Agenda - 10-14-1993 - D 1 attch - Laserfiche WebLink

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5.EFFLUENT LIMITATIONS AND MONITORING REC]UIREMENTS-MINE DEWATERING AND/OR OVERFLOW FROM FACILITIES THAT RECYCLE PROCESS WASTEWATER Mine dewatering and/or overflow from facilities that recycle process wastewater shall be limited and monitored by the permittee as specified below: Effluent Characteristics Discharge Limitations Monitoring Requirements Units (specify) Measurement Sample Sample Mon. Ava. Daily Max. Frequency I= Location Total Flow1 E Settleable Solids 0.1 ml/I 0.2 ml/I Monthly Grab E Turbidity2 Monthly Grab E Total Suspended Solids 3 Monthly Grab E Total Suspended Solids 4 Monthly Grab E ° Sample Locations: E - Effluent 1 Total Flow shall be continuous flow measurement. Alternatively, pump curves and pump logs may be used as a means to record flow. 2 Turbidity monthly average limitation: Trout waters 10 NTUs Non-trout lakes and all saltwaters 25 NTUs Freshwater non-trout streams 50 NTUs Total Suspended Solids for Industrial Sand Mining shall be limited to a monthly average of 25 mg/I and a daily maximum of 45 mg/l. 4 Total Suspended Solids for Phosphate Rock Mining shall be limited to a monthly average of 30 mg/I and a daily maximum of 60 mg/l. BMP Conditions 1. The permittee shall utilize best management practices to ensure that contaminants do not enter the surface waters as a result of blasting at the site. 2. The permittee shall obtain authorization from the Division of Environmental Management prior to utilizing any chemical additive for purposes of flocculation. The pi-I shall not be less than 6.0 standard units nor greater than 9.0 standard units in fresh waters, and shall not be less than 6.8 standard units nor greater than 8.5 standard units for salt waters, and shall be monitored monthly at the effluent by grab samples. (The pH for discharges into streams designated swamp waters may be lower.) There shall be no discharge of floating solids or visible foam in other than trace amounts.