Home / GRCA 318719 North Rim & Springs Rehabilitation Pro / Document

Attachment 10: GRCA Innercanyon GIR

Updated

A PDF document (3.3 MB) attached to GRCA 318719 North Rim & Springs Rehabilitation Pro, from the Departmental Offices. Due Jan 8, 2027, 12:00 PM (UTC-7).

File name: B08_Attach_10_GRCA_318719_Innercanyon_GIR_20250811.pdf

Download the full documentSee the bid

The full file is for paid members, or buy this bid alone.

Preview

Geotechnical Investigation Report

GRCA 318719: Rehabilitate North Rim
Utility Infrastructure
Grand Canyon Inner Canyon, Arizona
Submitted to:
HDR Engineering, Inc.
419 Canyon Avenue
Fort Collins, CO 80521
Submitted by:
GEI Consultants, Inc.
350 Indiana Street, Suite 750
Golden, CO 80401
303.625.9502
August 11, 2025
Project No. 2305987

Nate C. Soule, P.E., P.G.
Principal Engineer

Matt P. Olson, P.E.
Project Manager

August 11, 2025
Project No. 2305987
VIA EMAIL: [email protected]
Matt Gough, P.E.
HDR Engineering, Inc.
419 Canyon Avenue
Fort Collins, CO 80521
Re:

Geotechnical Investigation Report
GRCA 318719: Rehabilitate North Rim Utility Infrastructure Grand Canyon Inner Canyon, Arizona

Mr. Gough:
Submitted herewith is the Geotechnical Engineering Investigation for the Inner Canyon portion of the Grand Canyon National Park Rehabilitate North Rim Utility Infrastructure project. This study was conducted in accordance with our contract between GEI Consultants, Inc. and HDR Engineering, Inc. This report contains the results of our findings, an engineering interpretation with respect to the available project characteristics, and recommendations to aid design and construction of earth-related phases of this project.
If you have any questions regarding the contents of this report, please contact the undersigned. Sincerely,
GEI Consultants, Inc.

Rob D. Johanson, P.E.
Project Engineer

Matt. P. Olson, P.E.
Project Manager

Nate C. Soule, P.E., P.G.
Principal Engineer
www.geiconsultants.com

GEI Consultants, Inc.
350 Indiana Street, Suite 750
Golden, CO 80401
303.625.9502

Geotechnical Investigation Report
GRCA 318719: Rehabilitate North Rim Utility Infrastructure Grand Canyon Inner Canyon, Arizona
August 11, 2025

1.

Introduction and Project Background

2.

Geologic Setting

3.

Geotechnical Investigation

3.1.
3.2.

Field Investigation
Geophysical Investigation

4.

Subsurface Conditions

4.1.
4.2.
4.3.
4.4.
4.5.

Alluvial Deposits
Colluvial Deposits
Bright Angel Formation
Tapeats Sandstone
Groundwater

5.

Geotechnical Observations, Conclusions, and Design
Recommendations

5.2.
5.3.
5.4.
5.5.
5.6.

RSPH Improvements

5.1.1. Power Pole Replacement

5.1.2. Riprap Slope and Rockfall Protection Behind RSPH

5.1.3. New Fire Water Tank

5.1.4. Timber Crib Retaining Wall and Concrete Slab
RSPH Site to Manzanita Ranger Station Power Distribution Cottonwood Campground Site Power Distribution

The beginning of the document. Download the full file to read on.

Other documents in this bid