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maximum amount of subsidence that occurred over the <br />F -line during the period between 1981 and 1985 was 0 4 ft. <br />The maximum amount of subsidence that occurred over <br />the G -line during the same time period was also 0.4 ft. <br />This is an expected result because retreat mining of this <br />section was not completed. <br />THIRD -WEST SECTION <br />Subsidence profiles for the third -west section arc shown <br />in figure 14. As detailed in the mine plans, to prevent <br />vertical deformation near Cottonwood Creck and to isolate <br />= I 1 ~ <br />..< .. a'1ilEs'•• ' <br />r <br />'- f •� L ••'? • r -~ ' <br />P. <br />• 1. <br />Figws 12.—Subsleenee track 10ea1e4 over nort test sec*m. <br />t"t survey. <br />-C 5 <br />xEr <br />6 :4'91 <br />u <br />�-11Rr <br />-e s <br />13 14 <br />t[ytuNE1+'S ".>0-tt rDa: ^9 <br />Figure /3.—Subs1dence prordes rot southwest section. <br />13 <br />the stream from damage, several pillars were left unmincd <br />beneath the strcambed, providing a protective zone on the <br />surface. The subsidence profile for the A-line (from the <br />survey performed April S, 1986) shows very littic subsid- <br />ence except those points that overlap onto the fourth -west <br />panel, with a maximum subsidence value of 1.1 ft at station <br />A43. The survey performed on April 8, 1986 was after <br />0.5 <br />py,y -1 0 <br />-2.5 <br />AI I r-Y'—T"-r--r—r---I <br />211 <br />A-line <br />0 5---r--r--r— <br />C <br />0 <br />-0.S <br />l -fins <br />KEY <br />4/21/64 <br />4/22/95 <br />4/e/88 <br />-2.5 //24/91 - — — — — — - <br />-3.0 <br />I S 0 13 17 21 25 20 33 37 41 45 40 <br />IOtA.IE)ftS. 25.1t pacing <br />Ftgws 14. -"*Www* profts W thk west set"M <br />