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WASHINGTON OPEN PIT <br /> SUBSIDENCE MONUMENT SURVEY <br /> Date Monum. No. Northing Easting Elevation RMBRJG <br /> 1988 WOP-2 17306.34 20237.75 12428.59 orig. <br /> 8/89 WOP-2 17306.63 20238.26 12428.44 <br /> 10/89 WOP-2 17306. 36 20237.84 12428.64 <br /> 7/8/91 WOP-2 17306. 45 20237.82 12428.54 <br /> 9/18/91 WOP-2 17306.43 20237.86 12428.51 <br /> 1988 WOP-3 17157.51 20675. 10 12427.57 orig. <br /> 8/89 WOP-3 17157.56 20675. 47 12427. 36 <br /> 10/89 WOP-3 17157.51 20675. 13 12427.50 <br /> 7/8/91 WOP-3 17157 . 39 20674 .95 12427.61 <br /> 9/18/91 WOP-3 -- -- -- inaccessible <br /> 1988 WOP-4 17380.92 20272.77 12432.70 orig. <br /> 8/89 WOP-4 17380.93 20272.94 12432.64 <br /> 10/89 WOP-4 17380. 87 20272.78 12432.77 <br /> 7/8/91 WOP-4 17380.84 20272.70 12432.68 <br /> 9/18/91 WOP-4 17380. 81 20272.79 12432.61 <br /> 10/89 WOP-6 17484.50 20151 . 42 12483 .85 orig. <br /> 7/8/91 WOP-6 17484.48 20151 . 36 12483 .94 <br /> 9/18/91 WOP-6 17484.47 20151. 35 12483.89 <br /> 7/20/92 WOP-2 17306.48 20237.86 12428.97 <br /> 7/20/92 WOP-4 17380.87 20272.81 12433 .07 <br /> 7/20/92 WOP-6 17484 .55 20151 . 33 12484.40 <br /> 9/2/92 WOP-2 17306. 32 20237.84 12428 .71 <br /> 9/2/92 WOP-4 17380. 67 20272.90 12432.72 <br /> 9/2/92 WOP-6 17484 .41 20151.59 12483 .94 <br /> 9/23/93 WOP-2 17306. 39 20238.05 12428.61 <br /> 9/23/93 WOP-4 17380.66 20272. 94 12432.67 <br /> 9/23/93 WOP-6 17484. 37 20151 .51 12483 .92 <br /> 7/15/94 WOP-2 17306.50 20237.88 12428.57 <br /> 7/15/94 WOP-4 17380.73 20272. 84 12432.65 <br /> 7/15/94 WOP-6 17484.41 20151 . 33 12483 .91 <br /> A - 19 <br />