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<br />Mr. Randall P. Price <br />April 29, 1994 <br />Page Two <br />The crossing will have across-sectional area equal to or greater than Ditch B-2 with low-gradient <br />approaches on either side of the flow channel. Upstream and downstream sideslopes will be <br />graded to provide a smooth transition between the crossing azea and ditch channel. Since design <br />flow velocities are below the threshold level requiring riprap, the sole purpose of riprap <br />placement in the crossing area will be to prevent rutting and similar erosion damage. Kerr will <br />place minimum three inch Dso riprap material in the crossing area and for a reasonable distance <br />on either side to minimize erosion. <br />Accompanying this transmittal are relevant revised design calculations, a modified ditch design <br />summary sheet, and a completed application form for permit revision. Please feel free to <br />contact me with any questions regarding this transmittal or the revised ditch designs. Given that <br />the subject ditches are a component of the final reclaimed configuration and the current status <br />of the partial bond release application, your assistance and coopers[ion in expediting review of <br />this revision application is appreciated. <br />Best regards, <br />TerraMarrix Inc. <br />~~ <br />Jerry <br />JMN:cmc <br />cc: G. Patterson/Kerr <br />