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Table 1 Monitoring requirements <br />(until hydraulic conditions behind plug stabilize) <br />ID Measurement Analytical Description I Frepuenc~ Period Comments <br /> suite' <br />Trench Inlet Water sample Standard Water quality of influent to Monthly When trench is operating Sample collected from adit plug discharge point <br /> infiltration trench to trench (ID formerly labeled 9360 Portal) <br />Trench Inlet Flow rate NA Infiltration trench influent rate Daily When trench is operating Flow measured by weir or recording time <br />Flow required to fill calibrated bucket <br />SP-1 Water level NA Water level in trench standpipe Daly When trench is operating <br /> near head of trench <br />SP-2 Water level NA Water level in trench standpipe Daily When trench is operating I <br /> near end of trench <br />VP-1 Water level NA Water level in vadose zone Weekly When trench is operating <br /> piezometer near SP-1 <br />VP-2 Water level NA Water level in vadose zone Weekly When trench is operating <br /> piezometer near SP-2 <br />APP Pressure NA Water pressure exerted on I Daily i When adit plug relief valve is closed More frequent measurement if pressure <br /> adit plug I Weekly i once pressure stabilizes exceeds 11 psi, <br /> <br />Visual 1 <br />Visual <br />NA I <br />Inspection of trench for capacity I Daily ~ <br />When trench is operating l <br /> exceedance I I <br />M <br /> <br />Visual 2 <br />Visual <br />NA - <br />Possible seepage around I I <br />Daily <br />When adit olug relief valve is closed <br />If seepage observed, Flow to be measured <br /> adit plug Weekly once pressure stabilizes using weir <br />Visual 3 Visual NA Possible development of seeps I Daily ~ When adit plug relief valve is closed <br /> near portal Weekly once pressure stabilizes <br />WGL Weir Flow rate NA Flow rate in lower Windy Gulch Monthly, continuous On-going since April 1998 Data logger to be used beginning spring 1999 <br /> using data logger (ID was formerly called WGWB) <br />WGL Weir Water sample Standard Water quality of lower Windy Monthly On-going since April 1998 (ID was formerly called WGWB) <br /> Gulch <br />DT-1 Water sample Standard Seep downstream of 9360 waste Minimum of Before plug valve closure To establish baseline conditions prior to plug <br /> dump one sample closure. one sample taken in 1998 <br />DT-2 Water sample Standard Seep downstream of 9360 waste Minimum of before plug valve closure To establish baseline conditions prior to plug <br /> dump one sample closure, one sample taken in 1998 <br />Creede Water level NA Water level in Creede Formation Continuous using Not established If data logger removed, revert to monthly <br />Formation Well I near 9360 portal ~ data logger I measurements, (ID also known as HW-3) <br />' Standard suite includes: A2Ce~V@C~ <br />• total and dissolved analysis for arsenic, cadmium, copper, iron, lead, manganese, mercury, zinc <br />• lab pH, conductivity, total suspended solids, total dissolved solids, sulfate <br />• field pH, conductivity and temperature. Y-Y q O j„ . <br /> <br /> <br />Durango Fteld aHi^ <br />DiWsbn of btir>tra v a ~cclogq <br />