To: Members of the Castle Rock Water Commission
From: Mark Marlowe, P.E., Director of Castle Rock Water
Roy Gallea, P.E., Engineering Manager
Emily Huth, P.E., Project Manager
Title
Resolution Approving the Construction Contract between the Town of Castle Rock and Garney Companies Inc. for the Ray Waterman Raw Water Raw Water Treatment Center (RWRWTC) and Bell Mountain Ranch (BMR) LAS Conversion Project - Work Package #2 [Ray Waterman Regional Water Treatment Center and Bell Mountain Ranch Water Treatment Plant] DRAFT
Town Council Agenda Date: August 19, 2025
Body
________________________________________________________________________________
Executive Summary
Castle Rock Water (CRW) staff requests approval of a Construction Contract (Attachment A) with Garney Companies (Garney) to complete construction of liquid ammonium sulfate (LAS) chemical conversion projects at the Ray Waterman Regional Water Treatment Center (RWRWTC) and the Bell Mountain Ranch Water Treatment Plant (BMR). This project is being completed in two work packages. Work Package 1 was previously approved for $1,199,662 and is for procurement of long lead equipment. Work Package 2 is $XXX and is for the balance of work to complete the project.
History of Past Town Council, Boards & Commissions, or Other Discussions
CRW Staff presented Work Package 1 to the CRW Water Commission on June 25, 2025, The Commission voted unanimously 7 to 0 to recommend Council approval of the resolution as presented. Work Package 1 was approved by Town Council on July 1, 2025.
Discussions
This contract will include scope at two of the Town’s treatment facilities: RWRWTC and BMR. The work at BMR includes installation of a new liquid ammonium sulfate (LAS) chemical feed system, resulting in the switch from free chlorine to chloramines as the disinfectant in the BMR system to align with the rest of the Town’s water distribution system. The work at RWRWTC will include conversion of the existing anhydrous ammonia chemical system to a liquid ammonium sulfate (LAS) chemical system to improve safety and align with chemicals being used at other facilities in the system. The location of the conversion from free chlorine to chloramines will be modified in the facility to improve operational flexibility and allow the Town to receive WISE flows even when RWRWTC is taken offline.
The flowrates CRW receives from WISE are determined by Aurora Water and CRW must take the water, or pay a fee for not receiving it (known as WISE take-or-pay). CRW is slated to receive higher WISE flows during the 2025/2026 lower demand season (i.e. winter months), which is a trend that is expected to continue in future years. Additionally, CRW is now receiving and transmitting all of Dominion’s WISE and Aurora water supplies through this connection. In the future, CRW will also have additional imported supplies coming into our system at RWRWTC. CRW staff have determined the RWRWTC LAS Conversion project is an emergency project to complete as efficiently as possible during the 2025/2026 low demand season to minimize the take-or-pay fees associated with not being able to receive WISE water when RWRWTC must be taken offline - whether for expected routine maintenance, planned construction projects, or unexpected/emergency repairs.
It is preferred that as much of the construction work be completed as possible in the month of November 2025 because that is when WISE flows will not be provided to CRW. This project will also include some Supervisory Control and Data Acquisition (SCADA) improvements that were originally going to be completed as part of the SCADA Phase V project at RWRWTC. The LAS Conversion cannot be completed without completing some upgrades to the SCADA system, instrumentation, and programming that was originally going to be completed in the SCADA Phase V project. Including a portion of the SCADA work within the LAS Conversion project will help to prevent rework and additional costs.
Given the emergency status of this project, and complexity of coordinating this project with other concurrent projects occurring at RWRWTC, Garney was recommended and selected via sole-source for Work Package 1. Contracting with Garney for procurement of the long lead equipment before receiving pricing for the balance of work was necessary to keep the project moving as closely to the desired schedule as possible. Garney submitted a price for Work Package 2 of $X,XXX,XXX that will be for the balance of the work at both facilities.
Budget Impact
Funding to complete construction of the entire RWRWTC & BMR LAS Conversion project, including Work Package 2, will be provided from three different accounts - listed in the table below.
|
Project |
Account Number |
Budget |
|
Chloramine & WISE Modifications at RWWTC |
211-4375-443.77-72 |
$1,600,000 |
|
Bell Mountain Ranch WTP LAS Conversion |
210-4275-442.79-33 |
$500,000 |
|
SCADA System Improvements |
210-4275-442.75-41 |
$1,150,000 |
|
Total |
|
$3,250,000 |
Garney’s proposed cost to complete Work Package 2 is $X,XXX,XXX Staff recommends including a 10% Town managed Contingency resulting in a total authorization amount of $X,XXX,XXX.
|
Contract |
Garney Contract Amount |
Town Managed Contingency (10%) |
Authorization Amount |
|
Work Package 2 Construction Contract (Garney) |
$X,XXX,XXX |
$XXX,XXX |
$X,XXX,XXX |
Three major components will be funded from the accounts listed above. Those include Work Package 1 Construction Contract (early procurement), Work Package 2 Construction Contract (balance of work), and the Construction Engineering Services. Garney is currently under contract for Work Package 1, and BMcD is recommended for the construction engineering services. CRW plans to present BMcD’s construction engineering services Contract and Garney’s Work Package 2 Construction contract together. The summary table below is included for reference (not all proposed costs are known at this time).
|
Contract |
Status |
Authorization Amount |
|
Work Package 1 Construction Contract (Garney) |
Approved |
$1,319,628 |
|
Work Package 2 Construction Contract (Garney) |
Under Consideration |
$X,XXX,XXX |
|
Construction Engineering Services (BMcD) |
Under Consideration |
$298,096 |
|
Total |
$X,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 Agreement (Not Attached)
Attachment B: Location Map