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Final Technical Report, 2014 Monitoring Well Rehabilitation Program Bowie Mine 15 <br />2.6 Replacement Well BRL- IP- 14 -67 -D -BLW <br />Drilling replacement well BRL- IP- 14 -67 -D -BLW began on August 23, 2014 and the well was <br />completed and developed on September 6, 2014. Bowie's consultant, Brad Lindsey primarily <br />supervised the drilling and installation under the direction Joe Frank of HydroGeo. However, <br />Paul Stubbe, HydroGeo's field geologist took Brad's place on August 24th and Bowie's geologist <br />Kendra Hinton supervised the activities on September 6, 2014. It should be noted that there were <br />numerous weather delays and work shift breaks during the drilling of this well. <br />On August 23, 2014 RACS installed and cemented in 64 feet of 10 -inch steel surface casing, <br />sealing off the surface colluvium. The 8 5/8 -inch diameter borehole for the well was drilled <br />from 64 feet to a depth of 364 feet and well building began on August 27th. Prior to well <br />installation the well bore caved in from a depth of 360 to 364 feet. The total depth of the well is <br />357 feet bgs. The well was constructed with 4 -inch Sch. 40 flush joint blank PVC well casing <br />from 357 to 347 feet bgs, followed by 10 feet of 4 -inch Sch. 40 0.020 slot PVC screen from 347 <br />to 337 feet bgs. Washed silica sand (10 -20) was installed in the annulus of the well from a depth <br />of 360 to 322 feet bgs. A bentonite chip (Pel Plug) seal was installed above the sand pack from <br />322 to 312 feet bgs followed by bentonite grout (Snaco grout 30) to a depth of about 159 feet, <br />followed by 3 feet of cement to 156' bgs, then bentonite chips (3/8 ") to 80 feet bgs. Cement was <br />used to fill the annulus from 80 feet bgs to 2 feet above the ground surface. There is <br />approximately one foot of sand surrounding the 2.86' PVC stickup within the well head and the <br />well has a locking well cap. The well completion diagram is presented in Appendix A. <br />Well development of the new well began on September 4, 2014 and was completed on <br />September 6, 2014 when field water quality parameters of the well water stabilized with an <br />average pH of 7.93 s.u., average conductivity of 2,091 µS /cm, and average temperature of 20.9° <br />C. The static water level was 344.5 feet btoc on September 6, 2014. A water quality sample for <br />laboratory analysis will be collected in October 2014 using a stainless steel point source bailer. <br />Laboratory water quality data will be summarized in a subsequent report. <br />2.7 Well BRL- IP- 00 -67 -D -BLW <br />The original well BRL- IP- 00 -67 -D -BLW was abandoned by RACS on September 3, 2014. <br />November 2014 HydroGeo, Inc. <br />