Geologic mapping of the air intake shaft at the Waste Isolation Pilot Plant

Technical Report · Fri Nov 30 23:00:00 EST 1990

DOI:https://doi.org/10.2172/5492393· OSTI ID:5492393

Holt, R M; Powers, D W ^[1]

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1. IT Corporation (USA)

The air intake shaft (AS) was geologically mapped from the surface to the Waste Isolation Pilot Plant (WIPP) facility horizon. The entire shaft section including the Mescalero Caliche, Gatuna Formation, Santa Rosa Formation, Dewey Lake Redbeds, Rustler Formation, and Salado Formation was geologically described. The air intake shaft (AS) at the Waste Isolation Pilot Plant (WIPP) site was constructed to provide a pathway for fresh air into the underground repository and maintain the desired pressure balances for proper underground ventilation. It was up-reamed to minimize construction-related damage to the wall rock. The upper portion of the shaft was lined with slip-formed concrete, while the lower part of the shaft, from approximately 903 ft below top of concrete at the surface, was unlined. As part of WIPP site characterization activities, the AS was geologically mapped. The shaft construction method, up-reaming, created a nearly ideal surface for geologic description. Small-scale textures usually best seen on slabbed core were easily distinguished on the shaft wall, while larger scale textures not generally revealed in core were well displayed. During the mapping, newly recognized textures were interpreted in order to refine depositional and post-depositional models of the units mapped. The objectives of the geologic mapping were to: (1) provide confirmation and documentation of strata overlying the WIPP facility horizon; (2) provide detailed information of the geologic conditions in strata critical to repository sealing and operations; (3) provide technical basis for field adjustments and modification of key and aquifer seal design, based upon the observed geology; (4) provide geological data for the selection of instrument borehole locations; (5) and characterize the geology at geomechanical instrument locations to assist in data interpretation. 40 refs., 27 figs., 1 tab.

• Research Organization: Westinghouse Electric Corp., Carlsbad, NM (United States). Engineering and Repository Technology Dept.
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-86AL31950
• OSTI ID: 5492393
• Report Number(s): DOE/WIPP-90-051; ON: DE91017780
• Country of Publication: United States
• Language: English

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ALKALINE EARTH METAL COMPOUNDS
ANHYDRITE
BRINES
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCIUM SULFATES
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CLAYS
CREEP
DOLOMITE
FUNCTIONAL MODELS
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC FRACTURES
GEOLOGIC STRATA
GEOLOGIC STRUCTURES
GEOLOGIC SURVEYS
GYPSUM
HALIDE MINERALS
HALITE
LITHOLOGY
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MANAGEMENT
MAPPING
MATERIALS
MECHANICAL PROPERTIES
MINERALS
MORPHOLOGY
NATIONAL ORGANIZATIONS
NUCLEAR FACILITIES
OXYGEN COMPOUNDS
PERMEABILITY
PILOT PLANTS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE FACILITIES
RADIOACTIVE WASTES
SALT DEPOSITS
SALT VAULT PROJECT
SALTS
SHAFT EXCAVATIONS
STORAGE FACILITIES
SULFATE MINERALS
SULFATES
SULFUR COMPOUNDS
SURVEYS
UNDERGROUND DISPOSAL
UNDERGROUND FACILITIES
US DOE
US ORGANIZATIONS
VENTILATION
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
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