Water Purification Facility Pall Membrane Filter Module Replacement Project [Entire Castle Rock Water Service Area]
Body
________________________________________________________________________________
Executive Summary
Castle Rock Water (CRW) seeks Town Council approval of a Resolution (Attachment A) approving an agreement (Exhibit 1) with Pall Corporation, for the Plum Creek Water Purification Facility (PCWPF) Pall Membrane Filter Module Replacement Project, for the amount of $365,899, plus a 5% contingency of $18,295, for a total authorization amount of $384,194, as well as a sole source justification (Attachment B).
Pall will provide the membranes and CRW staff will install the membranes. These modules will be ordered in January, but due to supply chain issues, the modules will not be installed until after the 2023 demand season.
Notification and Outreach Efforts
This project is security sensitive and no public outreach is planned. Work will be performed at remote CRW sites and will be done out of the public eye.
History of Past Town Council, Boards & Commissions, or Other Discussions
The engineering contract for PCWPF, which included the Pall Membrane system, with Burns and McDonnell was approved by Council on January 20, 2011 and constructed by Moltz Construction. The plant began operations in 2013 with three Pall Membrane filtration system racks. The expansion of the original Pall membrane system at PCWPF was approved by council on September 20, 2016, which added another rack and increased capacity by 2 million gallons (MG).
This item was presented to Castle Rock Water Commission on December 14, 2022 under upcoming Town Council items. CRW Commission supported the project by general consensus.
Discussion
The Pall membranes at PCWPF have been in continuous operation since 2013 and are nearing the end of their operational lifespans. PCWPF operates four module racks and all will need to be replaced over the next several years. Staff requests the replacement of all the modules in Pall Filter Rack 1 in 2023, and plans to replace all the modules in the other racks over the next few years, by replacing Rack 2 in 2024, Rack 3 in 2025, and Rack 4 in 2026. The membranes have an operating lifespan of 10-15 years and over time, lose filter performance due to age and irreversible fouling.
The Pall Aria microfiltration system at PCWPF is designed to treat surface water to remove biological contaminants for drinking water treatment. The Pall filters provide an absolute barrier to disease causing organisms and particulate matter down to a pore size of one micron (0.0001 millimeter) in size. The system is highly effective at removing bacteria and parasites like giardia and cryptosporidium and receives removal credit to 99.9% (3 log) through the Colorado Department of Public Health and Environment. The membranes are also effective at removing coagulated organic carbon.
CRW operates and maintains four racks of Pall Aria pressure membranes at PCWPF, with each rack having the capacity to treat 2 million gallons/day (mgd), for a total treatment capacity of 6 mgd, with a redundant capacity of 2 mgd. Individual racks can house up to 78 modules, each containing hundreds of hollow fiber membranes; constructed of polyvinylidene difluoride, a specialty plastic. The racks were originally installed with only 64 modules. In addition to replacing the original 64 modules, another 14 modules will be supplied to completely fill Rack 1. Adding the extra 14 modules will reduce the pressure across the membranes, improve efficiency, and extend the lifespan of the modules.
The scope of work includes:
• Delivery of 78 new filter modules and associated ancillary installation hardware
• A Pall technician to provide onsite supervision of CRW plant maintenance personnel as modules are removed and replaced
• Technical support to perform startup and performance testing, certification, and documentation
Budget Impact
CRW has budgeted for these replacements. Funding for this purchase will come from the 2023 Water Resources Plant Operations Repair & Maintenance Equipment fund, after a budget transfer from the Water Resources CIP Operations & Maintenance account, as follows:
|
Fund Name |
Account Number |
Cost |
Budget Transfer Amount |
2023 Account Balance |
Account Balance after Transfer |
|
CIP Operations & Maintenance |
211-4375-443.40-90 |
|
-$500,000 |
$960,000 |
$460,000 |
|
Plant Operations Repair & Maintenance |
211-4360-443.40-32 |
$384,194 |
|
$3,279 |
$119,085 |
|
Total Cost |
|
$384,194 |
|
|
|
Staff Recommendation
Staff recommends Town Council approval of a Resolution approving a sole source justification and an agreement with Pall Corporation for the PCWPF Pall Membrane Module Replacement Project in the amount of $365,899, plus a 5% contingency of $18,295, for a total authorization amount of $384,194.
Proposed Motion
“I move to approve the Resolution as introduced by title.”
Alternative Motions
“I move to approve the resolution as introduced by title, with the following conditions: (list conditions).
“I move to continue this item to the Town Council meeting on _____ date to allow additional time to (list information needed).”
Attachments
Attachment A: Resolution
Exhibit 1: Agreement
Attachment B: Pall Corporation Sole Source Justification