2018-10-22_REVISION - M2008078 (12)

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PART Page 23 of 67 Permit No.:COG500000 Division to sample at these points. Except where specified,grab samples shall be used for all monitoring and shall not be combined. 3. Adverse Weather Conditions When adverse weather conditions prevent sample collection according to the relevant monitoring schedule,the permittee must take a substitute sample,as possible,during the remaining monitoring period;for stormwater,the permittee must take a substitute sample during the next qualifying storm event. Adverse conditions are those that are dangerous or create inaccessibility for personnel,such as local flooding, high winds,or electrical storms. Adverse weather does not exempt the permittee from having to file timely DMRs. The permittee must report any failure to monitor and indicate the basis for not sampling during the usual reporting period. 4. Analytical requirements The permittee shall install,calibrate,use and maintain monitoring methods and equipment,including biological and indicated pollutant monitoring methods.All sampling shall be performed by the permittee according to specified methods in 40 C.F.R. Part 136;methods approved by EPA pursuant to 40 C.F.R. Part 136;or methods approved by the division in the absence of a method specified in or approved pursuant to 40 C.F.R. Part 136. The permittee may use an equivalent and acceptable alternative to an EPA-approved method without EPA review where the requirements of 40 CFR Part 136.6 are met and documented.The permittee may use an Alternative Test Procedure(ATP).An ATP is defined as a way in which an analyte is identified and quantified that is reviewed and approved by EPA in accordance with 40 CFR Part 136.4 for nationwide use,or a modification to a 40 CFR 136 approved method that is reviewed and approved by EPA in accordance with 40 CFR Part 136.5 for limited use. a. The permittee must select a test procedure that is"sufficiently sensitive"for all monitoring conducted in accordance with this permit. b. The PQLs for specific parameters are listed in tables E.4-1, below. c. If the permit contains an interim effluent limitation(a limit is report until such time as a numeric effluent limit becomes effective)for a parameter,the final numeric effluent limit shall be considered the AWQC for the purpose of determining whether a test method is sufficiently sensitive. d. When the analytical method which complies with the above requirements has an ML greater than the permit limit,and the permittee's analytical result is less than the ML,the permittee shall report"BDL"on the DMR.Such reports will not be considered as violations of the permit limit,as long as the method is sufficiently sensitive. For parameters that have a report only limitation,and the permittee's analytical result is less than the ML,(where X=the ML)"<X"shall be reported on the DMR. e. In the calculation of average concentrations(i.e.7-day,30-day average,2-year rolling average)any individual analytical result that is less than the ML shall be considered to be zero for the calculation purposes.When reporting: • If all individual analytical results are less than the ML,the permittee shall report either"BDL"or"<X"(where X=the ML),following the guidance above. • If one or more individual results is greater than the ML,an average shall be calculated and reported. Note that it does not matter if the final calculated average is greater or less than the ML,it must be reported as a value.