To: Members of the Castle Rock Water Commission
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 Design Agreement between the Town of Castle Rock and W.W. Wheeler for the Expansion of Castle Rock Reservoir No. 1 (CRR1) [Plum Creek Trust Property in Douglas County near Sedalia, CO]
Town Council Agenda Date: August 16, 2022
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).
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 $XXXX, and the Wheeler fee is approximately XX% of this construction estimate. Typically design costs are XX% of construction costs. When reviewing the Wheeler design costs for CRR2, the costs are $X and estimated to be XX% of the final construction cost estimate.
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 |
Proposed Motion
“I move to recommend to Town Council approval of the Resolution as presented”
Attachments
Attachment A: Resolution (Not Attached)
Exhibit 1: Services Agreement (Not Attached)
Attachment B: Infrastructure Location Map
Attachment C: Sole Source