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Aggregate Industries South Platte Combined SWSP April 13, 2018 <br />Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, and 5475 Page 3 of 20 <br /> <br />flooding of adjacent property. The operator has installed a gravity drain <br />to dewater the site on a continuous basis. A 45-day leak test was <br />performed after installation of the permanent drain to verify that the <br />liner was not impacted. The liner was re-approved in a letter dated <br />March 22, 2018. Depletions covered by this SWSP are limited to lagged <br />depletions from past operations at the site, including past dewatering. <br />Exposed Ground Water Surface: 0 <br />Active Dewatering: No <br />Brighton Pit <br />(South Platte <br />Mainstem) <br />Status: Mining operations at the Brighton Pit are complete and <br />reclamation is in progress. Depletions covered by this SWSP include <br />water lost due to evaporation and post-pumping dewatering depletions. <br />The south and central reservoirs are lined with a slurry wall (WDIDs <br />0203031 and 0203385) and have obtained SEO liner approval. <br />Reclamation work includes backfilling the remaining exposed areas, of <br />which 1 acre was backfilled in 2013. <br />Exposed Ground Water Surface: 5.0 acres <br />Active Dewatering: No <br />Tucson South Pit <br />(South Platte <br />Mainstem) <br />Status: Mining operations have not started at Tucson South Pit, and are <br />not anticipated to occur during this plan period. This SWSP covers no <br />depletions at this site, other than depletions associated with the 2 acre <br />pond transferred from the Tucson Pit. <br />Exposed Ground Water Surface: 2.0 acres transferred from the Tucson <br />Pit <br />Active Dewatering: No <br />Wattenberg Pit <br />(South Platte <br />Mainstem) <br />Status: Aggregate intends to continue actively mining the Wattenberg Pit <br />during 2018. Depletions covered by this SWSP include water lost due to <br />evaporation, aggregate production, dust control, and dewatering. Prior <br />to 2018, the north pit was dewatered with water delivered to the nearby <br />Broda Pond. The north cell has since been lined, and dewatering <br />operations will shift to the south cell with water to be discharged into <br />the adjacent Huett Seepage Ditch. There was a temporary cessation of <br />dewatering in January. The site will be dewatered continuously for the <br />remainder of 2018. <br />Exposed Ground Water Surface: 5.0 acres <br />Active Dewatering: YES <br />Platte Valley Pit <br />(South Platte <br />Mainstem) <br />Status: Mining operations at the Platte Valley Pit are not anticipated to <br />occur in 2018, though reclamation activity consisting of backfilling <br />portions of the site will continue in 2018. Depletions covered by this <br />SWSP include water lost due to evaporation, dust control, and concrete <br />batching. Water for concrete batching will come from Well Permit No. <br />13410-F-R (WDID 0207073). Note that the water right for this well was on <br />the division engineer’s 2010 Decennial Abandonment List, but the well <br />may still be used in accordance with its permit as long as all depletions <br />are treated as junior to all other vested water rights in accordance to this <br />SWSP and the well complies with the South Platte Well Measurement <br />Rules. <br />Exposed Ground Water Surface: 75.6 acres <br />Active Dewatering: No