RETURN TO USE INITIATIVE 2010 Demonstration Project JASCO CHEMICAL CORPORATION: Mountain View, California THE SITE: The Jasco Chemical Corporation Superfund Site (the Site) is a 2.05 acre property in Mountain View, California. Jasco Chemical Corporation repackaged and formulated chemical products at the property from 1976 until December 1995. Bulk solvents used at the Site were received by tankers and stored in eight underground storage tanks. In 1983, elevated levels of volatile organic compounds (VOCs) were detected in soils from a swale area located behind the facility and in the shallow ground water. Past waste disposal practices and possibly leakage from an underground storage tank and surface water may have contributed to soil and ground water contamination. The City of Mountain View has a population of approximately 70,000 people. The only surface water body within one mile of the Site is Permanente Creek. Approximately 330,000 people live within three miles of the Site, and depend on area ground water for their drinking water. In 1987, the City of Mountain View shut down one well near the Site to determine whether the company's operations were affecting the well. In 1988, after investigations indicated that contamination had not migrated into the ground water near this well, it was placed back into operation. BARRIER: A tetrachloroethylene (PCE) plume that originated off site raised potential redevelopment concerns. SOLUTION: Site owners voluntarily implemented land use restrictions to address potential concerns. PICTURED: Aerial view of the vacant site, (source: EPA) BEFORE: The protectiveness of the Site's remedy in certain redevelopment scenarios was uncertain due to the identification of the PCE ground water plume. AFTER: Site that is ready for appropriate use, with deed restrictions in place to address vapor intrusion and other concerns from the PCE plume. The Site's remedy included excavation and on-site treatment of some contaminated soil and use of a soil vapor extraction system for additional soil and ground water remediation. Operation and maintenance activities for the Site's remedy have been ongoing since 2002, when construction of the Site's remedy was completed. Ground water is sampled annually. THE OPPORTUNITY: The Site is centrally located in an area with high demand for undeveloped land and it was anticipated that the Site's remedy would be able to support unrestricted land uses. BARRIER: After the Site's ROD was finalized, a tetrachloroethylene (PCE) plume was discovered. EPA Region 9 and the California Environmental Protection Agency concluded that the PCE plume did not result from the Jasco Chemical Corporation's operations and that the source was off site. However, United States Environmental Protection Superfund Redevelopment Initiative 1—J § m Agency kAgency Updated: August 2010 1 ------- since the PCE plume impacted site ground water and would not be remediated by the Site's planned remedy, restrictions on ground water use and subsurface activities needed to be put in place until the PCE plume could be addressed. JEPA issued an Explanation of Significant Differences (ESD) for the Site's remedy in September 2002. The ESD required implementation of a deed restriction for the site property to address potential vapor intrusion concerns and ensure that area ground water would not be impacted during future construction activities. THE SOLUTION: The Site owners recorded a Covenant and Environmental Restriction on the Site property. The legal instrument included all of the restrictions from the Site decision documents deemed necessary by EPA to ensure the protectiveness of the Site's remedy and named EPA as a third-party beneficiary which allows EPA to enforce the restrictions. THE SITE NOW: The Site is available for reuse and can support residential or commercial land uses, subject to the Site's Covenant and Environmental Restriction. All potential uncertainties regarding the Site's cleanup and redevelopment have been addressed. FORMORE INFORMATION, PLEASE CONTACT: LilyTavassoli, Remedial Project Manager, at (415) 972-3146 or tavassoli.lilv@epa.aov: or Gary Riley, Region 9 Superfund Redevelopment Coordinator, at (415) 972-3003 or rilev.aarv@epa.aov. United States Environmental Protection i Agency Superfund Redevelopment Initiative Updated: August 2010 2 ------- |