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<br />Mined Land Reclamation <br />2 <br />July 10, 1990 <br />We have developed a sequence for the surveys that divides the sta- <br />tions 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 <br />sidence stations: <br />Sequence of Survey: <br />• <br />D-11-U - Control <br />UT2 <br />U4 <br />U1 <br />U3 <br />U2 <br />U5 <br />U9 <br />UA1 <br />U8 <br />D-12-U - Control <br />through the following sub- <br />The following stations are monitored by sideshots, angles and dis- <br />tance. <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. Eleva- <br />tions ere obtained by trigonometry. Closure necessary for this <br />class survey is 1 part in 20,000. We have had closures better <br />than 1 part 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 July, 1990 and the resulting mean values: <br />• <br />