2009-12-22_HYDROLOGY - M1977436 - Laserfiche WebLink

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Jared Dains South Platte Combined Replacement Plan December 21, 2009 The mining site locations are specified in Table 2 below: Table 2 Page 2 _ T 7 Site Name Location WDID Teti Pit Sections 19 and 20, T2S, R67W 0203027 North Dahlia Pit Sections 19 and 20, T2S, R67W 0203028 Jeronimus Pit Section 16, T2S, R67W 0203029 Hazeltine Pit Section 9, T2S, R67W 0203030 Brighton Pit Sections 14 and 23, T1 S, R67W 0203031 Tucson South Pit Sections 1 and 12, T1 S, R67W 0203032 Tucson Pit Section 1, T1S, R67W 0203033 Wattenberg Pit Sections 25 and 36, TIN, R67W; Section 30, T1 N, R66W 0203034 Platte Valley Pit Section 30, T1 N, R66W 0203035 Distel Pit Sections 7, 8, 9, 17 and 18, T2N, R68W 0503000 Tull Pit Sections 9, 16 and 17, T2N, R68W 0603001 W.W. Farms Pit Sections 32 and 33, T6N, R66W 0303014 F- Street Pit Sections 34 and 35, T6N, R66W 0303015 East 8th Street Pit Sections 4 and 9, T5N, R65W 0303016 The required fee of $3598 (14 sites x $257 /site renewal fee) has been submitted. Aggregate previously operated Stegner Pit (M -99 -021) under the combined SWSP. The State Engineer approved the clay liner for the Stegner Pit, which eliminated the need to replace new depletions from the evaporation of exposed ground water. Because there are no longer lagged depletions that affect the stream from the previously mined site at Stegner Pit, you did not include this site in the SWSP. Aggregate anticipates to actively mine four sites in 2010: W. W. Farms Pit, Distel Pit, Hazeltine Pit, and Brighton Pit. Depletions resulting from evaporation and mining operations at these sites are replaced under this plan. Water use at the W.W. Farms during the period of this plan will include dewatering, evaporation from exposed groundwater, aggregate production, dust control and concrete batching. The dewatering rate is anticipated to remain at 450 gallons per minute in 2010. The exposed surface area at the W.W. Farms Pit has been updated based on recent aerial photo. As mentioned in the previous SWSP approval Aggregate applied to DRMS to amend the existing area boundary of the W.W. Farms to include the W.W. Farms Expansion area. Water use at the Distel Pit, Hazeltine Pit and Brighton Pit in 2010 will include dewatering, evaporation from exposed groundwater, aggregate production, and dust control. The average dewatering rate is anticipated to remain at 1,100 gallons per minute (Distel Pit) and at 900 gallons per minute (Hazeltine Pit) in 2010. The dewatering at the Hazeltine Pit will result in a net accretion to the river and the dewatering at the Brighton Pit is assumed to offset the post - pumping depletions from dewatering at the Platte Valley Pit. The exposed surface area at the Distel Pit has been updated based on recent cross - section drawing performed for the Distel Pit well permit submitted on August 20, 2009. The exposed surface area at the Hazeltine Pit and Brighton Pit will remain at 2.3 acres and 30.7 acres respectively. Aggregate also has eight sites with exposed surface area that will not be mined in 2010: Teti Pit, Wattenberg Pit, Platte Valley Pit, North Dahlia Pit, F- Street Pit, Jeronimus Pit, East 8`'