Water Quality Objectives Parameter Test Method Detection Units WQO limit (min) Turbidity (during Field test with 1 NTU 15 NTU above natural activities for calibrated portable background work) instrument (Measured at downstream sampling location) Turbidity (during Field test with 1 NTU 1. Where natural turbidity is activities calibrated portable less than 1 NTU, increases excluding instrument must not exceed 2 NTU. work) (Measured at 2. Where natural turbidity is downstream between 1 and 5 NTUs, sampling location) increases must not exceed 1 NTU. 3. Where natural turbidity is between 5 and 50 NTUs, increases must not exceed 20 percent. 4. Where natural turbidity is between 50 and 100 NTUs, increases must not exceed 10 NTUs. 5. Where natural turbidity is greater than 100 NTUs, increases must not exceed 10 percent. Settleable Observed -- ml/L Greater than 0.1 ml/L material Water Quality Objectives Parameter Test Method Detection Units WQO limit (min) pH Field test with 0.2 pH Lower NAL = 6.5 calibrated portable Upper NAL = 8.5 instrument And any change greater than 0.5 units from natural background Turbidity Field test with 1 NTU 20 percent above natural calibrated portable background instrument Temperature Field test with 1 °F 1 degree above natural calibrated portable background instrument Dissolved oxygen Field test with 1 mg/L Must not be reduced below 7 calibrated portable mg/L instrument Total dissolved Field test with 1 mg/L Greater than 100 mg/L solids calibrated portable instrument a Specific Field test with 0.1 Must not exceed 175 at 77 μΩ μΩ conductance calibrated portable °F instrument a Portable instrument provides an estimate of Total Dissolved Solids (TDS).
Water Quality Objectives Parameter Test Method Detection limit (min) Units WQO Turbidity (during activities for work) Field test with calibrated portable instrument (Measured at downstream sampling location) 1 NTU 15 NTU above natural background Turbidity (during activities excluding work) Field test with calibrated portable instrument (Measured at downstream sampling location) 1 NTU 1. Where natural turbidity is less than 1 NTU, increases must not exceed 2 NTU. 2. Where natural turbidity is between 1 and 5 NTUs, increases must not exceed 1 NTU. 3. Where natural turbidity is between 5 and 50 NTUs, increases must not exceed 20 percent. 4. Where natural turbidity is between 50 and 100 NTUs, increases must not exceed 10 NTUs. 5. Where natural turbidity is greater than 100 NTUs, increases must not exceed 10 percent. Settleable material Observed -- ml/L Greater than 0.1 ml/L Water Quality Objectives Parameter Test Method Detection limit (min) Units WQO pH Field test with calibrated portable instrument 0.2 pH Lower NAL = 6.5 Upper NAL = 8.5 And any change greater than 0.5 units from natural background Turbidity Field test with calibrated portable instrument 1 NTU 20 percent above natural background Temperature Field test with calibrated portable instrument 1 °F 1 degree above natural background Dissolved oxygen Field test with calibrated portable instrument 1 mg/L Must not be reduced below 7 mg/L Total dissolved solids Field test with calibrated portable instrument a 1 mg/L Greater than 100 mg/L Specific conductance Field test with calibrated portable instrument 0.1 μΩ Must not exceed 175 μΩ at 77 °F a Portable instrument provides an estimate of Total Dissolved Solids (TDS).
13-11_A07-19-13.docx