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5. AERATION TANK, ODOR: Smell odor in aeration chamber and record approximate odor according to the following code: S: Septic (sour, objectionable) D: Dishwater G: Grease or Lard N: No odor 6. AERATION CHAMBER, FOAM: Measure approximate depth of foam above surface level of the liquid. Record measurement to closest inch. 7. AERATION CHAMBER, PERCENT SOLIDS: Use sample removed from aeration chamber in step 4 above. Pour liquid into a graduated cylinder marked on the outside with a linear scale from 0-1000. Fill container to 1000 mark and let sample stand quietly for 30 minutes. At end of 30-minute settling period, read level of settled sludge from scale on side of cylinder and record this number on the report form. Record level after 60 minutes as well. Also, indicate approximate density of settled sludge using a suffix, after the number, according to the following code: TK: Thick TN: Thin �. INTERPRETATION OF RESULTS a. Reading of 30-50% indicates a satisfactory condition. �. b. Reading of more than 50% indicates that sludge is not receiving adequate aera- tion. In this case, increase standby operating time for the aeration pump or open air supply line throttles a small amount. It may also be necessary for aeration supplementation by the mixed liquor overflow under continuous operation as previously mentioned. Repeat the percent solids test after 24 and 48 hours. If percent solids remain high, it may be necessary to waste sludge. �- c. Reading of less than 30% indicates excess aeration. In this case, decrease standby aeration time or close air supply line throttles a small amount. Never decrease standby aeration to less than 3 minutes out of every 15-minute period. w.. This will ensure enough mixing in the aeration chamber. 8, AERATION CHAMBER, LIQUID CLARITY: Visually observe supernatant liquid above the level of settled sludge when sludge depth is observed in step 7 above. This will ensure enough mixing in the aeration chamber. C: Clear M: Moderate T: Turbid or Cloudy &- 9. AERATION CHAMBER, LIQUID DEPTH: Measure distance from surface level of liquid (excluding foam) to top of hatch opening. Record distance in inches. This v measurement should be taken at the same time the sample is taken for percent �- solids in step 7 above. The liquid depth can be helpful in interpreting variations in percent solids test results. Concentration of solids will tend to be greater as the liquid level becomes lower or at the end of the sludge return cycle. 10. CLARIFIER, FLOATING SOLIDS: If a batch of sewage is being processed through the clarifier, there will be water in the chamber. Visually observe surface level of liquid. Record observations concerning amount of floating solids with the following code: N: NONE FEW: Few MOD: Moderate HVY. Heavy L 5