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1 <br /> y <br /> WASHINGTON OPEN PIT <br /> SUBSIDENCE MONUMENT SURVEY <br /> Date Monum. No. Northing Easting Elevation marks <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 /> i 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 /> C <br /> A-4 <br />