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.~ <br />. ~ ~ iii iiiiiiiiiiiuiii <br />• <br />FOX CONSULTANTS, INC. <br />DENVER OFFICE <br />710 KIPLING STREET, SUITE 400 <br />DENVER, COLORADO 80215 <br />(3031233-7799 <br />13 June 1984 <br />Mr. Gregg Squires <br />Colorado Mined Land Reclamation Division <br />Colorado Department of Natural Resources <br />723 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />SUBJECT: Ohio Creek Coal Mine No. 2 <br />Dear Gregg: <br />RECEIVED <br />JUL 18 1984 <br />MINED UND RECUMgiIpN plVlglON <br />Colo. Oept Ot Natural Resources <br />Enclosed is a report outlining and certifying Ohio Creek Coal Mine No. 2 <br />sedimentation pond design and "as built" structure is in conformance with <br />CMLRD criteria. Criteria used to determine conformance with CMLRD regulation <br />includes: <br />o determining whether the peak runoff from a 10 year, 24 hour storm <br />will be contained <br />o determining whether the structure is capable to convey, through <br />an emergency spillay, the peak flow from the 25 year, 24 hour <br />storm <br />c insure the structure is designed to have a minimum of one foot of <br />freeboard and designed with a 3 year sediment storage volume. <br />Fox Consultants, Inc. reviewed the sedimentation pond design submitted to <br />CMLRD. All calculations are correct and the structure complies with <br />applicable. sedimentation pond design criteria. <br />Fox Consultants, Inc, conducted afield inspection of the structure <br />(enclosed), and it appears the structure is constructed as designed and <br />conforms to CMLRD criteria. <br />A FO% COMPANY <br />