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drilling records from water wells, geotechnical, mineral exploration, and hydrogeological studies provide subsurface information for regional geological and hydrogeological investigations. This paper evaluates methods by which water well material descriptions may be standardized. In Ontario, material descriptions are reported in three attribute fields using 82 terms, thus theoretically permitting over 500 000 permutations. Materials descriptions are rationalized to ten classes then reclassified according to two methods, 1) first-attribute method (FAM), and 2) rule-based method (RBM). The first-attribute method is presently applied by hydrogeologists in southern Ontario and uses only the first attribute field; it is a simple, effective method able to broadly delimit aquifers and nonaquifers. The rule-based method applies conditional rules developed from regional geological models. This method is more geologically accurate, and is recommended where water well data are to be integrated into geological and hydrogeological investigations. Successful applications are summarized and general recommendations made.

Standardization and assessment of geological descriptions from water well records, Greater Toronto and Oak Ridges Moraine areas, southern Ontario