Superfund Site Profile

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The Beckman Instruments (Porterville Plant) site covers about 500 acres in Porterville, California. The plant itself occupies 12 acres. The company has manufactured printed circuit boards and electronic instrument parts at the facility since 1968. Wastes generated from these operations included solvents, acid solutions and heavy metals. From 1974 until 1983, these wastes were disposed of in an evaporation pond on site. This pond is the most likely source of groundwater contamination in the area surrounding the Beckman facility. In addition to the pond, three other areas where wastes were dumped include the former enchant tank area, the ammonium persulfate and copper waste discharge area (known as the soil stain area), and the depression area. Liquids from the pond were first detected in 1978. Groundwater monitoring indicated the presence of elevated levels of volatile organic compounds (VOCs) and heavy metals. Following construction of the site’s long-term remedy, operation and maintenance activities and monitoring are ongoing.