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Mr. David M. Heintz Page 2 of 8 <br /> MMM South Platte Combined Replacement Plan <br /> January 8, 2015 <br /> Lafarge transferred the Howe Pit to Denver Water in May 2009 and as such MMM is not <br /> covering any losses due to ground water evaporation at the Howe Pit in this SWSP. Denver Water is <br /> responsible for replacement of evaporative depletions at the Howe Pit site from any unlined lakes <br /> and will submit a separate SWSP request to cover any depletions from the ground water exposed in <br /> those unlined lakes after December 31, 1980. MMM will continue to cover the lagged depletions <br /> resulting from past mining activity at the Howe Pit. This SWSP does not cover any new consumptive <br /> uses at Howe Pit. <br /> Mining at Riverbend West continues to be temporarily ceased and MMM will resume mining <br /> when it becomes economically feasible. MMM does not plan on mining material from the Riverbend <br /> West Site throughout the duration of this SWSP renewal. An amendment to this SWSP must be made <br /> should MMM wish to reactivating mining at the site during this approval period. The consumptive use <br /> at the Riverbend West will consist only of evaporation from exposed groundwater. <br /> The consumptive use at the Riverbend East will consist of evaporation from exposed <br /> groundwater, aggregate production, dust control, and dewatering which is anticipated to continue <br /> during the duration of this SWSP. MMM is the operator of this site but Denver Water is the DRMS <br /> permit holder and has reclamation responsibility at the site. <br /> Depletions <br /> The total annual losses resulting from evaporation, aggregate washing, and dust control are <br /> shown in the following table: <br /> TABLE B - DEPLETIONS' <br /> Evaporation Aggregate Dust Total <br /> Site Name Losses Washing Control Total <br /> ft (ac- <br /> Lagged <br /> (ac-ft) (ac-ft) (ac-ft) ) (ac-ft) <br /> Howe Pit n/a 0 0 0 0.502 <br /> Riverbend West 26.37 0 0 26.37 26.37 <br /> Riverbend East 82.04 55.23 22.59 159.86 154.28 <br /> TOTAL 108.41 55.233 22.59 186.23 181.14 <br /> 1 This table does not take into affect dewatering depletions. <br /> 2 By October 2015 the total monthly lagged depletions will equal 0.02 acre-feet. After October 2015 <br /> the remaining depletions will equal to or less than 0.01 percent of the historical pumping. Therefore <br /> the remaining 0.21 acre-feet of lagged depletions will be replaced in October 2015 <br /> 3 Depletions associated with mining of 1,876,500 tons of aggregate <br /> Due to water quality issues, MMM uses water from five wells at the Riverbend East site for <br /> washing material and dust control of road and stock piles. MMM will pump water for industrial uses <br /> from the following wells: 1657-RR (WDID 0208500), 2819-FR (WDID 0208639), 19944-RR (WDID <br /> 0205187), 20317-RR (WDID 0207417) and 20583-R (WDID 0205190). All of the wells are located within <br /> the gravel permit boundary in sections 18 and 19, Township 1 North, Range 66 West, 6th P.M. All five <br /> wells are permitted for irrigation purposes and they are included in the Ground Water Management <br /> Subdistrict of the Central Colorado Water Conservancy District ("Central GMS") augmentation plan <br /> approved by the Division 1 Water Court in case no. 2002CW335. Lafarge obtained new well permits to <br />