VELLORE: Collector C. Rajendran has directed officials of the Tamil Nadu Pollution Control Board (TNPCB) to immediately visit the places in the Ambur area where there were complaints of tanneries discharging untreated effluents into the Palar, and identify and close such tanneries. He was presiding over a monthly agriculturists' grievance day meeting at the Collectorate here on Friday. Farmers in the Ambur area had complained that some tanneries were discharging untreated effluents into the Palar on the sly, contaminating groundwater and affecting health of residents. Mr. Rajendran regretted that the TNPCB had not taken any action on such complaints.