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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 />