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Order of the National Green Tribunal (Southern Zone, Chennai) in the matter of Mathialagan Vs Union of India dated 05/02/2015 regarding order of the State Environmental Impact Assessment Authority (SEIAA), Tamil Nadu dated 20.5.2013 by which the SEIAA has granted an approval of Environmental Clearance (E.C.) for the proposal of the 6th respondent, project proponent for extracting quarry sand (Savudu) deposited at survey Nos. 138/1B1, 138/2A, Thillaivilagam Village, Thiruthuraipoondi Taluk, Thiruvarur District .