B08_Attachment_0007_As-builts_140P5126Q0025_0002.pdf

This document is a technical drawing set for a Mammoth Cavern Elevator Shaft project prepared by USS (United States Structural) and Neely Engineering. The drawings provide comprehensive specifications for the design and construction of an elevator encapsulation and repair project within an existing cavern structure.

The project involves the installation of a temporary work platform on top of an existing elevator shaft for safe work execution and worker encapsulation. Key specifications include the use of stainless steel bolts and hardware (ASTM A325 unless otherwise noted), rock catch cables with a 7/8" diameter 6x19 IWRC cable having a breaking strength of 17,600 lbs, and a rock anchor weighting system. The encapsulation liner must be equal to white Tyvek or equivalent material with a minimum 20-mil thickness, featuring a drain at the bottom with a minimum capacity of 1,500 gallons per hour. The system includes detailed specifications for rock anchor bracing (both typical and big-dig configurations), diasomal brace barrier configurations, and an alternate diagonal tie-back bracing system. The cross-sectional elevator shaft drawings show multiple elevation levels with precise dimension callouts and structural support details. All work must maintain rigorous safety procedures and equipment compliance as specified in the general notes, with provisions for composite site documentation, contractor on-site safety data sheets, and temporary work platform specifications including necessary encapsulation and rock debris protection during scattering operations.