To: Honorable Mayor and Members of Town Council
From: Mark Marlowe, P.E., Director of Castle Rock Water
Title
Resolution Authorizing Change Order Number Five to the Construction Contract between the Town of Castle Rock and T. Lowell Construction, Inc. and Approving an Increase in the Contract Sum for the 2019 Castle Rock Water Meter Replacement Project
Body
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Executive Summary
The purpose of this memorandum is to request Town Council’s approval of a Resolution (Attachment A) for change order number five to the construction contract with T. Lowell Construction, Inc. (T. Lowell), for the construction of new water metering facilities for the Winrock Apartments and Aspen Meadows Townhomes. This project replaced the existing water meter pits at the Winrock Apartments and Aspen Meadows Townhomes. The cost overrun was a result of a quantity error on the bid tab and unexpected site conditions. Staff recommends approving change order number five with T. Lowell in the amount of $5,516. The construction change order (Exhibit 1) is included.
Discussion
Town Council awarded the project in May 2019 in the amount of $370,000, with an authorized contingency in the amount of $37,000. The Winrock Apartments site was particularly challenging for this project. A project location map has been provided (Attachment B). There were no record drawings for the existing water distribution facilities for this site. The project design was based on surface locates and the best available mapping for the site. Once the contractor began excavating the site, it became apparent that the assumed project information was not correct. Change orders 1 and 2 authorized additional potholing and piping modifications due to the differing site conditions. Change order 3 addressed additional fitting costs at the Aspen Meadows vault due to unexpected piping configuration around the vault. The total cost for the first three change orders was $15,500.
Change orders no. 4 and no. 5 address the quantity adjustments for the project. There were quantity reductions for dewatering, temporary water service at the Aspen Meadows Townhomes, and sidewalk replacement at Aspen Meadows. Quantity additions are needed for asphalt paving and concrete replacement at the Winrock Apartments. The concrete pan replacement was bid on a six-inch thick pan in their driveway. The actual concrete pan was ten-inches thick. The asphalt paving quantity was overrun due to an error in the bid tab quantity. The value was calculated as cubic yards of asphalt, but the quantity shown on the bid tab was square yards of six-inch thick asphalt. Change order no. 4 approved the quantity adjustment up to the previously authorized contingency. Change order no. 5 requests Town Council approval of the remaining cost associated with the concrete and asphalt quantity adjustment.
|
Change Order |
Description |
Cost |
|
1 |
Winrock potholing |
$1,800 |
|
2 |
Winrock 6” water main |
$11,300 |
|
3 |
Aspen Meadows pipe fittings |
$2,400 |
|
4 |
Winrock asphalt & concrete adjustment |
$21,500 |
|
5 |
Winrock asphalt & concrete adjustment |
$5,516 |
|
Total |
|
$42,516 |
Budget Impact
Funds for this project are available in the 2019 budget under the “Distribution System Upgrades” (Account No. 210-4275-442.75-38) account. Staff requests approval of change order no. 5 in the amount of $5,516, for a total authorization of $412,516.
Staff Recommendation
Staff recommends Town Council’s approval of the Resolution authorizing change order no. 5 with T. Lowell Construction, Inc. for the 2019 Castle Rock Water Meter Replacement Project in the amount of $5,516, for a total authorization of $412,516.
Proposed Motion
“I move to approve the Resolution as introduced by title.”
Attachments
Attachment A: Resolution
Exhibit 1: Change Order
Attachment B: Map