COMPLETINGDISCHARGEMONITORINGREPORTS.ppt

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COMPLETINGDISCHARGEMONITORINGREPORTS.ppt

Completing Discharge Monitoring Reports Subjects To Be Covered Definitions and formulas necessary to complete DMR A closer look at a preprinted DMRS An example DMR problem (step by step through the process of completing the DMR) Common errors MATERIALS NEEDED Laboratory reports/analytical data. Preprinted discharge monitoring report (DMR). Calendar. Calculator capable of performing Logarithmic functions. Flow data. Scratch paper. * NPDES ENFORCEMENT SECTION DAILY DISCHARGE MONTHLY AVERAGE 30-DAY AVERAGE 7-DAY AVERAGE LOADING (AVERAGE AND MAXIMUM) GEOMETRIC MEAN (FOR FECAL COLIFORM) DEFINITIONS AND FORMULAS MOST PERMITTEES DON’T TAKE MORE THAN ONE SAMPLE PER DAY. IF YOU ONLY COLLECT ONE GRAB SAMPLE PER DAY OR LESS, THE “DAILY DISCHARGE” DEFINITION MEANS THE ONE SAMPLE REPRESENTS THE DISCHARGE FOR THAT DAY. THIS IS THE DEFINITION OF MONTHLY AVERAGE CONCENTRATION. UNLIKE A “NORMAL” AVERAGE, MONTHLY AVERAGE CONCENTRATION IS A FLOW WEIGHTED AVERAGE. FORMULA BELOW [C1F1 + C2F2 + C3F3 +… CnFn] = Flow weighted average [F1+F2+F3+…Fn] Where C = sample concentration in mg/l F = flow on the day of sample Very few NPDES Permits still retain 30-day average limitations. Most have been replaced with monthly average. THE 30-DAY AVERAGE IS NOT FLOW WEIGHTED LIKE A MONTHLY AVERAGE. FORMULA BELOW [C1 + C2 + C3 +… Cn] = average n Where C = sample concentration in mg/l n = number of samples 7-day averages are not flow weighted The Saturday rule determines which month the 7-day average is reported See further explanation of Saturday rule on next two slides THE 7-DAY AVERAGE IS NOT FLOW WEIGHTED LIKE A MONTHLY AVERAGE. FORMULA IS SAME AS 30-DAY AVERAGE [C1 + C2 + C3 +… Cn] = average n Where C = sample concentration in mg/l n = number of samples 7-DAY AVERAGE Samples collected the last week of May will be used to calculate the monthly average in May, but the 7-Day Average of these samples will be

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