2024-06-18_HYDROLOGY - M1977436 - Laserfiche WebLink

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Holcim South Platte Combined SWSP June 18, 2024 Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, F± 6243 Page 2 of 26 The general location for each of the mining sites is identified in Table B below and depicted on the attached "Figure 1-Aggregate Industries Combined SSP Vicinity Map". 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, T1 S, R67W Tucson South Pit Sections 1 and 12 T1 S R67W Wattenberg Pit Sections 25 and 36, T1 N, R67W; Section 30, T1 N, R66W Platte Valley Pit Section 30, T1 N, R66W DPG Pit Sections 1 and 12, TSN, R65W Distel Pit Sections 7 8 9 17 and 18 T2N R68W Tull Pit Sections 9, 16 and 17, T2N, R68W Irwin-Thomas Pit Section 11, T2N, R69W 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. The East 8th Street Pit (M-2000-082, WDID 0303016) is no longer a part of this Combined SWSP. Holcim sold the East 81h Street Pit to Superior Oilfields and as of November 2012 this pit is no longer covered by Holcim. 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 also 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 Tucson Pit (Rogers Reservoir, WDID 0203917) has been lined with a slurry wall and has obtained SEO liner approval. All post-pumping depletions associated with the Tucson Pit have been replaced under previous SWSPs. The remaining 2.0-acre pond is located within the permit boundaries of the Tucson South Pit and will be accounted for and reclaimed under that permit. The Fredstrom Pit (Plan ID 6090, WDID 0505629) operated under an individual SWSP in 2019 and was incorporated into this SWSP starting in the 2020 plan period. Holcim never began mining at that site and no longer intends to mine it and this pit is no longer included in this SWSP. The Irwin-Thomas Pit (Plan ID 5829, WDID 0505626) operated under an individual SWSP in 2019 and was incorporated into this SWSP starting in the 2020 plan period. The DPG Pit (Plan ID 6243, WDID 0307924) operated under an individual SWSP in 2022 and 2023 and was incorporated into this SWSP starting in the 2024 plan period. A summary of the mining operations at each of the twelve (12) sites included in this SWSP is provided below. Jeronimus Pit Status: Resource extraction at the Jeronimus Pit is complete. Operations on-site (South Platte include backfilling of the pit with inert fill. Depletions covered by this SWSP are Moinstem) limited to water lost due to evaporation. The total surface area exposed at the site is 19.2 acres, of which 14.7 acres were exposed to the atmosphere prior to January 1, 1981 ("pre-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.