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<br />Using these results, the impact on the ground <br />water regime due to the mining operation can <br />6e evaluated. The radius of influence of line <br />sin); is calculated as: <br />r = 2 C(T)(t)/S7 <br />Using t = 2 years = 730 days as the time <br />since the iirawdown began the following result <br />is obtained: <br />r = 2 [(50)(730)/.227 = 814 <br />Radius of Influence (f t) <br />= nu r = r ~u r = ~n r = <br />5 = . LU ti54 11Ut{ 1:,51 14F3V <br />5 = .23 797 1127 1260 1380 <br />Thus the radius of influence due to the <br />mining operation is about 80G ft which will <br />not effect any wells in the area. The time <br />was chosen as tMO years since this is the <br />maximum tune any area is exposed before recla- <br />mation is complate at that location. <br />The isopleth maps for showing and determining <br />depths and contours of gravel, clay, and <br />groundwater weTebased on drill hole logs and <br />the information interpreted from those logs. <br />F:.;:.n.i 1', .i. c. L~- Rr:-v.r.l r~.ml..i nr~ Plan <br />i., fhr' LiJ'i.~i:IUI': 1~-. cc;n~-ernd i:hat a minimum of r.7n1•:~ H_-ice'" of <br />tnl_~sc~il placed nv:=rr a c1~ty--rich base will not: a~ffc~rd far <br />a~degi.i~:~te ~_oil n~~c;i.=.~ture r~e•t~~n~.ion, anc r-o:_;t pc.nE~ira'•._i~~n, c~nri <br />I1 t.l"IV=, cluesti.un whc~~ther long--~t:rrrn ;acrcr_:e=sfua reverletart.ion cn~~..Ld <br />Np Lc:~ a•!uevi~d, Wc. tF;erefnr'r.. r-ecommer~d that .a minim~.rm ^+ U_'-1'3•• <br />c,f Cop•_oi.l.igra~-•e 1. 6c• used (thin;, mny recpa~ire {-h~~t h"~- of <br />q~-~r:al Fie :! eft i r. pl acc~l .. <br />Recommendation noted. <br />.. Thc• appli.cra~.ior~ sh;:n.rld I:rrovide more sper_ifi.c. i.nfurrnatian c-;n <br />I~ioa~ 1~.hra ponds o-;i.la ~;e reclaims=d„ <br />The ponds will be reclaimed by grading the dam <br />material across the silted-in pond after the <br />ponds are drained. It is quite likely excess <br />material will result and, that material, will <br />be used when grading the immediately adjacent <br />area. <br />7 <br />ineering & Environmental <br />