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~,~ <br />• Mined Lend Reclamation 2 December 11, 1989 <br />We have developed a sequence for the surveys that divides the <br />stations into primary control loops and points tied by sideshot <br />only. All stations are 3" diameter steel pipe described in our <br />report dated August 10, 1985 unless noted otherwise. <br />Our Primary control loop traverses through the following aub- <br />sidence stations: <br />Sequence of Survey: <br />D-11-U - Control <br />UT2 <br />U4 <br />U1 <br />U3 <br />U2 <br />U5 <br />U9 <br />UA1 <br />UB <br />• D-12-U - Control <br />The following stations are monitored by sideshots, angles and <br />distance. <br />U10 <br />U11 <br />The surveys we performed are a second order, Class II Survey <br />using a 1-second theodolite and electronic distance meter. <br />Elevations are obtained by trigonometry. Closure necessary for <br />this class survey is 1 part in 20,000. We have had closures bet- <br />ter than 1 pert in 100,000. <br />Following in Table I is a list of the stations in the main sub- <br />sidence loop with their coordinates and elevations from August, <br />1985, through November, 1989 and the resulting mean values: <br /> <br />