The 200-acre Des Moines TCE site is located in south-central Des Moines, Iowa, on the east side of the Raccoon River. The property is owned by Dico, Inc. The site is mainly associated with Dico�s operations at the property, which included steel wheel manufacturing and chemical and pesticide formulation for approximately 40 years. Dico�s operations at the site released trichloroethene (TCE), 1,2-dichloroethene (1,2-DCE), and vinyl chloride to the groundwater, residual pesticides and metals to shallow soils, and pesticides in buildings and soils on the southern end of the property and drainage areas. The site is divided into four operable units (OU):
� OU 1 � groundwater Trichloroethylene (TCE) plume on the Dico property;
� OU 2 � originated as source soils associated with TCE groundwater contamination, but later focused on residual pesticides and metals in shallow soils;
� a source area of Tetrachloroethylene (PCE) groundwater contamination north of
OU 4 � pesticides in buildings and soil on the
southern end of the Dico property, and in drainage areas of the Dico property.