AddendumNo2.pdf
PDF 140 KB Posted
- Attached to
- Polhamus Park Parking Lot - Granby, CO
- Solicitation number
- 2025-002
- Issued by
- Gilpin County, Colorado
About this file
This is an Addendum Order (Order No. 1) for the Polhamus Park Parking Lot project issued by the Town of Granby, Colorado, with engineering services provided by SGM, Inc. The addendum, dated March 7, 2025, modifies the original contract documents for the parking lot construction project, with a bid date of March 13th, 2025. The contractor has two potential work commencement options: either begin work on or before May 12th, 2025 and complete by June 27th, 2025, or start on or after July 7th, 2025 and complete by August 15th, 2025. There will be no work permitted between June 29th and July 5th. The document also clarifies that traffic control will not require flaggers, as two 11-foot lanes can be maintained throughout construction.
The addendum provides specific technical details about detectable warnings for curb ramps, including requirements for materials, installation, and color contrast. The Town of Granby prefers cast iron detectable warnings and has detailed specifications for their installation, including guidelines for pavers and plates. The document revises Sections 105 and 608 of the Standard Specifications, outlining precise requirements for materials, fabrication, transport, and installation of detectable warnings. These specifications include technical details such as ADA compliance, color contrast requirements, sand specifications, and installation techniques. The cost for detectable warnings, including all associated materials and labor, will be included in the overall project work and will not be separately measured or paid.
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Other files
| File | Type | Posted |
|---|---|---|
| AddendumNo1.pdf | ||
| Polhamus Park-AD.pdf | ||
| Polhamus_Park-Project_Manual.pdf | ||
| Polhamus Park-BID_250212signed.pdf |
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Text version
ADDENDUM ORDER
ORDER NO. 1
DATE: 3/7/2025
BID DATE: March 13th, 2025
NAME OF PROJECT: Polhamus Park Parking Lot
OWNER: Town of Granby
ENGINEER: SGM, Inc
The following changes are hereby made to the CONTRACT DOCUMENTS:
Revisions:
1. The Contractor shall commence work under the Contract on or before May 12th, 2025. The Contractor shall notify the Engineer, in writing, at least 30 days before the proposed beginning date. The date that work begins shall be subject to the Town of Granby approval. The Contractor shall complete all work by June 27th, 2025 per the "Notice to Proceed." Alternatively, the Contractor shall commence work under the Contract on or after July 7th 2025.
The Contractor shall notify the Engineer, in writing, at least 30 days before the proposed beginning date. The date that work begins shall be subject to the Town of Granby approval. The Contractor shall complete all work by August 15th, 2025 per the "Notice to Proceed." There shall be no work between June 29th to July 5th.
Clarifications:
Question: Can the street be closed at all during construction or will traffic control and flaggers need to be utilized for the duration of the project?
Answer: We don’t anticipate needing flaggers for traffic control. The contractor is able to maintain two 11’ lanes of traffic throughout the duration of construction.
Question: Will the detectable warnings be steel or composite?
Answer: The Town prefers to use cast iron detectable warnings.
Additional Information provided not included in the Contract Documents:
- Revisions of Sections 105 and 608 Detectable Warnings
ADDENDUM ACKNOWLEDGED BY:
Name Date
PREPARED BY:
Michael Morrison, PE
List of Attachments:
TOWN OF GRANBY
POLHAMUS PARK PARKING LOT MARCH 2025
REVISION OF SECTIONS 105 AND 608
DETECTABLE WARNINGS
Sections 105 and 608 of the Standard Specifications is hereby revised for this project as follows:
Subsection 105.03 shall include the following:
When corrective work is required for curb ramps, the Contractor shall submit a method statement in writing outlining the work to be performed. Corrective work for curb ramps shall not be performed until written approval has been received from the Engineer. All corrective work for curb ramps shall be at the
Contractor’s expense.
Subsection 608.01 shall include the following:
This work includes the installation of detectable warnings on concrete curb ramps as shown on the plans.
Subsection 608.02 shall include the following:
Detectable warnings on curb ramps shall be truncated domes of the dimensions shown on the plans.
Domes shall be prefabricated by the manufacturer as a pattern on embeddable surface plates, concrete pavers, or masonry pavers.
Plates and pavers shall meet all Americans with Disabilities Act (ADA) requirements for truncated domes, and when installed, shall be capable of producing the pattern of domes shown on the plans.
Pavers shall meet the requirements of ASTM C 902 or ASTM C 936.
Plates used shall be one of the products approved for use as detectable warnings listed on CDOT’s
Approved Products List.
The domes and their underlying surface shall have a discernible contrast of color from the adjacent surface. The contrasting colors shall not be black and white.
The paver contrast shall be achieved by adding pigment during the fabrication of the paver. Prior to the start of work, the Contractor shall submit appropriate documentation from the manufacturer verifying that the contrast has been met, along with a sample paver, to the Engineer for approval.
When plates are used, prior to the start of work, the Contractor shall submit appropriate documentation from the manufacturer verifying that the contrast has been met, along with a sample plate, to the Engineer for approval.
Bedding and joint sand for pavers shall be free of deleterious or foreign matter. The sand shall be natural or manufactured from crushed rock. Limestone screenings or stone dust shall not be used. Sand for bedding material shall conform to ASTM C 33. Sand that is to be placed between joints shall conform to
ASTM C 144.
Subsection 608.03 shall include the following:
TOWN OF GRANBY
POLHAMUS PARK PARKING LOT MARCH 2025
(g) Detectable Warnings for curbs ramps.
1. Pavers. Pre-fabricated pavers for detectable warnings shall be brought to the site in steel banded, plastic banded or plastic wrapped cubes capable of being transported by a fork lift or clamp lift.
Pavers shall be carefully removed and stacked in a manner which results in the least amount of damage. All pavers that are damaged during transport or delivery will be rejected and shall be replaced at the Contractor’s expense. Minor cracks or chipping due to transport and handling that do not interfere with the structural integrity of the paver or the overall pattern of truncated domes will not be deemed as grounds for rejection.
The Contractor shall spread the bedding sand evenly in the area shown on the plans and shall screed the sand to an appropriate embedment depth as shown on the plans or as directed by the Engineer. Sufficient sand shall be placed to stay ahead of laid pavers
Pavers shall be placed in a running bond pattern. Pavers shall be installed such that the base of the truncated dome is at the same elevation as the adjoining surface, allowing for a smooth transition between the curb ramp and the detectable warning.
When cut pavers are required to fill gaps between the pavers and the edge of concrete, the
Contractor shall bevel portions of the truncated domes at a 45-degree angle to create a smooth transition between the partial dome and the curb ramp surface. Unless otherwise directed by the Engineer, pavers shall be cut and installed in such a manner that the domes on the cut sections will not significantly impact the overall pattern of the truncated domes.
The Contractor shall use a plate vibrator to embed the pavers into the sand. The size and type of plate vibrator shall be in accordance with manufacturer’s recommendations, or as directed by the
Engineer. All pavers that are damaged during embedment shall be replaced at the Contractor’s expense.
Joint spacing between paver units shall be in accordance with the manufacturer’s recommendations, or as approved by the Engineer. Joints shall be filled completely with joint sand. Excess sand shall be removed by sweeping.
2. Plates. Prior to installation of the plates, concrete conforming to subsection 608.02 shall be installed and consolidated as a base for the plates. The concrete shall be placed to a thickness that will allow the base surface of the plates to be at the same elevation as the adjacent concrete. The plates shall be embedded into the plastic concrete in accordance with the manufacturer’s specifications.
Subsection 608.05 shall include the following:
Detectable warnings on curb ramps, including sand, pavers, plates, and all other work and materials necessary for fabrication, transport, and installation will not be measured and paid for separately, but shall be included in the work.
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