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SUNDAY MINE COMPLEX-HYDROGEOLOGIC REPORT <br /> 10.1 Monitoring Activities <br /> Groundwater elevation and water quality monitoring of wells MW-SUN1, MW-SUN2, MW-SUN3 <br /> and MW-TPZ1 is being conducted at the SMC to comply with DRMS MRRs, maintain <br /> compliance with CDPHE BSGW rules, and support permitting requirements for the BLM. No <br /> groundwater level or quality data have been collected from well MW-TPZ1, as it has remained <br /> dry since it was installed. A summary of monitoring/sampling events is shown in Table 10-1. As <br /> the table indicates, a total of seven quarterly sampling events have been conducted at all <br /> monitoring wells. PRM restarted the quarterly sampling program beginning in the fourth quarter <br /> of 2019 ahead of the planned resumption of mining in 2020. Water levels were also measured <br /> at accessible vent shafts and one water quality sample was obtained from Vent Shaft S-8. <br /> Early sampling of the monitoring wells, prior to September 2013, was conducted using a <br /> nitrogen lift Bennett Sampling Pump, the same pump used to conduct well development after <br /> initial air lifting by the drilling contractor. Because of the low yield of groundwater to the wells, <br /> BESST Inc. Blatypus low-flow pump systems were installed in wells MW-SUN1 and MW-SUN2 <br /> in September 2013. The BESST systems are nitrogen lift systems designed for low-flow <br /> sampling procedures, where purging of the well will not be conducted. Well MW-SUN3 is still <br /> sampled using the Bennett pump. <br /> The BESST pump systems are customized for each well. The system consists of a plastic <br /> (Delrin) pump housing containing a dual valve system; a lower foot valve and upper shoulder <br /> valve. The pump is connected to the surface by two continuous lengths of tubing (nylon or high <br /> density polyethylene). One line of the tubing conveys nitrogen gas to pressurize the pump and <br /> activate the valves. The other tubing is the water return. A third tubing, the drop tube, can be <br /> connected to the bottom of the pump to the desired depth of water intake. A control unit allows <br /> the operator to vary the pumping cycle. When the gas is turned off, the system recharges with <br /> water. When the gas is on, the valves are activated and the gas pressure pushes water up the <br /> return line to the surface. <br /> 10.2 Hydraulic Testing <br /> Slug tests were conducted at wells MW-SUN1 and MW-SUN2 in early 2013. Slug testing was <br /> conducted by using a sand-filled PVC pipe as the slug. Both positive and negative slug tests <br /> were conducted. The program AQTE-SOLV was used to analyze the data. <br /> Western Water& Land, Inc. 31 <br />