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Each monitoring well is equipped with a nitrogen gas, air lift <br />i <br />water sampler to obtain water quality samples from a discrete <br />zone. Sand and bentonite are utilized to isolate the sampler. A <br />pressure transducer is placed approximately 20 feet below water <br />level with data recorded continuously at a surface data <br />acquisition system (see Comprehensive Monitoring Plan, Oct. 29, <br />1990 for more details on monitoring). <br />Dedicated Monitoring Wells Immediately Down-Gradient <br />Wells utilized to establish baseline conditions are: <br />Well Aquifer <br />Na26-EX-2 Dissolution Surface <br />Na26-89-1 B-Groove <br />Na26-89-2 A-Groove <br />Na26-89-3 Perched <br />This set of wells was completed in 1989, and samplers/pressure <br />transducers installed in Feb./March of 1990. Therefore, data was <br />obtained prior to ground water pumpage (water well), and mining <br />activities planned for 1991. See Table 2-4 for summary of April- <br />September, 1990 water quality data. <br />The water quality results for wells immediately down-gradient from <br />planned well field indicate three distinct water quality zones. <br />The Perched aquifer is low in TDS (Total Dissolved Solids), <br />conductivity, fluoride, SAR (Sodium Absorption Ratio) and high in <br />35 <br />