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STANDARD PROVISIONS AND REPORTING REQUIREMENTS -9- <br /> Waste Discharge to Land <br /> E. Dischargers Exempt from Subchapter 15 (continued) <br /> c. The monthly average concentration is the arithmetic mean of <br /> measurements made during the month. <br /> d. The "daily maximum" discharge is the total discharge by volume <br /> during any day. <br /> e. The "daily maximum" concentration is the highest measurement made <br /> on any single discrete sample or composite sample. <br /> f. A "grab" sample is .any sample collected in less than 15 minutes. <br /> g. Unless otherwise specified, a composite sample is a combination of <br /> individual samples collected over the specified sampling period; <br /> (1) at equal time intervals, with a maximum interval of one hour <br /> (2) at varying time intervals (average interval one hour or less) <br /> so that each sample represents an equal portion of the <br /> cumulative flow. <br /> The duration of the sampling period shall be specified in the <br /> Monitoring and Reporting Program. The method of compositing shall be <br /> reported with the results. <br /> 7. Annual Pretreatment Report Requirements: <br /> Applies to dischargers required to have a Pretreatment Program as <br /> stated in waste discharge requirements.) <br /> The annual report shall be submitted by 28 February and include, but <br /> not be limited to, the following items: <br /> a. A summary of analytical results from representative, flow- <br /> proportioned, 24-hour composite sampling of the influent and <br /> effluent for those pollutants EPA has identified under Section <br /> 307(x) of the Clean Water Act which are known or suspected to be <br /> discharged by industrial users. <br /> The discharger is not required to sample and analyze for asbestos <br /> until EPA promulgates an applicable analytical technique under 40 <br /> CFR (Code of Federal Regulations) Part 136. Sludge shall be <br /> sampled" during the same 24-hour period and analyzed for the same <br /> pollutants as the influent and effluent sampling and analysis. The <br /> sludge analyzed shall be a composite sample of a minimum of 12 dis- <br /> crete samples taken at equal time intervals over the 24-hour <br /> period. Wastewater and sludge sampling and analysis shall be <br />