Why is it important to have analytical data during a site assessment?

Having analytical data during a site assessment is crucial because it provides definitive proof of contamination. The assessment process aims to determine whether hazardous substances, such as petroleum products, are present in the environment due to leakage or spills from underground storage tanks. By obtaining analytical data, such as laboratory test results, assessors can ascertain the type and concentration of contaminants in soil, groundwater, or other media. This information not only helps in confirming the presence of contamination but also aids in understanding the extent of the impact.

The importance of definitive proof cannot be understated, as it forms the basis for any subsequent actions that may need to be taken, such as remediation efforts or regulatory compliance evaluations. Without this concrete evidence, decisions regarding the environmental management of the site could be misguided or ineffective.

Field data and methods like PID readings may offer preliminary insights but may not be sufficient on their own to establish the presence of contamination without the supporting evidence that analytical data provides. This makes analytical data a key element of a thorough and reliable site assessment.