(A) All categorical and significant industrial users shall monitor for wastewater constituents on a monthly basis as may be specified by the Public Works Director or required under applicable state law, federal pretreatment standards, or federal regulations. Categorical users shall monitor for all federal limited parameters at least twice a year and for all Clean Water Act priority pollutants at least once per year. Wastewater flow measurements and samples shall be collected and analyzed in a state certified laboratory. The laboratory results shall be submitted with the monthly report in the month they are received. Laboratory analysis and associated sampling costs will be paid for by the user.
(B) Samples and measurements taken for the purpose of monitoring shall be representative of the monitored activity. Samples should be taken immediately downstream from pretreatment facilities if such exist or immediately downstream from the process if no pretreatment exists. If other wastewaters are mixed with the regulated wastewater prior to pretreatment, the user should measure the flows and concentrations necessary to allow use of the combined wastestream formula of § 52.048 in order to evaluate compliance with the pretreatment standards. Where an alternate concentration or mass limit has been calculated in accordance with § 52.048, this adjusted limit along with the supporting data shall be submitted to the Public Works Director.
(C) The user shall retain records of all monitoring information, including all calibration and maintenance records and all original ship chart recordings for continuous monitoring instrumentation, copies of all reports required by the permit, and records of all data used to complete the application for the permit, for a period of at least three years from the date of the sample, measurement, report or application. This period may be extended by request of the Public Works Director (for example, during unresolved litigation).
(D) Records of monitoring information shall include:
(1) The date, exact place, and time of sampling or measurements;
(2) The individual(s) who performed the sampling or measurements;
(3) The date(s) analyses were performed;
(4) The individual(s) who performed the analyses;
(5) The analytical techniques or methods used; and
(6) The results of such analyses.
(E) Monitoring must be conducted according to test procedures approved under 40 C.F.R., part 136, unless other test procedures have been specified in the permit.
(F) A grab sample must be used for pH, cyanide, total phenols, oil and grease, sulfide, and volatile organics unless otherwise specified in the permit. For all other pollutants, 24-hour composite samples must be obtained through flow proportional composite sampling techniques where feasible. As specified in the user's permit, the Public Works Director may permit 24-hour time composite sampling where flow proportioned composite sampling for any user that demonstrates flow proportional sampling is infeasible.
(G) All samples shall be analyzed in conformance with A.R.S. § 36-495 environmental laboratories requirements.
(H) A categorical or significant industrial user who independently monitors any pollutant more frequently than as conducted by the town and required and specified by the Public Works Director, shall include the results of this monitoring in the required reports due in June and December.
(I) If sampling performed by categorical and significant industrial users indicates a violation, the user shall notify the Public Works Director within 24 hours of becoming aware of the violation. The user shall also repeat the sampling and analysis and submit the results of the repeat analysis to the Public Works Director within 30 days after becoming aware of the violation unless the town performs sampling at the user between the time when the user performs its initial sampling and the time when the user receives the results of this sampling.
(Ord. 09-03, passed 2-10-2009)