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Mr. Hamarat <br /> January 29, 2015 <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 May and October. An operations model has been <br /> developed to estimate the flood storage availability in the system between surveys and is <br /> updated by Henderson personnel on a monthly basis. One of the reports generated by this <br /> model is the attached TSF Report (Table 3). This report shows the flood storage conditions <br /> in the system on a monthly basis throughout the period from October 2014 to October 2015. <br /> The last column of this table verifies that at least 3,582 acre-feet of storage capacity was <br /> available throughout the period. The attached Figure 5A graphically shows the actual water <br /> level in the TSF as compared to the "Hi-Hi" level in the pond, which is defined as the level <br /> corresponding to 3,582 acre-feet of available capacity. Note that the actual water level did <br /> not exceed the Hi-Hi level at any time in 2015. <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\Pondl5Fall\Annual Report\16jan291 et.H a ma rat.TSFReport.docx <br />