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

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 mappingmore » 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.« less
Authors:
;  [1]
  1. (IT Corporation (USA))
Publication Date:
OSTI Identifier:
5492393
Report Number(s):
DOE/WIPP-90-051
ON: DE91017780
DOE Contract Number:
AC04-86AL31950
Resource Type:
Technical Report
Research Org:
Westinghouse Electric Corp., Carlsbad, NM (United States). Engineering and Repository Technology Dept.
Sponsoring Org:
DOE; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 58 GEOSCIENCES; GEOLOGIC FRACTURES; MORPHOLOGY; RADIOACTIVE WASTES; UNDERGROUND DISPOSAL; SHAFT EXCAVATIONS; GEOLOGIC SURVEYS; LITHOLOGY; WIPP; MAPPING; ANHYDRITE; BRINES; CLAYS; CREEP; DOLOMITE; GEOLOGIC FORMATIONS; GEOLOGIC STRATA; GEOLOGIC STRUCTURES; GYPSUM; HALITE; PERMEABILITY; SALT DEPOSITS; SALT VAULT PROJECT; SALTS; STORAGE FACILITIES; VENTILATION; ALKALINE EARTH METAL COMPOUNDS; CALCIUM CARBONATES; CALCIUM COMPOUNDS; CALCIUM SULFATES; CARBON COMPOUNDS; CARBONATE MINERALS; CARBONATES; FUNCTIONAL MODELS; GEOLOGIC DEPOSITS; HALIDE MINERALS; MAGNESIUM CARBONATES; MAGNESIUM COMPOUNDS; MANAGEMENT; MATERIALS; MECHANICAL PROPERTIES; MINERALS; NATIONAL ORGANIZATIONS; NUCLEAR FACILITIES; OXYGEN COMPOUNDS; PILOT PLANTS; RADIOACTIVE MATERIALS; RADIOACTIVE WASTE FACILITIES; SULFATE MINERALS; SULFATES; SULFUR COMPOUNDS; SURVEYS; UNDERGROUND FACILITIES; US DOE; US ORGANIZATIONS; WASTE DISPOSAL; WASTE MANAGEMENT; WASTES 052002* -- Nuclear Fuels-- Waste Disposal & Storage; 580000 -- Geosciences