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ii. The duration between the storm event sampled and the end of the most recent storm event that produced a <br />discharge. <br />Snowmelt monitoring. The permittee must document the date of the sampling event for each monitored snowmelt event. <br />Sample Type and Requirements <br />Grab samples shall be used for all monitoring and shall not be combined. <br />Permittees must take a minimum of one grab sample from a discharge resulting from a measurable storm event. If the <br />permittee, using an approved analytical method, monitors any parameter more frequently than specified in the Monitoring <br />Requirements table above, then the results of such monitoring shall be included in the calculation and reporting of the <br />values required in the Discharge Monitoring Report Form (DMRs). <br />Grab samples must be collected within the first 30 minutes of a measurable storm event. If it is not possible to collect the <br />sample within the first 30 minutes of a measurable storm event, the sample must be collected as soon as practicable after <br />the first 30 minutes, and documentation must be kept with the SWMP explaining why it was not possible to take samples <br />within the first 30 minutes. <br />In the case of Snowmelt, samples must be taken during a period with a measurable discharge. <br />All discharge samples at a facility must be taken during the same storm event, if feasible. <br />Holding ponds: <br />Sampling from facility holding ponds or other impoundments must be performed at the outlet from the pond. if the pond <br />does not discharge, no sampling is necessary. <br />If any process water mixes with stormwater, the resulting mixture is all considered process water, and must be covered <br />under a CDPS industrial wastewater discharge permit. <br />Parameter Benchmark values: The permittee must analyze stormwater samples for the parameters identified in this <br />certification. Benchmark values for these parameters are also provided in the certification, and are intended to be used to <br />assess the effectiveness of control measures implemented at the facility. A benchmark exceedance is not a permit violation <br />and, unless directed by the Division, the permittee is not required to take specific corrective action if a sample result exceeds its <br />respective benchmark value. <br />Certification Issued 5/14/2013 Effective: 5/14/2013 Certification Expires: 9/30/2012 <br />Administratively continued <br />This certification under the permit requires that specific actions be performed at designated times. The <br />certification holder is legally obligated to comply with all terms and conditions of the permit. <br />Signed, <br />Kenan Diker <br />Work Group Leader <br />Assessment Based Permits <br />Water Quality Control Division