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Aggregate Industries South Platte Combined SWSP June 1, 2021
<br /> Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, 8t 6090 Page 2 of 23
<br /> The general location for each of the mining sites is identified in Table B below and depicted
<br /> on the attached "Figure 1-Aggregate Industries Combined SSP Vicinity Map".
<br /> Table B - Pit Locations
<br /> Site Name Location
<br /> Jeronimus Pit Section 16 T2S R67W
<br /> Hazeltine Pit Section 9, T2S, R67W
<br /> Brighton Pit Sections 14 and 23, T1 S, R67W
<br /> Tucson South Pit Sections 1 and 12 T1 S R67W
<br /> Wattenberg Pit Sections 25 and 36, T1 N, R67W; Section 30, T1 N, R66W
<br /> Platte Valley Pit Section 30, T1 N, R66W
<br /> Distel Pit Sections 7, 8, 9, 17 and 18, T2N, R68W
<br /> Tull Pit Sections 9 16 and 17 T2N R68W
<br /> Irwin-Thomas Pit Section 11 T2N R69W
<br /> Fredstrom Pit Section 36, T3N, R70W; Section 31, T3N, R69W; Section 6, T2N, R69W
<br /> W.W. Farms Pit Sections 32 and 33, T6N, R66W
<br /> F-Street Pit Sections 34 and 35 T6N R66W
<br /> This SWSP previously included the Teti Pit (WDID 0203027) and the North Dahlia Pit (WDID
<br /> 0203028). A plan for augmentation for these two sites was decreed in water court case no.
<br /> 2007CW198 on December 17, 2013 and all depletions from these sites will be replaced under the
<br /> decreed plan for augmentation. The East 8th Street Pit (M-2000-082, WDID 0303016) is no longer a
<br /> part of this Combined SWSP. Aggregate sold the East 8th Street Pit to Superior Oilfields and as of
<br /> November 2012 this pit is no longer covered by Aggregate. All depletions impacting the river are now
<br /> covered under the East 8th Street SWSP (WDID 0302562). The Tucson Pit (M-1991-140, WDID 0203033)
<br /> was also previously included in this SWSP. Mining operations at the Tucson Pit have been completed,
<br /> and a request for a full performance and financial warranty release for the Tucson Pit was approved
<br /> by the DRMS on April 29, 2016. A portion of the Tucson Pit (Rogers Reservoir, WDID 0203917) has
<br /> been lined with a slurry wall and has obtained SEO liner approval. All post-pumping depletions
<br /> associated with the Tucson Pit have been replaced under previous SWSPs. The remaining 2.0-acre
<br /> pond is located within the permit boundaries of the Tucson South Pit and will be accounted for and
<br /> reclaimed under that permit.
<br /> The Irwin-Thomas Pit (Plan ID 5829, WDID 0505626) and the Fredstrom Pit (Plan ID 6090, WDID
<br /> 0505629) operated under individual SWSPs in 2019. These two sites were incorporated into this SWSP
<br /> starting in the 2020 plan period.
<br /> A summary of the mining operations at each of the twelve (12) sites included in this SWSP is
<br /> provided below.
<br /> Jeronimus Pit Status: Resource extraction at the Jeronimus Pit is complete. Operations on-site
<br /> (South Platte include backfilling of the pit with inert fill. Depletions covered by this SWSP are
<br /> Mainstem) limited to water lost due to evaporation. The total surface area exposed at the
<br /> site is 20.3 acres, of which 14.7 acres were exposed to the atmosphere prior to
<br /> January 1, 1981. The 14.7-acre area exposed at the Jeronimus Pit prior to 1981
<br /> is tied to the location as shown on the exhibit dated January 31, 2011 as
<br /> provided in the 2011 SWSP. The credits for the pre-1981 area are tied to the
<br /> location identified on that map and may not be re-allocated to other areas of
<br /> groundwater exposure within the gravel pit permit boundary.
<br /> Exposed Groundwater Surface: 5.6 acres post-81, 14.7 acres pre-81
<br /> Active Dewatering: No
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