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permanently removed from agricultural production, 77.0 AF, will provide sufficient water for the <br />replacement of operational depletions in and out of the irrigation season. In order to replace the <br />lagged depletions from the-river, a minimum of 65.2 AF of Boxelder water arising from the 3'/2 DKC <br />shares will be diverted into the existing unlined ponds created by the current mining phase and <br />allowed, via infiltration, to recharge the river. Historic return flows for the net dry-up of irrigated <br />lands will continue to be diverted onto the farm and returned to the stream. Subsurface return flows <br />(subsurface RF) will be diverted into the unlined pit along with the depletion replacements. Surface <br />return flows (surface RF) will be diverted into Mallard Creek, which flows through the property and <br />discharges to the river east of the pit. The historic RF obligations total 157.7 AF, composed of 50% <br />surface and 50% subsurface. To manage the replacement and RF obligations DKC will install and <br />monitor water measurement devices at both the diversion into the unlined pit and the diversion into <br />Mallard Creek. <br />4.4.2 Timing of Replacements and Return Flows <br />Since the depletions and recharge are occurring in the same pond, the amount and timing of <br />depletion replacements and subsurface RF are~met automatically for each month afterthe first month <br />in which diversions exceed depletions. Therefore; depletions will be met for the period of May 2007 <br />through Apri12010 by the diversions occurring from May 2007 through October 2009. Depletions <br />occurring from Ma~r2007 through April 2010 will be met by the diversions occurring during the <br />period of May 2007 through October 2009. The recharge for the January 2008 through Apri12009 <br />depletions would bf; carried over to the following. year should this plan be approved fora 2-year <br />period. The net depletions occurring from January 2007 through Apri12007, totaling 9.1 AF, will be <br />recharged through the diversion of an additiona19.1 AF of Boxelder water during the period of May <br />2007 through October 2007 in months when there are deliveries in excess of that month's depletions: <br />Consequently, the total recharge diversions in 2004 will be 74.3 AF. <br />Table 4.3 outlines the amount and timing of diversions that will be required to meet the <br />depletion replacements and historic RF on a monthly basis (excluding the additiona19.1 AF required <br />for the year 2004). "The. RF obligations were calculated as the flow due from the shares associated <br />with the net dry-up ~~f 77.0 AF of actual CU out of a total of 194.3 AF of historic actual CU. The <br />lagged stream accretions from historic use were calculated using the same software and methods as <br />the lagged pit depletions. <br />C:\Projects\CODKCOI\Adimin\DKC 2006 SWSP Application.doc 13 Scott Water Engineers, LLC <br />