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Pit No. <br />Survey Date <br />Arkansas <br />River <br />D g <br />( <br />Water Surface Elevation (ft, NAVD88) <br />Surveyed <br />Assumed Minimum <br />Normal <br />1 <br />Oct 2008 <br />16 <br />3604.9 <br />3604.5 <br />2 <br />Oct 2008 <br />16 <br />3602.1 <br />3602.0 <br />3 <br />Oct 2008 <br />16 <br />3602.1 <br />3602.0 <br />4 <br />July 2009 <br />620 <br />3602.5 <br />3600.5 <br />APPENDIX D.1 <br />Minimum Normal Water Surface Elevations In Pits <br />Water surface elevation in Pits #1, #2, and #3 were surveyed by King Surveyors, Inc of Windsor, <br />Colorado on October 2 of 2008, and in Pit #4 on July 10` of 2009. Flow in the Arkansas River during <br />the October 2008 survey was low at approximately 16 cfs. The water surface in Pit #4 was surveyed in <br />July when flow in the river was approximately 620 cfs. Figure D.1 shows the overbank ground profile, <br />adjacent channel thalweg profile, surveyed pit water surface elevations, and the selected minimum <br />normal water surface elevations for each of the pits. Pit water surface elevations are dictated by water <br />levels in the adjacent river bed, given that there is groundwater connectivity. Under normal conditions <br />it is unlikely that pit water surface levels will drop below the adjacent channel thalweg. Minimum <br />normal water surface elevations in the pits were selected based on: (a) pit water surface levels during <br />low flow conditions surveyed in October of 2008; and (b) the elevation of the channel thalweg adjacent <br />to the pit. <br />Table D.1 Lamar Pits Water Surface Elevations <br />