Bruin Lagoon is located about 45 miles north of Pittsburgh in Bruin Borough, Butler County, PA. The commercial and main residential areas of Bruin Borough are located less than five blocks from the site and over 30 residences lie within 500 feet of Bruin Lagoon. Beginning in the 1930s, Bruin Oil Company, located on property adjacent to the site, used the lagoon for disposal of wastes resulting from the production of white oil (mineral oil). Disposal operations continued for more than 40 years. The first remedial action and an immediate emergency action was completed in 1984. EPA, upon completion of the emergency work, determined the need for a reevaluation of the site. Selected remedial actions include onsite stabilization/neutralization treatment of bedrock, dike reinforcement and capping the former lagoon area with a multi-layer cap as well as monitoring and maintenance of the site, cap and ground water. The estimated capital cost is $2,695,000 with annual O&M of $16,000.