B08_Attach_02_North_Rim_Final_CDs_Volume_05_20261012_Part12.pdf

This file consists of technical construction drawings and design details for drainage and structural improvements at the Roaring Springs Pumphouse located at North Rim, Grand Canyon National Park. The project is prepared by HDR Engineering, Inc., based in Denver, Colorado, with project leads Gough/Glover and J. Glover.

The drawings provide comprehensive technical specifications for civil drain field details, photo documentation of existing piping connections, a structural and geotechnical site plan, and structural details for the pumphouse facility. Key design elements include: a roaring springs drain field with perforated and solid PVC piping systems (4-inch diameter), gravel and stone support materials, landscape filter cloth geotextile materials, a 12-inch reinforced concrete pad foundation with specified bearing capacity, modular aluminum guardrails, wood slab wall construction to extend the existing crib wall to full height, isolation joints between the new pad and slab, cast-in-place pipe sleeves with processed and moisture-conditioned material specifications, and removable guardrail details. The drawings indicate existing structure integration, slope requirements at 2% minimum grade, multiple drainage interconnections to existing process piping and drainage systems, and detailed edge conditions for the concrete slab. The document is presented as sheet 26 of 113 in a larger project set, with drawing numbers referenced as 182752, indicating this is part of a comprehensive design package for facility improvements at the North Rim location.