S06- 2nd Questions and Responses_updated.docx

2nd Questions

1) Can the VA provide quantities for the sealing of untreated areas of the PVN and PVS plazas?

a. If not, can the VA allow for additional site visits so we can measure the plazas at the site?

North plaza is approximately 60,000 square feet (SF.) South plaza is also approximately 60,000 SF.

2) Surface of concrete combined with the extremely low viscosity of the MMA healer/sealer will likely require a rate of installation that is higher (using more material) than recommended to leave enough resin on the surface of the concrete. If the application rate is met and there is no residual liquid on the surface of the concrete in which to bind the aggregate broadcast, will this be acceptable, or will you require enough resin to allow maintain a fully broadcast surface? Use enough resin to allow for a safe, fully treated surface.

3) Broadcasting silica sand in these quantities will inevitably raise the respirable silica to levels that may be beyond OSHA recommendations.

a. How does the project team envision protecting public during the installation?

Contractor to submit Site Specific Safety Plan which will include methods (engineering controls, PPE, etc.) to protect their workers. Floors where work is being conducted will be closed for general pedestrian usage while vehicle entrance/egress route is maintained.

b. Will you consider the use of other aggregates that do not contain respirable silica that are similar in Moh hardness and size?

Contractor to submit Site Specific Safety Plan which will include methods (engineering controls, PPE, etc.) to protect their workers.

4) Is it possible to have multiple floors closed overlapping a couple of days between opening back to the public and closing for shot blasting (example half of each level 5 striping, level 4 coating, Level 3 blasting) Contractor shall anticipate 1 floor closed at a time.

5) Surface of concrete combined with the extremely low viscosity of the MMA healer/sealer will likely require a rate of installation that is higher (using more material) than recommended to leave enough resin on the surface of the concrete. If the application rate is met and there is no residual liquid on the surface of the concrete in which to bind the aggregate broadcast, will this be acceptable, or will you require enough resin to allow maintain a fully broadcast surface? Reference question 2 above.

6) Broadcasting silica sand in these quantities will inevitably raise the respirable silica to levels that may be beyond OSHA recommendations.

a. How does the project team envision protecting public during the installation?

Reference question 3 above.

b. Will you consider the use of other aggregates that do not contain respirable silica that are similar in Moh hardness and size?

Reference question 3 above.

7) How much linear footages do you anticipate each garage will have in cracks, of pre-fill at 1/8” wide or wider with clean, dry aggregate?

Minimal – focus is on treating formerly untreated surfaces to prevent further damage. Some minor cracking observed mostly along expansion joints in PVN.

8) How much linear footages do you anticipate each garage will have in Crack repairs from the underside of slab if the cracks are over 1/2” deep or if the concrete surface is very porous?

Minimal – focus is on treating formerly untreated surfaces to prevent further damage.

9) PVN Plaza & PVS Plaza – is this a split slab meaning is there a waterproofing membrane in-between the two slabs if so, applying a Methyl methacrylate would incapsulate moisture between the two slabs and cause failure.

Reference attached slab elevations and details for PVS and PVN. It appears there is waterproofing.

a. If this is the case, we would recommend a siloxane sealer so that the concrete can breathe?

For the plazas in this case this would be acceptable.

10) Pipe penetrations and voids at Bollards this should be addressed so that the flood coat doesn’t drip down onto the levels below.?

Address as necessary to prevent leakage. Removal/replacement of bollards, etc. is not required.

11) 4” cove base there is no reason to apply this with this product. And if so, are you going to want to apply caulking at the slab to wall – cove sealants?

Caulking is acceptable where feasible to apply (no need to move fences, bollards, etc.)

12) I’ve attached a datasheet with the info on our MS 945 – with no respirable silica. I would think this would be a natural fit for project considering it is highly likely that you will have patients with lung problems near the jobsite and distribution of that much aggregate will create elevated levels of respirable silica – likely well above healthy levels. Submit material for usage to VA during submittal phase.

13) What the existing sealant is on the parking garage? There is no existing sealant on the parking