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;. in 1993, a large increase from 1992. Well GMP-1 had a value of 8.9 <br />in 1993, down from 16.1 in 1992. <br />A SAR of greater than 15 will result in an alkali build-up on <br />most soils and, therefore, will not be an acceptable irrigation <br />source. Some ground water naturally has a high SAR. Ground water <br />systems at Trapper mine do not yield an adequate rate for <br />irrigation and, therefore, are not very likely to be considered as <br />a potential source. <br />3.5 NHa AND N03 <br />Concentrations of ammonia and nitrate are presented in <br />Appendix B, pages B-120 to B-14DJ. These constituents generally <br />decreased in 1993, most likely in response to increased recharge. <br />Wells GE1, GF2, GF3, GP1, GP2, and GP9 all demonstrated NHs <br />decreases back into their normal ranges. The 1992 NHa <br />concentration £or well GP9 may have been a data outlier rather than <br />valid data. Wells GB5, GP7, P3, and COY showed NOa decreases to <br />normal ranaes. These wells were among those about which the <br />Colorado Division of Minerals and Geology expressed concern at <br />elevated levels of NHs and NOs in comments on the 1992 annual <br />report. Well P3"s steep decline in N03 from 1992 to 1993 should be <br />viewed with caution until additional data points confirm the low <br />concentration. Well P8 had a NOa concentration of 8.2 mg/1 in <br />1993. up from 3.9 mg/1 in 1992, but is still within a natural <br />range. This well will be closely monitored. No mine-related <br />. sources of N03 have been identified. The fact that the wells on <br />3-13 <br />