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• INTRODUCTION <br />All drainage and sediment control structures have been designed to <br />conform with the Performance Standards of Rule 4.15, Hydrologic <br />Balance. In July and August of 1987, all pond structures were <br />reviewed. In November 1989, all ditch and culvert structures were <br />reviewed. <br />For locations of drainage and sediment control structures, refer <br />to the Drainage and Sediment Control Map (Map 26). <br />r1 <br />U <br />• <br />Exhibit 18 Revised 12/8/89 <br />-1- <br />