A.I have read your query and done some research. What you hope for is not going to be easy. There are many such stories in the Industrial history of India that have become ecological disasters. Among the worst sufferers were the people of Sukinda Valley of Orissa due to chromite ore mining and Vapi in Gujarat.
B.Firstly, from what you say it looks like the industrial giants have colluded with the State government officials to flout norms. You cannot fight this alone because it is too big a task to be handled. Moreover, the Brahmaputra Cracker and Ploymer Limited, BCPL is a Government of India enterprise. If you have to take on the state and central government, you need enough evidence and backup to do so.
C.The BPCL was set-up 15 Kms from Dibrugarh as part of the historic Assam Acoord of 1985 to bring socio-economic development. It's key players are GAIL India, OIL India, NRL, and Government of Assam.
i).It has the environment clearance (http://www.bcplonline.co.in/pdf/Environment/ENVIRONMENTAL%20CLEARANCE.pdf),
ii). does regular monitoring (http://www.bcplonline.co.in/pdf/Environment/LATEST%20ENVIRONMENT%20MONITORING%20DATA.pdf).
iii).As per the 6 monthly Enviornmental compliance report, it seems to meet the compliance criteria.(http://www.bcplonline.co.in/pdf/Environment/LATEST%20SIX%20MONTHLY%20COMPLIANCE%20REPORT.pdf).
D.If you still want to go ahead, you need
1. Evidence of the native people being displaced
2. Statistics of air quality, ground water, existence of farms before the industry started and the degree of pollution that exists now.
3. you need a good team of native people who have all suffered, so that you have enough representation
4. you need photographic evidence of all the adverse effects the industry and its pollutants have caused.
5.The services of good NGO's that are passionately committed to fighting for the people and for the nature.
6.Good contacts in the media ( TV,internet and paper) who can represent your arguement in an orderly manner.
7. A team of excellent lawyers who are experts in public interest litigation.
E. So, first gather enough evidence which would be maps, old government land recorded, water table and ground water sources. Water,air and soil tests prior to the setting up of the industry,
F.The now find a reputed organisation, that can assess the land, air and the river water quality and the drinking water to assess the level of pollutants and the toxic minerals in water. Government hospital records that have the outpatient and in-patient admission and diagnosis related to Industrial pollution associated illness when the people are exposed to bad air, water and food sources.Please also get the fish caught from the river examination by reliable sources for the contaminants and heavy metals.Next, make a list of the thousands of people who are affected.
G.Once you all this please verify who the land was acquired for the industries. You need to have the copies of the original records as to how the land was acquired prior to 2006. I say this because, in India such large land acquisitions should meet the guidelines laid down by the RIGHT TO FAIR COMPENSATION AND TRANSPARENCY IN LAND ACQUISITION, REHABILITATION AND RESETTLEMENT ACT (this replaced the old Land Aquisition Act of 1984).
Your legal team has to scrutinise the documents and see whether there have been breaches in the compensation, rehabilitation of people etc. If you find irregularities, then your case becomes more stronger.
H. One the whole, you need to get a detailed report ready something like this(http://cpcb.nic.in/displaypdf.php?id=TkdUL0ZpbmFsX0FwcHJvdmVkX0RyYWluX1JlcG9ydF8yNy4wMy4yMDE3LnBkZg==). You can refer to the detailed cases of People suffering from large scale pollution from this website (http://cpcb.nic.in/ngt-court-cases/).
I. Next, approach the Regional Office, Guwahati, Pollution Control Board Assam,Milanpur, West Jyotinagar, Bamunimaidam, Guwahati, Assam 781004. for help. Specifically, check out the
i).'ZONING ATLAS' as to where your area fall in
ii). The category of the industry, does it fall under the 'Red'- heavily polluting Industries.
J. Once you have all the relevant details in hand, as a delegation of people with your local leaders of various communities and local politicians, try and meet the Minister for Enviornment and Hill areas development ministers. There offices are in Janata Bhawan, Dispur, Guwahati, Assam.
Meet them, explain your plight and what solutions you are expecting in terms of jobs for the affected people, cash as compensation, medical expenses etc.
K.You need to have patience and dedicate time to regularly follow-up. Use the power of social media and the news media to highlight the case and your suffering. Meet one of the popular TV channels, like the newshour or republic tv who can verify your claims and bring attention to this case.