NM BR AAO ELBU(1) Pavement Memorandum.pdf
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- NM BR AAO ELBU(1) Elephant Butte Historic Roads
- Solicitation number
- 6982AF24B000011
About this file
This is a technical memorandum from the Federal Highway Administration providing pavement and gravel surfacing structural recommendations for the Elephant Butte Historic Roads project in Sierra County, New Mexico. The project involves resurfacing and rehabilitation of multiple gravel and asphalt roads and parking lots at the Dam Site and Paseo Del Rio area within Elephant Butte Lake State Park and Historic District.
The memorandum details field investigation findings from January 2021, which revealed asphalt thicknesses of 1-4.5 inches and base course thicknesses of 0-3 inches, with subgrade soils consisting of silty sands with gravel and clayey gravels. Specific recommendations are provided for 20 different road and parking area sections, generally calling for 3" Hot Mix Asphalt (HMA) with 4-6" Aggregate Base Course (ABC) for roads, and 8" aggregate surfacing for some parking areas. The document includes a detailed soil testing report and specifies eight bid items needed for construction, including subexcavation, roadway aggregate, asphalt concrete pavement, fog seal, prime coat, tack coat, and joint sealing. The work area requires special consideration due to proximity to historic structures, making full depth reclamation impractical.
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Text version
Memorandum
Subject:
NM BR AAO ELBU(1)
Elephant Butte Historic Roads Pavement Recommendations
Date: August 29, 2024
From: Robert Norick
Through:
Pavement & Materials Engineer
Mike Voth Supervisory Materials Engineer
To: Solomon Haile, PM
Project Description:
This memorandum provides the pavement and gravel surfacing structural section recommendations for the NM BR AAO ELBU(1) Elephant Butte Historic Roads project located in Sierra County, New Mexico, east of the City of Truth or Consequences. The project consists of the resurfacing and/or rehabilitation of multiple gravel and asphalt roads and parking lots at the Dam Site and Paseo Del Rio area; all within the Elephant Butte Lake State Park and the Elephant Butte Historic District. Elephant Butte Lake State Park is managed by New Mexico State Parks under a lease agreement with the U.S. Bureau of Reclamation. There are multiple historic walls and structures adjacent to the roads and parking lots which will need to be protected during construction.
Field Investigation:
On January 20, 2021, CFLHD Pavement & Materials (Marty Fey and Trevor Moulton) conducted a field investigation for the project which included pavement coring and subgrade sampling at various locations throughout the recreation area. A hand auger, pick, and shovel were used to collect two subgrade samples. These samples were submitted to the CFLHD lab for soil classification and R-Value testing (see attached).
The investigation found asphalt thicknesses ranging between 1 and 4.5 inches with base course thicknesses ranging between 0 and 3 inches. The subgrade soils consist of silty sands with gravel and clayey gravels with sand; AASHTO A-1-b and A-2-6 soils. The investigation found old, oxidized asphalt pavement with high severity fatigue cracking, as well as, aggregate surfacing with severe wash-boarding. The project is a good candidate for full reconstruction. Due to the tight work area and the close proximity to historically significant structures, full depth reclamation or other pavement recycling methods are not practical.
Pavement, Gravel Surfacing, and Material Recommendations:
Traffic counts are not available for the Elephant Butte Historic Area. The roads are classified as recreational with low speeds and little to no commercial traffic. The Federal Lands Highway (FLH) Project Development and Design Manual (PDDM) and engineering judgement were used to provide recommended pavement and gravel surfacing structural sections for the project as follows.
Road / Parking Area Observed Surfacing Recommended Sections Winding Road A 3" HMA / 0" ABC 3" HMA / 6" ABC Winding Road B 4.5" HMA / 0" ABC 3" HMA / 6" ABC Ruins Road Native 3" HMA / 6" ABC Hospital Canyon Road A 2" Gravel 3" HMA / 4" ABC Hospital Canyon Road B 4" HMA / 0" ABC 3" HMA / 4" ABC Dam Site Entrance Road 3" HMA / 0" ABC 3" HMA / 6" ABC Dam Site Marina Entrance Concrete Road Concrete Reseal Joints Dam Site Marina Entrance Unpaved Road Native 3" HMA / 6" ABC Dam Site Upper East Parking 3" HMA / 3" ABC 3" HMA / 4" ABC Winding Road Parking 1" HMA / 0" ABC 3" HMA / 4" ABC Recreation Area Restaurant Overflow Parking 1" HMA / 0" ABC 3" HMA / 4" ABC Recreation Area Restaurant Parking 1.5" HMA / 3" ABC 3" HMA / 4" ABC Dam Site Upper West Parking 2" Gravel 8" Aggregate Surfacing Dam Site Marina South Parking A Native 8" Aggregate Surfacing Dam Site Marina South Parking B 1" HMA / 0" ABC 8" Aggregate Surfacing Paseo Del Rio Campground Access Road 4" HMA / 0" ABC 3" HMA / 4" ABC Paseo Del Rio River Access Road Native 8" Aggregate Surfacing Paseo Del Rio Campground Comfort Station 2" HMA / 3" ABC 3" HMA / 4" ABC Old Fish Hatchery Parking 1.5" HMA / 0" ABC 3" HMA / 4" ABC Paseo Del Rio Hwy 51 River Access Parking Native 8" Aggregate Surfacing
The construction contract should include a nominal amount of subexcavation (~200 cubic yards) to be used at the discretion of the CO. CFLHD standard SCRs related to pavement and materials should be used for the project with the following bid items.
Item Number Item Description Unit 20402-0000 Subexcavation CUYD 30202-2000 Roadway aggregate, method 2 TON 30202-2100 Roadway aggregate, method 2, surface course TON 40301-0100 Asphalt concrete pavement, Type 1 TON 40601-0000 Fog seal TON 41102-1000 Prime coat, method 1 SQYD 41201-0000 Tack coat TON 50202-0000 Sealing joints and cracks LNFT
| NM BR AAO ELBU(1) Pavement Memorandum |
| 21-122-S |
| 2024-08-29T16:05:39-0600 | |
| ROBERT E NORICK |
File details come from the government source that posted it. Updated .