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water balance will be recorded as frequently as necessary in order <br />to update the disposal area mass and water balance. Thjs information <br />will include precipitation, evaporation, pumping raties and hours, <br />tailings level, water pond volumes, seepage volume4, and slurry <br />densities. In addition, bi-annual surveys of tfje embankment <br />configuration and disposal area to evaluate incremental and total <br />volumes of deposited tailings will be performed. <br />A rain gauge and evaporation pan will be ilnstalled and <br />maintained in order to monitor the volumes of precipitation and <br />evaporation. This information, combined with a mays and water <br />balance simulation update, will be used in modifying the tailings <br />disposal area operation to suit natural and operatinglconditions. <br />2.4 Hvdrolooic Svstem'~ <br />The objectives of this monitoring program are to identify any <br />changes in the quantity and quality of surface water anti groundwater <br />during the life of the San Luis Project. The monitaring~process will <br />involve four separate aspects: 1) groundwater levels, 2) <br />groundwater quality, 3) surface water quantity, andl 4) surface <br />water quality. <br />Knowledge of changes in the hydrologic environment, together <br />with baseline data already available, will permit evaluation of the <br />hydrologic impacts of the mining operation. <br />2.4.1 Groundwater <br />Groundwater will be monitored at the locatio~s of monitor <br />wells shown on Figure G-1 of the amendment applic tion.~ Seven <br />wells have been established at various levels ib, the area of <br />the tailings disposal area. All but one of the~e wells are <br />currently dry. An additional number of wells have been <br />