Improved techniques for monitoring well screen placement and well location.

摘要

One of the prime objectives for using monitoring wells in hazardous waste investigations is to collect water quality data representative of actual aquifer conditions. It is important that the horizontal and vertical placement of well screens be chosen to yield the most beneficial analytical data. The problem of optimal well placement is confounded by the lack of analytical data available during well installation. To compensate for the lack of information, many hydrogeologists either randomly place wells or align wells in an upgradient-downgradient alignment with respect to a specific source area. There are several drawbacks to this approach. This paper presents field methods that allow the investigation to vertically place the screened interval and horizontally locate the monitoring well during one mobilization so that maximum benefit can be obtained. Specifically, a case study is presented in which a plunging plume 2500 ft wide, 8000 ft long, and 35 ft thick in an unconfined aquifer was accurately defined in one field mobilization. 1 tab.