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<br />are also available for pedestrian traffic. All pier connections have slotted bolt holes for <br />expansion and contraction. The pedestrian capacity system uses wood beams. For maximum <br />stability, the boardwalk must be constructed lower than thirty inches above the soil surface. The <br />cost of the lightweight pedestrian Helical Pier System is approximately $30 per square foot. The <br />Helical Pier Shaft is pictured in Figure 1. <br />The Helical Pier System can be used to span distances that are less than eight feet and <br />straight. Longer and more complex crossings require the construction of a bridge with concrete <br />abutments at each side. For bridges less than fifty feet in length the average cost is $75 per <br />square foot. This average cost also depends on the elaboration of the finished product. <br />Currently, the proposed trail does not include water crossings that require bridge construction. <br /> <br /> <br />Figure 1: Helical Pier Shaft with U Shaped Bracket Sleeve <br /> <br />16 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />