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WASHINGTON OPEN PIT <br /> SUBSIDENCE MONUMENT SURVEY <br /> Date Monum. No. Northing Easting Elevation Rmafs <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 /> 7/23/93 WOP-2 17306.39 20238. 05 12428 . 61 <br /> 7/23/93 WOP-4 17380. 66 20272. 94 12432.67 <br /> 7/ 23 93 WOP-6 17484. 37 20151 . 51 12483 . 92 <br /> A - 5 <br />