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LABORATORY PROCEDURES 1. DISSOLVED OXYGEN: Direct readings on oxygen meter; galvanic cell device with thermistor sensor to provide temperature compensation, sensitivity _+ 18 of full scale, range 0-10 and 0-20 mg per liter. 2 . pH : Direct readings on pH meter; glass measuring electrode with calomel reference electrode; temperature compensa- tion 0 to 100°C; accuracy + 0 . 1 unit. 3 . BIOCHEMICAL OXYGEN DEMAND (5-day) : Iodometric Method , using the azide modification. Reference , Standard Methods for the Examinationof ater and Wastewater, 13th Edition, 1971, Oxygen Demand BiWochemical , p. 489 . 4 . TOTAL SUSPENDED AND VOLATILE MATTER: Gravimetric Method. Reference, Standard Methods for the Examination of Water and Wastewater, 13th Edition , 1971, pp. 537-538 . 5 . SETTLED VOLUME AND SLUDGE VOLUME INDEX: Reference , Standard Methods for the Examination of Water and Wastewater , 13th Edition, 1971 , pp. 560-561. 6 . ANE4ONIA NITROGEN: Direct Nesslerization Method . Reference , Standard Methods for the Examination of Water and Waste- water, 13th Edition, 1971, pp. 226-231. 7 . NITR:=TE NITROGEN: Brucine Method. Reference, Standard Methods for the Examination of Water and Wastewater , 13th Edition , 1971, p . 461 . P . CHEMICAL OXYGEN DEMAND : Dichromate Reflex Method. Reference , Standard Methods for the Examination of Water and Waste- water, lith Edition, 1971 , p. 495 . 9 . PHOSPHATE , TOTAL DISSOLVED AND SUSPENDED: Stannous Chloride Method, with Persulfate Digestion. Reference , Standard Methods for the Examination of Water and wastewater, 13th Edition, 1971 , pp. 525-532 . 10 . COLIFORM GROUP : Multiple Tube Fermentation Technique , Refer- ence , Standard Methods for the Examination of water and Wastewater, 13th Edition, 1971, pp . 664-676 . 11 . RESIDUAL CHLORINE: Iodometric Method. Reference , Standard Methods for the Examination of Water and Wastewater, 13th Edition, 1971, p. 11U . 10 40