ST. PAUL (AP) -- The Minnesota Pollution Control Agency is asking Ford Motor Company to examine a dump site at its former St. Paul plant this month to make sure it is free of contamination.

Reports say that if anything is found to be a risk, Ford will have to clean it up.

An environmental group wants Ford to sift through the mound where the company disposed of paints and solvents for 20 years.

The mound sits about 65 feet above the Mississippi River and covers about 4 acres.

Officials with Ford Land in Dearborn, Michigan, say the company is voluntarily working with the state agency to investigate and clean up the site.

Ford says tests so far show that groundwater and the river are not impacted.