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Table 1 Monitoring required by DMG after plug closure <br />(once conditions behind plug stabilize and tracer is injected) <br />ID Measurement Analytical Description Frequency Period Comments <br /> suite' •Z <br />Trench Inlet water sample standard water quality of influent to infiltration quarterly when trench is operating sample collected from adit plug <br /> trench drain pipe (formerly called <br /> 9360 Portal) <br />Trench Inlet flow rate NA infiltration trench influent rate monthly when trench is operating flow measured by recording <br />Flow time required to fill calibrated <br /> bucket <br />SP-1 water level NA water level in trench standpipe near monthly when trench is operating <br /> head of trench <br />SP-2 water level NA water level in trench standpipe near monthly when trench is operating <br /> end of trench <br />VP-1 water level NA water level in vadose zone monthly when trench is operating monitoring will continue for 2 <br /> piezometer near SP-1 weeks after trench operation is <br /> sto ed <br />VP-2 water level NA water level in vadose zone monthly when trench is operating monitoring will continue for 2 <br /> piezometer near SP-2 weeks after trench operation is <br /> sto ed <br />APP pressure NA water pressure exerted on adit plug monthly 2 years more frequent monitoring if <br /> ressure exceeds 11 si <br />Visual 1 visual NA inspection of trench for capacity monthly when trench is operating relief from monitoring may be <br /> exceedance requested when flow <br /> consistent) below 10 m <br />Visual 2 visual NA possible seepage around adit plug monthly while plug is accessible, if seepage observed, flow to be <br /> u to 2 ears measured usin weir <br />Visual 3 visual NA possible development of seeps near monthly 2 years <br /> ortal <br />WGL Weir flow rate NA flow rate in lower Windy Gulch monthly, on-going since April 1998 data logger to be used during <br /> continuous spring 1999 <br /> using data (ID was formerly called <br /> to er WGWBI <br />• <br />• <br />