OLEM/OSRTI

Washington, DC 20460

NATIONAL PRIORITIES LIST (NPL) 

***Proposed Site*** April 2016 

VALLEY PIKE VOCs Riverside, Ohio 

Montgomery County 

 Site Location:

The Valley Pike VOCs site, located in Riverside, Ohio, is comprised of ground water and soil contaminated with volatile 

organic compounds (VOCs). A residential neighborhood at the site has been impacted by vapor intrusion from the 

contaminated ground water plume. The neighborhood is located approximately 900 feet southwest of the Mullins Rubber 

Products, Inc. (MRP) facility and includes approximately 500 residences. 

 Site History:

MRP, an active business, began operations in 1942 as Mullins Tire and Rubber Company. The primary operation at that 

time was retreading used tires. In 1955, the business expanded from tires into molding rubber products. Beginning in the 

mid-1960s, the company focused on molding heavy duty truck/trailer suspension bushings, the product line that continues 

today. As part of MRP’s manufacturing process, VOCs were used to degrease certain metal parts.

 Site Contamination/Contaminants:

Ground water, soil and indoor air have been contaminated by VOCs, including tetrachloroethylene (PCE) and 

trichloroethylene (TCE).

 Potential Impacts on Surrounding Community/Environment: 

Ground water contamination has permeated the Grand Miami Buried Valley (GMBV) aquifer system. The site is located 

near the Dayton Mad River Well Field to the south, and the Dayton Miami Well Field to the west. Collectively, these well 

fields provide drinking water for approximately 400,000 residents.

 Response Activities (to date):

Over the last several years, the EPA has coordinated with the Ohio Environmental Protection Agency to investigate and 

respond to the contamination at the site. Results from these investigations indicate that indoor air at certain residences at the 

site have been contaminated by VOCs above health-based screening levels. Approximately 400 residences have been 

sampled for vapor intrusion (sub-slab or indoor air) by the EPA’s Superfund Removal Program and 91 residences were 

found to exceed the Ohio Department of Health screening level. EPA’s Removal Program has installed vapor abatement

mitigation systems at 90 homes to date. In January 2016, MRP agreed to conduct further evaluation and mitigation of 

residential vapor intrusion and conduct a source removal action. 

 Need for NPL Listing:

This site was referred to the EPA by the state due to the VOC plume, potential for contaminated drinking water, and vapor 

intrusion into residential homes. Although MRP and the EPA have recently agreed to actions to mitigate vapor intrusion 

impacts, without remediation of the contaminated ground water plume, the contamination may continue to spread. Other 

federal and state cleanup programs were evaluated, but are not viable at this time. The EPA received a letter of support for 

placing the site on the NPL from the state of Ohio. 

[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 ToxFAQs can be found on the Internet 

at http://www.atsdr.cdc.gov/toxfaqs/index.asp or by telephone at 1-888-42-ATSDR or 1-888-422-8737.