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c.. 11. CLARIFIER, TANK CONDITION: Look at interior surface of walls when clarifier is ` empty. Visually observe appearance of walls and record cleanliness according to the following code: C: Clean AVG: Average DTY: Dirty 12. CHLORINE CONTACT CHAMBER, LIQUID CLARIFY: Visually observe liquid in chlo- rine contact chamber. Record clarity according to the following code: `r C: Clear H: Hazy T: Turbid or Cloudy 13. CHLORINE CONTACT CHAMBER, RESIDUAL CHLORINE: Remove a well-mixed sample from chlorine contact chamber after liquor has been in contact with chlorine at least 30 minutes. Test this liquor sample as follows: a. Rinse a clean test tube with a small amount of the liquor being tested. b. Pour 5 ml of liquor into the test tube. c. Add 8 drops of chlorine reagent (Orthotolidine) to liquor sample. Cap test tube �- and shake it vigorously for 5 seconds. d. Let sample stand quietly for 3 minutes. At the end of the 3-minute period, insert test tube in residual chlorine comparator and visually compare color of test sample with colors of known standard values. e. Record numerical value of standard color which is closest to color of test sample. s.. if color of sample is darker than color of highest standard volume, report chlorine residual as that of the highest standard with a plus sign behind the number. INTERPRETATION OF RESULTS �. The numerical value attained in this test indicates the amount of excess chlorine remaining in the liquor sample, measured in parts per million (ppm). The required amount of residual chlorine is set by the regulatory agency. If residual chlorine value is below the set standard, the chlorine tablet holding tube should be lowered in the chlorinator and the test should be repeated in the next cycle. If residual chlorine value is more than 2.0 ppm above set standard, the chlorine table holding tube should be raised in the chlorinator and test should be repeated in the next cycle. The amount of chlorine required to achieve the desired amount of residual chlorine is dependent upon the amount of organic material and bacteria existing in the effluent. Local or state health authorities should be consulted concerning effluent quality control requirements at each installation. 14. CHLORINE CONTACT CHAMBER, pH TEST: Use a portion of the sample removed from chlorine contact chamber for step 13 above. Test this liquor sample as follows: a. Tear off a strip of test paper approximately one inch long from roll dispenser. b. Dip test strip of paper into the liquor sample. c. Visually observe color of wetted test strip in comparison with color chart on side of dispenser. d. Record pH value of standard color closest to color of wet test strip. NOTE: The above test is generally adequate for remote installations. If more exact methods are required, consult your local sanitation agency. 6