OSWER/OSRTI Washington, DC 20460



## N ATIONAL 

## P RIORITIES 

## L IST 

## (NPL)

***Proposed Site*** Decem ber 2013


### WALKER MACHINE PRODU CTS , INC. Collierville, Tennessee Shelby County

 **Site Location :**  The Walker Machine Products Site is located at 459 Washington Street. The property is approximately 5 acres in size situated along the south side of Washington Street east of downtown Collierville. There are several industrial properties in the vicinity ; however, there is a residential neighborhood to the south, across Halley Street.

 **Site History:**

Walker Machin e produced automated machine screw products from 1953 until approximately 2002. Langley Wire Cloth has operated at the facility since 2006 manufacturing filters from wire cloth. This operation is not associated with Walker

Machine Products and is not the source of contamination at the s ite.

 **Site Contamination/Contaminants:**
Walker Machine Products used chlorinated solvents, including tetrachloroethene (PCE) and 1,1,1

- trichloroethane (TCA), to clean the finished products. A 1987 Tennessee Occupational Safe ty and Health Administration (OSHA) Inspection Report stated the company was draining spent solvent onto the ground and into the sewer drain in the rear of the building. An oil/water separator was used by Walker Machine Products which received solvent wast e as well. The primary source of soil and ground water contamination is found in the area of the oil/water separator.

 **Potential Impacts on Surrounding Community/Environment :**  Soil and ground water below the site has been contaminated with PCE, TCA and th eir degradation products. The ground water contaminant plume has migrated off

- site under the adjacent industrial property

- Witt International. The c ity of Collierville provides drinking water to residents from five drinking water plants that pump water from twelve different wells. Well field #1, consisting of 3 wells, is approximately 1⁄2 mile from the s ite, and only 1⁄4 mile from the documented edge of the ground water contaminant plume. This well field services 12,284 residents.

 **Response Activities (to date ):**  The EPA and the Tennessee Department of Environment and Conservation (TDEC) first investigated the s ite in 2007, collecting surface and subsurface soils and installing and sampling monitoring wells. From 2010 to 2012 the EPA and

TDEC installed additiona l monitoring wells and soil gas sampling to try to determine the extent of soil and ground water contamination. Although the ground water contamination extends below the Witt International property, no sources of the contamination were found on the Witt International property. The source of the contamination was determined to originate on the former Walker Machine Products property.

 **Need for NPL Listing:**

The s tate of Tennessee referred th e site to the EPA because the ground water contamination has migrat ed and is approximately 1⁄4 mile from the c ity o f Collierville Well #1 . Other cleanup alternatives were evaluated, but are not viable at

this time because Walker Machine Products is closed and the owner is deceased. No other regulatory programs are able to

a ddress the ground water contamination. The EPA received l etters of support for placing this site to the NPL from the s t ate.

[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 eff ects of exposure to these substances on human health, please see the Agency for Toxic Substances and Disease Registry (ATSDR) ToxFA Qs. ATSDR ToxFAQs can be found on the Internet

at http://www.atsdr.csc.gov/toxfaqs/index.asp or by telephone at 1

- 888

- 42

- ATSDR or 1

- 888

- 422

- 8737.