c# convert int value columns into Boolean

I am trying to understand the logic that is used to convert an integer value saved on a single column to capture several Boolean responses and converts (populate the Boolean response) into a single form with several yes/no questionnaires.
I inherited this app from a previous developer who is no longer with the company, and I found it challenging understating/following the logic or pattern applied here. I like the idea of keeping all the values into one column (because I am trying to avoid capturing and recording each response into a single column, because I will need more than 40 columns)
so I am looking for some explanation on how this works or any other better way on how to do this?

Here is the piece of code that is used here: (if I follow the pattern used here to capture more response, I will not get the desired response all the time)
private static int GetPysicalTableColumn(PDIncidentBO objIncident) { ...