42240025 RFI questions RESPONSES.pdf

DMVA 42240025 RANGE ROAD REPAVING

FORT INDIANTOWN GAP

MAY 29, 2024

RFI-1 – 22 MAY 2024

1. Are we allowed to close the entire width of the road while we do the excavation for the pipe crossing versus closing only half at a time. There will be a significant difference in the price.

ANSWER: FTIG can accommodate full closure for the minimum amount of time to install the pipe crossing under the road. Notification of planned closure alternative shall be submitted with the bid. Five days advance notice of closure shall be provided. A proposed work schedule for each crossing shall be prepared and submitted showing number of days each closure will be in place. The contractor will also be responsible for all traffic control devices and control (material and personnel) in accordance with PennDOT standards.

RFI-2 – 23 MAY 2024

2. For the Culvert pipe crossings specifically for the 72". Would it be possible to do the work overnight and have the road closed, this would minimize cost of having to do the pipe replacement in a two step operation.

ANSWER: See above response to RFI-1 Item #1.

3. Would there be any consideration to accepting Full Depth Reclamation (FDR) as opposed to full depth road removal? FDR is a practice that is becoming more and more common in our area and is used by many Townships, Airports, Conservations Districts and even PennDOT in some applications.

In this application, our suggestion would be 12” FDR w/Portland Cement for the full depth areas on the plans. This process would include a certified mix design to provide the desired subgrade strength prior to our work taking place.

With all work following PennDOT pub 408 spec, the process would go as follows:

1. Mix Design Sample existing road/subbase and perform mix design to calculate amount of Portland cement needed to achieve 250-500psi strength. Mix designs typical take 4-6 weeks to complete, depending on lab schedules. This mix design will then be tested in the field during our operation to confirm we are meeting requirements and design parameters.

2. Pulverization Once construction is scheduled, we start by pulverizing the existing road surface with a road reclaimer. This is performed by dry mixing the existing asphalt roadway with the existing subbase to create a uniform blend of asphalt, stone and subsoil. This mixture is left in-place after mixing. After pulverizing, we will compact, grade and shape the pulverized material to achieve design subgrade elevation and cross slope.

3. Apply Strength Agent After the existing road has been pulverized and shaped, we will surface spread dry Portland cement on the pulverized work area. The application rate for Portland cement is measured by LBS/Square Yard which will be provided by the certified mix design.

4. Mixing Once the Portland cement is spread, we will mix the cement with the pulverized road base to create a uniform blend of asphalt, stone, subsoil and Portland cement by using the road reclaimer. This process also includes directly injecting water into the mix to achieve optimum moisture. Moisture content is also provided by the certified mix design.

5. Grading Compact and grade the reclaimed base material.

6. Curing After the reclaimed base has been compacted and graded to design subgrade elevation, there are 2 separate curing options to choose from. Option #1 is to water cure the base by spraying water on the treated area for 7-days. Option #2 is to spray E1 Prime Coat on the treated area immediately following the daily construction while the reclaimed base is at optimum moisture. The E1 seals in the moisture and allows the reclaimed base to cure.

7. Paving PennDOT Pub 408 states to let the reclaimed base cure for 7-day period before performing strength break tests, but if schedule is fast paced, there is also an option to perform an early 3-day strength break test to monitor mid way curing strength. After break tests are complete, paving may occur right on top of the reclaimed base, no stone subbase needed.

FDR is an economically friendly way to reconstruct roadways because it saves import/export of old and new road subbase materials. Major cost saving by eliminating trucking costs and also eliminating cost of buying new stone subbase material. On average, FDR is typically 50% of the cost compared to full road excavation and replacing with new subbase prior to paving. FDR is also a faster option if selecting the 3-day break test. On average, contractor can perform FDR on 4,500SY+ of existing roadway a day, leaving behind a recycled subgrade that is ready to be paved on.

The FDR process is a cost effective process that is used on a wide range of all projects. It has been completed on FDR projects ranging from airports, roadways, parking lots, even reclamation of 1 million square foot warehouse pads. All projects have yielded strength break tests of 400-600psi, which has always exceeded the mix design strength and provided a suitable base for new roadway paving.

ANSWER: Full Depth Reclamation may be used in areas where the plan shows and specifies full depth replacement. Notification of the use of Full Depth Reclamation alternative shall be submitted with the bid. The notification shall include the following information:

a. Contractor certification from PennDOT to complete this type of work.

b. Examples of previous projects completed by contractor of this type of work.

c. How will the contractor maintain the existing profile and cross-sections?

d. All work must be completed per PennDOT 408.

A proposed work schedule for each area of full depth reclamation shall be prepared and submitted. The contractor will also be responsible for all traffic control devices and control (material and personnel) in accordance with PennDOT standards.

DMVA REVISION – 23 MAY 2024

At the request of end user in Building 19-119, a new crosswalk shall be painted across Range Road at approximate station 83+45 from gravel lot to the north to Sorenson Road to the south, as shown on Sheet C.1.1 Revision 1 dated 23 May 2024. A clip of the sheet is below:

Any further clarification or explanation required, please let me know.

Respectfully, DOROTHY A. STERNER, P.E.

DMVA – Engineering and Architecture