B08_Attach_02_North_Rim_Final_CDs_Volume_09_20261012.pdf

This document is a comprehensive set of construction design drawings for the Rehabilitate North Rim Infrastructure project at Grand Canyon National Park, specifically Volume 9 (Power Distribution – North Rim) and Volume 92 (Power Distribution Center). The project, managed by HDR Engineering, Inc. in Denver, Colorado, encompasses detailed architectural, structural, mechanical, electrical, and SCADA network plans for upgrading the North Rim's power distribution system and constructing a new power distribution center with generator building facilities.

The scope includes demolition of existing power distribution equipment across multiple areas (North Rim Lodge, Concessionaire, Gas Station, and Entrance Station areas), installation of new electrical equipment and transformers (T-1 through T-68), replacement of junction enclosures and switchgear, and construction of a new power distribution center featuring four 750 kVA diesel generators, associated fuel storage systems (20,000-gallon bulk tank and 400-gallon day tank), HVAC systems, and comprehensive electrical switchgear (SWGR-1). The project includes medium voltage power cable installation between various equipment stations, fiber optic network routing for SCADA communications, and hazardous area electrical classifications for fuel system components. The design drawings dated August 2026 provide specifications for equipment installation, grounding systems, panel schedules, control wiring, and network enclosure layouts, with structural support details for concrete pads and equipment foundations to accommodate seismic and wind load requirements per IBC 2024 standards and National Park Service criteria.