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' NPDES Monitoring Requirent 400 September 2001 <br /> Attachment I — Sampling Frequency and Number of Samples <br /> (Minor Industrial) <br /> Samples shall be collected from the effluent and upstream receiving water and analyzed <br /> for the constituents listed in Attachment ll 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 /> T-Semi-Volatile Quarterly 1 <br /> Organics/grab or <br /> composite 4 <br /> Inorganics/grab or Quarterly 1 <br /> composite 4 <br /> Testicides2 & Quarterly l <br /> PCBs/grab or <br /> -composite 4 <br /> Other Quarterly 1 <br /> Constituents 3/grab <br /> or composite 12 <br /> Discharge & Monthly 1 <br /> Receiving <br /> Water Flow° 2 <br /> Dioxins/grab or Semi-annual 1 <br /> composite <br /> 1 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 H. <br /> 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 nearby gauging station. <br /> I of 1 <br />