The Motorola 52nd Street site is located in the City of Phoenix, Maricopa County, Arizona. The site is bounded by the Phoenix Military Reservation and mixed residential and commercial neighborhoods. The site is currently owned by Motorola, Inc., which operates a manufacturing facility at the site using solvents for various manufacturing processes. In January 1983, Motorola tested some underground storage tanks used to store virgin solvents for leaks and determined that a 5,000-gallon tank containing TCA was leaking. Subsequently investigation indicated soil and ground water contamination on the plant site and ground water contamination offsite to the west. Motorola initiated an onsite ground water treatment program in 1986, a Pilot Treatment Plant (PTP). The PTP is still in operation. The selected remedy requires partial cleanup of onsite and offsite organic solvents contamination in the soil and alluvium ground water. A subsequent remedial action will address cleanup of all onsite and offsite contamination in the soil, alluvium ground water, and the bedrock underlying the alluvium. The primary contaminant of concern affecting the soil and ground water is TCA.

"September 1988." EPA/ROD/R09-88/024. PB89-204861. Additional title: Superfund record of decision (EPA Region 9): Motorola (52nd Street Plant), Phoenix, Arizona (first remedial action), September 1988.