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-2- <br /> a. The combined thickness of sludge and scum exceeds one-third of the tank depth <br /> of the first compartment; or, <br /> b. The scum layer is within three inches of the outlet device; or, <br /> C. The sludge layer is within eight inches of the outlet device. <br /> In lieu of septic tank measuring, the septic tank may be pumped annually. <br /> Activated Sludge Systems Monitoring <br /> Influent Monitoring <br /> Monitoring of Activated Sludge System influent shall consist of the following: <br /> Type of <br /> Paramete Units Sample Sampling Frequency <br /> Daily Flow Gals/day -- Daily <br /> 20°C BOD5 mg/I 24-hr composite Monthly <br /> Total Suspended Solids mg/I 24-hr composite Monthly <br /> • Effluent Monitoring <br /> Monitoring of Activated Sludge systems' effluent shall consist of the following: <br /> Type of <br /> Parameter Units Sample Sampling Frequency <br /> 20°C BODS mg/I 24-hr composite Weekly' <br /> Total Suspended Solids mg/I 24-hr composite Weekly' <br /> Nitrate as NO3-N mg/I Grab Weekly' <br /> Total Nitrogen mg/I Grab Weekly' <br /> Total Coliform MPN/ Grab Weekly' <br /> 100 ml <br /> Effluent sampling shall be conducted concurrently with influent monitoring. The total <br /> average daily flow shall be calculated on a monthly basis. Time of collection of grab <br /> samples shall be recorded. <br /> If the discharge is intermittent rather than continuous, then on the first day of each such <br /> intermittent discharge, the discharger shall monitor and record data for all of the <br /> parameters listed above, after which the frequencies of analysis given in the schedules <br /> shall apply for the duration of each such intermittent discharge. In no event shall the <br /> discharger be required to monitor and record data more often than twice the <br /> frequencies listed in the schedules. <br />