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Title: Instructions for borehole sampling

Geologic systems generally are complex with physical properties and trends that can be difficult to predict. Subsurface geology exerts a fundamental control on groundwater flow and contaminant transport. The primary source for direct observation of subsurface geologic information is a borehole. However, direct observations from a borehole essentially are limited to the diameter and spacing of boreholes and the quality of the information derived from the drilling. Because it is impractical to drill a borehole every few feet to obtain data, it is necessary to maximize the data gathered during limited drilling operations. A technically defensible balance between the customer`s data quality objectives and control of drilling costs through limited drilling can be achieved with proper conduct of operations. This report presents the minimum criteria for geologic and hydrologic characterization and sampling that must be met during drilling. It outlines the sampling goals that need to be addressed when drilling boreholes, and the types of drilling techniques that work best to achieve these goals under the geologic conditions found at Hanford. This report provides general guidelines for: (1) how sampling methods are controlled by data needs, (2) how minimum sampling requirements change as knowledge and needs change, and (3) whenmore » drilling and sampling parameters need to be closely controlled with respect to the specific data needs. Consequently, the report is divided into two sections that center on: (1) a discussion of basic categories of subsurface characterization, sampling, and sampling techniques, and (2) guidelines for determining which drilling and sampling techniques meet required characterization and sampling objectives.« less
Authors:
;
Publication Date:
OSTI Identifier:
10103751
Report Number(s):
WHC-SD-EN-AP--181
ON: DE95003857; TRN: 95:000399
DOE Contract Number:
AC06-87RL10930
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 11 Nov 1994
Research Org:
Westinghouse Hanford Co., Richland, WA (United States)
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES; BOREHOLES; RECOMMENDATIONS; GEOLOGIC STRUCTURES; SAMPLING; SITE CHARACTERIZATION; ROCK DRILLING; GEOCHEMISTRY 440700; 580000; 540250; GEOPHYSICAL AND METEOROLOGICAL INSTRUMENTATION; GEOSCIENCES; SITE RESOURCE AND USE STUDIES