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STANDARD PROVISION AND REPORTING REQUIREMENTS -8- Waste Discharge to Land e. The "daily maximum" Concentration is the highest measurement made on any single discrete sample or composite sample_ f. A "grab" sample is any sample collected in less than 15 minutes. g. Unless otherwise specified, a composite sample is a combination of individual samples collected over the specified sampling period; (1) at equal time intervals,with a maximum interval of one hour (2) at varying time intervals (average interval one hour or less) so that each sample represents an equal portion of the cumulative flow. The duration of the sampling period shall be specified in the Monitoring and Reporting Program. The method of compositing shall.be.reported with the results: 7. Annual Pretreatment_Report Requirements: _ --- Applies to dischargers required to have a Pretreatment Program as..stated-in_waste discharge requirements.) The annual report shall be submitted by 28 February and include, but not-be.limited to, the following items a. A summary of analytical results from representative, flow-proportioned, 24-hour composite sampling of the influent and effluent for those pollutants EPA has identified under Section 307(a) of the Clean Water Act which are known or suspected to be discharged by industrial users. The discharger.is not required to sample and analyze for asbestos until EPA promulgates an applicable analytical technique under 40 CFR (Code of for. Regulations) Part 1.36. Sludge shall be sampled during the same 24-hour period and analyzed for the same pollutants as the influent and effluent sampling analysis. The sludge.analyzed shall be a composite sample ofa minimum:of,.l Z discrete.samples taken at equal time intervals over the'24�-hour period. V1Wastevwater,and sludge sampling and analysis shall tieperformed at.least anniially: The discharger shall also provide any influent, effluent or sludge monitoring data for nonpriority,pollutants which may be causing or.contributing to lnterference; Pass Through or adversely,impacting sludge quality. -Sampling and analysis shall be performed in accordance with the techniques prescribed in 40 CFR-Part 136 and amendments thereto. b. A discussion of Upset, Interference, or.Pass Through incidents ifany,`at the treatment plant which therdischarger knows or suspects were caused by industrial use of the'system: The discussion shall include the reasons why the incidents occurred,the corrective actions taken and, if known, the name and address of the industrial user(s)responsible. The discussion shall also include a review of the applicable pollutant limitations to determine whether any