To: Honorable Mayor and Members of Town Council
From: Mark Marlowe, P.E., Director of Castle Rock Water
Title
Resolution Approving a Construction Contract with American West Construction, LLC for the Plum Creek Parkway at Sellars Gulch Bridge Rehabilitation Project [West of Lake Gulch Road and Plum Creek Parkway]
Body
________________________________________________________________________________
Executive Summary
The purpose of this memo is to request Town Council authorization of a Resolution approving an agreement for a construction contract between the Town of Castle Rock and American West Construction LLC, for the Plum Creek Parkway at Sellars Gulch Bridge Rehabilitation Project
(Attachment A). The value of this contract agreement is $387,941, plus a ten percent Town managed contingency in the amount of $38,794, for a total authorization of $426,735. This project was identified under the bi-annual Bridge Inspection Program and is required to prevent damage, and ultimately catastrophic failure, to Plum Creek Parkway at Sellars Gulch. This project rehabilitates the structure by lining three culverts and repairing the deteriorated inverts of the other three culverts. The project is anticipated to extend into the summer of 2017. The project is funded through an Intergovernmental Agreement (IGA) between the State of Colorado Department of Transportation (CDOT) and the Town of Castle Rock, dated December 22, 2015.
Notification and Outreach Efforts
Staff will provide construction notifications to adjacent property owners prior to the start of construction. This project will have minimal impact to traffic on Plum Creek Parkway; however, temporary lane closures may be required during construction. Staff will follow the established notification process for lane closures, should this become necessary.
History of Past Town Council, Boards & Commissions, or Other Discussions
Council authorized Resolution 2015-92, approving an IGA between the Town of Castle Rock and CDOT, for the Plum Creek Parkway at Sellars Gulch Bridge Rehabilitation Project, on November 17, 2015. The IGA provided an 80/20 funding grant for the structure’s rehabilitation. Funding for the project was set at $680,000; with $544,000 in federal funding and a Town local match of $136,000.
This construction contract was presented to the Castle Rock Water Commission on May 24, 2017. The Commission unanimously voted in favor of recommending Town Council approval.
Discussion
This bridge is located on Plum Creek Parkway, between Holmby Court and S. Gilbert Street
(Attachment B). The bridge consists of six metal culvert pipes; one being 12 feet 8-inches" x 11 feet 2-inches elliptical steel plate pipe and the remaining five, each being 90-inch diameter corrugated metal pipes (CMPs). Each end of the bridge (culverts) includes a concrete headwall and wing walls. The bridge was constructed in 1987.
This bridge is inspected every two years under the CDOT Off-System Bridge Inspection Program. The bridge structure sufficiency rating in the 2015 Castle Rock Off-System Bridge Inspection Report, prepared by Stantec, was 12.7 out of a maximum possible rating of 100. This is compared to the bridge structure sufficiency rating of 21.1 in 2011. The bridge inspection report identified the deterioration of the culverts as a primary deficiency requiring repairs and rehabilitation.
The Town advertised, and selected Wilson & Company, Inc. (WCI) to assist in performance of the project design, assist with bidding and provide partial construction phase services. Selection of WCI was based on qualification based selection, with a negotiated scope and fee following selection as required by CDOT. All federally-funded projects are administered according to CDOT and federal procedures, including review and oversight of the consulting engineer selection process, bridge design, and construction oversight.
WCI performed a field inspection and prepared a Final Design Report, which summarized the following:
• Three of the 90-inch diameter corrugated metal pipes were observed to have spot deformities along the length of pipe. The side of the pipe has buckled and the top of the pipe has dropped 10 to 20 inches. It was recommended that the entire length of pipe interior be coated with a two-inch thick centrifugally cast concrete lining to maintain the structural integrity of the pipes and prevent further collapse and/or failure of the existing CMP.
• The remaining three pipes were each observed to have rusted pipe inverts along the length of pipe. It was recommended that concrete inverts be constructed along the entire length of each pipe to mitigate the observed rust.
It is anticipated that the life expectancy of the structure following these repairs will be 20 years +/- with normal maintenance. Improvements are also expected to provide additional capacity needed to convey the 100-year flood event, without roadway overtopping, to reduce long-term flood risk.
Following approval of the Final Design Report by the Town and CDOT, WCI proceeded to prepare adesign, construction plans and contract documents. The construction plans and the contract documents were reviewed by Town staff and CDOT. Following approval of the documents, the project was advertised for public bid from qualified contractors on April 11, 2017 on the Town’s Rocky Mountain Bid Net site. A mandatory pre-bid conference was held on Tuesday, April 18, 2017. Bids were received on May 4, 2017.
Bids were received from two contractors.
• The bid from American West Contractors, LLC, located in Denver, CO, was $387,941.00
• The bid from IPR, located in Pasadena, TX, was $797,317.50.
• The engineer’s estimate for the project was $525,314.00.
Each contractor was determined to be equally qualified to perform the centrifugally cast concrete pipe lining work.
Budget Impact
The Town, as the local agency, will administer the Bridge Rehabilitation Project in accordance with CDOT's procedures, and rules and regulations outlined in the agreement, with oversight and assistance from CDOT. Funding for this project through the IGA totals $680,000; with $544,000 in federal funding (80 percent of the budgeted participating costs), and a Town local match of $136,000. Federal funds are reimbursed to the local agency pursuant to CDOT's stewardship agreement with the Federal Highway Administration (FHWA). CDOT sponsors this grant funding program through the FHWA to provide assistance to local agencies addressing aging bridge infrastructure, thus allowing local agencies to fund other ongoing transportation / stormwater improvements without significant budget implications. These funds help offset capital replacement costs for the Town’s bridge and culvert network.
The Town has established a revenue account in the Castle Rock Water Fund to disburse payments and receive State/Federal funding for this agreement. Expenditures for this construction contract will be drawn from the Castle Rock Water Fund, as shown below with a 2017 budget of $598,552. This project was budgeted in 2016 and funds were carried over to 2017 through the first quarter budget amendment.
|
Project |
Account Number |
Base Contract |
Contingency |
Total Authorization |
|
Expenditure Account - Bridge Improvements Program |
212-4475-444.76-43 |
$387,941 |
$38,794 |
$426,735 |
|
Revenue Reimbursement Account - Capital Grants |
212-4475-331.20-00 |
$310,353 |
$0 |
$310,353* |
|
Total Net Expenditure |
|
$77,588 |
$38,794 |
$116,382 |
*80 Percent of Base Contract
Staff Recommendation
Staff recommends authorization of a Resolution approving the agreement for a construction contract between the Town of Castle Rock and American West Construction, LLC for the Plum Creek Parkway at Sellars Gulch Bridge Rehabilitation Project (Attachment A). The value of this contract agreement is $387,941, plus a Town managed ten percent contingency in the amount of $38,794, for a total authorization of $426,735. The Town will be reimbursed for 80 percent of the contract value ($310,353) through a federal grant.
Proposed Motion
“I move to approve the Resolution as introduced by title.”
Attachments
Attachment A: Resolution
Exhibit 1: Contract
Attachment B: Map