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<br />lhnlryllryll' INYII i~Y llC, ~a:a ()iNJNI 1(Illy' <br />irrieation pe:iod. The underburden he!uw the Dakum Cual scams .vas monitored at .ve!Is <br />GW_>11.U. GW-N;tiPl. Gw-N L9. and GW-V33. Water im(eis varied with tha irrieation <br />season similar ro ::e upper aquifers. The variation was between . to 3 Feet with well GW- <br />~I3a being artesian during the peak irrgution period. <br />Groundwater quality data collected for the I'_' wells in the area of the Vew Horizon blrne <br />3 are contained in appendix E A summary of conductivity, Ph, [emperature and dissolved <br />solids for the non-irrigation and irrigation seasons is contained in Table 5 with tnlinear and <br />stiff diagrams contained in Appendix F. Well completion and aquifer test data are contained <br />in Appendix G. <br />Water quality in the Calamity Draw alluvium as monitored at well GW-N33 is a mixed <br />aalcium/magncsium-sulfate type water. The ionic balance of this well does not change during <br />the shift from the non-irsigadon season to the irrigation season. The field parameter and <br />TDS as summarized on Table 5 arc also consistent for both periods. Water quality of the <br />overburden as monimred ac the three we31 situ is variable. Qualirv of well GW-Y15 is a <br />strong magnesium-sulfate while wells GW-~i18P1 and GW-;121 are a mixed talci- <br />um/magnesium-sulfate type water. Only well GW-Y21 axhibits a shift in wacer chemistry <br />• from the non=trrigadot season (magnesium-sulfate) to cite irrigation season (calcium-sulfate). <br />A slight shift in water quality is also ipdipted by the Held parame[ers and TDS values <br />indicated at well GW-N18P1 (Table 5). Water quality in the Dakota Coal is aLsa variable. <br />Wells GW-Yld and GW-N17P1 exhibit a strong sodium-sulfate type water whsle weps GW- <br />N20 and GW Y30 are mined calcium/magnesium-sulfate. There is a minor shift in water <br />quality during the irrigation with some increases in magnesium levels. Field parameters and <br />TDS values of the coal wells do not indicate shifts durne the two seasons (Table i). All <br />three of the coal wells exhibit a lower Ph than other wells with the water being on the acidic <br />side of the scale. Water quality in the underburden is slightly variable with the water being <br />a mixed magnesium/ealcium-sulfate type water. At site 1G the only chemistry which trould <br />be found in the data base was for well GW-N16. This well was n strong sodium-bicarbonate <br />ape water. In the other three welts, there is a minor shift in the quandcies of magnesium <br />and calcium from [he non-irrigation season to the irrigation season FEeid parameters and <br />TDS values remain the same between the two seasons (Table 5). <br />Table 3 shows the water quality standards for livestock. drinking water. and agricultural <br />standards for Colorado. Groundwater monitoring wells had minor exceedances of iron <br />and/or manganese for drinking water smndards in all of the wells. <br />Livestock standards were not e:cceeded in any of ehe wells tluring [he sample period. <br />Drinking water standards for imn manganese. and sulfate were exceeded at wells GW-V 19 <br />(underburden),GW YZO(Dakocacoal),andGW-NZl(overburden). ~IonicoringwellsGW- <br />N19 and GW-V30 also faled drinking ware: uandards for the ammonia-nitrogen standard. <br /> <br />Attachment 2.04.7-5-10 <br />