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PROJ00017
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Last modified
11/19/2009 11:22:21 AM
Creation date
10/5/2006 11:29:42 PM
Metadata
Fields
Template:
Loan Projects
Contract/PO #
C153631
Contractor Name
Beaver Reservoir Company
Contract Type
Loan
Water District
59
County
Gunnison
Bill Number
FSA
Loan Projects - Doc Type
Contract Documents
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<br />~..,..-\ <br />) <br /> <br />WoodwardoClyde <br />Consultants <br /> <br />surface geophysical techniques is a function in most cases of stratigraphy and antecedent <br />moisture conditions, a final decision on the scope of the geophysical investigation and <br />the techniques to be used will be made based on pool level and the site geology review. <br />If the proposed scope of the geophysical investigation is reduced due to site specific <br />limitations, the scope of the drilling investigations will probably be expanded to <br />cempensate. <br /> <br />SP will be used to investigate fluid seepage. SP surveys allow the measurement of <br />ambient voltages and voltage variations within the ground. These small voltages <br />(measured in millivolts) are generated by subsurface fluid, heat, or ion flow. For <br />engineering applications, recording the SP variations allows delineation of fluid flow in <br />the vicinity of dams, reservoirs, wells, faults, or lined ponds. There are numerous works, <br />both published and unpublished, regarding the application of SP methods in evaluating <br />the integrity of engineered structures and potential seepage. Additionally, the method <br />has been used by the U.S. Bureau of Reclamation in numerous dam investigations. <br /> <br />The SP method simply involves recording the ambient voltage generated by subsurface <br />currents between two electrode locations connected by a wire to a millivoltmeter, and <br />is thus a passive method. Readings are made along a profile or grid, and results are <br />plotted and contoured. In engineering applications, SP anomalies of interest are usually <br />generated by flows of fluid and ions through a porous media such as soil or rock. The <br />amplitude of SP anomalies in engineering targets may exceed 1,000 millivolts (mv), <br />although for most dam investigations magnitudes of tens to hundreds of mv are more <br />co=on. <br /> <br />Variations in subsurface resistivities, which can significantly effect the observed SP <br />values, will be measured using resistivity soundings. The resistivity sounding methods, <br />which uses an active current source, allows a resistivity versus depth profile to be <br />determined. This information is valuable in helping to constrain the SP data <br />interpretation. <br /> <br />SP data will be along several profiles along Beaver Dam. Coverage will include the <br />upstream dam face, dam crest, and the downstream face. Resistivity soundings will be <br />l!ompleted at a minimum of three locations, to aid the SP interpretation. Data reporting <br /> <br />92D217P1PZ:7 06-:5-Q1(ll :43pmJIPRO/S4 <br /> <br />-~- <br />
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