B09_-_RFI_responses_Questions_and_Answers_to_Tuzigoot_Lead_and_Asbestos_Abatement_for_Visitor_Center_Windows_0001.pdf

Ques ons and Answers to Tuzigoot Lead and Asbestos Abatement for Visitor Center Windows.

1. Does the work include reinstallation of the windows?

Answer: No, the National Park Service Historic Preservation Maintenance Action Team will be reinstalling the windows once abatement has taken place at an offsite facility. The windows, once treated at the offsite facility will need to be packaged and will need to be delivered to H.P.T.C. / I.M.R. Flagsta Shop, 1800 South Lone Tree, Flagsta , Arizona 86001

2. The historic windows are counterweight sliders. The counterweight is buried behind the frame in the wall. Exterior wall is stone, interior looks to be plaster. The removal of some of these windows will require a removal of the adjacent hand formed plaster to accommodate complete removal of window and counterweight system. Is this destructive measure acceptable?

Answer: The lead and asbestos Abatement Contractor will not need to be concerned with the removal of the windows, that portion will be taken care of by the National Park Service Historic Preservation Maintenance Action Team.

3. Once windows are removed, who is responsible for board-up? Is there a board-up specification?

Answer: The National Park Service Historic Preservation Maintenance Action Team will board up the windows after they remove the windows and prepare the windows to be transported to the offsite treatment facility by the Abatement Contractor.

4. It is assumed that the space will be unoccupied and that the interior art and casework has been moved from the walls or removed from the space. Please confirm or let us know if we need to plan to move materials out of the way.

Answer: The space will be unoccupied, and the Park will be closed during the Abatement portion of this project. No occupancy of the building will be allowed until tests come back clearing the building for occupancy. All items that will be in the way of the Abatement Contractor will be removed from the building or staged in such a way as to facilitate easy access to each window by the Abatement Contractor.

5. The concrete exterior sill will likely have an elevated quantity of lead as the lead material tends to leach down into the concrete over time. Will a pre-abatement lead sampling of the exterior concrete sills and of the soil below be required for the project?

Answer: No. Testing of the windows and other areas of the structure have already been performed.

6. Is it acceptable to “grind” the sills to a point beneath the leaching level of the lead to pass a test. As is the porous nature of concrete and saturation rates of lead materials, this can sometimes mean a removal of up to 1/2” of materials from the surface layer to get beyond the leach line. Please advise.

Answer: The concrete sills will not need to be disturbed by the Abatement Contractor. The historic nature of the building and the scope of the Abatement will only include the wooden aspects of each window, to preserve the integrity of each window and the wood components therein.

7. Some wooden decorative headers are severely weathered and degraded, however, set in stone. Is there any expectation that some of these may need to be replaced, rather than stripped? If so, who makes that determination?

Answer: Yes, all wooden header lintels are a veneer covering a steel lintel. Every wooden lintel veneer that is severely damaged by weathering will need to be removed and disposed of in accordance with proper lead and asbestos disposal regulations. The new veneer lintels will be created and installed by the National Park Service Historic Preservation Maintenance Action Team. The National Park Service Historic Preservation Maintenance Action Team will make the determination on which wooden headers will be disposed.

8. Blinds are installed on the interior of many of the window systems. Are these to be saved and labeled for reinstallation?

Answer: The lead and asbestos Abatement Contractor will not need to be concerned with the blinds in the building the National Park Service Historic Preservation Maintenance Action Team will remove and reinstall the blinds.