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Pretreatment Industrial Users <br />General Permit Conditions Page <br />4 of 14 <br />Control Board's Division of Drinking Water Environmental Laboratory Accreditation <br />Program (FLAP) for the specific analysis conducted. <br />Acceptable methods for the analysis of wastewater required in the Wastewater <br />Discharge Permit Self -Monitoring Sample Program shall be limited to those listed <br />in 40 CFR Part 136. Permittee shall insure that all handling, preservation, and <br />laboratory analysis of collected samples is performed in accordance with 40 CFR <br />Part 136 and amendments thereto, unless otherwise specified in the monitoring <br />conditions of this permit. <br />Collection times for self -monitored composite and grab samples shall be <br />determined by Environmental Control staff on a case-by-case basis. The <br />composite and grab samples shall not be collected prior to the designated <br />collection time. <br />All samples collected (grab and composite) shall be thoroughly mixed and <br />representative of the volume and nature of the discharge for the sampling and <br />reporting period. <br />k. Samples from batch discharges shall be collected from a dedicated final effluent <br />batch holding tank which shall be the last connection through which process <br />wastewater can be discharged into the sanitary sewer system. Contents of the <br />batch holding tank shall be thoroughly mixed and shall provide a sample which is <br />representative of the volume and nature of the discharge for the sampling and <br />reporting period. <br />All sampling chain -of -custody forms must be completed as specified in the City of <br />Stockton Quality Assurance Manual for Self -Monitored Industries (included with <br />this permit) and, at a minimum, shall include: <br />1. <br />Clearly identified sample source location identification (including <br />any QC designation). <br />2. <br />Precise dates and times of sample collection. <br />3. <br />Sample type: composite or grab. <br />4. <br />Start and stop times of composite samples. <br />5. <br />Sample container composition: glass, plastic, etc. <br />6, <br />Number of sample containers. <br />7. <br />Sample preservation methods, including temperature. <br />8. <br />Tests performed and corresponding specific analytical methods <br />(EPA, Standard Methods, etc.). <br />9. <br />Proper chain of custody signatures, dates and times. <br />M Sampling frequency and reporting will be determined on a case-by-case basis, but <br />must at least comply with 40 CFR 403.12 (g) "Monitoring and Analysis to <br />Demonstrate Continued Compliance" and any specific federal, state and tocai <br />requirements. <br />