4. description of the environment - Gujarat Pollution Control Board

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Final Feasibility Report Preparation of Feasibility– cum-Preliminary Design for 4/6 Laning of Jetpur-Somnath section of NH 8D, Package No: NHAI/DBFOII/DPR/02 VOLUME III: ENVIRONMENTAL IMPACT ASSESSMENT Sl No Parameters Concentration 6 BOD (mg/l) BDL 7 Total Hardness (mg/l) 7400 8 Chloride (mg/l) 18504 9 Sulphate (mg/l) 4608 10 Phospate (mg/l) 7.0 11 Turbidity None 12 Lead (mg/l) BDL 13 Iron (mg/l) BDL 14 Arsenic BDL 15 Total Coliforms (CFU/100 ml) 17 Source: Sampling and Analysis by Vaibhav Enviro Consltants, Ahmedabad HYDROLOGY & IRRIGATION GROUND WATER POTENTIAL 3 (Yield in M hour) 20-50 Discontinuous aquifers with limited thickness down to 300m or more 5-20 Groundwater restricted to weathered residium tracture zone having secondary porosity. Sea Reservoir Sandstone, Shale conglomerate Limestone, Grit Blast with intertrappean Clay GROUND WATER HYDROLOGY 15 Buffer Zone (Upto 15 km from corridor) Project Corridor Taluka boundry Direction of groundwater flow Water Table Contour (m.a.msl.) Well, Tube-well Spring Canal Hard Rock Area Saline Rock Area 10 Porbandar 120 Ranavav Arabian Sea 5 0 5 10 15 Kilometre 5 15 20 Upleta Manavadar Vanthli 10 Mangrol 10 15 15 Somnath Malia Miyana 10 Padadhari Rajkot 80 Lodhika 80 10 15 10 20 40 160 10 80 Wankaner Gondal Jam Kandorna Kotda Sangani chorwad Figure 4-8: Hydrology of the Project Area Dhoraji Junagarh Surface Water: The pH value ranged between 7.36-7.90. TDS content ranged between 170- 1430 mg/l while Chloride values ranged from 86 to 482 mg/l respectively, well below the tolerance limits. Iron content is found to be nil. There is no significant presence of trace metals in Maliya Jetpur Talala Morbi 5 120 Una Jasdan 4-16

Final Feasibility Report Preparation of Feasibility– cum-Preliminary Design for 4/6 Laning of Jetpur-Somnath section of NH 8D, Package No: NHAI/DBFOII/DPR/02 VOLUME III: ENVIRONMENTAL IMPACT ASSESSMENT the surface waters. There is no faecal contamination as the Total Coliform bacteria and E.Coli are nil. Nil turbidity indicates that there is no sediment load in the water bodies and negligible soil erosion. Oil and grease, toxic constituents like phenolic compounds and cyanides are found to be absent. While comparing with the CPCB Norms for Surface Waters, all parameters are found to be within the standard limits. Ground Water: The ground water sources had agreeable colour, taste and odour. The pH value ranged between 7.40-7.78, generally above the neutral mark and within the permissible limits for drinking water. TDS value ranged between 31-32 mg/l, in some stations and is within the permissible limit for drinking water (500 mg/l). Chloride values ranged from 335mg/l to 482 mg/l, iron content was nil, thus within permissible limits. BOD is also absent. There is no significant bacteriological contamination of these sources. Total alkalinity is found to be within the permissible limits. Total Hardness ranged between 258-325 mg/l and exceeds the limit in Jetpur Industrial Area. Heavy metals like iron, zinc, arsenic, mercury, lead, cadmium, chromium and selenium are absent. In general, the ground water quality in the project corridor is found to be in compliance with IS:10500 Standard for Drinking Water. 4.6 NOISE ENVIRONMENT 4.6.1 Noise Quality To assess background noise levels in the study area, ambient noise monitoring is conducted. A total of fourteen (14) locations were identified along the project road, based on different categories of area. Ambient noise level or sound pressure levels (SPL) are measured by a portable sound level meter having built in facilities to read noise level directly in dB(A). From the SPL values, equivalent continuous sound pressure level values (Leq) are calculated. Noise measurement is conducted as per IS: 4954 as adopted by CPCB. Ambient noise level monitoring has been carried out during October 2008. At each location monitoring was conducted continuously over a period of twenty- four hours to obtain Leq values at uniform time intervals of 1 hour. Description of the noise monitoring stations and the Leq values at each station are given in Table 4-11. The noise monitoring stations have been depicted in Figure 4-9 4-17

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