UT NP ARCH 100 Bridges on Delicate Arch Road Pavement Memo

Memorandum
Subject: UT NP ARCH 100(2)
Bridges on Delicate Arch Road
Existing Structural Section Thickness
Investigation

Date: April 29, 2024

From: Ron Andresen
Materials Engineer
To: Jim Kerrigan, PM
Jeff Felling, Designer
Background:
This memorandum provides a summary of the existing structural section layer thicknesses needed for calculating full depth reclamation quantities for the upcoming project.
The project was drilled Jan 17, 2024. The company used for the drilling was QC Testing, Vernal Utah. A small excavator with a 6 inch auger was used to drill through the pavement. The project is 1.3 miles long. It begins at station 11+31 on Delicate Arch Road, where the previous 2017 Arches 10(2) project ended. This project includes new bridge construction, 1.3 miles of road reconstruction, and reconstruction of the Wolfe Ranch parking lot and the Lower Delicate Arch parking lot.
Findings:
Eleven holes were made in the roadway. The depth of each hole was approximately two feet. Deep enough to get through the existing pavement and base layer. Two holes were made in Wolfe Ranch parking lot.
• Wolfe #1 was made in the parking area close to the roadway. • Wolfe #2 was done in the parking area further from the roadway, about where the restrooms are located.
Two holes were made in Delicate Arch parking lot.
• Delicate #1 was made as you enter the parking lot, in the west part of the parking area.
• Delicate #2 was made at the east end of the parking area near where the foot trail to Delicate Arch begins.
The remaining seven holes are in the roadway, beginning at the station 13+80, and proceeding west to the end of the project. Holes were made in alternating lanes, in the

middle portion of each lane. The table below shows the specific hole information. Hole
Number

Hole Information
Location

Existing Asphalt
Thickness (in)

Existing Aggregate
Base Thickness (in)

Station 13+80,
4.0
centerline
Station 21+90,
Hole #2
4.5
eastbound
Station 27+20,
Hole #3
3.5
westbound
Station 37+70,
Hole #4
4.5*
centerline
Station 53+60,
Hole #5
5.0*
centerline
Station 69+40,
Hole #6
5.0*
westbound
Station 74+70,
Hole #7
4.5*
eastbound
Area closer to
Wolfe #1
2.5
roadway
Area further from
Wolfe #2
3.0
roadway
Delicate
West side of Parking
4.0
Arch #1
lot
Delicate
East side of parking
4.0
Arch #2
lot
* It appears there is a ½ inch thick chip seal from Wolfe Ranch to the end of the