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<br />.: _ <br />Angle of Draw <br />Depth of Cover @ Monument 16 - 680 ft. <br />Point of Zero Subsidence - between Monuments 19 E 20 <br />Distance from Monument 16 <br />-Tl-- to Monument 19 - 210 ft. <br />- to Monument 20 - 280 ft. <br />Angle of Draw <br />• 16 - 19 <br />Tan ~- = 210 <br />680 <br />_ .309 <br />-8- = 17° <br />16 - 20 <br />Tan ~- = 280 <br />680 <br />_ .412 <br />-B- = 220 <br />• <br />