2019-01-30_HYDROLOGY - M1977436 - Laserfiche WebLink

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Aggregate Industries South Platte Combined SWSP January 30, 2019 Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, and 5475 Page 2 of 21 The general location of the mining sites are identified in Table B below and depicted on the attached Figure 1. Table B – Pit Locations Site Name Location Jeronimus Pit Section 16, T2S, R67W Hazeltine Pit Section 9, T2S, R67W Brighton Pit Sections 14 and 23, T1S, R67W Tucson South Pit Sections 1 and 12, T1S, R67W Wattenberg Pit Sections 25 and 36, T1N, R67W; Section 30, T1N, R66W Platte Valley Pit Section 30, T1N, R66W Distel Pit Sections 7, 8, 9, 17 and 18, T2N, R68W Tull Pit Sections 9, 16 and 17, T2N, R68W W.W. Farms Pit Sections 32 and 33, T6N, R66W F-Street Pit Sections 34 and 35, T6N, R66W This SWSP previously included the Teti Pit (WDID 0203027)and the North Dahlia Pit (WDID 0203028).A plan for augmentation for these two sites was decreed in water court case no. 2007CW198 on December 17,2013 and all depletions from these sites will be replaced under the decreed plan for augmentation.It is noted that the East 8th Street Pit (M-2000-082,WDID 0303016)is no longer a part of this Combined SWSP.Aggregate sold this pit to Superior Oilfields and as of November 2012 this pit is no longer covered by Aggregate.All depletions impacting the river are now covered under the East 8th Street SWSP (WDID 0302562). The Tucson Pit (M-1991-140,WDID 0203033)was previously included in this SWSP.Mining operations at the Tucson Pit have been completed,and a request for a full performance and financial warranty release for the Tucson Pit was approved by the DRMS on April 29,2016.A portion of the pit (Rogers Reservoir,WDID 0203917)has been lined with a slurry wall and has obtained SEO liner approval.All post-pumping depletions have been replaced under previous SWSPs.The remaining 2.0-acre pond is located within the boundaries of the Tucson South Pit and will be accounted for and reclaimed under that permit. A summary of the pit operations at each of the ten (10) sites remaining in this SWSP is provided below. Jeronimus Pit (South Platte Mainstem) Status: Mining operations at the Jeronimus Pit are complete. Operations on-site include backfilling of the pit with inert fill. Depletions covered by this SWSP are limited to water lost due to evaporation. The total surface area exposed at the site is 20.3 acres, of which 14.7 acres were exposed to the atmosphere prior to January 1, 1981. The 14.7-acre area exposed at the Jeronimus Pit prior to 1981 is tied to the location as shown on the exhibit dated January 31, 2011 as provided in the 2011 SWSP. The credits for the pre-1981 area are tied to the location identified on that map and may not be re-allocated to other areas of groundwater exposure within the gravel pit permit boundary. Exposed Groundwater Surface: 5.6 acres post-81, 14.7 acres pre-81 Active Dewatering: No