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<br />... -) <br /> <br />. <br />., <br /> <br />2.2.3 <br /> <br />. <br /> <br />. <br /> <br />supervision of an SRK field engineer to reduce costs. If <br />this is not possible, we will adjust our cost estimate to <br />i nc I ude est imated charges for backhoe work from a 1 oca 1 <br />contractor. We estimate that these additional charges <br />would be approximately $2,700 to $4,000. <br /> <br />Surface Geophysics <br /> <br />Surface geophysical techniques such as self <br />potential (SP), resistivity, seismic refraction and <br />ground penetrating radar, can sometimes provide. data on <br />general embankment and foundation conditions which can be <br />extremely valuable and cost effective when interpreted in <br />conjunction with data from strategical1y placed boreholes <br />and backhoe test pits. Based on our present knowl edge of <br />the site geology, foundation and embankment conditions, <br />we believe that relatively inexpensive SP and resistivity <br />surveys may be applicable at Gurley Reservoir to better <br />define embankment condition, foundation geology and <br />potential high seepage zones. The subsurface profiles <br />generated from these surveys would be used to better <br />defi ne the site geology, deli neate zones of concentrated <br />faulting and fracturing, and highlight areas with <br />possible high concentrations of subsurface voids or <br />relatively high moisture contents. As the applicability <br />of these surface geophysical techniques is a function in <br />I <br />most cases of stratigraphy and antecedent moisture <br />conditions, a final decision on the scope of the <br />geophysical investigation and the techniques to be used <br />will be made following the site geology review and <br />backhoe test pi tt i ng program. If the proposed scope of <br />the geophysical investigation is reduced due to site <br />specific limitations, the scope of the drilling <br />investigations will probably be expanded to compensate. <br /> <br />-7- <br />