West Central Phoenix — West Grand Avenue | Delisted WQARF Site

Registry placement date: April 21, 1998

Score: 17

County: Maricopa

Location: Phoenix, approximately bounded by Osborn Road to the north, Earll Drive to the south, 33rd Avenue to the east and 35th Avenue to the west

Contaminant of concern: Trichloroethene (TCE)  

Action taken: Early Response Actions (ERAs) completed at the site, including underground storage tank removal, soil excavation and the operation of a soil vapor extraction system, have addressed contamination in vadose zone soils. TCE is the only contaminant that was found at levels above its Aquifer Water Quality Standard (AQWS) of 5 micrograms per liter (µg/L) in the groundwater at the site. Following completion of the ERAs, TCE concentrations in groundwater steadily decreased to below the AWQS of 5 µg/L.

Based on the results of two groundwater sampling events in January 2016 and April 2016, the TCE concentrations remained less than the AWQS of 5 µg/L.  Following determination that TCE concentrations continued to be less than the AWQS, all wells associated with the site were abandoned in accordance with the applicable Arizona Department of Water Resources requirements.

Status: On May 29, 2017, ADEQ removed this site from the WQARF registry, as regulatory cleanup levels have been achieved and no further action will take place.

Community Advisory Board (CAB): Established and meets regularly