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Jared Dains Page 2
<br />South Platte Combined Replacement Plan
<br />March 21, 2011
<br />The area exposed prior to 1981 at the Jeronimus Pit site is shown on the attached
<br />map. The credits for the pre-1981 area are tied to the location identified on the map and may
<br />no longer be re-allocated to other areas of ground water exposure within the gravel pit
<br />permit boundary.
<br />The mining site locations are specified in Table 2 below:
<br />Table 2
<br />Site Name Location WDID
<br />Teti Pit Sections 19 and 20, US, R67W 0203027
<br />North Dahlia Pit Sections 19 and 20, US, R67W 0203028
<br />Jeronimus Pit Section 16, T2S, R67W 0203029
<br />Hazeltine Pit Section 9, US, R67W 0203030
<br />Brighton Pit Sections 14 and 23, T1 S, R67W 0203031
<br />Tucson South Pit Sections 1 and 12, T1 S, R67W 0203032
<br />Tucson Pit Section 1, T1S, R67W 0203033
<br />Wattenberg Pit Sections 25 and 36, TIN, R67W; Section 30, T1 N, R66W 0203034
<br />Platte Valley Pit Section 30, T1 N, R66W 0203035
<br />Distel Pit Sections 7, 8, 9, 17 and 18, T2 N, R68W 0503000
<br />Tull Pit Sections 9,16 and 17, T2N, R68W 0603001
<br />W.W. Farms Pit Sections 32 and 33, T6N, R66W 0303014
<br />F-Street Pit Sections 34 and 35, T6N, R66W 0303015
<br />East 8th Street Pit Sections 4 and 9, T5N, R65W 0303016
<br />The required fee of $3598 (14 sites x $257/site renewal fee) has been submitted (receipt
<br />no. 3648132).
<br />Aggregate anticipates to actively mine three sites in 2011: Tull Pit, Hazeltine Pit, and
<br />Brighton Pit. Depletions resulting from evaporation and mining operations at these sites are
<br />replaced under this plan. Water use at the Tull Pit, Hazeltine Pit and Brighton Pit in 2011 will
<br />include dewatering, evaporation from exposed groundwater, aggregate production, and dust
<br />control. Dewatering is anticipated to begin at Tull Pit in May 2011 at an average rate of 1,100
<br />gallons per minute. The exposed water surface is estimated at 2.0 acres in the dewatering trenches
<br />and small ponds. The average dewatering rate is anticipated to remain at 900 gallons per minute at
<br />the Hazeltine Pit in 2011. The exposed surface area at the Hazeltine Pit has been reassessed
<br />based on the recent aerial photos at 5.6 acres. The dewatering at the Tull Pit and Hazeltine Pit will
<br />result in a net accretion to the river and the dewatering at the Brighton Pit is assumed to offset the
<br />post-pumping depletions from dewatering at the Platte Valley Pit. Continuous dewatering operation
<br />at the Brighton Pit began in 2006 when dewatering operation at the Platte Valley Pit ceased. The
<br />State Engineer's Office ("SEO") approved the liner at the south reservoir of the Brighton Pit on
<br />August 19, 2010, therefore the exposed surface area has been reassessed at 25.3 acres.
<br />Aggregate also has eight sites with exposed surface area that will not be mined in 2011:
<br />Teti Pit, Wattenberg Pit, Platte Valley Pit, North Dahlia Pit, F-Street Pit, Jeronimus Pit, East 8t'
<br />Street Pit, and Tucson Pit. Depletions resulting from evaporation and past pumping depletions at
<br />these sites are replaced under this plan.
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