OSWER/OSRTI Washington, DC 20460


## N ATIONAL 

## P RIORITIES 

## L IST 

## (NPL) ***Proposed Site *** May 2013 

### KEYSTONE CORRIDOR GROUND Indianapolis, Indiana WATER CONTAMINATION Marion County

 **Site Location :**  Th e Keystone Corridor Ground Water Contamination site is a c hlorinated solvent p lume l ocated in Indianapolis

, Indiana

.

 **Site History:** Investigations by I ndiana D epartment of Environmental M anagement could not determine any one specific source or

sources of contamination due to the complex geology and the number of potential sources. Forty known users or handlers of solvents have been identified as possible sources. Individual plumes are comingled and cannot be distinguished among contaminants or sorted for attribution due to the complex geology.

 **Site Contamination/Contaminants:** The ground water plume c on sis ts of chlor in ated solven ts , including tetrachloroethene ( PC E), trichl or oethene (T CE), cis-1 ,2 -dichloroethen e (cis-1,2-DCE) and vinyl chloride

.

 **Potential Impacts on Surrounding Community/Environment :**  Five municipal wells have had historical detections of volatile org anic compounds ( VOC s). In one of the five wells, vinyl chloride has been detected above its Safe Drinking Water Act Maximum Contaminant Level (MCL). Over 13,844 people use the drinking water from these five wells

. The local water company continues to monit or and blend the water be fore distributing to the public.

 **Response Activities (to date):** There is an ongoing removal action at Tuchman Cleaners

, a nearby former industrial dry cleaning facility. App ro xim ate ly 29,850,000 g all on s of w ater were pump ed and tr eated from the contaminated aquif er

from Dec emb er 1995 to D ec emb er 200 2 at Tuchman Cleaners

. One municipal well has been taken out of production due to its proximity to the path of the plume

. The EPA is installing vapor mitigation systems at residential properties that are above screening levels

.

 **Need for NPL Listing:** The site poses a risk to the community due to actual and potential contamination in municipal wells and i n several monitoring wells

. NPL listing would allow for proper and timely investigation of the nature and extent of the contamination of the potential sources, and enable the EPA to determine cleanup alternatives in order to protect human health and the environment. Other federal and state cleanup programs were evaluated , but are not v iable at this time

. The state has provided a letter of support for listing.

[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 the Internet a t http://www.atsdr.cdc.gov/toxfaqs/index.asp or by telephone at 1

- 888

- 42

- ATSDR or 1

- 888

- 422

- 8737.