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(i) The presence of Domestic sewage is predominant in both Nallaru Odai and Nanjarayan Lake. Discharge from illegal dyeing units/ incidental or accidental over flow from man holes of pumping mains of CETPs may flow through Nallaru Odai which may not be ruled out.

(ii) During monsoon, joining of surface runoff (from old solar pans, sludge storage area and ETP area) from M/s Angeripalayam CETP into Nallaru Odai may not be ruled out.

(iii) The accumulation of decomposed silt, water weeds and garbages in the Nallaru Odai confirms the poor maintenance and least importance given to water body.

(vii) For assessing the quantum of compensation for restoration of Lake detailed assessment study of Lake is required.

7.0 Suggestion of Committee to protect the water quality of Nanjarayan Lake :

To protect water quality of Nanjarayan Lake, it is suggested to take following measures
(a) Rejuvenation of Nallaru Odai :
• To take steps to rejuvenate the Nallaru Odai by evacuating the encroachments as per the Re-survey Records of Tamilnadu Government.
• To take regular maintenance of Nallaru Odai by desilting and renovating the side walls of Odai.
1. No Bleaching and Dyeing units are discharging effluent into Nallaru Odai directly or indirectly. The dyeing and bleaching units located near the Nallaru Odai are either member units of CETP or units provided with Individual Effluent treatment plant & ZLD treatment system.
2. During inspection of the CETP and its member units no discharge of trade effluent noticed.
3. Out of the above mentioned 71 units, 11 units were violating and illegally discharging the untreated trade effluent directly or indirectly either to Nallar Odai or onland for open percolation / nearby drain which in turn reaches Nallaru Odai out of this 6 units were issued with Power supply disconnection order through District Co-ordination Committee on 16.12.2021 and the same has been forwarded to SE, TNEB, Tiruppur for compliance and 5 units were issued with Show cause notices.

3. The observation on Nallaru Odai & Nanjarayan Lake:

Nallaru Odai:
During inspections on 11.12.2021, 13.12.2021 and 15.12.2021 the following observation were made
a) During inspections there was considerable flow noticed in the Nallaru Odai. No coloured flow was noticed in the Nallaru Odai. In the banks of Nallaru Odai dumping of Municipal solid waste was noticed.
b) The TDS value on the day of inspection in the Nallar Odai at Thirumuruganpoondi Bridge is 957 mg/l and at the bridge near M/s. Angeripalayam CETP is 1551 mg/l as per the portable TDS meter.