I am opening a senior secondary school in Mohali (Punjab ). Will run a kindergarten school for first two years and later set up middle school and the high school. Initial strenth of the students will be 200 which will reach 1500-2000 when we open high school. Wanted to ask the following: 1) Do I need to install a STP for the same as someone told me that as per the PPCB norms you install Septic tank till the students are 200 but after that you have to install a Sewage Treatment Plant. 2) If STP is required, please tell me the capacity of STP? 3) What are the norms of the Punjab Pollution Control Board? 4) Do I also need environmental clearance?