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~.. <br />III Iiiilllllllillll <br />~REG LEWICKI AND ASSOCIATES <br />September 10, 1992 <br />Joe Dudash <br />Mined Land Reclamation Division <br />1313 Sherman Street 2nd Floor <br />Denver, Colorado 80202 <br />Dear Joe: <br />1645 Court Plate <br />Suite 309 <br />Genver. Ccloratlo 80202 <br />PhoneiF.U((3031629-;335 <br />SEP 1119 <br /> <br />Re: Violations C-92-013, 014, <br />019, 020 and 021. <br />Enclosed is a request to vacate the above violations due to the <br />following information explained below. <br />violations C-92-013 and C-92-014 <br />These violations were issued because pond 15-P1 discharged and <br />because a collection ditch leading to Pond 15-P2 had breached. <br />According to the inspection report, a very large amount of rain <br />fell in a very short time at the site on June 29, 1992. The <br />inspection report states that Dan Gardner recorded that 0.4 <br />inches had fallen in approximately 20 minutes. In a phone <br />conversation with Dr. Barfield of Oklahoma State University, the <br />author of "Applied Hydrology and Sedimentology For Disturbed <br />Areas", knowing that the 10 year - 24 hour rainfall is 2.9 <br />inches, he stated that the event on June 29 was probably on the <br />order of an 8 year event using the largest rainfall increment <br />method. <br />However, the above amounts are based on the standard antecedent <br />moisture condition of If. As is shown on the copied page 83 of <br />earfield's book, if 1.1 inches of rain fell in the 5 days <br />previous to the date of concern, then the antecedent moisture <br />condition would change to III. This is for the U.S. in general. <br />It is likely that the amount of moisture required to change the <br />