Numerous oil and sludge pits were in use while the refinery was in operation. Soil samples collected by EPA in June 1985 and April 1986 contain barium and lead substantially above background levels. Two interconnected aquifers are present beneath the site. The upper one is associated with alluvial deposits of the North Canadian River and the lower one is associated with the Garber- Wellington Formation. The combined aquifers range from about 300 to 900 feet thick.
Soil permeability is moderate to low.
About 32,500 people obtain drinking water from wells within 3 miles of the site, including municipal wells serving Del City and Spencer. Drainage at the site is to the south and the east along a ditch until run-off collects along the eastern perimeter road. The site is not completely fenced, making it possible for people and animals to come into direct contact with hazardous substances. The description may change as additional information is gathered on the sources and extent of contamination.