To: Members of the Castle Rock Water Commission
From: Mark Marlowe, P.E., Director of Castle Rock Water
Matt Benak, P.E., Water Resources Manager
Lauren Moore, Water Resources Project Manager
Title
Resolution Approving a Construction Contract with ???? for the 2025 Denver Basin Aquifer Wells Rehabilitation and Pumping Equipment Replacement Project [Three wells within the Meadows, Founders, and Castle Oaks subdivisions] DRAFT
Town Council Agenda Date: March 4, 2025
Body
________________________________________________________________________________
Executive Summary
The purpose of the resolution (Attachment A) is to request Town Council approval of a Construction Contract (Exhibit 1) with XXX (XXX) for the 2025 Denver Basin Aquifer Well Rehabilitation and Pumping Equipment Replacement Project. In 2016, Castle Rock Water started a planned well rehabilitation program. This program is designed to help maintain water production yields from our current deep well assets and to reduce the likelihood of emergency well failures. The program targets wells that are showing declines in well yield and/or have been identified as equipped with older pumping equipment. This program has proven successful over the past nine years due to limited well failures during peak demand season, increased well efficiencies, decreased power consumption, and increases in well yield. The 2023/2024 rehab project included five wells and contributed to an increase in well efficiency of 9% over the past year, as shown below.
|
Year |
Well Production of 2023/2024 Rehab Project Wells |
|
2023 (pre-rehab) |
727 gpm |
|
2024 (post-rehab) |
790 gpm |
This spring, CRW is targeting three Denver Basin wells for planned rehabilitation and equipment replacement with XXX. Attachment B shows the locations of the wells that will be rehabilitated. CRW recommends approval of a construction contract with XXX in the amount of $XXX,XXX.XX plus a ten percent Town-managed contingency in the amount of $XX,XXX for a total project cost with XXX of $XXX,XXX.XX. The schedule is critical for this project given the need for these wells during irrigation season. Work will begin immediately upon contract approval and is scheduled for substantial completion by May 2025.
Notification and Outreach Efforts
All work will be completed on Town of Castle Rock property. Notification and outreach efforts will include postcard mailers to nearby homes describing the project details such as location, dates, and work hours. Additionally, the project will be listed on the Castle Rock Water website.
Discussion
It is important to keep our existing infrastructure operating in an efficient manner to ensure that peak water demands during the summer months can be met, without resorting to water curtailment measures due to well failures. In order to do this, the Water Resources Division has established a yearly rehabilitation and equipment replacement program for priority deep Denver Basin wells. A formalized program helps mitigate emergency well services due to pumping equipment failure. This is accomplished by identifying the wells that are showing declines in production due to biofouling and wells with older pumping equipment. Replacing older pumping equipment often provides the opportunity to resize equipment so that better well efficiency is achieved, reducing the long-term costs of operating the wells. CRW typically budgets $1,000,000 annually for repair and maintenance.
The following wells are identified for the 2025 Denver Basin Aquifer Well Rehabilitation and Pumping Equipment Project: Arapahoe Aquifer Wells CR-28R, CR-39, and CR-123. The combined daily production from the wells is 1.0 million gallons per day, which collectively represents approximately 5% of our 5-year average peak Summer daily demand.
Castle Rock Water sent out an Invitation to Bid on Rocky Mountain BidNet. The following table is a summary of the bids:
|
XXX |
XXX |
XXX |
|
$XXX |
$XXX |
$XXX |
Following conversations with the bidders related to schedule and pricing, CRW Staff decided to move forward with XXX. XXX has successfully worked with the Town on previous well rehabilitation projects, including XXX.
Budget Impact
Funding for the project will come from the following account: CIP Repair and Maintenance - Wells 210-4250-442.40-37, which has a balance of $1,000,000.
|
Project Account |
Contract Amount |
Contingency |
Total Authorization |
|
210-4275-442.40-37 Repair & Maintenance - Wells - 2025 |
$XXX |
$XXX |
$XXX |
Proposed Motion
“I move to recommend to Town Council approval of the Resolution as presented”
Attachments
Attachment A: Resolution (Not Attached)
Exhibit 1: Construction Contract (Not Attached)
Attachment B: Location Maps