To: Honorable Mayor and Members of Town Council
Through: David L. Corliss, Town Manager
From: Mark Marlowe, P.E., Director of Castle Rock Water
Matt Benak, P.E., Water Resources Manager
Zuzana Howard, Water Resources Program Analyst
Title
Resolution Approving the First Amendment to the Intergovernmental Agreement Between the Town of Castle Rock, the South Metro Wise Authority, Dominion Water and Sanitation District, and Parker Water and Sanitation District Regarding the Wise Pump Station and Infrastructure Design [Rueter-Hess Reservoir Water Purification Facility, Parker Water and Sanitation District, Parker, CO]
Body
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Executive Summary
The purpose of this resolution (see Attachment A) is to seek Town Council approval for cost adjustments required by the design consultant (HDR) for the design of an expansion to Parker Water and Sanitation District’s (PWSD) WISE pump station and associated infrastructure. Castle Rock entered into an intergovernmental agreement (Attachment B) with PWSD for this work under approval from Castle Rock’s Town Council on December 7, 2021.
During the course of project design HDR recognized additional design efforts that needed to be included for an effective final design. The cost adjustments include:
• Ten (10) additional progress meetings and workshops;
• Transient modeling and mitigation; and additional effort for:
o Basis of design report and 30% layout drawing additions;
o 60% plans, specifications, and development of Engineers Opinion of Probable Construction Cost (EOPCC) for the Pump Station, chemical feed system and flow control vault;
o 90% plans, specifications, and EOPCC for the Pump Station, chemical feed system and flow control vault;
o Final bidding plans, specifications, and EOPCC;
o Permitting for the chemical feed system; and
o Procurement packaging and submittal reviews.
Details of HDR’s engineering design services amendment are included as Exhibit 1.
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. Previously, expansions to 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. Now, PWSD is in need of its own pump station capacity within the RHWPF and desires to design and construct the deferred WISE infrastructure.
The additional costs associated with this amendment are $228,400; however, $54,780 are related to PWSD’s parallel water line and not the responsibility of the other partners. Thus, Castle Rock’s portion is 54% of $178,620, which equals $93,754.80. The original total cost of the design was $825,600 (Castle Rock’s portion being $445,824). This design amendment represents a 21% cost increase for Castle Rock.
Staff Recommendation
Staff and CRW Commission recommend that Town Council approve the Resolution as presented in 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
Staff Report
Attachment A: Resolution
Exhibit 1: Amended Agreement
Attachment B: Original Agreement