WSP12268

• File Number: 8509
• Description: San Luis Valley
• State: CO
• Basin: Rio Grande
• Water Division: 3
• Date: 6/1/1987
• Title: Interim Task 5 Report Deep Well Testing & field Investigation - San Luis Valley Confined Aquifer Study - Phase 1
• Water Supply Pro - Doc Type: Report/Study

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2.0 DEEP-WELL TESTING AND LOGGING

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2.1 INTRODUCTION
Aquifer testing and geophysical logging of four confined-aquifer wells
was performed and supervised by members of the Phase IA study team during the
week of August 24, 1986. The logging and testing was performed on wells
selected during the deep-well inventory part of the confined aquifer study
(see Interim Task 2 Report, this study). The four wells, which are depicted
on Figure 2.1, are as follows:
1. Hooper Pool Well (reported total depth of 4308 ft.)
2. Carroll Well (reported total depth of 2585 ft.)
3. Owens Well (reported total depth of 3080 ft.)
4. Alamosa Geothermal Well (reported total depth of 6084 ft.)

The purpose of the logging and testing was to supplement the existing
database regarding the aquifer characteristics and water quality of the deep
confined aquifer, particularly hydrostratigraphic unit 3 (HSU-3).

Flow tests and/or shut-in tests were performed on the Hooper Pool Well,
the Carroll Well, and, to a limited extent, the Owens Well. The Alamosa
Geothermal Well was not tested, because it does not flow, and because it is
doubtful whether a pumping test of that well would yield reliable aquifer
parameters due to indications of inadequate well development following
drilling and well completion.

Geophysical logs were run in the Carroll Well and the A1amosa Geothermal
Well. No logs were run in the Owens Well, due to its proximity (1880 feet)
to the Carroll Well, and because logging would have caused several dozen homes
and businesses to be without water for the duration of the logging. An
attempt to log the Hooper Pool Well was only marginally successful due to
problems with the condition of the well.

2-1