2021-02-17_PERMIT FILE - C1980007

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PART I Page 12 of 68 Permit No.: C00038776 00918 Calcium (mg/1) Report Report 2 Days/Month Grab 00921 Magnesium (mg/1) Report Report 2 Days/Month Grab 00923 Sodium (mg/l) Report Report 2 Days/Month Grab 00440 Bicarbonate nate as HCO3 Report Report 2 Days/Month Grab 00931 SAR calculated limit* Report Report 2 Days/Month Calculated 00931 Adjusted SAR Report Report 2 Days/Month Calculated effluent** 00094 EC (dS/m) Report 2 Days/Month Grab WET, acute until 9/30/21 LC50 Statre 96Hr TANK Acute Pimephales Report;LC50 > 100 Quarterly Grab promelas TAM3C LC50 Statre 48Hr Report; Acute Daphnia magna LC50 > 100 Quarterly Grab WET, acute beginning 10/1/21 LC50 Statre 96Hr TANK Acute Pimephales LC50 > 100 Quarterly Grab promelas TAM3C LC50 Statre 48Hr LC50 > 100 Acute Daphnia mogno _ Quarterly Grab *This SAR limit is to be calculated using the actual measured EC value (30-day average) of the effluent and substituting this value in to the following equation to solve for SAR. The equation for determining the SAR limit is: SAR = (7.1 * EC) - 2.48. ** The SAR value of the effluent is to be reported as the adjusted SAR. See the definitions section in Part I.C.17 for information on calculating the adjusted SAR value. ALTERNATE LIMITATIONS Any discharge or increase in the volume of a discharge is caused by precipitation within any 24-hour period less than or equal to the 10-year, 24-hour precipitation event (or snowmelt of equivalent volume) may comply with alternate limitations subject to burden of proof requirements as described in the EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS section. The following limits for Fe(TR) and Settleable Solids may be substituted for the Fe(TR) and TSS limitations contained in the previous table. All other parameters remain unchanged. Alternate Limits Outfall 005 (less than or equal to the 10-year, 24-hour precipitation event) ICIS Effluent Limitations Maximum Concentrations Monitoring Requirements Effluent Parameter Code 30-Day Average 7-Day Daage Daily Maximum Frequency Sample Type 00980 Fe, TR (Ng/l) 3500 Report Monthly Grab 00545 Settleable Solids (ml/l) Report 0.5 Monthly Grab ALTERNATE LIMITATIONS Any discharge or increase in volume of a discharge caused by precipitation within any 24-hour period greater than the 10-year, 24-hour event (or series of storms or snowmelt of equivalent volume) may comply with alternate limitations subject to burden of proof requirements as described in the EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS section. The following limit for Fe(TR) may be substituted for that contained in the previous table. TSS and Settleable Solids monitoring/ effluent limitations are not required. All other parameters remain unchanged. Alternate Limits Outfall 005 (greater than the 10-year, 24-hour precipitation event)