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~. <br />Mined t_and keclamatian March 13, 19F3% Forge <br />^ur F='rimary control loop traverses through the following sub- <br />sidence stations: <br />D-11-U - Control <br />U-T-~ <br />U1 <br />U5 <br />U9 <br />Ua1 <br />U8 <br />D-12-U - Control <br />The following subsidence stations are tied to this primary loop <br />by secondary loops: <br />U4 <br />U' <br />U2 <br />The following stations have been monitored by sideshots, angles <br />and distance: <br />~ ~~ <br />ulo <br />uli <br />u21 <br />U22 <br />These monuments are 1" steel pipe with attached range pole and <br />retro-reflector prism. <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 20,404. We have had closures bet- <br />ter than 1 part in 104,OOG. <br />Fallowing in Table I is a list of the stations with their coor- <br />dinates and elevations for August, 1985, June, 1986, November <br />1986 and the resulting mean values: <br /> <br />~J <br />