2017-02-03_PERMIT FILE - C1980004 (13)

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PART I Page 25 of 48 Permit No.: C00038342 points. Unless specifically exempted, or modified in the EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS section, a flow measuring device will be applicable at all designated discharge points. At the request of the Division, the permittee shall show proof of the accuracy of any flow -measuring device used in obtaining data submitted in the monitoring report. The flow -measuring device must indicate values within ten (10) percent of the actual flow being measured. 4. Extra Monitoring If the permittee, using an approved analytical method, monitors any parameter more frequently than required by this permit, then the results of such monitoring shall be included in the calculation and reporting of the values required in the Discharge Monitoring Report Form (DMRs) or other forms as required by the Division. Such increased frequency shall also be indicated. 5. 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, winter weather, or electrical storms. Adverse weather does not exempt the permittee from having to file timely DMRs. The permittee must report any failure to monitor, including the basis for not sampling during the usual reporting period. Evidence to support this basis may include the dates that monitoring attempts were made; photographs; field notes and official weather data from a scientifically recognized organization, such as NOAA or the NWS, that establish site inaccessibility, etc. 6. Additional Stormwater-specific provisions (Outfall 010) a. Measurable Storm Events i. Rain event. The permittee must conduct all required monitoring on a storm event that results in an actual discharge from the facility ("measurable storm event"), and that follows the preceding measurable storm event by at least 72 hours (3 days), except as provided in b., below. ii. Snowmelt event. The permittee must conduct snowmelt monitoring at a time when a measurable discharge occurs from the facility, except as provided in b., below. b. Detained stormwater In the event stormwater is detained at the facility, such as in a detention pond/area, the permittee must conduct all required monitoring on discharges from such detention areas, whether the discharge results from a rain or snowmelt event or from the manual release of accumulated stormwater from the detention area. c. Storm Event Information i. Rain event. The permittee must document the information below for each monitored event. Such documentation is not required for events that do not meet the measureable storm event criteria above, or that are not monitored to meet the requirements of this permit. a) The date, time of the start of the discharge, time of sampling, duration (in hours) of the rainfall event, and magnitude (in inches) of the storm event sampled; b) The duration between the storm event sampled and the end of the most recent storm event that produced a discharge. ii. Snowmelt monitoring. The permittee must document the date of the sampling event for each monitored snowmelt event.