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sulfate and chloride levels. The pH levels forthe three underburden wells ranged from 7.0 to 9.1. Wells GW-N 13, GW-N 16 and GW-N19 were 7.28, 8.44 and 7.8, respectively. There was a limited amount ofseasonal variability in the chemistry of the underburden aquifer. In comparing spring versus fall chemistry, calcium, magnesium, sodium, potassium and sulfate levels tended to increase in the fall. Fall versus winter chemistry suggested that only calcium levels decreased inthewinter. The only trend when comparingsummerversuswinterchemistrywasan increase in chloride in the winter. Chemical trends over time were also evident in the underburden aquifer during irrigation periods. Well GW-N13 showed an increasing trend in magnesium, sulfate and TDS levels; Well GW-N16 showed an increasing trend in magnesium and bicarbonate levels; and Well GW-N19 showed a decreasing trend in bicarbonate and an increasing trend in magnesium, sodium, sulfate and TDS levels. • Trace elements measured were also measured in the underburden wells. Well GW-N13 water exceeded the CWQCC agricultural standard for manganese and Well GW-N 16 water exceeded the pH standard. WeIIGW-N19watermetallofthestandards. All three wellsmetthelivestockdrinking water standards. Measurable trace element concentrations in the underburden aquifer include aluminum, arsenic, boron, cadmium, copper, fluoride, iron, lithium, manganese, mercury, nitrate, vanadium and zinc. The highest concentrations of arsenic, mercury and copper were measured in the underburden aquifer at the New Horizon 2 mining area. Srins There are no definable springs at the New Horizon 2 mining area. Ground Water Suitability Present Ground Water Use. Ground water rights within the immediate region (2 mile radius) around the New Horizon Mine are presented in Appendix 2.04.7-1 of this permit section. Some of (REVISED 6/28/01) 2.04.7-17