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i <br /> On the morning of Saturday, October 12, 2019, diesel sheen was first smelled and <br /> discovered immediately west of the generator trailer within the road alignment (Figure 5). <br /> Recent rains and typical morning dew wet the area and did not allow for full <br /> characterization of the surface spill stain. Furthermore, the fuel area footprint is dark in <br /> color and soil staining was unobservable. At the time, the spill was assumed to be minor. <br /> y <br /> off.. <br /> Figure 5. View of diesel spill near the generator Conex and Clean Pak totes filled with <br /> contaminated soils. Photo captured Wednesday, October 16, 2019; view to the east- <br /> southeast. <br /> Midday on Saturday, October 12, 2019, the CSQ General Manager was operating an <br /> excavator to repair some erosion along the creek diversion when he was alerted to diesel <br /> sheen on the sediment sump below the toe of the road fill (Figure 6). The General <br /> Manager immediately proceeded to the toe of the fill material and refortified the already <br /> in place sump. This action to armor the sump is the start of emergency mitigation actions <br /> for the October 2019 diesel spill incident. <br /> 11 <br />