Chapter-III(59-80) - Pollution Control Board, Assam

EIA & RA STUDY FOR NAPHTHA SPLITTER PROJECT AT NUMALIGARH REFINERY LIMITEDBaseline Environmental StatusTable - 3.39PHYSICO-CHEMICAL CHARACTERISTICS OF SURFACE WATER SAMPLESPeriod : December 2007 to February 2008(Result are expressed in mg/l, unless otherwise stated)ANALYSIS RESULTSSl.No.PARAMETERSKalianiRiverDhansiriRiver(U/S)DhansiriRiver(D/S)DoirgrungRiverDesirable/PermissibleLimitIS: 10500PHYSICAL1 Temperature, O C 20.1 23.2 23.1 24.0 -2 pH 7.1 7.2 7.4 7.3 6.5-8.53 Colour, HU 3 2 2 2 5/254 Turbidity, NTU 10 15 15 15 5/105 Total dissolved solids 110 170 176 240 500/20006 Suspended Solids 12 10 15 15CHEMICAL1 Total Alkalinity as CaCO 3 46 90 84 140 200/6002 Total Hardness as CaCO 3 32 98 102 92 300/6003 Calcium Hardness as Ca 8 22 22 20 75/2004 Mag. Hardness as Mg 4 10 12 10 305 Chloride as Cl 8 4 6 16 250/10006 Sulphate as SO 4 50 36 40 35 200/4007 Nitrate as NO 3 1.1