| On 5/14/2025, GUTTERSEN 6MR-31QT HZ tank battery decommissioning activities were completed. During the completion of the activities, no potential presence of impacted material(s) was observed/smelled. Consistent with Rule 912, samples were collected and analyzed to determine whether any constituents are present at levels in excess of Table 915-1 standards. Final laboratory analytical results received on 5/28/2025 indicate that soil samples, AST11 and AST12, discovered beneath the aboveground storage tank, exceeded ECMC Table 915 standards for 1-methylnaphthalene at 0.0095 mg/kg and 0.0115 mg/kg. This will be considered one release since the aboveground storage tanks are in close proximity. Groundwater was not encountered during decommissioning activities. |