Interested_Contractor_questions_0004.docx

Contractor Questions

Amendment No. 03

1. 32 01 16.71 para 3.2.A.3 directs the contractor to increase the depth of milling where delamination is encountered. This is a lump sum contract. For bidding purposes should the contractor carry a specified additional quantity of milling and HMA pavement to account for this possibility, or will additional quantities be addressed by a contract modification?

a. No, do not carry a quantity, Bid per the plans

2. Sheets C6A list approx. (55) culverts to be cleaned. Although the charts list their coordinates, they do not list the sizes. Are the sizes of the culverts available?

a. Response: The culverts are between 15” and 48”. Culverts that have stream flow will not be cleaned as part of this contract

3. The cores provided in the geotechnical report indicate concrete pavement below the majority of the HMA Pavement. The full depth patching detail on C2B indicates the complete removal of the HMA pavement layer and 9” of Aggregate Base below. The detail does not show the concrete pavement. Is it the intent to sawcut and remove the concrete pavement in these areas and replace with aggregate base, or is it the intent to only remove the HMA layer to top of concrete and build the HMA layer back to grade where underlying concrete pavement exists?

a. Response: The full depth pavement replacement is only on the shoulders where there is not concrete

4. Sheets C2B indicate anticipated patching between respective mile posts in terms of percentage. Please confirm the percentages listed are in reference to the total pavement surface area. For example MM 3.0 – MM 4.0 is listed as 40%. If this section is measured as 18,000 sy, the expectation would be for 7,200 sy of patching (5,400 sy of full depth (75%) and 1,800 sy of partial depth)?

a. Response: The patching is per note 3 on the typical section.

5. In reference to question 4 above, the plans do not delineate the expected configuration/dimensions of full and partial depth patching. This significantly affects price as size and configuration will dictate means and methods. For example a consistent width patch for a significant distance can be excavated with a milling machine very efficiently and cost effectively on a per SY basis as opposed to numerous smaller isolated patches that will need to be manually removed or conventionally excavated resulting in a much higher per SY cost. Can anymore guidance be given to narrow the intent of the patching?

a. Response: The means and methods is the responsibility of the contractor based on the contract documents

6. Please confirm the intent of the partial depth patch. The detail shows top of patch even with existing pavement surface and bottom of patch as milled surface. The entire surface of the road will be milled to a minimum depth of 2.5”. Wouldn’t the partial depth repair be from the milled surface to the bottom of HMA pavement, not from existing surface to top of milled surface? Please advise.

a. Response: See the attached addendum 2 drawings for clarification

7. Partial depth patching detail indicates the “Specified HMA Patch shall be full depth of existing pavement or 3”, whichever is greater”. Sticking with the example of MM 3.0 to MM 4.0, the cores show an average HMA thickness of approx. 10 in. after the 2.5” depth mill of the surface, the average partial depth pavement patch will be approx. 7.5” of HMA, a significant difference from 3”, resulting in thousands more tons of asphalt. Please confirm this is the intent as this is a lump sum project. This question also applies to the Full Depth Patch repair detail.

a. Response: See the attached addendum 2 drawings for clarification

8. The average HMA Pavement thickness between MM 6.5 and 7.0 ranges from 6.5” to 10“. This area is schedule for full reconstruction. The detail indicates the HMA will be removed down to the surface of the existing underlying concrete pavement and 5.5” of HMA will be placed back. Is the intent to follow the grade of the underlying concrete road with the new road? This will lower the new surface elevation of the road 1.5” to 4.5”. If the intent is to remove the HMA down to the surface of the underlying concrete and shim back up to original grade, can an assumed quantity of shimming be provided so all contractors are pricing the same quantities as this is a lump sum contract?

a. Response: See the attached addendum 2 drawings for clarification

9. Typical Mill/Overlay Section and Typical Full Reconstruct Section indicate geotextiles reinforcing the outer edges of road spanning over the seam created by the outer edge of the underlying concrete road. The details do not indicate this is on an as needed basis. However, there are percentages provided for geotextile estimates for each respective mile. Are the percentages states inclusive of the geotextile shown in the two details or in addition to?

a. Response: See the attached addendum 2 drawings for clarification

10. Typical Mill/Overlay Section shows a typical 2’ lap of the geotextile across the edge of concrete seam. Full Reconstruct detail does not provide a typical lap dimension for the geotextile, but it looks greater than 2’. Please provide a typical lap dimension of the geotextile in full reconstruct section.

11. A chart is provided on C2B which shows the minimum recommended HMA thickness at various thicknesses of existing subbase. For example is the existing subbase is only 8”, then the HMA thickness shall be 9”, 1.5” thicker than the typical detail shows. This could result in a significant HMA tonnage increase. Can an assume quantity be carried for bidding purposes as this is a lump sum contract?

12. Please provide the HMA mix for the surface coarse ( 9.5 mm, 12.5mm)? Also, In reconstruction areas, are the base course HMA layers a different mix than the surface course? Please advise.

a. Per the specification 321216 page 10, Table 2-1 0.3 to <3- (highlighted in RED below) The Aggregate is per 2.3 – B AASHTO M323 Superpave Volumetric Mix Design. The table is attached below and is provided for reference only.

13. Specification Section 31 25 00 references E&S Drawings. I don’t see any E&S drawings provided with the documents. Are E&S plans available for bidding purposes?

a. Response: E&S plans are not available. The Contractor is required per SECTION 01 57 23 – UNDER-AN-ACRE POLLUTION PREVENTION to prepare a pollution prevention plan that covers E&S. Typically, E&S requirements are minor on pavement rehabilitation projects with the plans showing inlet protection, seeding, and straw waddles where needed; however, this is the responsibility of the Contractor to prepare the plan and obtain acceptance.

14. Will cleaning of culverts require permitting from US Army Corp of Engineers or DEP? This may add significant lead time.

a. Response: No

15. In Spec Section 32 12 16, Part 2 – Products, Sub-Part 2.1, Article B, number 1 states: RAP may be used as a component of the asphalt mixture if approved by the contracting officer. If RAP is allowed, this will have an enormous effect on the pricing structure.

a. Response: RAP may be used as a component of the asphalt mixture. Usage of RAP is subject to the following requirements: a maximum of twenty percent (20%) for surface courses; and a maximum of twenty-five percent (25%) for all other courses. Percent RAP is computed by mass.

Amendment 03

1. Technical factor #2 indicates the contractor should use an anticipated NTP date of November 1, 2021. The 1442 indicates a performance period of 262 days, which would bring the completion date to July 21, 2022. However, the deliver date on the 1442 state March 1, 2022 to Nov 18, 2022. This performance period is more practical due to the temperature sensitive work and the exclusionary period for the Bald Eagle Nesting Area. Please clarify the period of performance and what anticipated NTP date should be used for Factor 2.

a. The instructions have been revise to assume February 18, 2022 as the date for the Notice To Proceed.

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