OSWER/OSRTI Washington, DC 20460 

## N ATIONAL 

## P RIORITIES 

## L IST 

## (NPL) ***Proposed Site *** September 2015 

### WEST VERMONT DRINKIN G WATER CONTAMINATION Indianapolis , Indiana Marion County

 **Site Location :**  The West Vermont Drinking Water Contamination s ite consists of a co m mingled ground water plume containing chlorinated solvents. The ground water plume is approximately 18 acres and is contaminati ng drinking water wells in a mixed residential/commercial nei ghborhood on the west side of Indianapolis, Marion County, Indiana.

 **Site History:** The Marion County Public Health Department (MCPHD) discovered the site in 2009. Indiana Department of Environmental Management ( IDEM ) referred the site to the EPA Removal Program

. The EPA installed temporary water treatment systems in three residences to help remove vinyl chloride in drinking water

. Investigations by the EPA and IDEM have since concluded that two nearby facilities located northeast of the neighborhood are responsible for the contamination

.
 **Site Contamination/Contaminants:** The plume consists of chlorinated solvents, specifically trichloroethene (TCE), tetrachloroethene (PCE) and v inyl chloride. The site poses a health risk for residents due to contamination above the Safe Drinking Water Act ’s Maximum Cont aminant Level (MCL) for vinyl chloride

.

 **Potential Impacts on Surrounding Community/Environment :**  Concentrations of vinyl chloride were found above safe drinking water standards in three residential drinking wells. There are 40 homes in the neighborhood within a mile that rely on private water wel ls that could potentially be affected. The contaminated plume also has the potential to migrate the four miles to where two separate municipal well fields are located that serve water to more than 18,000 people.

 **Response Activities (to date):** In August 2009, the MCPHD found vinyl chloride in residential wells above safe levels. That same year, IDEM formally requested assistance from the EPA Removal Progr am

. The EPA installed temporary water treatment systems in the three residences to help remove vinyl chloride in drinking water. The EPA also conduct ed a hydrogeologic investigation to identify the source of contamination in the residential wells. MCPHD mo nitors drinking water wells for this neighborhood on a regular basis.

 **Need for NPL Listing:** The state of Indiana referred the site to the EPA because the ground water plume can potentially contaminate nearby drinking water wells and municipal well fields . Other federal and state cleanup programs were evaluated, but are not viable at this time because responsible parties have not adequately address ed the ground water contamination under

s tate authority. The EPA received a letter of support for placing this site on the NPL from the state of Indiana

.

[The description of the site (release) is based on information available at the time the site was evaluated with the HRS. The description may change as additional information is gathered on the sources and extent of contamination. See 56 FR 5600, February 11, 1991, or subsequent FR notices.]

For more information about the hazardous substances identified in this narrative summary, including general information regarding the effects of exposure to these substances on human health, please see the Agency for Toxic Substances and Disease Registry (ATSDR) ToxFAQs. ATSDR ToxF AQs can be found on
t he Internet at http://www.atsdr.cdc.gov/toxfaqs/index.asp or by telephone at 1

- 888

- 42

- ATSDR or 1

- 888

- 422

- 8737.