ADEQ has made a determination that no further remedial action is necessary at the Tyson Wash Water Quality Assurance Revolving Fund (WQARF) Site in Phoenix, Arizona (“Site”) and has removed the Site from the WQARF Registry.1 ADEQ has prepared a record of decision (ROD) closeout report which contains the basis for why continued implementation of the ROD is no longer necessary.
The Tyson Wash WQARF site consisted of a plume located in Quartzsite, Arizona. The plume boundaries were defined by the areal extent of the former tetrachloroethene (PCE) groundwater plume, which was bounded by Sunset Street to the north, Main Street (Business I-10) to the south, Central Boulevard (SR-95) to the east and Oregon Avenue to the west, and with the known groundwater contamination existing northwest of the intersection of State Highway 95 and Business Route I-10. The Site boundaries provide the estimated extent of previously known contamination where concentrations of PCE in the groundwater were greater than the Aquifer Water Quality Standard (AWQS) of 5 micrograms per Liter (µg/L). The Site was added to the WQARF Registry in December, 1998.
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1Pursuant to Arizona Revised Statutes (ARS) § 49-287.01(K)