A private party may obtain an agreement for the investigation and/or remediation of potential contamination caused by leaking petroleum storage tanks, spills or other hazardous materials that may have migrated onto the right of way.

Investigation and remediation should normally involve drilling and monitoring wells on the right of way. Well locations should be limited to areas that provide safe access without interfering with the normal operation of the highway system. Wells should not be allowed in travel lanes, shoulders or medians (not even grassy medians).