2019-12-05_HYDROLOGY - M1999058 (4)

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By mid-afternoon, the immediately available tank space provided by CSQ was exhausted and plans began to collect and repair other water tanks located throughout the site; final tank arrangements are shown in Figure 10. A total of—70,000 gallons of tank space was made available, not including mobile water trucks and tankers. Immediate calls were made to HRL requesting that more water tankers and water trucks be deployed to the site to collect additional water. One 20,000 gallon frac tank was ordered by HRL and delivered to the site at loadout. Over the course of the evening, the site's water truck transported multiple 4,000 gallon loads of contaminated water from the pump, and also from the filled tanks on the haul road, to the frac tank. Also, around mid-afternoon, snowfall and wind speeds began to rise while temperatures continued to drop. The resultant —10-25°F temperatures with wind chills into the negative Fahrenheit values created an extremely difficult outside working environment. The rate of inflow to the sump did not slow at any time during the first days pumping efforts and, near the close of business on October 29tn it became apparent that more tank space would be needed to accommodate the rate of pumped water from the sump throughout the night. Also, near the close of business on October 29tn, it was determined that the quarry did not have the necessary tank volumes on hand, nor would it be possible to get the necessary tank volumes delivered prior to the start of business on Wednesday to accommodate the much higher than anticipated flow into the sump throughout the night. Therefore, emergency excavation began to build up the berm along the northern edge of the sump (Figure 16). This berm was refortified with colluvium, marble block, and soil from the adjacent slope to the south. The berm was compacted with an excavator with the intention that diesel laden surface water would be trapped, while potentially clean water would seep through the berm. 23