north sanitary landfill

200 VALLEYCREST DRIVE

The North Sanitary Landfill (NSL) site occupies almost 102 acres in Dayton, Ohio. More than half of those acres were used for landfilling industrial and municipal wastes into unlined former gravel pits which intersected the water table. Five disposal areas have been identified within the NSL site, one of which is a designated drum disposal area. The NSL site sits atop and within a federally designated sole-source aquifer composed of highly transmissive sands and gravels. The site is situated in between and in close proximity to the City of Dayton's two major municipal well fields. These well fields supply over 430,000 people in the greater Dayton metropolitan area with drinking water. The NSL site is located in a mixed residential/industrial setting and is surrounded on all sides by residential and industrial land use. Several residential drinking water wells in the area have become contaminated with organic substances believed to be related to the NSL site. It is believed that at this time all affected residents have been connected to the municipal water supply. Industrial wastes disposed at the NSL site, some of which were disposed beneath the water table, include used oils, solvents, scrap paint, lampblack, electrical transformers, brake grindings containing asbestos, and sewage. Numerous fires have occurred at the site, both during active disposal operations and after disposal operations had ceased. The most recent fire occurred in September of 1996, when the city of Dayton Fire Department, the Regional Hazmat Team, and Ohio Environmental Protection Agency (OEPA) Emergency Response personnel were called in to mitigate an underground fire in an area of the site known to contained drummed industrial wastes. Site Responsibility The responsible parties conducted the RI/FS, with OEPA as the designated lead agency for RI/FS oversight through a cooperative agreement with the U.S. EPA. U.S. EPA was the lead for the drum removal and soil treatment activities. U.S. EPA completed a Record of Decision in August 2013 and is completing a referral to the Department of Justice to begin negotiations to implement the design and construction of the remedy. It is anticipated that negotiations will commence in 2014.

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• Fairchild Air Force Base (4 Waste Areas) (Spokane, WA)
• Mackenzie Chemical Works (Central Islip, NY)
• Evor Phillips Leasing (Old Bridge Township, NJ)

• Norfolk Naval Base (sewells Point Naval Complex) (Norfolk, VA)
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• Reich Farms (Pleasant Plains, NJ)
• Zanesville Well Field (Zanesville, OH)