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Ms. Christine Johnston <br />Mountain Coal Company <br />Page 24 <br />April 14, 1997 <br />103. Referring to Map 53B and Drawing E611102A, both submitted on March 7, 1997, will <br />outflow from the existing culvert (C2R-6?) flow across the proposed live subsoil stockpile <br />#1? <br />104. Because the detention pond that feeds into culvert CC W I -B is designed [o allow a backup <br />of water behind the pond outlet, the Division considers the detention pond to be an <br />impoundment and, therefore, falls under the requirements of Rule 4.05.9. Among other <br />requirements, pond certification and inspections will be required. Please provide a larger <br />scale drawing of the detention pond volume capacity, a hydrology design showing that <br />the pond can contain the required volume of water, and hydrology designs that show the <br />riprap is of the correct size. <br />Please call if you have any questions concerning the Division's review of MCC's March 7, 1997 <br />adequacy response submittal for PR-07. <br />Sincerely, <br />~.~~ ~ ~~- <br />Michael P. Boulay, <br />Environmental Protection Specialist <br />c: David Berry, Susan Burgmaier, Bill Carter, Joe Dudash, Susan McCannon, Jim Pendleton, <br />Larry Routten <br />c:\wp51 \westelk\pr07adq.2 <br />