AZ FLAP SR88(1) Final Pavement Recommendations.pdf
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- Attached to
- AZ FLAP SR88(1) Apache Trail Federal contract opportunity
- Solicitation number
- 6982AF21B000027
About this file
This memorandum provides the pavement recommendations for the AZ FLAP SR88(1) Apache Trail project in Maricote County, Arizona. The project consists of rehabilitating 11 miles of gravel road along State Route 88 between Apache Lake Marina and State Route 188 through the Tonto National Forest. Traffic volumes average 200 vehicles per day, with granular subgrade soils and grades up to 18%.
The recommended pavement sections include a double chip seal with aggregate base for grades under 5% and 2.5 inches of asphalt concrete pavement with aggregate base for steeper grades between 5-18%. Additional recommendations cover prime coat, fog seal, and standard specifications. Major bid items consist of roadway excavation, riprap, chip seal, asphalt, aggregate base, drainage features including pipe culverts and reinforced concrete box culverts. The anticipated cost range is $12-16 million. The solicitation advertises in late October with a bid opening in early December and award by late December for construction from winter 2022 to fall 2022. The Federal Highway Administration solicits bids for the project.
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Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| Bid Opening Summary Apache.pdf | ||
| QnA AZ FLAP SR 88(1) Apache Trail 11.23.21.pdf | ||
| 11-17-21 Q and A SI and A Sheet Str 00031 Pine Creek Bridge SR88.pdf | ||
| QnA 11-4-21.pdf | ||
| Amendment A001.pdf | ||
| Amendment A001 Page A-1 AZ FLAP SR88(1) Apache Trail .pdf | ||
| AZ_SR88(1)_Apache Trail_Final Hydraulics Report.pdf | ||
| AZ FLAP SR88(1) Apache Trail - Final Plans-Updated.pdf | ||
| Road Cut Excavation Recommendations Apache Trail AZ FLAP SR88(1).pdf | ||
| AZ FLAP SR88(1) Apache Trail IFB.pdf | ||
| FP-14_Eng.pdf |
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Text version
Memorandum
Subject: AZ FLAP SR88(1)
Apache Trail (Arizona State Route 88) Final Pavement Recommendations
Date: August 10, 2021
From: Robert Norick
Through:
Pavement & Materials Engineer
Mike Voth Pavement & Materials Team Lead
To: Dustin Robbins, PM Thomas McCrary, Lead Designer
Project Description:
This memorandum provides the pavement recommendations for the AZ FLAP SR88(1) Apache Trail project in Maricopa County, Arizona. The project consists of the rehabilitation of the 11 miles of the gravel surfaced Apache Trail (State Route 88) from the Apache Lake Marina (MP 229) north to the end of the existing pavement south of its intersection with the paved State Route (SR) 188 and Roosevelt Lake.
The Apache Trail is a designated state route (SR 88) that passes through the Tonto National Forest and Superstitious Mountains from Apache Junction (northeast Phoenix) to Roosevelt Lake; 42 miles in length. The highway features scenic views of the Salt River, Apache Lake, and the adjacent mountains. According to President Theodore Roosevelt, “the Apache Trail combines the grandeur of the Alps, the glory of the Rockies, and the magnificence of the Grand Canyon”. The route is on Forest Service land but is maintained by the Arizona Department of Transportation (ADOT). The overall goals of the project are to reduce maintenance and operating costs and preserve the “historic” elements of the route. Roadway grades range from 0.5% to as much as 18%. For the steep road sections, it is common for the surface gravel to experience severe washboarding, requiring weekly blading to maintain a drivable surface.
Based upon traffic counts from ADOT and the U.S. Forest Service, the two-way average annual daily traffic (AADT) along this section of road is estimated at 200 vehicles per day with the vast majority of the traffic being cars, pickups, and SUVs (i.e. a “low” traffic level). Site visits by Central Federal Lands’ (CFL) pavement and geotechnical engineers (March 2017 and December 2019, respectively) visually classified the road’s subgrade soils as granular decomposed granite; “very good” subgrade soils. The site visits noted that there were no areas of subgrade structural
ROBERT E NORICK Digitally signed by ROBERT E NORICK Date: 2021.08.11 18:49:20 -06'00' distresses due to poor subgrade soils or large traffic loads. The depth of the road’s existing aggregate base is conservatively ignored for the pavement recommendations.
Based upon the road’s “low” traffic level, “very good” subgrade soils, and “historic” elements, as well as, a limited project budget, the cross functional team (CFT) selected a double chip seal on aggregate base as the preferred pavement section for the project.
The CFT accepts the increased risk related to the construction and durability of a chip seal pavement section.
Pavement Recommendations:
After evaluating alternatives, the following pavement structural sections are recommended for the project.
Road Segments with Grades Less than 5%
Type 2B Double Chip Seal with CRS-2P Emulsified Asphalt 4 inches of Crushed Aggregate Base, Grading D Roadway Reconditioning
Steep Road Segments (Grades between 5% and 18%)
2.5 inches of Asphalt Concrete Pavement 4 inches of Crushed Aggregate Base, Grading D Roadway Reconditioning
Additional recommendations include a prime coat applied to the base prior to placement of chip seal and asphalt and a fog seal applied to the final pavement surface. CFLHD standard SCRs related to pavement and materials are expected to be used with the exception of the following FP-14 sections: Section 407 Chip Seal; Section 411 Asphalt Prime Coat; Section 702 Asphalt Material; and Section 703 Aggregate. These SCRs are included as an attachment to this memo. The 407 SCR specifies a Type 2B chip seal with a polymer modified cationic emulsified asphalt grade CRS-2P. The 411 SCR specifies two prime coat options: a topical cutback asphalt prime or a processed emulsified asphalt prime. The 702 SCR to incorporate cutback asphalt for prime and the 703 SCR to modify the gradation for Type C chips to encompass ADOT chips.
Recommended FP-14 Pay Items:
Item Number Item Description Unit
30101-2000 Aggregate Base Grading D Ton 30301-6000 Roadway Reconditioning Mile 40301-0100 Asphalt Concrete Pavement, Type 1 Ton 40601-0000 Fog Seal Ton 40702-1200 Chip Seal, Type 2B Sqyd 40711-0000 Emulsified Asphalt Ton 41102-0000 Prime Coat Sqyd 41105-0000 Blotter Ton
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