To: Honorable Mayor and Members of Town Council
From: Mark Marlowe, P.E., Utilities Director
Jeanne Stevens, P.E., Engineering Manager
Title
Resolution: Approving a Services Agreement with Burns and McDonnell to complete Design and Bid Phase Services for the Water Infrastructure and Supply Efficiency (WISE) Local Infrastructure Design Project
Body
________________________________________________________________________________
Executive Summary
The WISE project is a key component of our long term water plan. To complete the WISE project, several pieces of local infrastructure are necessary and must be designed and built by 2017. This memo is requesting Town Council approval for design of one of these pieces of local infrastructure.
The Utilities Department is seeking Town Council approval of a resolution (Attachment A) awarding a Services Agreement (Exhibit 1) with Burns & McDonnell for the Water Infrastructure and Supply Efficiency (WISE) Local Infrastructure Design Project. Three bids were received. The low bid was from Burns & McDonnell. The Burns & McDonnell project cost is $263,873. This cost includes design and bid phase services for the potable water distribution system infrastructure needed to convey WISE water from the Parker Water and Sanitation District’s (PWSD) water distribution system to the Town’s existing distribution system. Staff also requests approval for a 10% Town-managed contingency of $26,387, for a total project authorization of $290,260. The scope of services to be completed by Burns & McDonnell is detailed in an attachment to the agreement (Exhibit 1). Burns & McDonnell’s rate and fee schedule is also an attachment to the agreement.
Burns & McDonnell shall undertake the work upon execution of the agreement and shall complete work 24 weeks thereafter. A location map for the proposed potable water transmission pipeline is provided (Attachment B). Funding for this project was budgeted in the 2015 budget line item “WISE Infrastructure” (account no. 211-4375-443-77-72) which has a current balance of approximately $1,320,798. This design cost of $290,260 represents less than 3% of the expected construction costs; for budgeting purposes, we usually plan on 10%. Further, Burns & McDonnell are completing design of five miles of pipeline for less than that of other consultants proposed for the design of 2.1 miles.
History
Utilities staff presented an update of this project as part of the overall Alternate Source of Supply Project Update to the Utilities Commission on July 22, 2015. Presentation to the commission highlighted the recent progress for the hybrid solution. These types of renewable water projects support the Town’s long-term water goal of providing a 75% renewable water supply for the community at build-out.
Discussion
A need for a sustainable, long-term water supply was identified in the Town’s Water Resources Strategic Master Plan (WRSMP). One of the major goals of that plan is to establish a renewable, sustainable water supply that accounts for 75% of the annual demand for water in Castle Rock. Renewable water sources include existing surface water rights along East and West Plum Creek, reusable lawn irrigation and sewered return flows water rights, and imported surface water from outside of the Plum Creek Basin.
The Town plans to import renewable water from various sources through existing and proposed infrastructure outside of the Town’s boundaries. These water sources will consist of renewable water treated to drinking water standards containing chloramines as a residual disinfectant. A near-term source of imported, renewable water will be from the WISE Project. The Town expects WISE water deliveries in early 2017.
The WISE water supplies to be conveyed to the Town beginning in 2017 could total up to 7 million gallons per day (MGD). The Town anticipates northern water supplies to increase up to 16 MGD by 2025. Dominion Water and Sanitation District (Dominion) is planning to partner with the Town on this design project and then also with the future construction project. An Intergovernmental Agreement is being developed between the Town and Dominion to establish a payback to the Town of up to fifty percent of the design services costs. Dominion would need to have a future connection, completed under separate contracts, near the western side of the Town’s water distribution system to convey their WISE water to their development. The Town plans to proceed with this project whether Dominion continues as a partner or not.
Proposals were requested from nine consulting firms specializing in water infrastructure design. Proposals were received from four of these firms in response to the Town’s Request For Proposal (RFP) #2015-02, WISE Local Infrastructure Design. The scope of this RFP included a pipeline design to convey WISE water from Outter Marker Road (in Douglas County) to Crowfoot Valley Road (in Town) near the existing Diamond Ridge Pump Station. The following table lists the total proposal cost received from each of the four consulting firms.
|
Consulting Firm |
Total Cost |
|
Burns & McDonnell |
$141,173 |
|
Providence Infrastructure |
$199,379 |
|
AECOM |
$277,035 |
|
Dewberry |
$279,135 |
During the same period when Utilities was receiving proposals for RFP #2015-02, Utilities was working with AECOM to complete hydraulic modeling services. AECOM evaluated potential water quality and hydraulic impacts to the Town Utilities operations attributed to receiving WISE water being conveyed from the PWSD distribution system. The preliminary planning concept of connecting the WISE water to near Crowfoot Valley Road was compared to connecting the WISE water to the Ray Waterman Regional Water Treatment Center (RWRWTC). In either scenario, the Town plans to acquire a 40’ wide easement along the proposed pipeline corridor. The proposed waterline alignment from Outter Marker Road would follow an existing Xcel Energy corridor in the southeastern direction for most of the distance. The evaluation showed that the proposed hydraulic grade line (includes information such as PWSD tank elevations) from the PWSD system did not work efficiently with the Town connection near Crowfoot Valley Road. The hydraulic conditions of PWSD’s distribution system worked well with the Town’s system when the hydraulic model was completed assuming a WISE water connection made to the RWRWTC.
The RWRWTC has an existing high service pump station that can then distribute WISE water to the two highest pressure zones in Town. From these zones, water can also be distributed to all the lower zones as needed. Utilities staff (with assistance from AECOM) also evaluated near-term and future build-out Capital Improvement Program (CIP) costs associated with the two different WISE water connection points. Future CIP projects will be required to pump and distribute the larger volumes of WISE water and other northern supplies throughout the Town’s distribution system. Connecting the WISE water to the RWRWTC has immediate operational advantages and the potential for future cost savings associated with future CIP projects needed.
With the advantages of connecting to the RWRWTC being identified, Utilities requested that Burns & McDonnell revise their scope of services to include a water pipeline extended approximately 3.1 miles to the RWRWTC. The original pipeline length to be designed by B&McD was 2.0 miles. Their design services will include pipeline sizing, pipeline material selection, routing, flow control and metering, corrosion protection, and other necessary work to complete the pipeline design and bidding phase services. Their revised cost to design the extended pipeline to a connection point at the RWRWTC is $263,873. The additional cost is commensurate with the additional scope of work
|
Consulting Firm |
Design Costs |
|
Burns & McDonnell (initial Proposal cost) |
$141,173 |
|
Additional Scope Cost (to RWRWTC) |
$122,700 |
|
Total Cost |
$263,873 |
Burns & McDonnell specializes in municipal water infrastructure design, bidding and construction phase services. They have successfully completed design through facility start-up services on the Town’s Plum Creek Water Purification Facility (PCWPF) project. On the PCWPF project Burns & McDonnell’s proposal cost was $895,854 compared to the next low cost proposal received in the amount of $1,125,611. Burns & McDonnell completed the PCWPF services within budget. We anticipate Burns & McDonnell will deliver the same excellent value and engineering services when completing the proposed WISE Local Infrastructure Design project.
Budget Impact
Utilities budgeted $2,304,734 (Water Resources Capital Projects account 211-4375-443-77-72 WISE Infrastructure; project code WRCRDI) in 2015 for infrastructure projects associated with developing and conveying WISE water to the Town, and $1,320,798 is still available. Burns & McDonnell’s cost is $263,873. Staff requests an additional $26,387 (Town-managed 10% contingency) be authorized for a total project authorization of $290,260.
Staff Recommendation
Staff recommends Town Council approval of the resolution approving the Services Agreement for the WISE Local Infrastructure Design Project with Burns & McDonnell Engineering, Company, Inc. in the amount of $263,873 (Attachment A).
Attachments
Attachment A: Resolution
Exhibit 1: Agreement
Attachment B: Location Map