US Highway 65 / IA-330 Improvements Polk and Jasper Counties, Iowa : Limited Phase I, Environmental Site Assessment, 1998

The Iowa Department of Transportation (IDOT) is currently considering improvements for US Highway 65 (US-65) and Iowa State Highway 330 (IA-330) in Polk and Jasper Counties, Iowa. As part of its project planning effort, IDOT is preparing an Environmental Assessment (EA) report which will include a section entitled "Hazardous Waste" to identify known sites in or near the proposed corridors that are, or could be, contaminated with hazardous or petroleum substances.

Environmental Assessments: A How-To Manual, 2001

This manual is intended to provide complete but concise information on how to prepare an Environmental Assessment in accordance with Federal Highway Administration (FHWA) regulations. These regulations incorporate the requirements of the U.S. Department of Transportation Order 5610.lC, "Procedures for Considering Environmental Impacts," as found in 23 CFR 771 (Federal Regulations (F.R.) August 28, 1987) and the "Regulations for Implementing the Procedural Provisions of the Environmental Policy Act," as set forth by the Council on Environmental Quality (i.e., 40 CFR Part 1500-1508).

Supplemental Pre-Location Report, U.S. 18, Mason City Bypass I-35 to Rudd : Cerro Gordo and Floyd Counties, 1992

The purpose of this report is to compile and update the prior studies in order to select viable alternatives for inclusion in the Environmental Assessment to be prepared for this project.

Phase I Environmental Site Assessment of the Proposed State Highway 60 Bypass Around Le Mars, Iowa, Plymouth County, Abridged Phase I, 2001

This report serves as a record of the Assessment activities, which consisted of a review of local, county, state, and federal records, interviews, and site reconnaissance. Sections 2 through 4 of this report document information gathered. during the records search and site visits for the Assessment. Section 5 presents the findings and conclusions of the Assessment.

Public health assessment : Railroad Avenue groundwater contamination, West Des Moines, Polk County, Iowa EPA facility ID: IA0001610963 (2004)

The Railroad Avenue groundwater contamination site (the site) is in West Des Moines, Polk County, Iowa. Located on approximately 120 acres. The site comprises mixed residential, industrial and commercial properties. Underneath the site, chlorinated volatile organic compounds (VOCs) have contaminatcd the shallow (i.e., 30-50 feet deep) groundwater. These compounds have compromised several shallow wells within the West Des Moines water works system. A contamination source, however, has not yet been identified. In 1993, routine water analysis by the City of West Des Moines identified 1, 2 cis-dichlorocthylcne (1, 2 cis-DCE) at a concentration of 1.2 μg/L (micrograms) per liter of water) in the water supply. Subsequently. several shallow municipal wells were found to be contaminated by VOCs, including 1. 2 cis-DCE, trichloroethylene (TCE), tetrachloroethylene (PCE) and benzene. Five of these wells have been taken out of service. Because of the impact on the West Des Moines water supply, the U.S. Environmental Protection Agency (USEPA) has assigned the site to the National Priorities List. Surface water und sediment at the site have not been impacted by the VOCs. Testing for VOCs in surface soils has not revealed any significant VOC contamination. Subsurface soils -- generally 8 feet or greater in depth -- are contaminated with VOCs, but at levels which should not present a health hazard. The past, present, and future health hazard category chosen for this site is no apparent public health hazard. This category is used when exposure to toxins might be occurring or might have occurrcd in the past, but at levels below any known health hazard. Analysis of available environmental data has not revealed that residental or commercial water customers are or have been exposed to VOCs at concentrations that might cause any adverse health effects.