2019-12-05_HYDROLOGY - M1999058 (4)

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frac tanks located at loadout with 4,000 gallon loads per trip. At 2 pm, a GLA representative arrived onsite to further support the mitigation and remediation effort. At around 3 pm on Wednesday, October 301" the night crew arrived to take over 24 hour operations. However, the CSQ, GLA and HRL representatives agreed to terminate night operations. GLA did mass balance calculations determining potential concentrations and impact to Yule Creek and it was determined that the risk of maintaining pumping with regard to operator safety and current site conditions overweighed the logistics and potential for continued pumping operations. The generators and pumps were turned off at 10 pm. On Thursday, October 31St, activity began at the normal start time of 6:45 am; however, activity was slow to start as the generators needed to be warmed and prep to start following their full shut-down at 10 pm the night before. The two large generators were temporarily turned on to drain all water lines within the Lincoln galleries in preparation of weeks of limited power and thus limited heat in the underground. Limited quarrying activities were to continue to take place underground operating under the use of temporary generators at localized working areas. All available operators were tasked to mitigation efforts which included removal of the pumps at the sump, continued emptying of tanks onsite, and continued shuttling of diesel- laden water from the onsite tanks to the frac tanks at load out. Tanker trucks made two trips per day from the frac tanks at load out to the Greenleaf facility in De Beque. Rapid Energy personnel were onsite to disconnect and move the generator system. CSQ operators were only used to operate heavy equipment or were directly under the supervision of Rapid Energy personnel during the generator moving process. At the close of day Thursday, CSQ representatives decided to change operating hours to 8 am - 4 pm, effectively running 8 hour shifts over a 5-day work week. Also, at the close of the day, the sump was at the 6 foot level with over half of the sump covered with >1 inch thick ice. The location of inflow was obscured by the water surface and wood debris that was frozen in place. On Friday, November 1, 2019, Rapid Energy was again onsite facilitating the disconnection of the generators. Once the generator trailer was removed from its current location — the location of the spill —the upper 6-10 feet of soil was excavated and stockpiled in preparation of soil removal from the site (Figure 21). Stockpiling occurred as HRL was awaiting approval from South Canyon Landfill in Glenwood Springs for import of contaminated soils. The stockpile was located approximately northwest of the previous generator location and allowed enough room for trucks and heavy equipment to use the haul road to the west. Waste marble blocks were moved in preparation of the new generator and fuel area liner installation. 29