2012-05-31_PERMIT FILE - M2009093

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ii. The duration between the storm event sampled and the end of the most recent storm event that produced a discharge. • Snowmelt monitoring. The permittee must document the date of the sampling event for each monitored snowmelt event. Sample Type and Requirements • Grab samples shall be used for all monitoring and shall not be combined. • Permittees must take a minimum of one grab sample from a discharge resulting from a measurable storm event. If the permittee, using an approved analytical method, monitors any parameter more frequently than specified in the Monitoring Requirements table above, 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). • Grab samples must be collected within the first 30 minutes of a measurable storm event. 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. • In the case of snowmelt, samples must be taken during a period with a measurable discharge. • All discharge samples at a facility must be taken during the same storm event, if feasible. Holding ponds: • Sampling from facility holding ponds or other impoundments must be performed at the outlet from the pond. If the pond does not discharge, no sampling is necessary. • If any process water mixes with stormwater, the resulting mixture is all considered process water, and must be covered under a CDPS industrial wastewater discharge permit. Certification Issued 5/31/2012 This certification under the permit requires that specific actions be performed at designated times. The certification holder is legally obligated to comply with all terms and conditions of the permit. Signed, 4 %,.. 7 e6toi.L-- Andrew Neuhart Assessment Based Permits Unit Manager Water Quality Control Division Effective: 5/31/2012 Certification Expires: 9/30/2012 (S &G)