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White River Nahcolite Minerals <br />Up-dip monitoring wells 90-2, 90-3, 90-4 and IRI-1 will continue to be sampled at the <br />same frequency as in the past. For example, water quality sampled montlily for field <br />parameters, quarterly for lab a~)alysis and annually for complete lab analysis. See <br />attaclunent munber 1 for plots of select water quality parameters wlvch indicates little <br />change for the past two years. Water level will be continuously recorded. A total of six <br />wells including BG-1 alui DS-2 are up-dip and near the current mining operation. <br />Inside mining panel #l, two wells (93-2M and 3A-1 V) have been completed for <br />contuiuous motoring of the Dissolution Surface (DS) aquifer. hi addition, DS wells <br />90-2, Ex-2 acrd DS-2 provide water level data, for total of five wells close to the mining <br />operation and completed in the aquifer most responsive to mining activity. Continuous <br />data from the five wells is available in the control room of the facilities, wluch provides <br />information for adjustment of mining injection and recovery rates. <br />Down-dip monitoring wells EX-2, 89-1, 89-2, and 89-3 will continue to provide <br />colrtuiuous water level readings. However, based on water quality results for the past <br />two to five years no significant water quality changes have been detected. Therefore, <br />water quality sampling for lab a~ialysis will be reduced to quarterly. See attaclunent <br />number 2 for plots of select water quality parameters for each down dip well. <br />At the remote wells IRI-4, IRI-5, IRI-6, IRI-7 and IRI-8, the water level monitoring <br />schedule will not change. The water quality has not changed significantly in the past two <br />to five years,.therefore WRN proposes sampling water quality quarterly (every three <br />months) for field'analysis and semi-annually (six months) for major lab_analysis. Water <br />quality sampling for IRI-£i would be sampled annually for minor lab analysis. See <br />attachment number 3 for plots of select water.quality parameters. Water quality for the <br />Wlilts,' Rlvir NhcolYt~ Mln~rsl~,"Llmltid:Llabll~ty Company,: <br />.. P. O.Dr~wir 72,3200 Co::Rd.31, Rifls, CO ~Bi6e0'.;~(tN) 670re76.3e7~ iii^) e7o-e7&seee <br />