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Subsidence ~+e1d Observations <br />West Elk Mme <br />August 27-29, 2002 <br />Fikurc 17, tiubsidcnrc cracA in friable .andtilunc iv <br />hareh ~ixiblr after teo years or wcuthrrink and <br />infillint;. <br />I uiatiun I.+: <br /> - ac ~ ~~~ <br /> <br /> <br /> 1 <br /> <br />Location 13 relates to suhsidenu; crocks at Apache Rucks ()~igurcs IS and 19). 'Phis is <br />inti+mwtion is supplement:d to the infimnution given Ibr Loeulion 7 of the Septemlx;r 27. 2000 <br />report (pages ~-7) ;md Location 6 of August 29, 2(101 rrlxirt (pages 7-9). Sec the 2000 and 2001 <br />reports Ibr more detail on these. cracks lalso sec video Ibr more details). <br />The major tension cracks nlapp~d in 2000 and 2001 seem to be as much as 10 to 2(14~o wider <br />and 20 to 40°~+ longer than thry were in September 20(10 (compare Figure 19 oPthis report <br />with I~igurc 2 ufthc Srptrmhrr'_O(111 npurtl. <br />1 he weathered hcdnxk and soil, which haJ bridged the crocks in prior years, has now locally <br />lallcn into them, and now exlxises the cmcks to Ix longer (Figure 19). <br /> <br />831-032.570 <br />l3ecemtxer 2002 <br />Figures 18 and 18. Westward view <br />of en extensive set of subsidence <br />cracks at Apache Rocks In <br />sandstone (left) and eastward view <br />of a single extensive crack In <br />sandstone, woatherod bedrock and <br />coltuvium (right). <br />Wnyht Water Engineers, Inc <br />1 <br />-`.~. <br />:• y <br />