The report also stated that officials in charge of the sites lacked knowledge of sand mining and that they should be trained in scientific methods of mining.
The Committee of Commissioners, appointed by the Madurai Bench of the Madras High Court, submitted a report on Tuesday on its inspection of sand mining in Tiruchi and Karur areas.
The environment clearance and quarrying permission obtained were not in compliance with laws and were in violation of the State Environment Impact Assessment Authority clearance.
The committee said in its report that the entire river was riddled with pits and ponds due to unscientific mining being carried out beyond permitted levels.
The committee comprised advocates R. Alagumani and B. Saravanan and P. Ravichandran, Head, Department of Plant Science, Manonmanian Sundaranar University.