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D. SAMPLING AND ANALYTICAL PROCEDURES <br /> Samples and measurements taken to meet the requirements of this permit must represent <br /> the volume and nature of the monitored parameters, including representative sampling of <br /> any unusual discharge or discharge condition, including authorized bypasses, upsets, and <br /> maintenance-related conditions affecting effluent quality. <br /> Sampling and analytical methods used to meet the monitoring requirements specified in <br /> this permit must conform to the latest revision of the Guidelines Establishing Test <br /> Procedures for the Analysis of Pollutants12 contained in 40 CFR 13613 (or as applicable in 40 <br /> CFR subchapter N14 [Parts 400-471] or 40 CFR subchapter 015 [Parts 501-503]) unless <br /> otherwise specified in this permit. <br /> E. FLOW MEASUREMENT <br /> The Permittee must: <br /> 1. Select and use appropriate flow measurement and method consistent with <br /> accepted scientific practices. <br /> 2. Install, calibrate, and maintain these devices to ensure the accuracy of the <br /> measurements is consistent with the accepted industry standard, the <br /> manufacture's recommendation, and approved O&M manual procedures for the <br /> device and the wastestream. <br /> 3. Establish a calibration frequency for each device or instrument in the Permittee's <br /> O&M Manual that conforms to the frequency recommended by the <br /> manufacturer. <br /> 4. Maintain calibration records for at least three years. <br /> F. LABORATORY ACCREDITATION <br /> 1. The Permittee must ensure that all monitoring data required by Ecology for <br /> permit specified parameters is prepared by a laboratory registered or accredited <br /> under the provisions of chapter 173-50 WAC, Accreditation of Environmental <br /> Laboratories. Flow and internal process control parameters are exempt from this <br /> requirement. <br /> G. REQUEST FOR REDUCTION IN MONITORING <br /> 1. The Permittee may request a reduction of the sampling frequency after twelve <br /> (12) months of monitoring by demonstrating that the distribution of <br /> 12 https://www.ecfr.gov/cgi-bin/text- <br /> idx?SID=0e534d17f9783994a26ffee684d260c2&mc=true&node=pt40.25.136&rgn=div5 <br /> 13 https://www.ecfr.gov/cgi-bin/text- <br /> idx?SI D=0e534d 17f9783994a26ffee684d260c2&mc=true&nod e=pt40.25.136&rgn=div5 <br /> 14 https://www.ecfr.gov/cgi-bin/text- <br /> idx?SID=Oe534d17f9783994a26ffee684d260c2&mc=true&tpl=/ecfrbrowse/Title40/40ClsubchapN.tpl <br /> is https://www.ecfr.gov/cgi-bin/text- <br /> idx?SID=0e534d17f9783994a26ffee684d260c2&mc=true&tpl=/ecfrbrowse/Title40/40ClsubchapO.tpl <br /> Puget Sound Nutrient General Permit Page 41 <br />