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., <br />ZORICH - ERKER ENGINEERING, INC. <br />Introduction <br />Page 2 <br />The proposed open pit mine is located on a slump block formed <br />due to down faulting along the north flank of Monogram Mesa. The slump <br />block itself is faulted in many places further offsetting the ore pro- <br />ducing zones which occur in the Salt Wash manber of the Nnrrison formation <br />and isolating them relative to other productive zones. This faulting <br />and subsequent offsetting of ore horizons relates directly to the occur- <br />rence of groundwater in the area of the proposed mine, causing in general, <br />isolated saturated sandstone beds. <br />The surface water system in the area of the mine consists of <br />several intermittent streams which only have flow during the wet periods <br />of the year and after unusually heavy rains. The main stream is located <br />approximately 2 miles to the north of the proposed mine and is itself <br />intermittent. Thus, there is no significant surface flow in the area <br />which will be disrupted by the mining operation. It is also understood <br />that berms will be used to divert any surface water inflow away from the <br />proposed pit, thus, el; m;nating any surface water contribution to the <br />pit inflow rate. <br />At present, due to the infrequent occurrence of both surface <br />water and groundwater and the fact that very little, if any, of this water <br /> <br />ever reaches active surface streams, there are no water using activities <br />that would be affected by the proposed open pit mine. <br />Geology and Hydrology <br />The geologic units present in the area of the proposed pit mine <br />are as follows from youngest to oldest: Recent alluviwn and oolluviian <br />deposits, Dakota sandstone, Burro Canyon formation, Nbrrison formation <br />