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 AECOM Technical Services, Inc. for the 6400 South Tributary Stabilization Project
Body
________________________________________________________________________________
Executive Summary
Castle Rock Water is seeking Town Council approval of a Resolution (Attachment A) awarding a Services Agreement (Exhibit 1) with AECOM Technical Services, Inc. for the 6400 South Tributary Stabilization Project in the amount of $309,855 plus a town managed 10% contingency in the amount of $30,986 for a total authorization in the amount of $340,841. The scope of work generally includes engineering design, surveying, hydraulic modeling, permitting, subsurface utility engineering and geotechnical services for stream stabilization including restorative grade control structures, bank protection and channel grading in the Meadows Subdivision near Castle View High School and the new Arapahoe Community College Campus (see Attachment B). Services under this agreement are anticipated to be completed by June 2021, with construction of the project scheduled for August 2021 through May 2022. The total project budget and remaining available funds for construction are provided below:
|
|
Design Services |
Bid/ Const. Services |
Construction |
Project Total |
|
Project Budget |
$340,000 |
$110,000 |
$1,750,000 |
$2,200,000 |
This project is part of a broader effort to address legacy Stormwater needs in the Town. Castle Rock Water has closed on a $9.5M bank loan to address some of these legacy Stormwater needs.
Notification and Outreach Efforts
The project is located in the Meadows Subdivision near Castle View High School and the new Arapahoe Community College Campus, extending from East Plum Creek upstream to Meadows Boulevard. Improvements will be constructed within Town owned right-of-way / easements, on land currently owned by the Castle Rock Development Company and within Union Pacific Railroad right-of-way. Easements will be needed from the Castle Rock Development Company.
Town staff will provide outreach to stakeholders through notification letters and design review meetings as needed throughout the design process. Project details and updates will also be provided on the Town website, CRgov.com.
History of Past Town Council, Boards & Commissions, or Other Discussions
Castle Rock Water staff presented this construction contract to the Castle Rock Water Commission at their meeting held on December 11, 2019, and the Castle Rock Water Commission voted unanimously to recommend approval of the resolution by Town Council.
Discussion
The 6400 South Tributary Stabilization Project includes restorative grade control structures, bank protection and channel grading to restore approximately 5,000 linear feet of channel to a healthy and safe stream corridor that protects property, infrastructure and the public consistent with the recommendations outlined in the 6400 East, West & South Tributaries Major Drainageway Master Plan, dated September 2010.
6400 South Tributary is a western tributary to East Plum Creek, extending along the western edge of the Town. The entire 6400 South Tributary channel is approximately 1.0 miles long from the headwaters to the confluence with East Plum Creek, and the 6400 East, West & South Tributaries together encompass a drainage area of approximately 4.5 square miles. The current condition of the 6400 South Tributary channel within the project limits has been impacted by recent development / urbanization. Increased runoff has led to incisions extending through the silty/sandy material laterally creating larger meanders and adversely impacting existing trails, infrastructure and stream banks. This project provides a tangible benefit to water quality in the watershed and for Castle Rock Water with our diversion in Sedalia as well as other downstream water supply users.
The Town issued a Request for Proposals (RFP), and five (5) proposals were received. The proposals were reviewed and ranked based on a weighted set of criteria included in the RFP document. Following the qualification-based selection process, the fee schedule for each firm was opened and reviewed, “not for low bid, but for a reasonable and appropriate level of effort from each team member.” The five fee schedules ranged from $270,910 to $445,643. The top ranked firm from this selection process was AECOM Technical Services, Inc. with a proposed fee of $309,855. Their proposal and fee combination represented the best value for the Town overall in terms of project approach and understanding, technical expertise, scope of services provided and price. AECOM brings with them previous experience with the Town, completing 2,500 lineal feet of channel stabilization on the 6400 West Tributary in 2011/2012.
Budget Impact
Funds for this Services Agreement will be charged to the Stormwater capital account below. Funds for this project were not included in the 2020 budget; however, 6400 South Tributary has been identified as a Legacy Project to be funded through the Stormwater bank loan. Appropriation of the required funds will be accounted for in the first quarter budget amendment.
|
Fund Description |
Account Number |
Amount |
Contingency |
Total |
|
6400 S. Trib Stbl Phs II |
212-4475-444.77-28 |
$309,855 |
$30,986 |
$340,841 |
Staff Recommendation
Staff recommends Town Council approval of a Resolution awarding the Services Agreement with AECOM Technical Services, Inc. for the 6400 South Tributary Stabilization Project at a cost of $309,855 plus a town-managed 10% contingency in the amount of $30,986 for a total authorization in the amount of $340,841.
Proposed Motion
“I move to approve the Resolution as introduced by title.”
Attachments
Attachment A: Resolution
Exhibit 1: Services Agreement
Attachment B: Project Site Map