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Last modified
1/26/2010 4:14:26 PM
Creation date
10/12/2006 5:29:11 AM
Metadata
Fields
Template:
Water Supply Protection
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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<br />I ~.o <br /> ) <br />I t'- <br />CJ <br />';:'.J <br /> i:;) <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Results of the aquifer testing of the Carroll Well and the Owens Well are <br />thought to be representitive of HSU-2 and the upper several hundred feet of <br />HSU-3. This is expected due to confirmation by geophysical logging of the <br />depths from which water is produced in the 2620-foot deep Carroll Well. Since <br />water from the Owens Well and the Carroll Well flow at the same temperature <br />and at nearly the same specific conductance, it is likely that they produce <br />water from almost the same portions of HSU-2 and HSU-3, <br /> <br />Figure 2.5 is a graph of normalized time versus flow-rate data collected <br />during the flow test of the Carroll Well. Based upon the best-fit (linear <br />regression) line through these data, the transmissivity was calculated to be <br />approximately 13,900 gpd/ft for HSU-2 and the upper several hundred feet of <br />HSU-3 (Appendix A). <br /> <br />The straight-line approximation time versus head-recovery plot for the <br />one-hour recovery period at the Carroll Well (Figure 2.6) indicates a <br />transmissivity of approximately 4900 gpd/ft (Appendix A). A graph of residual <br />drawdown versus time (Figure 2.7) indicates a transmissivity of approximately <br />4500 gpd/ft (Appendix A). <br /> <br />The values of T for HSU-2 calculated from the Carroll Well test are a <br />factor of approximately 10 to 20 less than expected (Emery et al, 1973). The <br />reason for this may be that the Carroll Well casing slots are partially <br />plugged due to corrosion or encrustation, or possibly that the well had never <br />been developed (cleaned) adequately after it was drilled. <br /> <br />2.3 GEOPHYSICAL LOGGING <br /> <br />2.3.1 Hooper Pool Well Logging <br />An attempt was made to run borehole temperature and fluid-resistivity <br />logs in the Hooper Pool Well on August 25, 1986. The purpose of the logging <br />was to characterize the water quality of HSU-2 and HSU-3 in the Hooper area. <br />At a depth of approximately 165 feet, a casing restriction was noted due to <br /> <br />2-4 <br />
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