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NPDES Monitoring Requirement 10 September 2001 <br /> Attachment E-1 — Sampling Frequency and Number of <br /> Samples (Minor Industrial) <br /> Samples shall be collected from the effluent and upstream receiving water and analyzed <br /> for the constituents listed in Attachment II to provide the indicated number of valid <br /> sample results by the submittal due date. Sampling frequency shall be adjusted so that <br /> the appropriate number of samples is collected by the due date and so that the sampling is <br /> representative of the wastewater discharge. <br /> Constituent/Sample Frequency Timeframe Total <br /> Type' (years) Number of <br /> Samples <br /> Volatile Quarterly 1 4 <br /> Organics/grab <br /> Semi-Volatile Quarterly 1 4 <br /> Organics/grab or <br /> composite <br /> Inorganics/grab or Quarterly 1 4 <br /> composite <br /> Pesticides & Quarterly 1 4 <br /> PCBs/grab or <br /> composite <br /> Other Quarterly 1 4 <br /> Constituents3/grab <br /> or composite <br /> Discharge& Monthly 1 12 <br /> Receiving <br /> Water Flow <br /> Dioxins/grab or Semi-annual 1 2 <br /> composite <br /> t The effluent sampling station and the upstream receiving water station specified in the <br /> NPDES Permit Monitoring and Reporting Program should be used. <br /> 2 OP pesticides (diazinon, chlorpyrifos) are not required of industrial facilities. <br /> 3 See list in Attachment II. <br /> 4 Discharge and Receiving Water Flow. Discharge flow should be recorded and <br /> reported for each day of sample collection. All NPDES dischargers should have a <br /> means of measuring the volume of discharge as part of their monitoring already <br /> required by the NPDES Permit Monitoring and Reporting Program. Receiving Water <br /> Flow, however, is not generally required by NPDES Permit Monitoring Programs. <br /> For facilities that already conduct receiving water flow monitoring,the receiving <br /> water flow should be recorded and reported for each day in which sampling occurs. <br /> For facilities that do not routinely conduct receiving water flow monitoring,provide <br /> the best estimate of flow reasonably obtainable. It may be possible to obtain flow <br /> data from an existing�earby gauging station. <br /> loft <br />