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51

Effluent grab samples for toxicity testing were collected on September 8, 10, and 12, 2014. Effluent grab samples for biological and chemical analyses for this facility were collected on September 8, 2014. All samples were collected from the EFF-01 NPDES sampling point for Outfall D-001. • The total ammonia concentration in the grab sample collected and preserved for chemical analysis was 0.04 mg N/L. Based on the pH, salinity, and temperature of the effluent as collected, the calculated unionized ammonia concentration was < 0.02 mg/L. • The effluent’s iron (1080 ug/L) exceeded Class III Fresh Water Criteria and the permitted limit. Turbidity and alkalinity were detected in the effluent at levels that comply with Class III Fresh Water Quality Criteria (62-302.530, F.A.C.) and/or permitted limits. Total suspended solids, fluoride, arsenic, total chromium and nickel were detected between the laboratory method detection limits (MDL) and practical quantitation limits (PQL). • The overflow lab did not have enough sample volume to perform QC and analyze Radium 228, therefore, no Radium 228 results were reported. • Nitrate + nitrite was detected in the field blank.

57

DEP Mining and Minerals Regulation Program staff conducted an inspection of the Chemours Trail Ridge Mine on October 27, 2015, including the West Levee and the portion of the SRWMD’s West Ridge Property located within the Trail Ridge Mine, and found no evidence of uncontrolled discharges of surface water to adjacent properties or offsite sedimentation impacts. SRWMD have found no evidence that the surface water channel on the West Ridge property has caused sedimentation impacts or offsite flooding on adjacent or downstream properties in Bradford County.