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<br />' clay layer was absent and the monitoring wells wE~re completed <br />in the Precambrian gneiss beneath the Santa Fe Conglomerate. <br />' Generalized details of the construction of these wells are <br />shown on Figure G-2. <br />' Water level information from these monitoring wells has <br />been obtained during each monitoring period. Water levels <br />obtained in November 1987 are plotted and contoured on Figure <br />G-9. <br />' As the data show, water levels in the East and West Pits <br />' are somewhat consistent with creek levels in Rito Seco in the <br />immediate vicinity. It appears that the water in the East Pit <br />is, to some degree, hydraulically connected to Rita Seco, while <br />' water beneath the green clay layer in the West P~t is either <br />poorly hydraulically connected to Rito Seco, or is a <br />' hydraulically distinct unit locally. <br />' Water quality in both pit areas shows significantly <br /> different water quality from that observed in the surface <br /> flows. This would indicate poor, or no, hydraulic connection <br />t between the two systems locally. However, in the case of the <br /> east ore zone, this may also be indicative of low <br />' permeabilities and, thus, long residence times. The water level <br /> data in the Santa Fe Conglomerate indicate a hydraulic <br />~ <br />' _ <br />interconnec ion a ween the Rito Seco and the Santa Fe <br /> Conglomerate in the vicinity of the Rito Seco. At distances <br />1 away from the creek, water levels in the Santa Fe decline <br /> signs scant y. n the plant and leach pad areas, water has <br /> been encountered during drilling at depths greater than 400 <br /> ft. <br />' Water quality in the Santa Fe Conglomerate mire closely <br />resembles that found in the Precambrian rock aquifer than that <br />' found in the Rito Seco and may be related to low hydraulic <br />conductivity in the Santa Fe Conglomerate which would result <br />' G-30 <br />