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3-IN. METAL DISK <br /> 0.4 FT <br /> .� �'� •�.; ems... <br /> i <br /> 4-FT ° <br /> OR DEPTH D <br /> TO ROCK <br /> d <br /> v PORTLAND CEMENT <br /> ° SAND-CONCRETE <br /> v . <br /> 2-IN. IRON PIPE, <br /> 6-FT TANG <br /> 9-In. <br /> SURFACE SURVEY MONUMENT <br /> SUBSIDENCE MONITORING <br />