So, you want to perform an environmental initial assessment in your lab in order to implement control.
Let us start with an example:
You need to determine all aspects and impacts under normal, abnormal and periodical situations. Then you need to evaluate those impacts and determine what kind of control or improvement you need in place, to improve your relationship with the environment.
Let us consider, as an example, that you are with your lab plant for “hazardous chemical waste” (both in chemical form and materials contaminated with chemicals such as filters from a vent hood): Gather a team from the lab and go to each location and write, draw, comment in your lab plant all situations, all activities, where hazardous chemical wastes can be generated. You can repeat this procedure for every environmental aspects.