Aerial Ropeways - Environmental Clearance

EIA Guidance Manual– Aerial RopewaysAnnexure - 4Criteria for Raw Water Used for Organized Community WaterSupplies (surface and ground water) Primary ParametersParameters Range/Limiting Value NoteUse with onlydisinfectionUse afterconventionaltreatment1. pH 6.5 to 8.5 6.0 to 9.0 To ensure prevention of corrosionin treatment plant and distribution system and interference incoagulation andchlorinating.2. Colour Pt. < 10 < 50 Color may not get totally removedscale Hz Unitsduring treatment3. Suspended < 10 < 50 High SS may increase the cost ofSolids mg/ltreatment.4. Odour, dilution < 3 < 10 May not be tackled duringfactortreatment.5. DO, (%saturation) 90-100 80-120 May imply higher chlorinedemand.6. BOD, mg/l < 3 < 5 Same as above.7. TKN, mg/l < 1 < 3 Same as above.8. Ammonia, mg/l < 0.05 < 1 Same as above.9. Faecal coliform < 200 < 2000 Not more than 20%MPN/100 mlsamples show greaterthan limit.10. EC, µm/hos/cm < 2000 < 2000 High conductivity impliesdissolved high solids makingwater unpalatable.11. Chloride, mg/l < 300 < 300 May cause physiological impactand unpalatable taste.12. Sulphates, mg/l < 250