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5.10 Analytical Requirements All pollutant analyses, including sampling techniques, to be submitted as part of a wastewater discharge permit application or report shall be performed by a laboratory certified by the state to perform the wastewater analyses in accordance with the techniques prescribed in 40 CFR Part 136, unless otherwise specified in an applicable categorical pretreatment standard, or unless otherwise pertormed in accordance with procedures approved by EPA or WSACC. eei 4i Pied wastewate be Fatary If 40 CFR Part 136 does not contain sampling or analytical techniques for the pollutant in question, sampling and analyses must be performed in accordance with procedures approved by EPA and WSACC. Analyses must be performed by a State certified lab for each parameter analyzed, if such certification exists for that prraincter. 5.11 Grab and Composite Sample Collection (a) All wastewater samples roust be representative of (lie user's discharge. Wastewater monitoring and flow measurement facilities shall be properly operated, kept clean, and maintained in good working order at all tunes. The failure of a user to keep its monitoring facility in good working order shall not be grounds for the user to claim that sample results are unrepresentative of its discharge. (b) Grab samples must be used for pH, cyanide, total phenols, oil and grease, sulfide, volatile organic compounds, and any other pollutants as required by 40 CFR 136. The POTW shall determine the number of grabs necessary to be representative of the User's discharge. See 40 CFR 403.12(g)(5) for additional grab sample number requirements for BMR and 90 Day Compliance Reports. Additionally, the Executive Director may allow collection of multiple grabs during a 24 hour period which are composited prior to analysis as allowed under 40 CFR 136. (c } Composite samples: All wastewater composite samples shall be collected with a minimum of hourly aliquots or grabs for each hour that there is a discharge. All wastewater composite samples shall be collected using flow proportional composite collection techniques, unless time - proportional composite sampling or grab sampling is authorized by the Executive Director. When authorizing time- proportional composites or grabs, the samples must be representative and the decision to allow the alternative sampling must be documented. 5.12 Timing Written reports will be deemed to have been submitted on the date postmarked. For reports which are not mailed, postage prepaid, into a mail facility serviced by the United States Postal Service, the date of receipt of the report shall govern. 5.13 Record Keening Users subject to the reporting requirements of this ordinance shall retain, and make available for inspection and copying, all records of information obtained pursuant to any monitoring activities required by this ordinance and any additional records of information obtained pursuant to monitoring activities undertaken by the user independent of such requirements. Records of self-monitoring activities required by this ordinance, wastewater discharge permit and/or other documents issued by or entered into with WSACC, shall include the date, exact place, method, and time of sampling, and the name of the person(s) taking the samples; the dates of analyses were perfori - ned; who performed the analyses; the analytical techniques or methods used; and the results of such analyses. These records shall remain available for a period of at least three (3) years. This period shall be automatically extended for the duration of any litigation concerning the user's discharge to the POTW unless otherwise ordered by the court in which litigation is pending, or where the user has been specifically notified of a longer retention period by the Executive Director. W+ Attachment number 7 H -3 Page 297