To: Honorable Mayor and Members of Town Council
From: Mark Marlowe, P.E., Director of Castle Rock Water
Title
Resolution Approving the Town of Castle Rock Services Agreement with Burns & McDonnell Engineering Company, Inc. for Construction Phase Engineering Services for the Plum Creek Water Purification Facility Advanced Treatment Project [1929 Liggett Rd.]
Body
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Executive Summary
Castle Rock Water is seeking Town Council approval of a Resolution (Attachment A) awarding a Services Agreement (Exhibit 1) to Burns & McDonnell Engineering Company, Inc. (B&McD), for the Plum Creek Water Purification Facility (PCWPF) Advanced Treatment Construction Phase Engineering Services. B&McD was retained as the design consultant for this project through a competitive process, and they have prepared plans and specifications for construction of this facility. As engineering consultant for the project, they have direct knowledge and experience with the specialized components designed for this project. Their continued support during construction is important to maximize value and to ensure a quality-constructed facility built in accordance with facility plans and specifications.
At the request of Castle Rock Water, Burns & McDonnell submitted a proposal to provide engineering services during construction and startup. These services include attending weekly progress meetings, daily construction inspection, reviewing submittals, responding to requests for information from the contractor, reviewing project records, providing start-up assistance with operator training, and preparing record drawings. Staff recommends approval of the services agreement for a not-to-exceed amount of $1,340,115 to retain B&McD for construction phase engineering services for the PCWPF Advanced Treatment Project.
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 scheduled meeting held on November 28, 2018. 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 by 2050. The Commission voted to recommend that Town Council approve a Resolution to award a Construction Phase Engineering Services Agreement to B&McD for the PCWPF Advanced Treatment Design 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 by 2050. Renewable water sources include alluvial wells, surface water using existing Town water rights, and imported surface water from outside of the Plum Creek Basin. This project will add reusable water sources to the source supply for the Town.
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 reusable source waters. Castle Rock Water is planning to pump surface water from the Town-owned Castle Rock Reservoir in Sedalia to the PCWPF. This reservoir is a new reusable source of supply and is located downstream from the Plum Creek Water Reclamation Authority. A pump station, pipeline and other facilities required to convey the new reusable source water to the PCPWF will be completed under separate contract and are not included with these construction phase services.
The six million gallons per day (MGD) capacity pretreatment facilities at the existing PCWPF include aeration, rapid mix, flocculation, sedimentation, and greensand filtration. The greensand filtration is followed by membrane filtration and primary disinfection by chlorine, with secondary disinfection achieved by adding ammonia to form chloramines for a more effective residual disinfectant in the distribution system.
Town Council authorized award of a design services agreement to B&McD in December 2017 for a not to exceed amount of $1,528,086. Since that time, the PCWPF Advanced Treatment Project components have been designed to match the current facility water treatment capacity of six MGD, and will be expandable to twelve MGD with a future expansion project. B&McD (with Castle Rock Water direction) has followed a multiple barrier treatment approach design as recommended by a Basis of Design Report (BDR) completed by CH2M Hill (dated September 7, 2017) for the PCWPF Advanced Treatment Project. The multiple barrier treatment approach includes pre-ozone, biologically active carbon filtration, ozone disinfection, granular activated carbon adsorption, and UV disinfection. This multiple barrier design will treat the new reuse source water for removal of pathogens, organics, regulated drinking water contaminants, and nonregulated contaminants of emerging concern (CECs). The primary goals of the PCWPF Advanced Treatment Project are to meet or exceed requirements of the US EPA Safe Drinking Water Act, additional requirements from the Colorado Department of Public Health and Environment (CDPHE), and purify the water removing currently unregulated contaminants.
In general, construction of 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, onsite solids handling equipment, and a new diesel powered generator for emergency electrical power.
In order to deliver a quality-constructed project and maximize value, Castle Rock Water recommends retaining Burns & McDonnell for construction phase engineering services. At the request of staff, Burns & McDonnell submitted a proposal to provide these services. The scope of work and fee are included as exhibits to the agreement (Exhibit 1).
The B&McD fee for construction phase engineering services is $1,340,115. This fee is approximately 4.8 percent of estimated construction costs ($26,912,068). The proposed B&McD fee is fair and reasonable, and considering the highly technical nature of the water treatment systems to be installed, sole-sourcing these services with the design consultant will help ensure that the project is constructed in compliance with plans and specifications. In addition, Burns & McDonnell is familiar with the Guaranteed Maximum Price Construction Management (GMPCM) project delivery method. B&McD has worked with the contractor to revise designs as needed to fit the budget and scope, and their continued involvement is critical to maintaining the existing relationship that has developed between the owner, design consultant and contractor. Therefore, a sole source contract is recommended. A sole source justification form is included (Attachment B).
Budget Impact
Funding for this project was budgeted in the 2018 budget line item “Advanced Oxidation Facility” (account no. 211-4375-443.77-75), with additional funding budgeted in 2019.
Staff Recommendation
Staff recommends Town Council approval of the Resolution (Attachment A) approving the Construction Phase Engineering Services Agreement for the PCWPF Advanced Treatment Design Project with Burns and McDonnell in the amount of $1,340,115.
Proposed Motion
“I move to approve the Resolution as introduced by title.”
Attachments
Attachment A: Resolution
Exhibit 1: Agreement
Attachment B: Sole Source