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1 <br /> <br />1 <br />1 <br /> <br />1 <br />1 <br />LJ <br /> <br />1 <br />1 <br /> <br />1 <br />1 <br />1 <br />1 <br /> <br /> <br /> <br />Long term adit monitoring 9 <br />3.3 Adit plug monitoring <br />The measurements to be taken as part of the long term adit plug monitoring will include: <br />• water pressure behind the plug, and <br />visual inspections around the plug and portal. <br />3.3.1 Water pressure monitonng <br />The water pressure behind the adit plug will be measured over the long term using a pressure <br />gauge mounted on the stainless steel pipe that is cast into the adit plug. The pressure will be <br />monitored on a monthly basis. Should the pressure exceed 11 psi, the monitoring frequency may <br />need to be increased to ensure the plug is operating adequately. <br />3.3.2 Visual inspections around plug and portal <br />Visual inspection of possible seepage around the adit plug will take place during this monitoring <br />period, when the plug is accessible on a monthly basis. If seepage is detected, flow will be <br />directed to the infiltration trench. At this time, infiltration trench monitoring will take place as <br />described in Table 2.2. <br />Visual inspection around the portal will also take place in to detect the possible development of <br />springs and seeps. This inspection will also be performed on a monthly basis during this period. <br />3.4 Tracer test monitoring <br />Additional water quality monitoring will be part of the proposed tracer test and include collection of <br />a sample of Windy Gulch water at the rectangular weir. The sample will be collected on a monthly <br />basis far the initial six months, then quarterly, and be analyzed for tracer concentration. The <br />protocol for tracer analysis will be developed as part of the tracer test procedure. <br />3.5 Reporting <br />During this period of long term adit monitoring, the relevant data gathered as described above will <br />be summarized in a quarterly report for submittal to DMG. This quarterly report will then <br />supersede the monthly reporting requirements described in Section 2. <br /> <br />