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<br />i' Grand !unction Pipc <br />Surficial Geology Investigation, Bean Ranch Road, Gravel Pi[, 1Yhitewater, CO <br />Februan IR,199R Page3 <br />' drainage to this site but, ma} accept some drainage from this site. The site is not located within mapped or <br />suspated Good plains. The flood plains of Indian Creek to the south and Kannah Creek to the north are between <br />RO to IGO feet below the elevation of this tract. <br />t ECONOMIC GEOLOGIC DEPOSITS <br />' Thc significant ewnomic deposit on this site is the alluvial gravels and cobbles. Portions of this ridge have been <br />mined in the past, most notably in conjunction with construction of US Highway 50 and the DOE Mill Tailings <br />Hall Road to Cheney Reservoir disposal site. <br />' No other knovvm, economic deposits of petroleum, other potential quarry type rocks or minerals are known to <br />exist in this arcs. <br />' GEOLOGIC HAZARDS <br />In general, this sift in itself does not appear to contain any goologic htverds. Thc underlying clays of the Mancos <br />' Shale Formation exhibit expansive characteristics but, such expansive characteristics should not atPect the gravel <br />extraction operation. <br />I' Thc side slopes off of this ridge, to the north and south are moderately steep. These side slopes are complicated <br />by the Smith Ditch which is an unlined imgation ditch. This unlined imgation ditch is in useprimarily in the <br />spring and early summer months. Numerous areas of soil creep and slope failure complex features are evident <br />' on the north slope. bclrnv this proposed gravel extraction pit. Lessprominent slope failure feotures ere present <br />on the south facing slope, overlooking Indian Creek. [n its self, the gravel extraction operation on this property <br />should not a(Tcet the stability of these slopes, either in n positive or negative manner. The primary mechanism <br />' affecting these slope failures is the leakage, whether intentional or unintentional, from Smith Ditch. It is <br />rewmmended that high banks or slopes not be constructed or allowed to remain immediately above Smith Ditch. <br />It would be advantageous, near the end of the gravel extracting operation, to cut back any banks on the north, <br />west and cast sides of the proposed gravel pit. The purpose of cutting Ihcsc banks back would be to, vvhcre <br />' possible, remove the vvcight of the grace) and soil from above the ditch, aiding in stability of these slopes. <br />1 <br />1 <br />1 <br />1 <br /> <br />