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Environmental Health - Toxic Substances

Bibliography

U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Colorado Springs, Colorado, September 20-24, 1993, Water-Resources Investigations Report 94-4015

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Field Instrumentation for Multilevel Monitoring of Hydraulic Head in Fractured Bedrock at the Mirror Lake Site, Grafton County, New Hampshire

by

Paul A. Hsieh (U.S. Geological Survey, Menlo Park, CA), Richard L. Perkins (U.S. Geological Survey, Bow, NH), and Donald O. Rosenberry (U.S. Geological Survey, Lakewood, CO)

Abstract

An adjustable and removable instrument, consisting of commercially available components, was developed for monitoring hydraulic heads at several depth intervals in bedrock wells. The intervals are isolated from each other by packers. Each interval is connected to an open pipe, so that the water level in the pipe equals the hydraulic head in the interval. The water levels are monitored by a potentiometer-float system and automatically recorded by a datalogger. The water levels are also measured manually by a water-level probe to check periodically the automatic measurements. The hydraulic-head monitoring instrument can be removed from the well to accommodate activities such as geophysical logging, water sample collection, or hydraulic testing. This instrumentation has been installed at 12 bedrock wells at the Mirror Lake site.

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