To: Honorable Mayor and Members of Town Council
From: Mark Marlowe, P.E., Director of Castle Rock Water
Jeanne Stevens, P.E., Engineering Manager
Title
Resolution Approving a Design Consultant Agreement with Burns & McDonnell Engineering Company, Inc. for the Plum Creek Water Purification Facility Advanced Treatment Project [1929 Liggett Road]
Body
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Executive Summary
Castle Rock Water is seeking Town Council approval of a Resolution (Attachment A) awarding a Design Consultant Agreement (Exhibit 1) with Burns & McDonnell Engineering Company, Inc. (B&McD), for the Plum Creek Water Purification Facility (PCWPF) Advanced Treatment Project. A project location map is provided (Attachment B). A competitive process was used to obtain proposals from qualified consulting firms. B&McD’s proposal met the qualitative requirements and their total design services fee was the lowest cost at $1,455,320. Given the scope of the design project, staff believes the proposed fee is competitive and reasonable. Town staff requests approval of an additional $72,766 (five percent contingency) for additional services that may be needed during design. These additional services could include responding to unanticipated changes encountered during design.
Seven consulting firms were invited to submit proposals in response to the Request for Proposals (RFP) dated September 22, 2017. The design services require full time commitment of the firm’s core project team to complete these services within the project schedule. Five of the firms decided not to submit proposals and either did not have the available resources to commit to this project or have not been competitive on past Castle Rock Water projects.
B&McD is a nationally recognized engineering firm with offices located in Douglas County. They have recent experience completing projects using similar treatment technologies and project delivery methods that are planned for the PCWPF Advanced Treatment Project. It is also important to note B&McD designed and oversaw construction of the current PCWPF, giving them intimate knowledge of the existing facility. This project will employ a Guaranteed Maximum Price Construction Management (GMPCM) delivery method to complete the project. Prior experience with similar projects and alternate project delivery methods is a critical criterion in the consultant selection process and B&McD has the requisite experience.
History of Past Town Council, Boards & Commissions, or Other Discussions
Castle Rock Water staff presented the specifics of this project to the Castle Rock Water Commission at their special meeting held on November 15, 2017. The presentation highlighted the scope and complexity of this capital improvement project. These types of renewable water projects support the Town’s long-term water goal of providing a 75 percent renewable water supply for the community at build-out. The Commission unanimously approved the recommendation that Town Council approve a Resolution to award a Design Consultant Agreement with B&McD for the PCWPF Advanced Treatment Project.
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 percent of the annual demand for water in Castle Rock. Renewable water sources include East and West Plum Creek alluvial wells, surface water using existing Town Water Rights, and imported surface water from outside of the Plum Creek Basin.
The PCWPF Advanced Treatment Project consists of treating collected renewable surface water sources from East Plum Creek (EPC). Changes in raw water quality and quantity to the PCWPF are anticipated from the new source waters. Castle Rock Water is currently evaluating different locations downstream from the Plum Creek Water Reclamation Authority as the new source of supply. A pump station, pipeline and other facilities required to convey new source water to the PCPWF will be completed under separate contract and are not included with these design services.
The six million gallons per day (MGD) capacity pretreatment facilities at the existing PCWPF includes aeration, rapid mix, flocculation, sedimentation, and greensand filtration. The greensand filtration is followed by membrane filtration and chemical addition to form chloramines for a disinfection residual in the distribution system. Other facilities constructed with the original PCWPF include a 174,000 gallon clearwell, high service pump station, chemical storage, and feed systems.
The PCWPF Advanced Treatment Project components will be designed to match the current facility water treatment capacity of 6 MGD, and be expandable to 12 MGD with a future expansion project. A Basis of Design Report (BDR) was completed by CH2M Hill (dated September 7, 2017) for the PCWPF Advanced Treatment Project. The BDR identified a potential multiple barrier treatment approach including pre-ozone, biologically active carbon filtration, ozone disinfection, granular activated carbon absorption, and UV disinfection. The multiple barrier approach will be designed to treat the new source water for removal of pathogens, organics, regulated drinking water contaminants, and non-regulated contaminants of emerging concern (CECs). The primary goal of the PCWPF Advanced Treatment Project is to meet or exceed requirements of the United States Environmental Protection Agency Safe Drinking Water Act, as well as additional requirements from the Colorado Department of Public Health and Environment (CDPHE).
More specifically, the PCWPF Advanced Treatment Project includes a new one million gallon raw water blending tank, an ozone system for advanced oxidation, a biologically activated carbon (BAC) filter conversion, granular activated carbon contactors, an ultraviolet disinfection system, and a new 1,250 kW diesel powered generator. This Advanced Treatment Project will not be adding treatment capacity to the PCWPF. The proposed advanced treatment systems will be designed with treatment capacities equal to the current overall facility treatment capacity of 6 MGD. The consultant’s scope also includes stormwater design, site survey and geotechnical services that are necessary for site evaluation and final project design.
The PCWPF Advanced Treatment Project design services will include pilot testing services and facilities design for onsite handling of solids generated at the PCWPF. The consultant shall evaluate different sludge handling technologies and assist Castle Rock Water in selecting a preferred technology (based on, but not limited to, capital cost and operating and maintenance costs). The onsite solids handling system is to be sized for the PCWPF operating at 6 MGD, but the solids handling system shall be expandable to handle the PCWPF operating at 12 MGD.
Proposed Work Package Zero would expedite design and construction of the one million gallon raw water blending tank. Work Package One (WP1) will include tie-ins with existing raw water piping, conversion of the greensand filter to BAC filtration, new under-slab piping, and foundation work for WP2 facility. Work Package Two (WP2) will include remaining work needed to complete the facility. It is Castle Rock Water’s intent to use the new blending water tank and BAC filtration for demand season 2019, should the Town need additional water available from an East Plum Creek diversion. In any event, the blending tank is to be online as soon as possible to help minimize sand from flowing into the current treatment system. Additional advanced treatment components such as ozone, UV, and GAC may not be ready for the 2019 demand season and will be completed at a later date (in accordance with to be developed project schedules).
Now that the BDR is complete, the next step is to prepare a detailed design for construction of the PCWPF Advanced Treatment Project. Therefore, Castle Rock Water issued a RFP on September 22, 2017 and requested proposals from seven qualified consulting firms. Two of those seven consultants responded and submitted proposals on October 17, 2017. Staff evaluated proposals received from consulting firms, first from a qualitative perspective before opening the corresponding fee schedules. Both proposals were well prepared and adequately addressed all of the requirements in the RFP. The fees proposed by each firm were then reviewed to ensure that adequate resources were applied to the project. Finally, each of the two firms was invited to interview with some of Castle Rock Water engineering staff to answer questions related to their proposals. Based on this process, staff recommends awarding the design contract to B&McD.
B&McD has a proven track record of completing similar projects in Colorado and, in particular, along the Front Range. B&McD also proposed two design alternatives to improve construction efficiencies (saving time and money) and to lower initial project capital and long-term operation and maintenance (O&M) costs. The first design alternate proposes a Work Package Zero to expedite design and construction of the one million gallon raw water blending tank. Construction of a post-tensioned concrete tank requires contractors who specialize in this type of construction. The new building concrete foundation work will most likely be a different contractor. Expediting the tank construction will help ensure that these two contractors are on-site at different times and not create work zone conflicts between each other. The second alternative proposes adding design services to revisit the advanced treatment processes established in the BDR. B&McD notes benefits with these added services, such as reduced capital and O&M costs potentially saving millions of dollars. This step will require coordination with and buy-in from Town staff and Colorado Department of Public Health and Environment (CDPHE). B&McD anticipates that PCWPF purified water quality resulting from changes they may propose would meet or exceed the same treatment quality as processes established in the BDR. Staff recommends including these two alternative design steps with the overall B&McD scope. B&McD is the low cost proposal with these two alternatives added to the scope.
B&McD submitted a proposal with the lowest fee. Below is a list of the two firms who submitted proposals and their associated fees.
|
Consulting Firm |
Total Cost |
|
Burns & McDonnell - Base Fee |
$1,370,618 |
|
• Work Package Zero |
$26,878 |
|
• Additional Front End Planning |
$57,824 |
|
Total B&McD |
$1,455,320 |
|
|
|
|
Hazen & Sawyer - Base Fee |
$1,491,610 |
|
(No alternatives proposed) |
|
The Town envisions retaining a contractor through a Guaranteed Maximum Price Construction Management (GMPCM) contract at the completion of the schematic design phase (thirty percent design documents) for three Work Packages. The contractor shall provide pre-construction phase services, including but not limited to: cost estimating, scheduling, constructability reviews, and value engineering, all with the intent of developing a Final Guaranteed Maximum Price (FGMP) contract. The design consultant will be asked to assist the Town in the contractor selection process and provide coordination with the contractor throughout the design phase to assure that the FGMP based on completed design documents is within the Town’s estimated budget.
Budget Impact
Funding for this project was budgeted in the 2017 budget line item “Advanced Oxidation Facility” (account no. 211-4375-443.77-75), with additional funding budgeted in 2018 and 2019.
Staff Recommendation
Staff recommends Town Council approval of the Resolution (Attachment A) approving the Design Consultant Agreement (Exhibit 1) for the Plum Creek Water Purification Facility Advanced Treatment Project with Burns & McDonnell Engineering Company, Inc. in the amount of $1,455,320. Town staff requests approval of an additional $72,766 (five percent contingency), for a total project authorization of $1,528,086.
Proposed Motion
“I move to approve the Resolution as introduced by title.”
Attachments
Attachment A: Resolution
Exhibit 1: Agreement
Attachment B: Map