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Mountain Coal Company- West Eik Mine <br />Sylvester Gulch Road Geotechnipl Irnestigation <br /> <br />Slyvester Gulch Seismic Line 34+00 <br />>z7o <br />7280 <br />_.. __. <br />-~ -- -. .. .. <br /> <br />7250 _. _.. .. _.._. _..... ._ .._ <br /> ~ <br />Moo ~ .... .. _.. .._.... .. _._._.. ..- ._. <br />~ NE <br /> ~ <br />7230 _- _- ..... _- __._ _... ... .... ... _.... ~- -. <br /> <br />Ga <br />Y4 ~ <br />~ <br />772D .. _ ...-.. _ .. .. .. <br />. _.._.. . . <br />C <br />g`r 72,0 ~ <br />- ... ..M .... .. ... . .... .. _.... ...._.~-vp.. ~_._.-____._. _ <br />72~ .. - - - ... . .. .~. Yn. .._ - yp ... . - <br />0 p4 pp YM W <br /> <br />7180 ... - __ .__-. -_ .. .~... <br />V1 = 1700 ft/s <br />7170 --. .._.. _ ... _. _. _.._... .. _ __ ... <br />7,w -»-Groiald Surface _ ... _. _. - <br />7so --Bound 1 _---. ...._V2 = 6625 ft/s .... . <br />nao <br /> o ,o zo 3D ~ so so 7o eo 90 ,oo „o ,zo ,30 ,ao rso ,so no ,eo ,so zoo z,o zzo 230 z <br /> Obtanw (ft) <br />• 34+00 <br />Seismic refraction results reveal a second layer of higher velocity material which occurs Heady parallel to <br />the surface at an average depth of 25 feet (Figure 14). The velocity of the first Lryer is typical of <br />unconsolidated sedime~. Velocities for the second layer indicate highly weathered bedrock <br />• <br />• <br />Figure 1 d. Seismic refraction profile at 34+D0. <br />35+00 <br />Seismic refraction results reveal a second layer of higher velocity material which occurs Heady parallel to <br />the surface at as average depth of 17 feet (Figure 15). The velocity of the fast layer is typical of <br />unconsolidated sediments. Velocities for the second layer indicate highly weathered bedrock. <br />Seismic Refraction Survey <br />Summary of Operations <br />7z7o Styvester Gulch Seismic tine 35+00 <br /> sv+ <br />7zso c+ - - - <br /> az ~ <br />7z5o W ~' <br /> <br />7240 W ~ <br />_. .. <br />.. _ <br />... .. .. -.. .. .. --- -_ <br /> ~ <br />~ <br />oz <br /> os <br /> <br />7290 . <br />. _.. - _ .. ~ - .... <br /> ~ <br />~ 9 <br />7220 - 98 . - - g18 <br /> ~ qfl <br />a 7zto ... .. ~o .._ .. <br />~~ v,e vs <br /> C>• <br />~Z Ygl3 <br />7200 . <br />7,90 ... .. .. - <br />-c;~ou<as~~ V1 =1450 <br />7,80 -Boundary, ... _ .. _ _ .. - V2 = 5350 ft/s <br />7170 .. ... - <br />7,80 <br />o ro m 90 4o so so 7o eo so ,oo r,o ,zo ,so ,40 ,w ,eo no ,90 ,vo zoo ro zzo reo <br />deD,na pq <br />Frgure 15. Sersmlc refraction profile pt 35+00 <br />UMS, Inc. <br />Page 11 <br />05/17/03 <br />