A preliminary soil survey is a report that contains all available information about a piece of land. You can think of:

• old aerial photographs and maps 
• environmental data (e.g., permits)
• overview of the buildings on the site or 
• the presence of fuel tanks

In the outcome of the (possible) soil contamination, we start from the data in the report. Then we draw up a research strategy. This strategy forms the basis for the soil investigation.