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PART II <br />Page No. 7 <br />Permit No. COG-500000 <br />6. Effluent Limitations and Monitoring Requirements-Concrete and Hot Asphalt Batch Plants-means process wastewater generated <br />during the mixing process. This also includes the associated truck and drum wash area for concrete facilities, and the wet scrubber discharge <br />from hot asphalt plants. <br /> "'Limttations <br /> <br />Parameter <br />30-Day <br />7-Day <br />Daily <br />Rationale Monitoring <br />Ft? Moyitorin t Sample <br />Type <br /> T- <br /> General Permit Requirements <br />Flow, MGD Report NA Report Discharge Evaluation Continuous /2 Recorder / <br /> Instantaneous In-situ <br />pH. s.u. N/A NA 6.5-9.0 Water Quality Standards Weekly Grab <br />Oi:' _nd Grease, mg/1 N/A NA 10 State Effluent Regulations Weekly Visual 3 <br />Total Suspended Solids, mg/1 30 NA 45 State Effluent Regulations Weekly Grab <br /> Federal Effluent Limitation Guidelines <br />Total Iron, mg/l 1 NA 2 Federal ELG Weekly Grab <br />Site Specific Limitation <br />Total Dissolved Solids, mg/l • <br />Total Phosphorus (as P), mg/1 •• <br />Other Pollutants of Concern <br />Whole Effluent Toxicity (WET) <br />Chronic <br />Report NA Report <br />Report NA Various <br />Various NA Various <br />Stat Diff and IC25 _> IWC <br />LC50 > 100% <br />Salinity Regulations Quarterly ° <br />Control Regulations Monthly <br />Water Quality Standards Weekly <br />State Permit Limitations Quarterly <br />Grab <br />Grab <br />Grab <br />3 Grab/Test <br />Footnotes 1-4, * and ** can be found under Part I.B.I. <br />7. Compliance Schedules- If necessary, any compliance schedule items will be noted in the certification to discharge. <br />8. WET Testing <br />a. Acute WET Testing (See also Part I.B.7.c for WET requirements applicable to both chronic and acute WET testing) <br />1. Testing and Reporting Requirements <br />Tests shall be done at the frequency listed in Parts I.B.1 through I.B.6. Test results shall be reported along with the <br />Discharge Monitoring Report (DMR) submitted for the end of the reporting period when the sample was taken. (i.e., WET <br />testing results for the calendar quarter ending March 31 shall be reported with the DMR due April 28, etc.) The results shall <br />be submitted on the Acute Toxicity Test report form, available from the Division. Copies of these reports are to be <br />submitted to the Division along with the DMR. <br />The permittee shall conduct each acute WET test in general accordance with methods described in Methods for Measuring <br />the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms EPA/600/4-90/027 or its most <br />current edition, except as modified by the most current Division guidance document entitled Guidelines for Conducting <br />Whole Effluent Toxicity Tests. The permittee shall conduct an acute 48-hour WET test using Ceriodaphnia sp., and an acute <br />96-hour WET test using fathead minnows. Acute tests will be replacement static tests of a single effluent grab sample. <br />2. Failure of Test and Division Notification <br /> <br />An acute WET test is failed whenever the LC,, which represents an estimate of the effluent concentration which is lethal to <br />50% of the test organisms in the time period prescribed by the test, is found to be less than or equal to 100% effluent. The <br />permittee must provide written notification of the failure of a WET test to the Division, along with a statement as to whether <br />the Preliminary Toxicity Incident (PTI)/Toxicity Identification Evaluation (TIE) investigation or accelerated testing is being <br />performed. Notification must be received by the Division within 14 calendar days of the demonstration of acute WET <br />in the routine required test. Demonstration means no later than the last day of the laboratory test. <br />b. Chronic WET Testing (See also Part I.B.7.c for WET requirements applicable to both chronic and acute WET testing) <br />1. Testing and Reporting Requirements <br />Tests shall be done at the frequency listed in Parts I.B.1 through I.B.6. Test results shall be reported along with the <br />Discharge Monitoring Report (DMR) submitted for the reporting period during which the sample was taken. (i.e., WET