NP DEWA 10(6) 218(2) Pavement Memo.pdf

Page 1 of 3 Pages

Form FHWA-201 (Rev. 11-67)

U.S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

Use this form in lieu of transmittal slips within Dept. of Trans. When message comment is to be retained as file material. Do not prepare carbons. Not to be used in lieu of Form FHWA-121 for informal correspondence. MINUTE-MEMO

SUBJECT: Pavement Recommendations for NP-DEWA 10(6), 218(2)

TO MESSAGE/COMMENT FROM/DATE

R.

Kotadia Project Manager

And:

S. Nawaz Highway Design Manager

To support the PS&E development for the project, we’re submitting our findings and pavement recommendations for project NP-DEWA 10(6), 218(2). The project sites are located in the Delaware Water Gap National Recreational Area in Pike County (PA) and Warren County (NJ). The project includes the replacement of Dingmans Falls Bridge and maintenance work on Vancampens Glen Bridge, along with reconstruction or rehabilitation of bridge approaches.

BACKGROUND

Dingmans Falls Access Bridge is a single span prestressed concrete beam bridge that carries Dingmans Falls Access Road. The work includes replacing the entire structure with a longer and wider bridge, approximately 32 feet wide and 90 feet long. The new bridge will require two new abutments with wingwalls, foundation systems and roadway approach reconstruction.

Vancampens Glen Bridge is a single span concrete encased steel beam bridge that carries Old Mine Road. The work at this site includes mill and overlay of the asphalt roadway approaches, embankment protection, erosion repair or riprap and miscellaneous bridge maintenance.

Existing Pavement Condition On July 24th 2019 EFLHD’s Subsurface Exploration Team obtained a total of 2 pavement cores at each Dingmans Falls Access Bridge approaches to determine the existing pavement type and thickness. The asphalt concrete (AC) pavement ranges from approximately 7 to 13 inches. Loss of bond between the AC layers was observed at approximately 5 inches from the top of the pavement. Pavement cores were not obtained from the approaches at the Vancampens Glen Bridge. The Pavement Coring Log is included in Appendix A.

PRELIMINARY PAVEMENT RECOMMENDATIONS

Based on the available data, we recommend the following pavement rehabilitation/reconstruction strategies. The recommendations included here reference the FP-14, “Standard Specifications for Construction of Roads and Bridges on Federal Highway Projects”.

K.Nguyen Pavement Engineer

Through:

M.

Elias Pavement Team Leader

05/23/2023

Page 2 of 3 Pages

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Table 1. Dingmans Falls Bridge Approaches – Reconstruction

Layer Minimum Thickness

(in)

Comments

AC Surface Course

1.5

Gyratory Asphalt Concrete Pavement (GACP), < 0.3 Million ESAL, 3/8” Nominal Maximum Size Aggregate

(NMSA), Type IV roughness

Asphalt Tack Coat

--- AC Tack Coat as per Section 412

AC Base Course 3.5 GACP, < 0.3 Million ESAL, 3/4”

NMSA

Aggregate Base 6 Aggregate Base, Grading C or D, as per

Section 703

Geotextile --- Separation Geotextile Class 2, Type E, as per Subsection 714.01 of the FP-14

Specifications

Page 3 of 3 Pages

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Table 2. Vancampens Glen Bridge Approaches – Mill and Overlay

Layer Minimum Thickness

(in)

Comments

Existing AC Surface

1.5 Milling

AC Surface Course

1.5 GACP, < 0.3 Million ESAL, 3/8”

NMSA, Type IV roughness

Asphalt Tack Coat

--- AC Tack Coat as per Section 412

AC Wedge and Leveling Course

1.0* GACP, < 0.3 Million ESAL, 3/8”

NMSA

Asphalt Tack Coat

--- AC Tack Coat as per Section 412

*Settlement of the pavement was observed at the bridge approach concrete/asphalt interface. The leveling course (1-inch minimum) will serve to re-establish the profile.

A Performance Graded (PG) 58-28 binder is recommended for the AC surface, base, and leveling courses.

cc: Construction Branch, TS Reading w/ attachments

APPENDIX A

Pavement Coring Log

Pavement Coring Log APPENDIX A Project: DEWA 10(6), 218(2)

Report Date: 09/21/2020

Notes:

1. Photographed cores show top of core on left-hand side, unless otherwise noted.

Core No. Core Photograph / Side View Location Key

BH19-01

7/24/19

Core Description Location / GPS 13.18” Asphalt Concrete (Unbonded) – Top of core is on right-hand side Loss of tack between layers at approximately 1.2” (0.1’) and 8.4” (0.7’) **(Measurements are from left to right)

Location: Old Mine Road (NJ Rte 606)

GPS: 41.057912°; -75.001330°

Core No.

Core Photograph / Side View Location Key

BH19-02

7/24/19

Core Description Location / GPS 7.08” Asphalt Concrete (Unbonded) – Top of core is on right-hand side Loss of tack between layers at approximately 2.76” (0.23’) **(Measurements are from left to right)

Location: Old Mine Road (NJ Rte 606)

GPS: 41.058081°; -75.000868°