2018-10-22_REVISION - M2008078 (12)

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PART I Page 30 of 67 Permit No.:COG500000 vi. Suspended solids; vii. Foam; viii. Oil sheen; and ix. Other obvious indicators of stormwater pollution. c. Quarterly Visual Assessment Documentation. The permittee must document the visual assessment results and maintain this documentation onsite with the facility SWMP as required in Part I.M.8. The permittee is not required to submit visual assessment findings to the Division, unless specifically requested to do so. At a minimum,visual assessment documentation of the must include: i. Sample location(s); ii. Sample collection date and time,and visual assessment date and time for each sample; iii. Personnel collecting the sample and performing visual assessment,and their signatures; iv. Nature of the discharge(i.e., runoff or snowmelt); v. Results of observations of the stormwater discharge; vi. Probable sources of any observed stormwater contamination;and vii. If applicable,why it was not possible to take samples within the first 30 minutes. d. Quarterly Visual Assessment Corrective Actions: If the visual assessment indicates the control measures for the facility are inadequate or are not being properly operated and maintained,the permittee must conduct corrective actions consistent with Part I.K(Corrective Actions)of this permit. e. The permittee shall maintain visual monitoring procedures in the SWMP as required in Part I.M.8. 2. Benchmark Monitorine This permit provides pollutant benchmark concentrations that may be applicable to the discharge authorized by this permit. The benchmark concentrations are not effluent limitations;a benchmark exceedance,therefore,is not a permit violation.When the discharge exceeds an applicable benchmark concentration,the permittee must conduct corrective actions consistent Part I.K(Corrective Actions)of this permit. Failure to respond to benchmark value exceedances is a violation of the permit. a. Applicability of Benchmark Monitoring The permittee shall monitor at each benchmark sampling location for each benchmark parameter(s)specified for the industrial activity in Part 1.0—Asphalt Batch Plants,and Part LP—Concrete Batch Plants of this permit.The Division may also include a site specific benchmark in a permit certification as appropriate to ensure that compliance with the other terms and conditions of the permit will control discharges as necessary to meet water quality based effluent limitations contained in Part I.C.2.b of the permit. b. Benchmark Monitoring Schedule Benchmark monitoring must be conducted quarterly,for the first 4 full quarters of permit coverage. Exceptions to this schedule include: i) Permittees at facilities in climates with irregular stormwater runoff may request a modification of this quarterly schedule as specified in Part I.H.5 of this permit. c. Averaging monitoring values Permittees must calculate average concentrations in accordance with the requirements of Part LEA of this permit. d. Benchmark Monitoring Actions—Data not exceeding benchmarks After collecting 4 benchmark samples,if the average of the monitoring values for any parameter,at a specific outfall,does not exceed the benchmark,the permittee may reduce benchmark monitoring frequency for that parameter to once-per- year, rotating through the quarterly monitoring periods. DMR reporting shall be consistent with Part I.N of this permit.