Congressional District # 08
EAST TROY CONTAMINATED AQUIFEREPA ID# OHSFN0507962
Last Updated: November, 2011
The East Troy Contaminated Aquifer site is located in the eastern portion of the City of Troy, Miami County, Ohio along the western bank of the Great Miami River. The site boundaries and all contamination source(s) have not yet been identified. The remedial investigation and feasibility study (RI/FS) will provide this information. Existing data demonstrates that the site includes at least a 25-block area where volatile organic compounds (VOCs) have been identified in groundwater, soils, and indoor air space of residential, public and commercial properties. Across the Great Miami River, within 0.25 miles of the site is the city of Troy's East Well Field which serves as a drinking water supply for the city of Troy. Since 1988, the VOCs, cis-1, 2-dichloroethane (cis-1, 2-DCE) and trichloroethene (TCE), have been consistently detected in samples taken from the East Well Field.
The site was proposed on the National Prorities List (NPL) in September 2007, and one year later in September 2008, the site was finalized on the NPL.
U.S. EPA is the lead agency. Ohio EPA is providing support to U.S. EPA.
Threats and Contaminants
Contaminants identified in ground water include tetrachloroethene (PCE), TCE, cis-1, 2-DCE, and vinyl chloride. Elevated levels of PCE in groundwater and soil gas were detected in a three block residential area between Franklin Street and Main Street. PCE concentrations as high as 801 parts per billion (ppb) in groundwater and 58 ppb in soil gas were found in samples collected from residential yards along Franklin Street. The EPA has documented a total of sixteen residential locations and one elementary school with indoor air PCE, and/or TCE vapor concentrations exceeding the Agency for Toxic Substances and Disease Registry (ATSDR) health screening level of 1.2 ppb or 0.4 ppb, respectively. The EPA installed vapor abatement systems at sixteen homes and one elementary school as part of a 2007 U.S. EPA removal action.
Although VOCs detected in samples from the East Well Field are below federal Maximum Contaminant Levels (MCLs), contaminated ground water (plume) is migrating towards the well field, which provides drinking water to approximately 28,000 people in the city of Troy. Additionally, vapor intrusion of VOCs into indoor air is a concern for residents living in the area.
Field work for the RI/FS began in the summer 2010 with the collection of surface water and sediment samples from the Great Miami River. Groundwater samples were also collected from 19 existing monioring wells in residential neighborhoods. In the fall 2011, 14 new groundwater mointoring wells will be installed in the neigbhrohood and groundwater samples will be collected from the new wells and the 19 existing wells. Surface and subsurface soil samples will also be collected and a sewer investgiation conducted. Sub-slab and indoor air sampling in homes will begin in the fall/winter 2011. Homes that were not sampled as part of the 2007 EPA removal action will be sampled first followed by homes that may be at risk of exposure due to vapor intrusion. Homes with existing vapor abatement systems will also be sampled to confirm the systems are operating properly. Initally 36 homes will be sampled in November/December. Up to 200 homes may be tested as part of the vapor intrustion investigation.
The EPA conducted a public meeting in Troy, Ohio on October 19, 2011 to update residents on the planned RI sampling and to explain the vapor intrustion mointoring that will take place in the resdiental neigbhrohoods. Representatives from the Ohio EPA, Ohio Department of Health, the city of Troy, and the Mayor attended. The EPA will keep residents informed throughout the RI/FS and vapor intrusion investigation via fact sheets, EPA's web site, public meetings, and newspaper releases.
ContactsRemedial Project Manager, U.S. EPA
shari kolak (firstname.lastname@example.org)