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Title: Multiple-port piezometer installation at Rocky Mountain Arsenal
Authors: Rocky Mountain Arsenal (Colo.)
U.S. Army Toxic and Hazardous Materials Agency.
Vispi, Mark A.
Keywords: Groundwater
Observation wells
Rocky Mountain Arsenal
Hazardous waste sites
Issue Date: Aug-1980
Publisher: Geotechnical Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; GL-80-12.
Description: Miscellaneous Paper
Abstract: This report documents the installation of multiple-port piezometer casing in two borings at the Rocky Mountain Arsenal (RMA) in Denver, Colo. The purposes of the installation were to determine the feasibility of monitoring and sampling groundwater at multiple levels in a single borehole, to compare the installation costs of this type system to the costs of installing open system observation wells, and to compare the chemical analysis data on groundwater samples obtained through the system to the chemical data on groundwater samples obtained through adjacent open system observation wells that are currently being used at RMA. The report describes the component parts of the system installed at RMA along with the installation procedure. A cost comparison between the multiple-port system and the observation well system is made and formulas are presented that can be used to compute the installation costs of both the multiple-port system and the observation well system for varying numbers and depths of ports. A limited number of groundwater samples taken through the system precluded a meaningful comparison of the chemical analysis data between groundwater samples obtained through the multiple-port system and those obtained through the adjacent observation well system. The piezometric pressure readings obtained from both systems compared very favorably. Generally, in situations requiring few ports at shallow depths, an observation well system or cluster is more economical than the single borehole multiple-port system. In situations involving numerous ports at deep monitoring locations, the multiple-port system would be more economical.
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