| 1 | Virtusa consulting service p limited |  sakthivel | | |
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| 2 | Velachery Res. Area, Chennai - CPCB |  Central Pollution Control Board | | |
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| 3 | Perungudi, Chennai - TNPCB | Central Pollution Control Board | | |
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| 4 | Royapuram, Chennai - TNPCB | Central Pollution Control Board | | |
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| 5 | Arumbakkam, Chennai - TNPCB | Central Pollution Control Board | | |
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| 6 | Kodungaiyur, Chennai - TNPCB | Central Pollution Control Board | | |
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| 7 | Manali, Chennai - CPCB | Central Pollution Control Board | | |
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