ORISSA MINING CORPORATION LIMITED BANGUR CHROMITE MINING PROJECT POST CLEARANCE ENVIRONMENTAL MONITORING REPORT FOR THE MONTH OF JULY 2011 MECON LIMITED RANCHI 834 002, INDIA 11.S2.2011 SEPTEMBER, 2011
ORISSA MINING CORPORATION LIMITED BANGUR CHROMITE MINING PROJECT POST CLEARANCE ENVIRONMENTAL MONITORING REPORT FOR THE MONTH OF JULY 2011 MECON LIMITED RANCHI 834 002, INDIA
CONTENTS Description Page 1 Introduction 1-6 2 Monitoring Description 1-6 3 Methodology 2-6 4 Results & Discussion 2-6 2011 MECON Limited, All right reserved
1.0 INTRODUCTION As a requirement of post clearance environmental monitoring for their different mine leases in the districts of Jajpur, Keonjhar and Sundergarh, Orissa Mining Corporation Limited (OMCL), a Government of Orissa undertaking has commissioned MECON Limited, a Public Sector Undertaking under the Ministry of Steel, Govt. of India, for regular post clearance environmental monitoring vide Agreement 2155/OMC/F & E/11 dated 01.02.2011. It has been planned to carry out environmental monitoring for air, water, noise and soil quality at specified locations and frequencies on monthly basis for twelve months in a year. 2.0 MONITORING DESCRIPTION In order to get an idea about the existing state of the environment, various environmental attributes such as meteorology, air quality, water quality, soil quality and noise level are being studied/monitored. The present report covers environmental data generated for the month of July 2011 in respect of surface/drinking/effluent water quality and ambient/work zone noise levels for Bangur mines in Keonjhar district of Orissa. Air monitoring was not done in this month. Monitoring stations are marked in Drg. MEC/Q6V4/11/S2/RPCMont/Bangur. Sampling and analysis was carried out by Environmental Engineering Laboratory of MECON, Ranchi. 2.1 Water Quality In order to assess existing water quality grab samples were collected from four locations comprising surface water, drinking water and effluent. Locations of water samples are given in Table 1. Table 1: Water Sampling Locations Location Sample Code Type 1 Surface water from Mahra Nalla Q6V4/BGR/SW/1 Surface water 2 Surface water from Andhari Nalla Q6V4/BGR/SW/2 Surface water 3 Drinking Water from Bangur Village Q6V4/BGR/DW/1 Drinking water 4 U/G Mine Discharge Q6V4/BGR/E/1 Effluent Water 2011 MECON Limited, All right reserved Page 1 of 6
2.2 Noise Level Noise monitoring was carried out at one ambient location. In addition to this, work zone noise monitoring was also carried out at one location. Noise monitoring stations are shown in Table-2 & 3. Table 2: Ambient Noise Monitoring Locations Station Location Zone Distance & Direction Code from mine N1 OMC Township Buffer Zone 2.3 Km SSW Table 3: Work Zone Noise Monitoring Locations Station Code Location Zone WN1 Near Mine Incline -1 Work Zone 3.0 METHODOLOGY Water Monitoring Surface water streams available in the vicinity of the mine lease, under ground mine water discharge/effluent water and drinking water were monitored. Grab samples were collected from the locations indicated in Table 1 and analysed for required parameters. Collection of samples and analyses were carried out following Standard Methods as per APHA hand book. Noise Monitoring Noise monitoring was carried out at the locations indicated in Table 2 & Table 3. Noise levels were measured at hourly intervals for 24 hours in case of ambient noise whereas measurements were carried out for 8 hours at work zone locations. Readings were taken by keeping the sound level meter ON for fifteen (15) minutes for each reading. 4.0 RESULTS AND DISCUSSIONS 4.1 Water Quality Monitoring The results of surface water are given in Table 4. The results have been compared with the CPCB norms as depicted in Table 5. From the results 2011 MECON Limited, All right reserved Page 2 of 6
it may be seen that water from these sources can be used for drinking purposes after conventional treatment and disinfection. Table 4: Results of Surface Water Analysis Parameters Surface water from Mahra Nalla Q6V4/BGR/SW/1 Surface water from Andhari Nalla Q6V4/BGR/SW/2 Date of Sampling 25.07.11 25.07.11 1. ph Value 7.5 7.2 2. Dissolved Oxygen (as O 2 ), mg/l 5.4 5.6 3. BOD, 3 days at 27 C, mg/l 2 2 4. Iron (as Fe), mg/l, Max. 0.52 0.45 5. Chromium (as Cr 6 + ), mg/l, Max. <0.01 <0.01 6. Coliform Organisms, MPN/100ml 400 500 Table 5: Water Quality Criteria as per Central Pollution Control Board Parameters Class A Class B Class C Class D Class E 1 ph 6.5 8.5 6.5 8.5 6.0-9.0 6.5 8.5 6.5 8.5 2 Dissolved oxygen (as O2), mg/l, min 6 5 4 4-3 BOD, 3 days at 27 C, max 2 3 3 - - 4 Total coliform organism, MPN/100 ml, max 50 500 5000 - - 5 Free ammonia (as N), mg/l, max - - - 1.2-6 Electrical conductivity, mmhos/cm, max - - - - 2250 7 Sodium absorption ratio, max. - - - - 26 8 Boron (as B), mg/l, max. - - - - 2 Class A: Drinking water source without conventional treatment but after disinfection Class B: Outdoor bathing (organized) Class C: Drinking water source after conventional treatment and after disinfection Class D: Propagation of Wild life and Fisheries Class E: Irrigation, Industrial Cooling, and Controlled Waste Disposal Class F: Not meeting A, B, C, D & E Criteria 2011 MECON Limited, All right reserved Page 3 of 6
The results of analysis of drinking water are given in Table 6. The results have been compared with the drinking Water Quality standards specified in IS 10500. From the results it is obvious that all the parameters meet the prescribed norms except iron, which is exceeding the norm marginally. Table 6: Results of Drinking Water Analysis Parameters Norms Drinking Water from Requirement (desirable limits) Permissible limits in absence of alternate source Bangur Village Q6V4/BGR/DW/1 Date of sampling 25.07.11 Essential Characteristics 1 Colour, Hazen Units. 5 25 <5 2 Odour Unobjectionable - Unobjectionable 3 Taste Agreeable - Agreeable 4 Turbidity, NTU, Max. 5 10 <5 5 ph value 6.5 to 8.5 No Relaxation 6.5 6 Total Hardness(as CaCO 3), mg/l, max 300 600 172 7 Iron (as Fe), mg/l, max. 0.3 1 1.26 8 Chloride (as Cl),mg/l, max. 250 1000 28 9 Fluoride (as F), mg/l, max. 1 1.5 0.28 Desirable Characteristics 10 Total Dissolved Solids, mg/l, max. 500 2000 518 11 Calcium (as Ca), mg/l, max. 75 200 16 12 Magnesium(as Mg), mg/l, max. 30 100 42 13 Copper(as Cu), mg/l, max. 0.05 1.5 <0.01 14 Manganese (as Mn), mg/l, max. 0.1 0.3 0.22 15 Sulphate (as SO 4), mg/l, max. 200 400 38 16 Nitrate (as NO 3), mg/l, max. 45 100-17 Phenolic compounds(as C 6H 5OH), mg/l, max. 0.001 0.002 <0.001 18 Mercury,(as Hg), mg/l, max. 0.001 No relaxation <0.0005 19 Cadmium (as Cd), mg/l, max. 0.01 No relaxation <0.005 20 Selenium (as Se ), mg/l, max. 0.01 No relaxation <0.005 21 Arsenic ( as As), mg/l, max. 0.05 No relaxation <0.03 22 Cyanide (as CN), mg/l, max. 0.05 No relaxation <0.01 23 Lead (as Pb), mg/l, max. 0.05 No relaxation <0.05 24 Zinc (as Zn ), mg/l, max. 5 15 0.12 25 Chromium (as Cr 6 + ), mg/l, Max. 0.05 No relaxation <0.01 26 Alkalinity( as CaCO 3), mg/l 200 600 268 27 Aluminium (as Al ), mg/l 0.03 0.2 <0.01 28 Boron (as B), mg/l, max. 1 5 <0.01 * Drinking Water Specification, IS : 10500 (1991) & Amendment no.1, January 1993 The results of analysis of effluent mine water discharge are given in Table 7. The results have been compared with the General Standards for discharge of environmental pollutants to Inland Surface water as prescribed by MoEF vide notification dated 19 th May 1993 and amendment in December 1993. From the results it is obvious that all the parameters meet the prescribed norms 2011 MECON Limited, All right reserved Page 4 of 6
Table-7: Results of Effluent Water Analysis Characteristics Norms U/G Mine discharge Q6V4/BGR/E/1 Date of Sampling 25.07.11 1 Colour, Hazen 5 <5 2 Odour Unobjectionable Unobjectionable 3 Suspended Solids, mg/l 100 32 4 Particle Size of Suspended Solids Shall pass through 850 micron 100 % Passed sieve 5 ph 5.5-9.0 7.4 6 Temperature, O C Shall not exceed 5 C above 28 receiving water temperature 7 Oil & Grease, mg/l 10 <0.1 8 Ammonical nitrogen (as N), mg/l, Max 50 0.24 9 Total Kjeldahl nitrogen (as N), mg/l, 100 1.36 10 Free ammonia (as NH3), mg/l 5 <0.01 11 Biochemical oxygen demand (3 days at 27ºC), mg/l 30 2 12 Chemical Oxygen demand, mg/l 250 28 13 Arsenic (as As), mg/l 0.2 <0.01 14 Mercury (as Hg), mg/l 0.01 <0.005 15 Lead (as Pb), mg/l 0.1 <0.05 16 Cadmium (as Cd), mg/l 2 <0.005 17 Hexavalent chromium (as Cr+6), mg/l, Max 0.1 <0.01 18 Total chromium (as Cr), mg/l 2 <0.05 19 Copper (as Cu), mg/l 3 <0.01 20 Zinc (as Zn), mg/l 5 0.025 21 Selenium (as Sc.), mg/l 0.05 <0.005 22 Nickel (as Ni), mg/l 3 <0.01 23 Cyanide (as CN), mg/l 0.2 <0.01 24 Fluoride (as F), mg/l 2 0.29 25 Dissolved phosphates (as P), mg/l, 5 0.16 26 Sulphide (as S), mg/l 2 <1.0 27 Phenolic compounds (as CyH5OH), mg/l 1 <0.001 28 Manganese (as Mn), mg/l 2 <0.001 29 Iron (as Fe), mg/l 3 0.36 30 Vanadium (as V), mg/l 0.2 <0.2 31 Nitrate Nitrogen, mg/l 10-4.2 Noise Monitoring Summarised results of ambient noise monitoring are given in Table 8. The results have been compared with the standard specified in Schedule III, Rule 3 of Environmental Protection Rules given in Table 9. Stn. Table 8: Summarised Results of Noise Monitoring () Location Results Day (0600-2200 hr.) Night (2200-0600 hr.) Min. Max. Mean.* Min. Max. Mean.* N1 Bangur Village 46.6 55.2 52.3 42.9 50.4 46.4 * Logarithmic Averages. All Values in db (A). 2011 MECON Limited, All right reserved Page 5 of 6
Table 9: CPCB Norms in respect of Ambient Noise Type of Area Industrial Area Commercial Area Residential Area Silence Zone Day (0600-2200 hours) 75 65 55 50 Night (2200 0600 hours) 70 55 45 40 All Values in db (A) Logarithmic Averages of monitored noise levels are well within the norms prescribed for residential area. The results of work zone noise are given in Table 10 and compared with OSHA norms which are mentioned in Table 11. Table 10: Results of Work zone Noise Monitoring (July 2011) WN-1 : Near mine incline -1 Date 15.07.2011 Time Leq. 1. 09.10 AM to 09.25 AM 58.2 2. 10.10 AM to 10.25 AM 60.6 3. 11.10 AM to 11.25 AM 56.8 4. 12.10 AM to 12.25 AM 59.2 5. 13.10 PM to 13.25 PM 55.2 6. 14.10 PM to 14.25 PM 54.8 7. 14.30 PM to 14.45 PM 53.2 8. 15.30 PM to 15.45 PM 55.3 All Values in db (A) Table 11: Permissible sound pressure level as per OSHA norms Duration per day (hour) Sound pressure Level db (A) allowed response 8 90 6 92 4 95 3 97 2 100 At all the work zone noise monitoring stations values of Leq. are well within the OSHA norms of 90 db (A) prescribed for 8 hours duration. 2011 MECON Limited, All right reserved Page 6 of 6