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File #: RES 2019-129    Version: 1 Name:
Type: Resolution Status: Passed
File created: 9/17/2019 In control: Town Council
On agenda: 12/17/2019 Final action: 12/17/2019
Title: Resolution Approving a Construction Contract with Insituform Technologies, LLC for the 2019 Cured-in-Place Pipe Sewer Project
Attachments: 1. Attachment A: Reso 2019 Cured in Place Pipe project, 2. Exhibit 1: Insituform2019CIPP_ConstructionContractDraft, 3. Attachment B: Map 2019 CIPP Project Area, 4. Presentation

To:                     Honorable Mayor and Members of Town Council


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


Resolution Approving a Construction Contract with Insituform Technologies, LLC for the 2019 Cured-in-Place Pipe Sewer Project





Executive Summary


Castle Rock Water is seeking Town Council approval of a construction contract (Attachment A) with Insituform Technologies, LLC (Insituform) in the amount of $300,962.60 and authorization of 10% contingency ($30,000) for a total authorization of $330,962.60 for the 2019 Cured-in-Place-Pipe (CIPP) Sewer Project.  The 2019 CIPP Project includes rehabilitation of more than two miles of existing clay sewer pipe near the Memmen Young neighborhood of town (see Attachment B for a project map).   The proposed schedule is to start in January 2020 and complete the project by April 2020.  CIPP is a method to rehabilitate existing sewer pipe in place, without costly street cuts and pavement repairs. Based on a history of root intrusion, increased annual maintenance and identified pipe defects in the Memmen Young neighborhood, this area has been the target of focused pipe rehabilitation.  CIPP lining of the sewer system through the neighborhood should result in an overall rehabilitated sewer pipe system with a significantly increased lifespan.


Every year the Water Department conducts sewer cleaning and video inspection as part of annual operations and maintenance.  As a result of the video inspection, system deficiencies are identified, such as cracked, broken or deformed pipe and offset joints. The sewer rehabilitation program is designed to rehabilitate, repair or replace sewer system components throughout the Town that have reached or are nearing the end of their useful life.  Consistent with the Town’s current Wastewater Master Plan, the Sewer Line Rehab Program budgeted $350,000 for 2019, and funding is provided through revenues associated with sewer rates. 



Notification and Outreach Efforts


Once an agreement is authorized, a notice and map of the project will be prepared for the Town’s website, and a targeted mailing will be sent to the 151 residential units in the neighborhood advising them of the upcoming project and what to expect. The contractor will be required to provide separate notification on individual streets to residents as the work progresses.  There will be short-term disruptions to wastewater service as a crew works on a particular sewer main, and residents will be advised to discontinue inside water use during that time.  Work will typically be performed Monday through Friday from 7:00 am to 7:00 pm in accordance with Town Municipal Code.  It is unlikely that street closures will be required, but traffic control plans, coordinated through public works, will be in place to protect the public and work crews and to manage traffic.  Residents will be advised to contact the Project Manager with any concerns or questions.



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


Castle Rock Water Commission was provided an update at the December 11, 2019 meeting and the Commission unanimously supports its adoption by Town Council.





The Town has over 271 miles of sanitary sewer lines, ranging in size from 4” to 54”, some of which date back to the 1930s.  Much of the Town’s older sewer pipes are clay pipe (approximately 17 miles) that are more susceptible to root intrusion than modern-era polyvinyl chloride (PVC) pipe.  Problem areas that have cracked and deteriorating pipe and significant root intrusion problems require annual root-cutting and cleaning.  The roots tend to exacerbate and accelerate the pipe deterioration by growing through cracks and then expanding the cracks to a point of pipe failure.  Roots can totally block the pipe, resulting in sewer backups, sometimes into basements.  The service life of clay pipe can be extended many years by the method of cured-in-place pipe (CIPP) lining, which has a minimum expected life of 50-75 years.  The lining effectively seals joints and is a very effective deterrent to root intrusion.  Insitu rehabilitation now by the installation of a cured in place liner, before the pipe deteriorates to a failed condition that might require a street-cut to repair, is more cost effective, can be completed with minimal disruption to service and results in less future maintenance.  CIPP lining is also effective at reducing infiltration of groundwater through joints in the sewer pipe.  The Town has previously lined approximately 7 miles of clay sewer pipe and there are roughly 10 miles of unlined clay sewer pipe in the system.


A request for proposals including project specifications for the 2019 CIPP Project was publicly advertised in November on the Rocky Mountain E-Purchasing System.  Interested contractors submitted proposals describing their qualifications and experience with performing the various tasks that could be anticipated as part of the project and provided information to demonstrate that their intended product would meet the project technical specifications.  Proposals were received from two qualified contractors.  The bids for the proposed scope of work are summarized below, along with the engineer’s estimate.  Insituform was the lowest bidder and has successfully completed CIPP projects for the Town before.


Bid Amount

Engineer’s Estimate


Insituform Technologies, LLC.


Granite Inliner, LLC.




Budget Impact


The agreement and contingency allocate $330,962.60 from the 2019 Sewer Line Rehab account as shown below. 



Account Number

2019 Budget

2019 CIPP Authorization

Sewer Line Rehab






Staff Recommendation


Staff requests Council approval of a Resolution approving a construction contract in the amount of $300,962.60 with Insituform Technologies LLC and authorization of an additional $30,000 in contingency for the 2019 CIPP Project.


Proposed Motion


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




Attachment A:                      Resolution

Exhibit 1: Construction Contract for 2019 CIPP Project between Town of Castle Rock and Insituform Technologies, LLC.

Attachment B: Map of 2019 CIPP Project Area