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Final Technical Report, 2014 Monitoring Well Rehabilitation Program Bowie Mine 2
<br />Table 1. Well Characteristics and Summary of the Bowie 2014 Monitoring Well Rehab
<br />Program
<br />Well ID
<br />Well Completion Log Summary
<br />Issues
<br />Rehabilitation Plan
<br />Results
<br />\Work days
<br />Summary
<br />2010 -1SS
<br />Total depth (TD) 1,280',
<br />High pH >12.0;
<br />Clean mud cake out of casing;
<br />Cleaned well
<br />July 23 -30
<br />previously cemented to 1,140',
<br />mud cake buildup
<br />video well to determine casing
<br />casing and screen
<br />and August
<br />4 -inch fiberglass casing from
<br />on inside of
<br />and screen integrity; and
<br />and redeveloped
<br />5 -7
<br />surface to 1,120' and 1.5 -inch
<br />casing and
<br />redevelop well until well
<br />well.
<br />(11 days)
<br />stainless steel screen from 1,120'
<br />screen. Cannot be
<br />water quality reaches
<br />Static water level
<br />- 1,140'
<br />sampled
<br />equilibrium and has is
<br />(SWL) 1,092'
<br />reasonable values of pH,
<br />pH dropped from
<br />conductivity, and temperature.
<br />>12 to —9.75 s.u.;
<br />conductivity was
<br />—277 gS /cm;
<br />temperature was
<br />—27° C
<br />P- TC -03 -02
<br />Total depth (TD) 859', cemented
<br />Variable pH 7.7 —
<br />As above
<br />Cleaned well
<br />July 22, Aug.
<br />from TD to sandstone above U. B
<br />9.1; well casing
<br />casing from
<br />8 -9, and
<br />Seam (601'); 3 -inch steel casing
<br />and screen
<br />surface to —585';
<br />Sept. 15 -19.
<br />and 2 -inch SS screen 577.5' —
<br />plugged, cannot
<br />screened interval
<br />(7 days)
<br />587.5'
<br />be sampled
<br />was apparently
<br />breached and
<br />filled with sand
<br />pack material.
<br />As a result, well
<br />rehab could not
<br />be completed.
<br />P- TC -03 -01
<br />Total depth (TD) 895', 3 -inch
<br />Upper well U. B-
<br />As above
<br />Cleaned Upper
<br />upper (dual
<br />steel casing, upper - U. B -Seam
<br />Seam - high pH
<br />B -Seam well
<br />completion)\
<br />713', screen interval 2 -inch SS
<br />>12.0, well
<br />casing from
<br />July 22 and
<br />703' -713'.
<br />casing and screen
<br />surface to 705',
<br />Aug 9 -15
<br />plugged and
<br />including top 2'
<br />and Aug. 19
<br />cannot be
<br />of 10' screen.
<br />(9 days)
<br />Lower well - Rollins Sandstone
<br />sampled.
<br />Steel T -post and
<br />871', screen interval 2 -inch SS
<br />Lower well,
<br />bentonite or
<br />861' -871'
<br />Rollins sandstone
<br />cement clay
<br />- not monitored
<br />encountered at
<br />since 2010.
<br />705' that could
<br />(lower well was
<br />not be dislodged.
<br />not included in
<br />As a result, the
<br />rehab program)
<br />well rehab could
<br />not be
<br />completed and
<br />sabotage is
<br />suspected.
<br />CWI -DH -60
<br />Total depth (TD) 1,345',
<br />Mud cake inside
<br />As above
<br />Jetted well casing
<br />Aug. 20 -23
<br />cemented from TD to 1,085', 2-
<br />casing and cannot
<br />and screen
<br />(4 days)
<br />inch Sch. 80 PVC screened
<br />be monitored
<br />interval. Well
<br />interval 1,065' — 1,085'. U. B-
<br />water cleaned up
<br />Seam 1,068'- 1,073'
<br />to pH —7.8; cond.
<br />—930 gmhos/cm;
<br />temp. - -21 °C.
<br />CWI -DH -58
<br />Total depth (TD) 1,91499
<br />Mud cake inside
<br />As above and cement well
<br />Jetted casing
<br />Aug. 25-
<br />4 -inch steel casing from surface
<br />casing and cannot
<br />from TD to bottom of second
<br />from surface to
<br />Sept. 17
<br />to 1,580', 2 -inch Sch. 80 PVC
<br />be monitored and
<br />screened interval at -- 1,654'
<br />1,914', cemented
<br />(24 days)
<br />from 1,574' to 1,914', eight 20'
<br />too many
<br />well from 1,914'
<br />screened intervals: (1,594 - 1,614),
<br />screened intervals
<br />to 1,764', 4 -inch
<br />(1,634 - 1,654), (1,674- 1,694),
<br />to 2 -inch
<br />1,714- 1,734), (1,754- 1,774),
<br />crossover broke
<br />(1,794- 1,814), 1,834- 1,854),
<br />and well casing
<br />(1,874- 1,894)
<br />pulled up —46
<br />feet. Casin
<br />November 2014 HydroGeo, Inc.
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