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Date <br />1988 <br />8/89 <br />10/89 <br />7/8/91 <br />9/18/91 <br />1988 <br />8/89 <br />10/89 <br />7/8/91 <br />9/18/91 <br />1988 <br />8/89 <br />10/89 <br />7/8/91 <br />9/18/91 <br />10/89 <br />7/8/91 <br />1/18/91 <br />Monum. No. <br />WOP -2 <br />WOP -2 <br />WOP -2 <br />WOP -2 <br />WOP -2 <br />WOP -3 <br />WOP -3 <br />WOP -3 <br />WOP -3 <br />WOP -3 <br />WOP -4 <br />WOP -4 <br />WOP -4 <br />WOP -4 <br />WOP -4 <br />WOP -6 <br />WOP -6 <br />WOP -6 <br />WASHINGTON OPEN PIT <br />SUBSIDENCE MONUMENT SURVEY <br />Northing Easting Elevation <br />17306.34 <br />17306.63 <br />17306.36 <br />17306.45 <br />17306.43 <br />17157.51 <br />17157.56 <br />17157.51 <br />17157.39 <br />12432.70 <br />12432.64 <br />12432.77 <br />12432.68 <br />12432.61 <br />12483.85 <br />12483.94 <br />12483.89 <br />20237.75 <br />20238.26 <br />20237.84 <br />20237.82 <br />20237.86 <br />20675.10 <br />20675.47 <br />20675.13 <br />20674.95 <br />17380.92 <br />17380.93 <br />17380.87 <br />17380.84 <br />17380.81 <br />17484.50 <br />17484.48 <br />17484.47 <br />12428.59 <br />12428.44 <br />12428.64 <br />12428.54 <br />12428.51 <br />12427.57 <br />12427.36 <br />12427.50 <br />12427.61 <br />-- inaccessible <br />20272.77 <br />20272.94 <br />20272.78 <br />20272.70 <br />20272.79 <br />20151.42 <br />20151.36 <br />20151.35 <br />orig. <br />orig. <br />orig. <br />orig. <br />