County_Road_43_Questions_and_Answers_8.19.14.pdf

County Road 43(1)

Questions and Answers

8/19/2014

1. CFL’s response to an earlier question indicated that the Project’s permitting allows for impacts to the river’s current channelization and installation of concrete/grouted structures in the river, even though these activities are not authorized by the Nationwide Permit. Can you post the

Project permit? This would be helpful with identifying any additional restrictions related to performing this work.

The permit(s) are included in Appendix 4 of the solicitation. Again, all anticipated roadway and river reconstruction work is covered under the current permit(s).

2. What is the status of the utility relocations? Do the utility agencies have approved temporary relocation plans? Utilities need to be relocated prior to the start of some early construction activities and if temporary relocation plans have not yet been developed, the concern is that this process may delay the start of some early construction activities.

Per SCR Section 107.02, utilities are in conflict and will need to be relocated during construction. Utility plans are not available.

3. The quantity for embankment, on sheet B5, has been adjusted by (30,000) cy to account for embankment placed during the Emergency Access repair work. Much of the new roadway alignment is offset from the current/existing roadway, and if this material was placed to raise the current/temporary roadway and repair wash-outs, it will not be available as fill for the construction of the new roadway. This is because the current/temporary roadway must be open until the new roadway is complete and ready for traffic. Can you provide more information regarding the areas where the 30,000 cy of embankment was placed?

The quantity for embankment placed during the Emergency Access repair work (sheet B5, 30,000cy), is an estimate of material previously placed in locations where the proposed alignment coincides with the existing alignment.

4. The following specialists are required on site during blasting. (d) Vibration Specialist. Does the Vibration Specialist have to be on site for each blast?

The contract does not require a Vibration Specialist to be on-site for all blasts. Per SCR Section, the Vibration Specialist will determine the need and frequency of monitoring of the work.

5. Can the test blasts be larger than 100 cubic yards? It’s our experience that too small of a test blast may not represent the characteristics and outcome of rock movement, fragmentation, displacement or vibrations and overpressure of a typical blast. Many projects allow for test blasts up to 500 to 1,000 cubic yards.

A test blast of up to 500 cubic yards is acceptable.

6. Is the blasting contractor going to be responsible to “Record and maintain a log of each blast hole drilled indentifying the depth, color and character of the cutting, penetration rate…etc.”? Past DOT projects waived this item.

A blast log will be required, at a minimum record the location and depth of hole(s) per day.

7. Is the use of blasting mats going to be required? If no structures are in close proximity to the blast zones will the use of blasting mats be an option versus mandatory?

The need for blasting mats should be determined by the Contractor or Vibration Specialist per

SCR Section 205.06.

8. (b) Vibration and air-blast reporting. (2) Is it mandatory to have the Vibration Specialist observe the blast and interpret vibration and air-blast data?

The need for on-site observation shall be determined by the Vibration Specialist.

9. Does the owner(s) of the project have useable land nearby the project alignment allowing for a temporary explosives magazine site? The site would need to be approx. 200 ft x 100 ft. in dimension. The distance from the temporary magazine site to closest inhabited building would need to be approx. 1,700 to 2,000 feet. The distance for public highways with traffic volume

3,000 or fewer vehicles per day, to the magazine site would need to be approx. 520 to 720 feet.

The construction limits and staging areas do not prohibit the use of temporary storage. Other local, state and federal requirements are the responsibility of the Contractor.

10. Will the locations of the rock bolts be identified for installation using conventional rock drills and equipment, during the road cut excavations allowing for bench access? Or will the rock bolt locations be identified and installed after the bench excavations are removed; meaning the bolts will be installed via crane baskets or other means?

It is anticipated that all rock bolts locations will be identified during roadway excavation operations, allowing installation from the excavation bench.