To: Honorable Mayor and Members of Town Council
Through: David L. Corliss, Town Manager
From: Mark Marlowe, P.E., Director of Castle Rock Water
Roy Gallea, P.E., Engineering Manager
Shantanu Tiwari, CIP Project Manager
Title
Resolution Approving a Services Agreement with W.W. Wheeler & Associates, Inc., for the Castle Rock Reservoir No. 1 Expansion Project [Plum Creek Trust Property in Douglas County near Sedalia, CO]
Body
________________________________________________________________________________
Executive Summary
Castle Rock Water is seeking Town Council approval of a Resolution (Attachment A) approving a services agreement Exhibit 1 with W. W. Wheeler & Associates (Wheeler) to provide design services for the enlargement of Castle Rock Reservoir No.1 (CRR1). The expansion seeks to increase the storage capacity of the reservoir from its current 240 acre-foot capacity to approximately 500 acre-feet. Wheeler has proposed a fee of $304,800 for this work. Additionally, staff is also requesting approval of a 10% Town-managed contingency ($30,480) for a total project authorization of $335,280.
Wheeler shall undertake the work upon execution of the agreement and shall complete work no later than August 31, 2023. A location map for the proposed Castle Rock Reservoir No. 1 is provided
(Attachment B).
History of Past Town Council, Boards & Commissions, or Other Discussions
Castle Rock Water staff presented this item to the Castle Rock Water Commission at their meeting held on July 27, 2022, and the Castle Rock Water Commission voted 6 to 0 to recommend Town Council approve the Resolution as presented.
Discussion
Castle Rock Water’s long-term goal is to provide a sustainable, reliable, and renewable water supply for all of Castle Rock’s citizens and businesses. Water storage plays a primary role in Castle Rock Water’s long-term Water Resources Strategic Master Plan (Plan). As part of this Plan, the Town of Castle Rock purchased water supply infrastructure from United Water & Sanitation District in 2017. A 240 acre-foot raw water storage reservoir, Castle Rock Reservoir No.1, was part of this purchase. Due to poor construction practices and the deterioration in the reservoir liner, the Town has been forced to reduce the operating capacity of the reservoir from 240 to 180 acre-feet (a 25% reduction). CRW staff seeks to retain Wheeler to design an expansion of the reservoir to increase the storage capacity to approximately 500 acre-feet. W. W. Wheeler & Associates, Inc. is familiar with and has a history with the project site. Wheeler staff designed the original Plum Creek Diversion System and are the current design engineers for the Town's future reservoir, Castle Rock Reservoir No. 2 (CRR2).
Staff is recommending that this construction contract be sole-sourced (Attachment C) to Wheeler due to the urgency of this project and to get the permitting process started with the State Engineer’s Office and Douglas County. Additionally, with Wheeler engaged in the design of CRR2 and their familiarity with the storage system as a whole, they are uniquely qualified to design this project. In reviewing their proposed fee, staff believes the fee to be competitive. For reference, the estimated cost of construction is $25,600,000, and Wheeler is currently contracted with the Town for $713,370. This is approximately 2.8% of the construction estimate for the CRR2 design. Typically design costs can range between seven to ten percent of construction costs.
Budget Impact
The Water Resources CIP Account <211-4375-443.79-15> Reservoir Upgrades will be used to fund this project. This account currently has a balance of $ 6,807,968. Staff requests an additional $30,480 (Town-managed 10% contingency) be authorized for a total project authorization of $335,280.
|
Account Number/Name |
Total Cost |
|
WR CIP <211-4375-443.79-15> Reservoir Upgrades |
$335,280 |
Staff Recommendation
Staff and Castle Rock Water Commission recommend approval of the Resolution approving a services Agreement to provide expansion design services for the CRR1 in the amount of $304,800 plus a 10% contingency for a total authorization of up to $335,280 (Attachment A).
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: Services Agreement
Attachment B: Infrastructure Location Map
Attachment C: Sole Source