Boart Longyear diamond drilling firm; Brainard-Kilman, a maker of civil engineering devices, such as well monitoring and test equipment; and ChemGrout a mfg of cement grouting equipment. Longyear acquired Slope Indicator Company, the nation's largest producer of geotechnical instruments, and Northern Air Supply in 1988, followed by the Campbell Pacific Division in 1989 and WTD Environmental Drilling in 1990. Then in 1994, North Star Drilling Company, specializing in sonic drilling was acquired. On January 2, 1995, Boart International and the Longyear Company officially merged into a single company and changed its name to Boart Longyear Limited. At this point the two companies
Solid Waste Disposal Act of 1965 and Solid Waste Amendment (HSWA). After the industrial revolution lead to increases in municipal waste, local and regional governments and private individuals developed many diverse, and frequently unsafe or unsanitary, disposal technologies for disposal of this waste. The most frequent disposal method used was open dumps and burning of trash. As the Germ Theory of Disease developed in the late 19th and early 20th century, this led to increased attention of waste disposal as a public health crisis in the United States. Due to increasing demand for better waste management during the 1960s, the United States passed SWDA in 1965.