Letter Health Consultation: Northwest States Portland Cement Company Site, Mason City, Iowa. EPA Facility ID: IAD980852431, June 13, 2008.

摘要

In 1987, the EPA Region 7 conducted a site inspection of the Northwestern States Portland Cement Company Site (NWSPCC). Based upon the results of the site inspection, the NWSPCC site was proposed for the National Priorities List (Superfund List) in June 1988 and was added to the final NPL Listing in August 1990 (1). In 1990 the Northwestern States Portland Cement Company completed a Remedial Investigation/Feasibility Study (RI/FS) under the enforcement oversight of the IDNR. In March 1990, the Proposed Plan identifying the preferred remedy was presented to the public, starting the period for public comment (1). The Iowa Department of Public Health (IDPH) produced a Health Assessment for the NWSPCC site, which concluded that the Site was a potential health concern because of the potential risk to human health from possible exposure to hazardous substances at concentrations that may result in adverse health effects. The IDPH assessment determined that the chemicals of concern for potential human exposure were; chromium, lead, sodium, sulfate, phenols, and elevated pH via ingestion of groundwater from on site and off site private wells. Also, the Health Assessment determined that human exposure to elevated pH may have occurred in the past via dermal contact, ocular contact, and incidental ingestion of on site soil, sediment, surface water, and groundwater, and via inhalation of dust.