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_~ - - --- --- - - - I I I .~ f, II~~r1~1 ll(•li iW u~l <br />I~ <br />f <br />Work Plan for Alluvial Groundwater Characterization, Big Elk Mine AdrianBrovm <br />The 3/4-inch diameter wells will be developed using a 3/4-inch surge block, attached to 3/8-inch rigid <br />pipe. The wells will be surged using the surge block and pumped using a foot valve to remove fines <br />from the well screen and formation immediately near the screen. <br />Water quality pazameters, including temperature, pH, conductivity, and turbidity, will be monitored <br />during well development. Wells will be developed until field parameters stabilize and the discharge <br />water is visibly clear. <br />Development will achieve the following results: <br />• Rectify drilling effects, including clogging, smearing, or compaction of formation materials at <br />borehole wall; <br />• Rectify drilling effects on hydraulic conductivity (such as localized zones of lower hydraulic <br />conductivity); and <br />• Remove fines from the formation adjacent to borehole and/or from the filter pack, for the <br />purpose of reducing or eliminating turbidity in future samples and minimizing potential for <br />clogging and damaging pump equipment. <br />Well Surveying. <br />Afrer drilling and completion, well elevations (top of casing) and ground surface elevations will be first <br />estimated from 7.5-minute topographic maps, and will subsequently be surveyed. A measuring point on <br />the north side of the casing will be marked or cut into the top of the casing. <br />4.4 Collect Water Level Data <br />Water level elevations will be measured from the north side of the PVC casing, according to standard <br />operating procedures. Water levels will be monitored monthly, beginning in February, 1998, in all <br />alluvial monitoring wells. <br />4.5 Collect Water duality Data <br />4.5.1 Monthly Water Quality Measurements <br />Field parameters (temperature, pH, and conductivity) will be measured monthly in all wells, in <br />conjunction with monthly water level sampling, beginning in February. 1998. This sampling will be <br />performed in conjunction with monthly water level measurements, which will be taken first, Wells will <br />be purged by submersible pump, inertial pump, or bailer until parameters stabilize, before monthly field <br />pazameters aze measured. <br />4.5.2 Quarterly Water Quality Sampling <br />Water quality samples will be collected quarterly for laboratory analysis, beginning during the Winter <br />quarter (February, 1998). The wells will be sampled according to standard procedures for environmental <br />groundwater sampling. <br />I project 14630.980223 6 <br />