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1/4-in Thick Steel Trivot- Plate <br /> Surface <br /> 1-ft and 2-ft Lengths of EW Rod <br /> Coupled Together and Driven <br /> to Refusal <br /> Machined Steel Driving Point <br /> r <br /> Not to Scale - <br /> P <br /> FIGURE 6 . SUBSIDENCE MONITORING POINT <br /> FABRICATION DETAILS P <br /> 20 <br />