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<br />Memo to Garv Curtiss -3- January 29, 1997 <br />Summary and Conclusion <br />The operator has adequately characterized runoff conditions in the <br />quarry drainage basin that would result from the 10 year-24 hour <br />event, and has appropriately sized ditches and spillways to convey <br />the runoff, but has not designed adequate structures to remove <br />sediment or to minimize the erosion that cause suspended solids <br />generation. The operator needs to provide designs for sediment <br />control structures and diversion of clean water, and illustrate the <br />location of all basins, check dams, filters, ditches, culverts, <br />cross drains, etc. Chat will be required, on the base map. The <br />designs need to be provided for review by the Division such that <br />the plan can be implemented prior to spring storms that can be <br />anticipated in April. <br />attachment <br />cc: Carl Mount <br />C:\NP51\~RERCRR.t4N <br />