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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 values <br />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 the <br />first 30 minutes, and documentation must be kept with the SWMP explaining why it was not possible to take samples within <br />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 under <br />a CDPS industrial wastewater discharge permit. <br />Parameter Benchmark values: The permittee must analyze stormwater samples for the parameters identified in this certification. <br />Benchmark values for these parameters are also provided in the certification, and are intended to be used to assess the <br />effectiveness of control measures implemented at the facility. A benchmark exceedance is not a permit violation and, unless <br />directed by the Division, the permittee is not required to take specific corrective action if a sample result exceeds its respective <br />benchmark value. <br />Certification issued 10/24/2013 Effective: 10/24/2013 Expiration Date: 9/30/2012 <br />*ADMINISTRATIVELY CONTINUED <br />This certification under the permit requires that specific actions be performed at designated times. The certification holder is <br />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 <br />*explanation of Admin Continued in cover letter <br />