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Mr. Hamarat <br />February 3, 2012 <br />Page 2 <br />"Henderson Millwater Barge Project — Hydrology Report" (February, 2005). The available <br />flood storage capacity in the system at the time of the survey exceeded the storage <br />requirement by 5,134 acre -feet. This excess capacity will decrease throughout the <br />coming months as additional inflows to the system occur and a portion of the storage <br />space is filled with deposited tailing. <br />A relatively accurate determination of the flood storage capacity in the impoundment can <br />be made at the time of the surveys. In 2011, a survey was performed in May and again in <br />October. An operations model has been developed to estimate the flood storage <br />availability in the system and is updated by Henderson personnel on a monthly basis. <br />One of the reports generated by this model is the attached TSF Report. This report shows <br />the flood storage conditions in the system on a monthly basis throughout the period from <br />October 2010 to October 2011. The last column of this table verifies that at least 3,582 <br />acre -feet of storage capacity was available throughout the period. The attached graph <br />shows the actual water level in the TSF as compared to the "Hi -Hi" level in the pond, which <br />is defined as the level corresponding to 3,582 acre -feet of available capacity. <br />If you have any questions regarding the enclosed information, or if you require <br />additional information, please call. <br />Sincerely, <br />W. W. Wheeler and Associates, Inc. <br />,,,,,...„,7‘,/-0, <br />Steven M. Maly, P.E. <br />Encl. <br />CC: John Barnes, Henderson Mill (via e-mail) <br />Tim Haynes, Henderson Mill (via e-mail) <br />Kimberley Grande, Henderson Mill (via e-mail) <br />Curtis Brown, Henderson Mill (via e-mail) <br />R:\ 1300\ 1333\ 1333.00\ DOCUMENTS\ CORRESPONDENCE \Ietters \12feb03let.Hamarat.doc <br />