Addendum 1_Questions _ Responses_Water Tank Rehabilitation.pdf

Addendum 1

March 11, 2025

Town of Frisco Frisco Water Tank Rehabilitation and Maintenance Services Responses by: Christopher McGinnis, Public Works Director/Town Engineer

Questions, comments and clarification requests for plan holders:

Question 1. After an on-site visit to the Tenmile tank, the foam was measured at a thickness of 4 inches, but the RFP documents indicate that the foam was 2 inches thick. Has there been any inspection or measurements taken on the Dillon Dam tank to confirm the actual foam thickness?

Response: The Town does not have measurements on the Dillon Dam tank foam thickness. For purposes of the RFP, it shall be assumed that both tanks have foam thickness up to 4 inches.

Question 2. Are there additional technical drawings that show the measurements of all components of the tanks (ex. Manways, vents, overflow pipes, height of the tank)?

Response: Many of the requested measurements are not shown on the drawings. All technical drawings can be downloaded from the following link: Water Tank Rehab

Question 3. Is there a technical drawing that shows the depth that the overflow pipe for the

Tenmile tank is buried?

Response: The Town does not have a drawing showing the depth. However, the depth of the discharge pipe valve was measured at approximately 6 feet deep.

Question 4. Are there pictures and inspection reports from the five-year inspections available?

Response: See the following link for the five-year inspection reports from 2021: Water Tank Rehab

Question 5. Are there coating reports that describe the coatings that currently exist on the interior and exterior of the tank?

Response: The Town does not have coating reports for the tanks.

Question 6. We understand that the Tenmile tank is on Denver Water property. Are there additional permitting or other considerations that are needed to be discussed with Denver Water as a part of this project? Or does the Town of Frisco have autonomy over the decisions on this land?

Response: The Town of Frisco has the right to maintain the water tank and associated infrastructure. Town Staff will communicate work as necessary with Denver Water.

Question 7. Is a cathodic protection system desired?

Response: A cathodic protection system is desired and should be included in proposals.

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Question 8. Is an active or passive mixing device wanted?

Response: An active mixing device is preferred.

Question 9. Will there be available water and power located at both tanks? The power would be used for the mixer unit and the potential cathodic protection system?

Response: There is no electricity located near the Dillon Dam Road tank – solar panels would be required for the mixer and cathodic protection.

The Tenmile tank has existing electricity at the tank which may be utilized for the mixer and cathodic protection.

Both water tanks have isolation valves and construction water available at the sites.

Question 10. The RFP documents indicate that a new 24” shell access manway is to be put in and the shell manway bolts and gaskets are to be replaced. Is the intention that there two manways in the tank’s shell upon completion?

Response: Correct, the intention is to install a new shell manway to create two shell manways per tank.

Question 11. Has lead testing been completed on the existing coatings for the interior and exterior of both tanks?

Response: The tanks have not been tested for lead, but the age of the tanks indicate that the existing tank coating contains lead. Proposers shall assume that lead is present and lead abatement requirements are needed.

Question 12. Can you provide the most recent tank inspection reports, photographs, or dive video for both tanks?

Response: Below is a link to the inspection documents: Water Tank Rehab

Question 13. Are structural as-built drawings available for the tanks?

Response: Structural as-built drawings are not available.

Question 14. Do the tanks have interior I-beams?

Response: The tanks have interior I-beams. The North Tenmile Tank has approximately 30 steel I-beams.

Question 15. Does the Town have a hydraulic model for the Town’s system and what are the expectation for the hydraulic model?

Response: The Town does not have an existing hydraulic model for the Town’s system. The project will require the Consultant to complete a high-level water model for the project. The model does not need to be a highly detailed model of the entire system, but it will need to contain sufficient analysis to review the fire flow in the water system when a tank is offline to determine if a https://friscoco-my.sharepoint.com/:f:/g/personal/chrism_townoffrisco_com/Ent2d0JIAMVBuJRmuAychwMB-LRVJDLybSpENA_JokOUVA?e=ayXMnh temporary tank or any other system modifications are required to satisfy the needs of the Summit Fire District.

Question 16. Page 4, Section 2 – Design Services requires the completion of a hydraulic analysis.

This scope of work can be extensive and will require significant coordination with the owner’s personnel to understand the system. We can assist the owner with conducting this, however, it is extremely uncommon for a contractor to complete this work for the owner.

Response: See response to question 15 above for requirements. The design build approach of the project would require the contracting entity, or a consultant to the contracting entity, to complete a high level hydraulic analysis.

Question 17. Please confirm that we can work on the North Tenmile Creek Tank between June – August. If this is not possible, will we be allowed to work on both tanks simultaneously after August? If so, this can present weather related challenges – if there is an early cold weather snap, paint curing can be impacted that can lead to premature coating failure? Would it be possible to delay the coating of one tank to 2026 if we cannot work on one tank before August 2025?

Response: The North Tenmile Creek work can occur between June – August. Additionally, the Dillon Dam tank work could also occur during this timeframe if the hydraulic analysis and/or appropriate accommodations are met which satisfy water demand requirements. If proposers think it is infeasible or not ideal to complete both tanks in one season, they may propose to complete the second tank in 2026.

Question 18. Please confirm that we are to assume that the existing coating contains lead on both tanks?

Response: See response to Question 11 above. Tanks should be assumed to contain lead and lead abatement services shall be included.

Question 19. If the tank rehabilitation for both tanks cannot be completed in 2025, would it be acceptable to complete the tank work in 2026?

Response: If proposers believe that completing both tanks in 2025 would infeasible, high risk, higher cost, or result in inferior work, then proposals shall include an alternate schedule which they believe would be best for the project. Completing the tank work in 2026 would be acceptable to the Town. Tanks must not be left inoperable over winter.

Question 20. Should graffiti resistant coatings be specified for the project?

Response: Graffiti is an existing issue at the tanks, particularly the Dillon Dam Road tank.

Proposers shall recommend improvements to minimize graffiti, such as anti-graffiti coatings, fence/security coatings, camera systems, etc.