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. ~ <br />-z- <br />could be obtained. When the highest seasonal ground <br />water levels have been determined, a watertable con- <br />tour map can be prepared to aid in determining the final <br />elevations for extracting gravel. <br />3 . Due to capillary rise and a shallow water table, eva- <br />poration can still occur even though the water table is <br />not exposed. Research at Colorado State University <br />(Hydrology Paper No. 7, 1965) has indicated that eva- <br />poration from the water table can occur in a fine sand <br />if the water table is at a depth less than 24 to 30 inches <br />below the soil surface. Depending upon the gradation <br />of the material in this mining operation, it would appee,r <br />that the final elevation of the land surface should be <br />kept approximately 2 to 3 feet above the highest ex- <br />pected water table elevation. <br />4. No discussion was provided on any water requirements <br />related to mining or re mation. ~/ ,/ <br />J ris A. Danielson <br />JAD/HDS; mvf <br />cc: W. Wilkinson, Div. Eng. <br />