GUIDELINES FOR CORE LOGGING

Chapter 10 GUIDELINES FORCORE LOGGINGT hese GUIDELINES incorporate procedures and methodsused by many field offices and are appropriate for"standard" engineering geology/geotechnical log forms,computerized log forms, and many of the modified logforms used by various Bureau of Reclamation(Reclamation) chapter describes the basic methods for engineeringgeology core LOGGING and provides examples andinstructions pertaining to format, descriptive data, andtechniques; procedures for working with drillers to obtainthe best data; caring for recovered core; and water testingin drill holes. The chapter also provides a reference forexperienced loggers to improve their techniques and trainothers. Most of the discussions and examples shownpertain to LOGGING rock core, but many discussions applyto soil core LOGGING , standard penetration resistance logs,and drive tube sample , Use, and Importance of Quality CoreLoggingThe ability of a foundation to accommodate structureloads depends primarily on the deformability, strength,and groundwater conditions of the foundation remediation of a hazardous waste site can beformulated only by proper characterization of the and accurate portrayal of geologic design andevaluation data and analytical procedures is reported in geologic logs not only must be accurate,FIELD MANUAL250 consistently

ground structures and are coming into common use for other structures as well. If these methods are used, the necessary data must be collected during core logging. If hazardous waste site characterization is the primary purpose of the drilling, the log should concentrate on providing data for that type of investigation.

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