To: Members of the Castle Rock Water Commission
From: Mark Marlowe, P.E., Director of Castle Rock Water
Roy Gallea, Engineering Manager
Matt Hayes, CIP Project Manager
Title
Resolution Approving a Construction Contract Between the Town of Castle Rock and Global Underground Corporation for the Glovers Water Rehabilitation Project Phase 2 [Glovers Subdivision, Ash Ave., Birch Ave., and Cedar Ave.]
Town Council Agenda Date: March 1, 2022
Body
________________________________________________________________________________
Executive Summary
Castle Rock Water is seeking Town Council approval of a resolution approving a construction contract (Attachment A) with Global Underground Corporation (Global) for the Glovers Water Rehabilitation Project Phase 2. This project will replace all of the water mains and sewer laterals in the Glovers neighborhood (Attachment B). Phase 1 was completed in 2021 and replaced the mains and sewer laterals and reconstructed the roads in the southern portion of the neighborhood. Phase 2 will replace the water mains and sewer lateral and reconstruct the roads in the remainder of the subdivision. The sewer mains in Glovers have been rehabilitated with Cured in Place Pipe (CIPP lining) that was completed in 2013. Global submitted the lowest responsive bid for a total construction cost of $2,957,405.57. Staff also requests approval for a 10% Town-managed contingency of $295,740, for a total project authorization of $3,253,145.57.
Notification and Outreach Efforts
CR Water sent a notice of construction letter to the residents of the entire subdivision during the first phase of the project. CR Water will send out a notice of construction letter to residents for phase 2. The project update is posted on the department’s webpage and periodic project updates will be sent to the residents.
Discussion
The Glovers Water Rehabilitation Project is located east of S. Gilbert Street, between Ash Avenue and Elm Avenue. This project will replace the aging and undersized potable water distribution piping in this subdivision. There is a total of 10,544 linear feet of old 6” cast iron pipe that was installed in 1976. This subdivision has had a significant number of main breaks in recent years - 17 dating back to 2009, but with increasing frequency in the last few years. There have been approximately two to three main breaks per year for the past four years, and one already this year. Based on our experience and industry standard practice, these pipelines have reached the end of their useful life. Repair costs will continue to increase if the pipes are not replaced. Repair costs average approximately $5,000 each, but that does not factor in the inconvenience to the residents or the time it takes our crews away from performing preventive maintenance/other tasks on other parts of the water distribution system.
There are just over 8 miles of old cast iron pipe (CIP) still active throughout Town, including the almost two miles in the Glovers neighborhood. Almost all of the cast iron pipe is 6 inches in diameter (6.33 miles), and most was installed in the period from 1966 to 1986. Less than a half-mile of cast-iron pipe of any size has been installed since 1995. With a practical life expectancy of 50 years, most of the CIP is reaching the end of its useful life. For planning purposes, $750,000 to $1,000,000 per linear mile is a reasonable cost estimate for replacement given that all of the pipe is in residential areas and under roadways. Roadway restoration is a significant portion of the overall cost to replace. Priority is given to replacing pipe in areas with a history of line breaks, where significant roadway improvement will take place, and/or where fire flow issues are a concern. Emphasis is also placed on the criticality of failure. For example, a pipe that fails under a bridge or railroad could have catastrophic consequences. A failure in a critical area such as a hospital could have significant consequences for life safety. The tables below show a summary of active cast-iron pipe in Town, by age and size. Current funding for the next five years for waterline rehab averages $880,000 per year.
|
Year Installed |
Miles |
Age |
|
before 1966 |
0.55 |
55+ |
|
1966 - 1975 |
2.87 |
45-55 |
|
1976-1985 |
4.14 |
35-45 |
|
1986-1995 |
0.21 |
25-35 |
|
post 1995 |
0.49 |
25+ |
|
|
8.3 |
|
|
|
|
|
|
Size, inches, diam. |
Miles |
|
4 |
0.9 |
|
6 |
6.3 |
|
8 |
0.4 |
|
12 |
0.6 |
|
|
8.3 |
Glovers Phase 1 was completed in 2021 by T. Lowell Construction. Phase 1 replaced all of the water mains in the southern portion of the subdivision which included Elm Ave., Douglas Fir Ave, Hill Drive, and Park Drive. During the construction of the water mains, the existing asphalt failed since the it was only 3 inches thick in most areas. The existing road could not be patched due to the failing asphalt. A change order was approved by Town Council in July of 2021 to add the sanitary laterals replacement and road reconstruction to Phase 1 of the project. We have incorporated the sanitary laterals replacement and road reconstruction into Phase 2 of the project.
Budget Impact
The request for bids for the project was sent to six qualified contractors. Contractors are pre-qualified for projects annually through a request for qualifications that is advertised on BidNet. Bids were received from three contractors, as summarized in the table below. The Engineer’s estimate was $4,412,193. The low bid was received from Global and is considered a responsive bid.
|
Consultant |
Bid Amount |
|
Global Underground |
$2,957,405.57 |
|
ESI |
$3,342,357.00 |
|
T. Lowell |
$3,920,000.00 |
|
C&L |
No Bid |
|
53 Corporation |
No Bid |
|
Iron Woman |
No Bid |
Sufficient funding for this project is available in the approved 2022 Budget following a first quarter budget amendment. The project will be funded from the Glovers Waterline Replacement Account (Account No. 210-4275-442-78-24), Sewer Rehab Account (Account No. 213-4575-445-78-78), and Public Works Account No. 120-3175-431-40-35. Global’s bid is $2,957,405.57. Staff requests an additional $295,740 (Town-managed 10% contingency) be authorized for a total project authorization of $3,253,145.57.
Project Account Amount Contingency Total
210-4275-442-78-24 $1,957,829.76 $195,783.00 $2,153,612.76
213-4575-445-78-78 $434,591.18 $43,459.00 $478,050.18
120-3175-431-40-35 $564,984.63 $56,498.00 $621,482.63
Staff Recommendation
Staff recommends Town Council approval of the resolution approving the construction contract between the Town of Castle Rock and Global Underground Corp. for the construction for the Glovers Water Rehabilitation Project Phase 2 in the amount of $2,957,405.57 plus a 10% Town-managed contingency of $295,740 for a total authorization of $3,253,145.57.
Proposed Motion
“I move to recommend to Town Council approval of the Resolution as presented”
Attachments
Attachment A: Resolution
Exhibit 1: Agreement
Attachment B: Project Map with History of Breaks