B08_Attach_02_North_Rim_Final_CDs_Volume_05_20261012_Part15.pdf

This document is a comprehensive set of construction and engineering drawings for the Roaring Springs Pumphouse (RSPH) at the North Rim of Grand Canyon National Park, prepared by HDR Engineering, Inc. for the National Park Service.

The project encompasses the design of a complete water treatment and distribution facility, including raw water pumping systems, water storage tanks, chemical treatment areas, finished water delivery systems, HVAC systems, plumbing, and electrical infrastructure. Key components include two 450-horsepower raw water pumps with variable frequency drives (VFDs) for pressure control; a finished water storage tank with integrated recirculation and booster pump systems; chemical dosing systems for sodium hypochlorite disinfection; a complete HVAC system with split-system air handling and cooling units; electrical service with a 750-kilovolt-ampere transformer stepping down to 480-volt/277-volt three-phase distribution; and comprehensive instrumentation and control systems via a PLC (programmable logic controller) with redundancy. The facility includes three occupied spaces: a pump room (101), operations room (102), and electrical area (103). Design specifications address water quality monitoring (turbidity, chlorine residual, pH, temperature), pressure control, flow measurement, level sensing, motor protection, and safety systems including emergency eye wash/shower stations and heat trace for pipeline freeze protection. The drawings reference numerous equipment schedules, control sequences, and technical specifications prepared under specification sections 01 33 23 (or equal substitutions) and various mechanical and electrical standards. Project documentation is dated May 2026, indicating a future design completion date.