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i• <br />• <br /> <br />Monitoring Well W.L.Elevation <br />Well No. (on 9-21-82) <br />(feet) <br />Approximate <br />River W.L.Elevation <br />(feet) <br />Approximate <br />Difference <br />(feet) <br />MW-1 5,705.35 5,696 <br />MW-2 5,727.20 5,689 <br />MW-3 5,721.94 5,672 <br />9.35 <br />38.20 <br />49.94 <br />This situation shows a relatively steep hydraulic gradient <br />toward the river, caused by an intensive recharge of the alluvial <br />aquifer from irrigation ditches, flood irrigation of the orchards <br />and, very probably, by abnormally high precipitation occurring <br />prior to the field investigation. The North Fork Gunnison River <br />is a gaining (effluent) stream at this time of the year <br />{September}. <br />The Mancos Shale underlying the alluvial sediments is <br />known as a very poor water-bearing strata and, therefore, it is <br />assumed that no significant bedrock aquifer is present beneath <br />the alluvial sediments. <br />3.2.3 GROUND WATER QUALITY <br />Three ground water quality samples from monitoring wells <br />MW-1, 2 and 3 were field-measured for the temperature, pH and <br />conductivity; two samples from wells MW-1 and MW-3 were analysed <br />in the laboratory for various parameters. <br />10 <br />GFO-NYDRO CONSULTING, INC. <br />