To: Members of the Castle Rock Water Commission
From: Mark Marlowe, P.E., Director of Castle Rock Water
Shawn Griffith, Operations Manager
Title
Resolution Waiving Formal Written Bidding Requirements on the Basis of a Sole Source with Calgon Carbon for the Plum Creek Water Purification Facility Granulated Activated Carbon Filter Media Replacement [Plum Creek Water Purification Facility in Castle Rock, CO]
Town Council Agenda Date: November 15, 2022
Body
________________________________________________________________________________
Executive Summary
Castle Rock Water (CRW) staff requests Town Council approval of a Resolution approving a services and acquisition agreement with Calgon Carbon (see Attachment A) to remove and replace the Granulated Activated Carbon (GAC) media from eight gravity filter vessels at the Plum Creek Water Purification Facility (PCWPF), in the amount of $613,164, plus a 5% contingency of $30,659, for a total authorization amount of $643,823. PCWPF is CRW’s advanced treatment plant for purifying reuse water. Reuse water is a key water supply for CRW that will eventually make up approximately 30% of CRW’s total supply. GAC filtration is one of the advanced treatment processes used to purify reuse water. GAC media needs to be replaced or regenerated on a regular cycle, estimated to be every two to three years. CRW has been monitoring the performance of the existing GAC media and has determined that replacement or regeneration is coming due. Full replacement and / or regeneration of the GAC media will take approximately five months.
Discussion
GAC is a porous adsorption filter media that is extremely useful for removing a variety of synthetic and organic compounds, contaminants, micro-pollutants, disagreeable tastes and odors that are often found in drinking water treatment sources. Depending on filter operating time and contaminant loading, GAC eventually degrades and loses its ability to bind with pollutants, at which time the GAC needs to be replaced and / or regenerated.
In 2021, as part of the new advanced treatment processes (ATP), CRW began using GAC, with the installation of eight gravity filter vessels, each filled with 40,000 pounds of carbon media. Recent testing and calculations show that the media performance is degrading and contaminants are beginning to break through the filters, indicating that the media should be replaced. The ATP design engineering firm, Burns and McDonnell, predicted that the GAC media would last about two to three years, which appears to be correct.
CRW is seeking to participate in Calgon Carbon’s Custom Municipal Reactivated (CMR) program, which revitalizes the spent media for reuse. The process requires the removal of the spent media from the first two GAC vessels, which is then replaced with new or virgin F300 GAC media. The spent media from the first two vessels are then transported to Arizona for regeneration. The product is regenerated by baking the media, without oxygen, to temperatures above 1,700 degrees Fahrenheit. At that point, a portion, equaling 20% of virgin GAC, is added to the regenerated batch, to complete the lot. The regenerated CMR media is then transported back to Castle Rock.
Calgon Carbon will then remove the spent media from the next two vessels and replace that media with the recently regenerated CMR media. This process will continue until all of the media is exchanged in the eight vessels. The CMR turnaround is expected to take five weeks per cycle to remove, regenerate, and reinstall the media in two vessels. The entire project is scheduled to be completed by April 15, 2023, before demand season begins.
The final CMR load is considered a swing load, that Calgon Carbon will store at their facility in Arizona for use two years later, when the GAC vessel’s media replacement cycle begins again in 2025. The cost for the swing load is not included in this purchase.
|
Load Type |
Volume (lbs.) |
Price |
|
Virgin |
80,000 |
$179,691 |
|
CMR |
240,000 |
$433,473 |
|
Total |
|
$613,164 |
The purchase with Calgon Carbon will be conducted through an approved sole source justification, (see Attachment B), as they are the only provider found with the ability to regenerate and store CMR GAC for future replacement.
Budget Impact
Funding for this purchase will come from Water Resources/Plant Operations Division/Repair & Maintenance account which has a current balance of ($88,397). Therefore, a budget transfer from the following two accounts will be necessary:
|
Fund Name |
Account Number |
Budget Transfer Amount |
Account Balance After Transfer |
Cost |
Account Balance after Purchase |
|
CIP Operations & Maintenance |
211-4375-443.40-90 |
$582,163 |
$0.00 |
|
|
|
CIP Water Rights Acquisition |
211-4375-443.75-47 |
$250,057 |
$6,369,943 |
|
|
|
Water Resources Repair & Maintenance Equipment Account |
211-4360-443.40-32 |
$832,220 |
-$88,397 |
$643,823 |
$100,000 |
|
Totals |
|
$832,220 |
|
$613,164 |
|
Proposed Motion
“I move to recommend to Town Council approval of Resolution as presented”
Attachments
Attachment A: Resolution (Not Attached)
Exhibit 1: Agreement
Attachment B: Sole Source Justification