2018-10-22_REVISION - M2008078 (12)

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PART Page 28 of 67 Permit No.:COG500000 This documentation is required only for those storm events that result in a discharge that the permittee monitors. b. Snowmelt monitoring: The permittee must document the date of the sampling event for each monitored snowmelt event. This documentation is required only for those snowmelt events that result in a discharge that the permittee monitors. 4. Sample Type and Requirements a. Grab samples shall be used for all monitoring and shall not be combined. b. Permittees must take a minimum of one grab sample from a discharge resulting from a measurable storm event. c. Grab samples must be collected within the first 30 minutes of a measurable storm event(see Part I.H.2). If it is not possible to collect the sample within the first 30 minutes of a measurable storm event,the sample must be collected as soon as practicable after the first 30 minutes,and documentation must be kept with the SWMP explaining why it was not possible to take samples within the first 30 minutes. d. In the case of snowmelt,samples must betaken during a period with a measurable discharge. e. All discharge samples at a facility must be taken during the same storm event,if feasible. 5. Climates with Irregular Stormwater Runoff a. If a facility is located in an area where limited rainfall occurs during parts of the year,or in areas where freezing conditions exist that prevent runoff from occurring for extended periods,the permittee may submit a modification request to the Division,to change the required monitoring events to seasons when precipitation occurs,or when snowmelt results in a measurable discharge from the facility. b. The permittee must still collect the required number of samples. c. The permittee must maintain the revised monitoring schedule with the facility's SWMP as specified in Part I.M.B. 6. Monitoring for allowable non-stormwater discharges A permittee is only required to monitor allowable non-stormwater discharges(as delineated in Part I.A.1.c)when they are commingled with stormwater discharges associated with industrial activity. 7. Monitoring Exceptions for Inactive and Unstaffed Sites The requirement that permittees conduct and document visual monitoring, benchmark sampling,or water quality standards monitoring of stormwater discharges does not apply at inactive and unstaffed sites(please see Appendix C-Definitions for how the term 'inactive'is used in this permit). Routine reporting of DMR data must follow the reporting conventions required at the Stormwater Specific Reporting and Recordkeeping section (Part I.N)of the permit. Additional requirements apply to these facilities,as provided below. a. At inactive and unstaffed facilities that maintain a condition of no exposure,i.e.,there are no industrial materials or activities exposed to stormwater: i. The permittee must maintain a statement in the facility SWMP(Part I.M.8)indicating that the site is inactive and unstaffed(and associated dates),and that there are no industrial materials or activities exposed to precipitation,in accordance with the substantive requirements in 5 CCR 1002-61.3(2)(h).The statement must be signed and certified in accordance with Part I.F(Reporting and Recordkeeping). ii. If conditions change and industrial materials or activities become exposed to stormwater,this exception no longer applies and instead,the exception at Part I.H.7.b, below,applies. b. At inactive and unstaffed facilities that do not maintain a condition of no exposure,the permittee must conduct additional facility inspections as required at Part 114 of this permit.