Upper Patuxent Watershed

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Success Story

Helping Site Owner Deal with Legacy Pollution

The current owner of a property in northwestern Ohio is dealing with legacy industrial chemicals in soil and groundwater in a technically sound, cost-effective, and regulatory-compliant manner, with LimnoTech’s help.

Problem

A chemical called trichloroethylene, or TCE, was used to clean and degrease tubular metal parts at the industrial plant that once occupied the site. In spite of prevention measures, accidental releases of TCE to the environment occurred over the years. In the early 1990s, TCE was discovered in soil and groundwater beneath the plant and, by the end of the decade, the impacts had migrated off-site. The property owner had entered into a consent order with the state.

Approach

Working with the Ohio EPA on behalf of the property owner, LimnoTech completed the remedial investigation and feasibility study for the site, required under the consent order. LimnoTech also designed a number of cost-effective interim measures to address “hot spots” and prevent further migration of the impacts. When the groundwater impacts were believed to threaten the public water supply wells of the village, LimnoTech investigated alternative water supplies and discovered a previously unknown, deeper aquifer to provide water for the village.

Result

LimnoTech’s proactive efforts to address priority issues, concurrently with the RI/FS process and collaboratively with the regulatory agency, resulted in a lower cost final remedy for the site. By the time the state drafted their preferred plan for the site, it largely consisted of ongoing monitoring and maintenance, compared to multi-million-dollar alternatives evaluated in the feasibility study. LimnoTech’s discovery of the alternate water supply aquifer led the client to voluntarily construct new water supply wells for the village, so the public benefited as well.