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
Title
Resolution Approving an Intergovernmental Agreement for the Construction of a WISE Pump Station at Parker Water & Sanitation District (PWSD) [PWSD’s Rueter-Hess Water Purification Facility in Parker, Colorado] DRAFT
Town Council Agenda Date: April 16, 2024
Body
________________________________________________________________________________
Executive Summary
The purpose of this memorandum is to seek Town Council approval of a resolution (Attachment A) for a cost-sharing intergovernmental agreement (IGA) with Parker Water & Sanitation District (PWSD) for the construction of the WISE pump station and associated infrastructure.
One of Castle Rock’s key pieces of its renewable water supply portfolio is water from the Water Infrastructure and Supply Efficiency (WISE) project. The WISE Program is a source of renewable and sustainable water supply for ten (10) South Metro water providers, including Castle Rock and PWSD. In 2015, a 42-inch steel RidgeGate Line (RGL) was designed and constructed to convey WISE water from the primary WISE East-West transmission main to RGL regional partners. At that time, the associated WISE receiving tank, pump station, and site piping were deferred and the pump station inside PWSD’s existing Rueter-Hess Water Purification Facility (RHWPF) was used to pump WISE water. PWSD is now in need of its own pump station capacity within the RHWPF.
In January 2022, PWSD, Castle Rock and Dominion Water and Sanitation District (DWSD) entered into an IGA for the design of the WISE pump station and infrastructure. HDR was selected as the top respondent with a total design fee of $825,600 (Castle Rock’s portion of the design being $401,372.32). In June 2023, Town Council approved a change order for HDR’s additional design efforts of $228,400 (with Castle Rock’s portion being $123,336). As part of this latest Town Council consideration, HDR is requesting a design change order for $43,010 (with Castle Rock’s portion being $23,225) to cover additional procurement package submittal reviews, value engineering work, updating of the plans and specifications to meet the 2021 International Building Code as now required by Douglas County, and additional surveying for utility locating for natural gas and liquid ammonium sulfate lines on site.
In February 2024, PWSD received construction bids from four general contractors (Filanc, RN Civil, Glacier, and Archer Western) with bids ranging from $14,820,380 to $19,388,900. PWSD is recommending moving forward with a construction contract with Filanc. In addition to the general contractor’s construction costs, there will be costs for HDR’s engineering services during construction, third-party testing, and Xcel Energy’s costs for gas line and electrical service upgrades. The total estimated costs for Castle Rock, with a __% contingency is $____________. A breakdown of these costs is provided in the Discussion section below.
Discussion
The South Metro region has historically been reliant on groundwater for its water supply
resources. With the WISE system coming online in 2018, the Town of Castle Rock and other WISE partners have been enjoying a renewable and sustainable water resource. The WISE system conveys flows via the East-West 54-inch pipeline along E-470 to partners’ individual turnouts and to the 42-inch RGL. The RGL conveys water to the flow control vault located at PWSD’s 10 million-gallon-per-day (MGD) RHWPF site, where it is introduced into the clearwell for mixing and pumped to Zone 2 of PWSD’s distribution system. RGL project partners of PWSD (Castle Rock Water (CRW), DWSD, Stonegate, and Pinery) accept their WISE water deliveries via interconnects from the District’s distribution system.
The pump station was previously deferred due to the WISE ramp-up period from 2018-2024. During the ramp-up, individual member flowrates gradually escalate to their ultimate peak allocations available in June 2025, pending hydrologic conditions. Since 2018, the fully contracted WISE water deliveries were unavailable and the RHWPF pump station was able to meet demands of both PWSD customers and WISE project partners. However, with full WISE deliveries coming online and increasing customer demands within PWSD, the time to build the full WISE infrastructure capacity at PWSD has arrived.
The project will be located on PWSD property of the RHWPF. Key components of the construction project include:
1. A new building to house pump equipment and controls, a new flow control vault, a wet well, a surge tank, chemical facilities, and equipment for adjustment of the chloramine residual in the water. This new facility will also include the piping to connect to PWSD’s water delivery system.
2. The operational flexibility to bypass water within the pump station and an interconnection to RHWPF.
3. Value engineering techniques were used during design to eliminate a permanent backup generator to feed the WISE Pump Station and ancillary equipment. Instead, in an emergency, WISE flows can be directed through the Rueter-Hess Water Purification Facility (RHWPF) which does have a backup generator. The RHWPF has a docking station for a temporary generator as well.
Following the construction of the WISE Pump Station and associated infrastructure, Castle Rock will have a total pumping capacity of 11.5 million gallons per day (mgd). Castle Rock’s pro-rata share of the construction phase is 52% based on a total capacity of 22.2 mgd (Castle Rock with 11.5 mgd or 52%, PWSD with 6.5 mgd or 29% and DWSD with 4.2 mgd or 19%).
A breakdown of the construction phase items is included in Table 1.
Table 1: WISE Pump Station Construction Phase Cost Breakdown
|
Description |
Cost |
|
Construction Bid (Filanc) |
$14,820,380 |
|
Contingency on Construction Bid (7.5%) |
$1,111,529 |
|
Engineering Services During Construction (HDR) |
$916,000 |
|
Third Party Testing Contract (estimate) |
$______ |
|
Xcel Energy (Gas and Electric [estimate]) |
$______ |
|
Total Estimated Construction Cost |
$_____ |
|
Partner Costs |
|
|
Castle Rock (52%) |
$8,953,577 |
|
DWSD (19%) |
$3,271,499 |
|
PWSD (29%) |
$4,993,341 |
Construction is scheduled to start in May 2024 and work is to be completed and operational by June 2025.
Budget Impact
The cost to implement the work is estimated at ____ which includes Filanc’s construction estimate, engineering services during construction (provided by the design engineer, HDR), third-party testing, Xcel costs for gas and electric connections. Castle Rock’s estimated portion of this cost is $___________.
Monies for this project will come from 211-4375-443.77-72 Water Resources, CIP - WISE Infrastructure, Project Code <WR WLI>. This account has a budget of $10,186,050 for 2024.
Proposed Motion
“I move to recommend to Town Council approval of the Resolution as presented”
Attachments
Attachment A: Resolution (Not Attached)
Exhibit 1: Agreement (Not Attached)
Attachment B: History