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6.MONITORING REQUIREMENTS -LAND DISTURBING ACTIVITIES. <br /> Stormwater discharges from any disturbed areas during land grading operations (except for sand and gravel mining operations) shall be monitored <br /> by the permittee as specified below: <br /> Stormwater Discharge Units Monitoring Requirements <br /> Characteristics Measurement Sample Sample <br /> Frequency I= Location <br /> Total Suspended Solids mg/I once/year Grab `DO <br /> Settleable Solids m I/I once/year Grab SDO <br /> Turbidity NTUs once/year Grab SDO <br /> PR Standard once/year Grab SDO <br /> 'Sample Locations: SDO - Stormwater Discharge Outfall <br /> Total precipitation and duration of the event measured shall be a representative storm event. <br /> Storm Event Units Monitoring_R2quirements <br /> Characteristic <br /> Total Event Precipitation inches once/year <br /> Event Duration hours once/year <br />