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r• <br /> <br />Christine Johnston <br />August 4, 1997 <br />Page 2 <br />5. The curve numbers applied do not appeaz to take into account the disturbed cut slope <br />areas, in that numbers of 70 and 72 have been assigned to entire watersheds which <br />contain both disturbed and undisturbed azea. Please review and revise the assigned curve <br />numbers so that disturbed azeas aze represented appropriately. <br />6. MCC proposes the use of straw bales and silt fences for sediment control on the <br />ventilation shafr azea. Given that the disturbance azea is somewhat large (3.1 acres) and <br />steeply sloped, the Division does not believe straw bales and silt fences will be adequate <br />to ensure compliance with effluent standards. Please either provide additional <br />information which demonstrates that the proposed sediment control practices will be <br />effective, or provide design information for some other means of treatment. The Division <br />suggests that MCC consider routing flow from these disturbed azeas to the sediment pond <br />on the SGFA ventilation shafrs #1 and #2 bench. <br />If you have any questions, please call. <br />Sincerely, <br />Michael P. Boulay <br />Environmental Protection Specialist <br />