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• The outlet pipe was connected to the inlet structure using a standard pipe collar, not <br /> grout, as specified. The reason for this change is due to the change in inlet structure <br /> materials. A short piece of 18-inch pipe was welded to the inlet structure so that a <br /> standard pipe collar could be used to connect the culvert pipe. <br /> 3.3 Pipe Inlets,Culverts,and Outlets <br /> The pipe inlets, culverts, and outlets were installed in general accordance with the plans <br /> and specifications. The pipe culverts and pipe sizes and lengths at Stations 14+50 and 19+25 <br /> were constructed in accordance with the specifications. <br /> Field conditions encountered resulted in the following changes: <br /> • The 18-inch pipe culvert at Station 20+00 was modified to use existing drainage. The <br /> outlet location and invert were installed as designed. The pipe was shortened from 60 <br /> feet to 20 feet and the inlet was placed north of the road in an existing drainage ditch <br /> to accommodate existing drainage. <br /> • Rip-rap for the culvert outlet at approximately Station 19+25 was expanded to <br /> dissipate energy for storm water flow resulting from runoff from either side of the <br /> wingwalls. <br /> 3.4 Retaining Wall <br /> Field conditions and an apparent discrepancy between the final road elevations shown on <br /> Sheet C4.10 and Sheet S2 of the design drawings necessitated significant changes to the wall <br /> design and construction. <br /> The changes were as follows: <br /> • Wall alignment starting from Station 19+12 and ending at Station 18+00 was moved <br /> to the outboard side of the road. This change was necessitated by the presence of a <br /> bedrock outcropping that required the work area behind the retaining wall to be <br /> expanded for proper geogrod installation. The wall alignment change was also done <br /> to minimize wall height. <br /> • Wall height was increased to construct the road at the proposed finished grade shown <br /> on Sheet C4.11. The maximum height of the wall was extended from 15 feet to 19.5 <br /> feet. The height change increased the wall square footage from 1,305 square feet to <br /> 1,716 square feet and increased the length of mechanically stabilized earth(MSE) <br /> wall from 47 feet to 64 feet. The overall length of the retaining wall (124 feet)did <br /> not change. <br /> The extended wall height stability was evaluated by J. Erich Rauber, PE as a <br /> contractor to Wildcat. Attachment_of the As-Built Report presents the design <br /> As-Built Technical Summary April 29.2014 <br /> New Access Road Page 3 <br />