Order of the National Green Tribunal in the matter of Society for Protection of Culture, Heritage, Environment, Traditions and Promotion of National Awareness (CHETNA) V/s. National Capital Territory of Delhi & Others dated 22/09/2017 regarding restoration of water bodies in Delhi. With regard to use of EPDM (ethylene propylene diene monomer (M-class) rubber) as base material for the water bodies there is difference of opinion as the Applicant NGO CHETNA has submitted that use of EPDM as a material will not be environmental friendly and it will cause stagnation of water.