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[~ <br />3.1.3 CONCLUSIONS <br />Surface water diverted from the North Fork Gunnison River <br />via several irrigation ditches is extensively used for flood <br />irrigation of most of the study area. The use of surface water <br />for flood irrigation affects both the flow and water quality of <br />the North Fork Gunnison River. <br />Because of an only limited agricultural development <br />upstream of the coal loadout and a much more intensive <br />agricultural use of the land downstream of the site, the impact <br />on the water quality of the North Fork Gunnison River is more <br />pronounced downstream from the CWI coal loadout. <br />• 13.2 GROUND WATER HYDROLOGY <br />3.2.1 DATA ACQUISITION <br />The ground water characteristics of the study area were <br />determined during afield investigation consisting of test pit <br />excavations, installation, testing and water sample collections <br />in three ground water monitoring wells. The three monitoring <br />wells installed in alluvial aquifer are located, as shown in <br />Plate 1, along the railroad spur running through the coal loadout <br />facility. A field permeability test, using the falling head <br />method, was performed in all installed we21s. During the <br />excavation of the two test pits the presence of ground water was <br />observed. Water quality samples were collected in monitoring <br />wells MW-1 and MW-3; in the well MW-2 only field measurements of <br />temperature, pH and conductivity were performed. A data summary <br />for the installation of monitoring wells is listed in Table 1. <br />8 <br />GEOi1VDR0 CONSULTING, INC. <br />