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Mr. Hamarat <br /> March 7, 2017 <br /> Page 2 <br /> significantly exceeds the storage requirement. However, this excess capacity will decrease <br /> throughout the coming year as additional inflows to the system occur and a portion of the <br /> storage space is filled with deposited tailing. <br /> A relatively accurate determination of the flood storage capacity in the impoundment can be <br /> made at the time of the surveys in June and October. An operations model has been <br /> developed to track water levels and estimate the flood storage availability in the system <br /> between surveys. This model is updated by Henderson personnel or Wheeler on a monthly <br /> basis. One of the reports generated by this model is the attached TSF Water Level Report <br /> (Figure 3). This graph shows the actual water level in the TSF as compared to the "High- <br /> High" level in the pond, which is defined as the level corresponding to 3,582 acre-feet of <br /> available capacity. Note that the actual water level did not exceed the High-High level at <br /> any time in 2016. This shows that the required flood storage space was maintained in the <br /> system throughout the 2016 calendar year. <br /> If you have any questions regarding the enclosed information, or if you require additional <br /> information, please call. <br /> Sincerely, <br /> W. W. Wheeler and Associates, Inc. <br /> Steven M. Maly, P.E. <br /> CC: Dillon Benbow, Henderson Mill (via e-mail) <br /> Tim Haynes, Henderson Mill (via e-mail) <br /> Katie Kruger, Henderson Mill (via e-mail) <br /> R\1300\1333\1333 00\PROJECTS\PONDSRVY\Pondl6Fall\Annual Report\17marWlet Hamarat TSFReport docx <br />