Amendment_0001_-_PRA-GWMP_500(1).pdf

Amendment No. 0001

Info Page 1 of 1

U.S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

EASTERN FEDERAL LANDS HIGHWAY DIVISION

Project PRA-GWMP 500(1)

George Washington Memorial Parkway Solicitation: DTFH71-15-B-00016

The purpose of this Amendment is to:

1) Revise the Special Contract Requirements (J Pages) as follows:

a) Section 108 to revise the weekend work restrictions.

b) Section 156 to add temporary traffic control requirements and revise the nighttime work restrictions.

c) Section 579 to add and revise the concrete bridge deck overlay requirements.

The Bid Opening date of April 16, 2015, at 2:00 p.m. will remain the same.

Special Contract Requirements changes

1. Delete Subsection 108.01(e) of the Special Contract Requirements, page J-9, and substitute the following:

(e) Perform mill and overlay work on ramps 500A, 500B, and 500C on weekends from 1:00 a.m. Saturday to 4:00 a.m. Monday. Ramp 500B and the westbound lanes of VA Route 233 may be fully closed for up to 60 hours starting at 1:00 a.m. Saturday for Latex Modified

Concrete (LMC)-VE placement and curing.

2. Add the following after the second paragraph of Subsection 156.03 of the Special Contract

Requirements, page J-14:

Maintain at least one lane open to traffic at all times. Notify the CO 14 days in advance of any scheduled closure of the ramps or VA Route 233 and provide and maintain approved detours as shown in the plans.

3. Delete Subsection 156.07 of the Special Contract Requirements, page J-15, and substitute the following:

156.07. Add the following after the first paragraph:

Nighttime operations are permitted from 11:00 p.m. to 4:00 a.m., Monday through Friday.

4. Add the following to Subsection 579.06(b) of the Special Contract Requirements, page J-40:

After surface profiling approval and within 36 hours of expected overlay placement, shotblast and pressure wash the substrate concrete. Use a potable water source with a minimum water pressure of 4000 pounds per square inch. Remove concrete laitances, oils, fuels, and other foreign and loose material detrimental to achieving a sufficient bond.

Capture debris from shotblasting and pressure washing and remove according to Subsection

203.05(a). Cover the prepared surface with polyethylene sheeting to prevent contamination.

5. Delete Subsection 579.06(c) of the Special Contract Requirements, page J-41, and substitute

(c) Saturation. Thoroughly water-soak the milled concrete surface under traffic at least 24 hours prior to Ramp 500B and VA Route 233 lane closures for LMC-VE placement and curing. Do not use burlap. After road closure, remove puddles of standing water using a vacuum or other approved equipment. Do not use a blower or compressed air to remove water.

6. Delete Subsection 579.08 of the Special Contract Requirements, page J-41, and substitute the

579.08 Storage and Handling of Material. See Subsection 552.04 and the following:

Protect latex emulsion from freezing and prolonged exposure to temperatures in excess of 85 °F.

Store containers of latex admixture at the bridge site for a period not to exceed 10 days.

7. Delete Subsection 579.11 of the Special Contract Requirements, page J-42, and substitute the

579.11 Mixing. See Subsection 552.07 and the following:

Add reinforcing fibers to the concrete mixture following the manufacturer's recommendations.

Add fibers to the concrete mixture gradually to ensure the fibers are uniformly distributed throughout the concrete mixture.

8. Delete Subsection 579.13(b) of the Special Contract Requirements, page J-42, and substitute

(b) Delivery and sampling during actual placement. See Subsection 552.09(b), except as modified in Table 579-3.

9. Delete the third paragraph of Subsection 579.14 of the Special Contract Requirements, page

J-42, and substitute the following:

Place LMC-VE overlay only when the ambient air temperature is 50 °F and rising. At temperatures above 80 °F, the CO may require placement to be made at night or early morning hours if a satisfactory finished surface is not being achieved.

10. Delete Subsection 579.14(a)(1) of the Special Contract Requirements, page J-42, and substitute the following:

(1) Place concrete for flatwork only when the ambient air temperature is 50 °F and rising. Place concrete for other structural elements only when the ambient air temperature is 35 °F and rising.

11. Delete Subsection 579.14(b)(1) of the Special Contract Requirements, page J-43, and substitute the following:

(1) Place concrete when the ambient air temperature is less than 80 ºF.