Castle Rock Banner
Share to Facebook Share to Twitter Bookmark and Share
File #: RES 2020-008    Version: 1 Name:
Type: Resolution Status: Passed
File created: 12/10/2019 In control: Town Council
On agenda: 1/7/2020 Final action: 1/7/2020
Title: Resolution Approving a Services Agreement With Olsson, Inc. for the East Plum Creek Reach 5 Phase II Stabilization Project
Attachments: 1. Attachment A: Resolution, 2. Exhibit 1: Services Agreement, 3. Attachment B: Site Map, 4. Presentation

To:                     Honorable Mayor and Members of Town Council


From:                     Mark Marlowe, P.E., Director of Castle Rock Water



Resolution Approving a Services Agreement With Olsson, Inc. for the East Plum Creek Reach 5 Phase II Stabilization Project 




Executive Summary


Castle Rock Water is seeking Town Council approval of a Resolution (Attachment A) awarding a Services Agreement (Exhibit 1) to Olsson, Inc. for the East Plum Creek (EPC) Reach 5 Phase II Stabilization Project in the amount of $261,284, plus a 10% Town-managed contingency in the amount of $26,128 for a total project authorization of $287,412.  This project is funded through the Stormwater, Water Resources and Wastewater Enterprises and is located near the Plum Creek Water Purification Facility (PCWPF) and the Town’s Central Service Center. The scope of work generally includes survey, alternative analysis, preliminary and final design, environmental permitting and FEMA Conditional Letter of Map Revision (CLOMR) approval for stream stabilization improvements.  Channel stabilization is key for long-term protection of critical water and sewer infrastructure.  Reach 5 Phase II is generally located east of I-25 approximately 800’ downstream of the existing pedestrian crossing to the Town limits approximately 700’ upstream of the crossing (Attachment B).  Engineering services are anticipated to be complete by December 31, 2020; however, federal permitting is not expected to be obtained until 2021. 


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 within Town owned open space. Staff will provide notifications via direct mailings to adjacent property owners, news releases and social media postings, as needed. Project details and updates will be provided on


History of Past Town Council, Boards & Commissions, or Other Discussions


This project was identified in the East Plum Creek Watershed Master Plan Preliminary Design Report (Master Plan), adopted by Council through Resolution No. 2009-03 on January 6, 2009.


Castle Rock Water staff presented this design services 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.




The Town has multiple objectives to be achieved through channel stabilization along Reach 5 of EPC that include but are not limited to:


                     Preserve and enhance the riparian and wetland corridor by incorporating more natural designs and features where possible that complement the natural and geological environment.

                     Reduce channel slope and erosive velocities to restore a sustainable channel system for water quality and flood control.

                     Protect existing infrastructure, including the CR-1 Diversion, sanitary sewer interceptor, EPC trail and adjacent property, by reducing channel erosion and migration during flood events.

                     Restore original design grade above sanitary sewer interceptor, to the extent practicable.

                     Minimize magnitude of construction impacts by protecting existing trees and vegetation where possible.

                     Identify opportunities for permanent maintenance access from the existing trail to proposed channel improvements that fits the existing and constructed riparian corridor.

                     Secure federal approvals for floodplain, endangered species and wetland impacts in a cost effective manor while ensuring environmental compliance and reducing public hazards.

                     Incorporate additional stakeholder input as warranted and allowable by budget.


Specific objectives to be achieved through channel stabilization at the CR-1 Diversion include, but are not limited to:

                     Armor and protect structure to prevent undermining and channel migration away from screened section; prevent catastrophic failure, to the extent practicable.   

                     Direct flows over screened section to optimize water intake.

                     Minimize sediment deposition on screened section.


Due to the length of Reach 5, stabilization will occur in multiple phases.  Reach 5 Phase III and IV project limits are generally between Meadows Parkway and North Meadows Drive.  Additional Reach 5 project phases are also planned between Meadows Parkway and Wolfensberger Road. 


This project will be split into three major design phases including: I) project survey, site investigation and alternatives analysis, II) preliminary design, and III) final project design.


The Town issued a Request for Proposals (RFP) via Rocky Mountain BidNet, and four (4) responses were received.  A selection committee reviewed and ranked each proposal 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 four fee schedules ranged from $206,437 to $294,056.  Overall, the top ranked firm in terms of qualifications, response to scope of work, understanding of project, team experience, and fee was Olsson, whose proposal represented the best overall value for the services requested. 


Budget Impact


Funds for this services agreement will be charged to the Stormwater, Water Resources and Wastewater accounts below.  Total project costs, including contingency, are $287,412.       



Account Number





SW - EPC Stream Stabilization





$172,447 1st Qrt Budget Amendment

WR - CR-1 Diversion






WW - Sewer Line Rehab












Stormwater funds for this project were not included in the 2020 budget; however, East Plum Creek 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.  The Water Resources and Wastewater amounts will be funded through available 2020 budget.


The total multi-year expenditures for this project are as follows:


Engineering & Permitting

Bid & Const Support Estimate

Construction  Estimate

Total Estimate

$ 261,284

$ 60,000

    $ 2,500,000 *

$ 2,821,284 *

* Costs subject to change based on selected alternative.


Staff Recommendation


Staff recommends Town Council approval of a Resolution awarding a Services Agreement to Olsson, Inc. for the East Plum Creek Reach 5 Phase II Stabilization Project in the amount of $261,284, plus a 10% Town-managed contingency in the amount of $26,128, for a total project authorization of $287,412. 


Proposed Motion


“I move to approve the Resolution as introduced by title.”




Attachment A: Resolution

Exhibit 1: Services Agreement

Attachment B: Site Map