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Jared Dains <br />South Platte Combined Replacement Plan <br />March 21, 2011 <br />Page 3 <br />Mining operations at the Distel Pit was expected to be completed by the end of 2010. <br />Reclamation is in progress and will continue in 2011. Water use at Distel Pit in 2011 will include <br />dewatering, evaporation from exposed ground water and dust control. Dewatering at the site has <br />been occurring since 1991 and is expected to continue through 2011 at an approximate rate of <br />1,100 gallons per minute. The exposed surface area is estimate to equal 69.2 acres. <br />Mining operations and concrete batching at the W.W. Farms are anticipated to be on hold <br />during the period of this plan. Therefore water use at this site in 2011 will include dewatering, <br />evaporation from exposed groundwater and dust control. The dewatering rate is anticipated to <br />remain at 450 gallons per minute in 2011. The exposed surface area at the W.W. Farms Pit has <br />been updated based on recent aerial photo at 32.4 acres. As mentioned in the previous SWSP <br />approval, Aggregate applied to DRMS to amend the existing area boundary of the W.W. Farms to <br />include the W.W. Farms Expansion area. <br />Mining at the Tucson South Pit has not yet commenced and it is not anticipated that mining <br />will begin during this plan period. <br />Mining and reclamation of the Teti Pit is complete leaving exposed ground water requiring a <br />permanent plan for augmentation. Aggregate filed an application with the water court for a <br />permanent plan of augmentation under case no. 2007CW198. Until such time as a decree is <br />entered in that case, Aggregate will replace depletions from the Teti Pit under this SWSP. <br />Mining at the Platte Valley Pit was completed in 2006. The site has filled with ground water <br />and as mining progresses across the river at the Wattenberg Pit, Aggregate will backfill the Platte <br />Valley Pit with fines produced from the Wattenberg Pit. The exposed surface area at the Platte <br />Valley Pit has been updated based on a recent aerial photo and consists of 78.8 acres. <br />Aggregate does not anticipate actively mining the Wattenberg Pit in 2011. The exposed <br />surface area at the Wattenberg Pit has been updated based on a recent aerial photo and consists <br />of 16 acres. Depletions resulting from evaporation will be replaced under this SWSP. <br />Mining of the North Dahlia Pit is complete and Aggregate has backfilled a portion of the <br />existing lake leaving approximately 3.5 acres of exposed ground water at the Palizza Pond. <br />Aggregate amended the water court application for a plan for augmentation in case no. <br />2007CW198 to include the remaining 3.5 acres exposed at the North Dahlia Pit. Until such time as <br />a decree is entered in that case, Aggregate will replace depletions from the North Dahlia Pit under <br />this SWSP. <br />The Jeronimus Pit is complete and Aggregate is currently filling in the lake at the site with <br />fines from the Hazeltine Pit. Ultimately the entire site will be backfilled. Water use in 2011 will <br />consist solely of evaporation and the current exposed surface area is 22.4 acres of which 13.1 <br />acres were exposed prior to 1981, thereby leaving a net exposed area requiring augmentation of <br />9.3 acres. <br />Aggregate has completed mining at the F-Street Pit and is in the process of reclaiming the <br />site. The dewatering pumps were turned off in 2008 and the post pumping depletions associated <br />with that activity was accounted for in the 2008, 2009 and 2010 SWSPs and will continue to be <br />accounted for in this SWSP. The exposed surface area at the F-Street Pit has been updated based <br />on recent aerial photo at 26.2 acres. Aggregate is working with the landowner and expects to <br />transition the land back to him within the next two years after the reclamation is complete. <br />