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Mr. Paul Bruss, P.E. <br /> September 2, 2020 <br /> Page 2 of 6 <br /> by weight of 1,000,000 tons) of water removed from mined material (or the amounts covered <br /> under a Water Court approved plan for augmentation or SWSP approved by the State Engineer, <br /> whichever is more restrictive). <br /> In accordance with the letter dated April 30, 2010 from the Colorado Division of Reclamation, <br /> Mining, and Safety ("DRMS"), all sand and gravel mining operators must comply with the <br /> requirements of the Colorado Reclamation Act and the Mineral Rules and Regulations for the <br /> protection of water resources. The April 30, 2010 letter from DRMS requires that you provide <br /> information to DRMS to demonstrate you can replace long term injurious stream depletions <br /> that result from mining related exposure of groundwater. According to the renewal request, <br /> the long term plan for the site is for a storage reservoir in Phase 2, which already has an <br /> approved slurry wall, and to backfill Phases 1 and 7 to a ground surface elevation at least two <br /> feet higher than the ground water table. Accordingly, Transit Mix obtained a bond for <br /> $2,288,004 through DRMS, an amount sufficient to backfill Phases 1 and 7. According to a <br /> letter dated August 7, 2020, Castle must also provide sufficient Financial Warranty to DRMS. <br /> DEPLETIONS <br /> Annual site depletions during the first plan year (August 1, 2020 through May 31, 2021) consist <br /> of 316.92 acre-feet of gross evaporative losses, 11.0 acre-feet of pumping for dust control, <br /> and 79.80 acre-feet of water filling the Phase 7 pit resulting from the planned cessation of <br /> dewatering, for a total depletion of 407.72 acre-feet. For the purpose of this SWSP, the 79.8 <br /> acre-feet of water filling the Phase 7 pit was projected to occur over one month. <br /> Annual site depletions during the second plan year (June 1, 2021 through May 31, 2022) <br /> consist of 316.92 acre-feet of gross evaporative losses, and 11.0 acre-feet of pumping for dust <br /> control, for a total depletion of 327.92 acre-feet. The monthly distribution of the values and <br /> the lagged effects on the Arkansas River, are detailed in Tables 1-4, which are attached. The <br /> lagged depletions were calculated individually for each Phase of the operation based on the <br /> characteristics below. <br /> � <br /> ran q ni i wv;rvit o f C 7 c qu i 1•ti r�4 a I I n ; t or day li r foot), <br /> S = Spey-tfic yi pld o t"tlic -Li Llii i I 0 . <br /> "% I I A 1 : � r� h � °��riI�w � 1 N r17 11 r r ��ar -�ii t st° Ar ``i1 � I NO' (f <br /> tice t�%etm the A t �m-.Ias RI V t• �I I I{I 111e 'k I I I r L,P I II{1.11I'I (l eet), <br /> Y' {e note that. thQ W di,,;tanc value for the Phase I and Phase I (initial fill) 1 g 1nt; iri uuLi are lffcr n( dLLQ <br /> to do the different locations for the poliii of epletio-n and the varizibility of the afluvial b widar F ill the <br /> l cati li of the.Pu f-)i East Pit. <br /> Lagging factors for each of the Phases were calculated using the Glover Method, normalized <br /> to the number of months required for 95% of depletions to affect the river, and are provided <br /> in the following table. <br />