2018-10-22_REVISION - M2008078 (12)

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PART I Page 31 of 67 Permit No.:COG500000 e. Benchmark Monitoring Actions—Data exceeding benchmarks i) If the averaged monitoring values for any parameter,at a specific outfall,exceeds the benchmark,as described in a)through c) below,the permittee must conduct corrective action in accordance with Part LK—Corrective Actions of this permit. a) The average of the initial 4 quarterly sample monitoring values for any parameter exceeds the benchmark. b) If less than 4 benchmark samples have been taken, but the sum of the quarterly sample results to date is more than 4 times the benchmark level(i.e.,an exceedance of the 4 quarter average is mathematically certain),this is considered a benchmark exceedance. c) If any of the annual samples taken after the first 4 quarterly samples(i.e.,samples 5 through 8),when averaged with the proceeding samples,causes an average monitoring value that exceeds the benchmark for any parameter,this is considered a benchmark exceedance. ii) Following control measure(s)modification,the permittee must continue quarterly monitoring for 4 additional quarters. For this monitoring: a) if the average of the monitoring values for any parameter does not exceed the benchmark,the permittee may monitor once-per-year as described in Part 1.1.2.d,above. b) If the average of the monitoring values for any parameter still exceeds the benchmark(or if an exceedance of the benchmark by the 4 quarter average is mathematically certain prior to conducting the full 4 additional quarters of monitoring),the permittee must again conduct corrective actions consistent with Part LK(Corrective Actions)of this permit unless the Division waives the requirement for additional monitoring and corrective action. 3. Water QualitV Standards Monitoring a. Applicability of water quality standards monitoring Consistent with the provisions in Part I.C.2.,the Division may apply monitoring conditions(i.e.,sampling parameters, sampling frequency,and sample type)in the permit certification issued to a permittee for discharges to impaired waters, discharges to waters designated as critical habitat for threatened and endangered species,and other discharges as necessary to determine if compliance with the other terms and conditions of the permit will control discharges as necessary to meet water quality standards. Monitoring conditions will be consistent with applicable water quality standard(s)for the receiving water,and as applicable,the assumptions of any available wasteload allocation in an applicable TMDL. Water quality standards monitoring is only required at a facility if specified in the certification. b. Monitoring Frequency and modification When specified in the certification,the permittee must monitor discharges once per quarter at each outfall(except substantially identical outfalls)discharging stormwater to impaired waters. c. Modifying Monitoring Requirements A permittee may request modification of the water quality standards monitoring requirements required by the permit certification if,after one year of monitoring or 4 samples,a pollutant,at a specific outfall, is not detected above the applicable,end-of-pipe water quality standard in any sample. 4. Additional Monitoring Required by the Division The Division may notify a permittee of additional discharge monitoring requirements. Any such notice will briefly state the reasons for the monitoring,locations,and monitoring parameters,frequency and period of monitoring,sample types,and reporting requirements.Such monitoring may include salinity and in-stream sampling and whole effluent toxicity testing.