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c, <br />Table 4.3 Depletion Replacements and RF Table (AF). <br /> Jan Reb 'I~1ar A ~r ~ 1~1a~ Jwi Jul ,1u r Sep Oct No~~ ~ Ucc Total <br />La ed Replacement. 3.2 3.0 3.0 3.6 5.1 6.7 8.1 8.8 _ <br />8.4 6.6 4.9 3.8 65:2' <br />'urface IZF (lbii ation 0.0 0.0 0.0 0.2 5.6 5.5 9.2 6.9 3.4 0.4 0.0 0.0 31:2 <br />Lag eg d Subsurf.:RF OtiliQ<<tioti 1.7 1.4 1.3 1.2 1.4 2.4 3.3 4.2 4.1 3.6 2.6 2.1 29:4' <br />otal Re lace(RF~Obli ation 4.9 4.4 4.3 5.0 12.1 14.6 20.5 20.0 15.9 10.6 7.5 5.9 125:8 <br />The apportionment of CU and return flows can be verified by the following calculations. The <br />average farm headl;ate delivery over the study period was 352.0 AF. The lagged annual replacement <br />of pit depletions lis~,ted in Table 4.3 is 65.2 AF. The actual CU of current irrigation is 117.2 AF, from <br />Table 4.1. Now, subtracting the uses from the deliveries yields 169.6 AF. Further subtracting the <br />CU surplus listed at the bottom of Table 4.1, 9.4 AF, yields 160.2 AF. Finally, if the difference <br />between the total fait depletions, 67.6 AF, and.the lagged pit depletions, 65.2 AF, is subtracted the <br />remainder is 157.8„ an amount equal to the historic return flow calculated in the historic use analysis. <br />4.4.3 Accounting Method <br />The replacement supply amount and timing outlined previously has been based on estimated <br />depletions occurring in the pit. Actual depletions may vary slightly from the numbers outlined in this <br />plan.. DKC will install on metering device on the ground water pump to monitor and record <br />extractions and use:. the accounting form approved in the 2004-2007 SWSP to track deliveries and <br />replacements. The accounting form will allow DKC to keep track of the year-to-date amounts of <br />depletions and diversions to insure that the diversions exceed the depletions at the end of each year. <br />5.0 CONCLUSIONS <br />Based upon the analyses outlined above SWE concludes the following regarding the <br />substitute water supply application for the Timnath Pit: <br />• The annual lagged ground water depletions due to mining are estimated at 65.2 AF. <br />• Replacement water will be supplied via lagged recharge from Boxelder CU credits diverted <br />into the unlined pond in the current mining phase of the Timnath Pit. <br />• It is requestf;d that the plan be approved for a period of two years with the option of renewal. <br />• The applicant will install all measurement structures necessary to administrate the plan. <br />• The applica~7t will maintain monthly records of water diversions and consumptive use. <br />C:\Projects\CODKCOI\Acimin\DKC 2006 SWSP Application.doc 14 Scott Water Engineers, LLC <br />