2011-03-21_HYDROLOGY - M1989120 - Laserfiche WebLink

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Jared Dains Page 4 South Platte Combined Replacement Plan March 21, 2011 The East 8th Street Pit was not mined last year as planned and Aggregate does not anticipate to actively mine the site in 2010. Due to lack of mining activity the dewatering ceased after February 2009, therefore the water use at the East 8th Street Pit in 2010 will include post pumping dewatering depletions and evaporation from exposed ground water. The exposed surface area at the East 8th Street has been updated to 5.8 acres. Mining at the Tucson Pit is complete and reclamation is in progress. The SEO approved the liner for this pit (Rogers Reservoir) on June 18, 2010. The previous SWSP anticipated that there would be a post-dewatering fill of the pit which would cause depletions to the river. However, due to the liner the post-dewatering fill did not occur. Water use at this site in 2011 will include evaporation from exposed ground water in a small pond of approximately 2 acres located south of the lined pit and dust control. The final reclamation plan for each site, the bond amount and the water commitment to replace depletions in the event that the operator ceases dewatering and walks away from the site is shown in Table 3 below. Table 3 Site Name DMG # Proposed Final Reclamation Bond Amount Ditch Rights Committed/Comments Teti Pit M-99-090 ground water Lake $77,600 2007CW198-pending North Dahlia Pit M-94-093 lined reservoir $744,000 Aggregate backfilled a portion, a small groundwater lake remaining on the site that will be covered b 2007CW198- endin Jeronimus Pit M-75-039 backfilled $32,500 none Hazeltine Pit M-04-031 lined reservoir $670,602 none Brighton Pit M-77-436 lined reservoir $1,579,400 none Tucson South Pit M-04-044 lined reservoir $11,000 none Tucson Pit M-91-140 lined reservoir $811,000 none Wattenberg Pit M-01-008 lined reservoir $3,617,200 Westminster 1998 Lease (294.79 ac-ft) Platte Valley Pit M-89-120 backfilled $754,732 none Distel Pit M-89-029 ground water Lake $1,483,800 52.5% Coffin & Davis Ditch (172.2 ac-ft CU) Tull Pit M-94-027 ground water Lake $350,775 1 Share Smith & Emmons Ditch (61.1 ac-ft) W.W. Farms Pit M-99-098 lined reservoir $155,480 13.5 Shares of Whitney Ditch (186.21 ac-ft CU F-Street Pit M-92-069 ground water Lake $249,008 240 Shares Boyd & Freeman (99.28 ac-ft CU East 8th Street Pit M-00-082 ground water Lake $226,000 City of Greeley has long term augmentation responsibility In accordance with the letter dated April 30, 2010 (copy attached) from the Colorado Division of Reclamation, Mining, and Safety ("DRMS"), all sand and gravel mining operators must comply with the requirements of the Colorado Reclamation Act and,the Mineral Rules and Regulations for the protection of water resources. The April 30, 2010 letter from DRMS requires that you provide information to DRMS to demonstrate you can replace long term injurious stream depletions that result from mining related exposure of ground water. The DRMS letter identifies four approaches to satisfy this requirement.