This order pertains to property located in the Lower West Side (Pilsen) area of Chicago, Cook County, Illinois. Specifically, an approx. 25.1-acre semi-rectangular residential area bound to the north by West 18th Place, to the east by an alley halfway between South Allport Street and South Racine Avenue, to the south by West 21st Street, and to the west by South Loomis Street. This order required the respondent to conduct removal actions described herein to abate an imminent and substantial endangerment to the public health or welfare or the environment that may be presented by the actual or threatened release of hazardous substances at or from the site.