Miller Valley Road and Hillside Avenue | WQARF Site

Miller Valley Road and Hillside Avenue | Site Overview

Registry placement date: Dec. 12, 2016

Score: 40

County: Yavapai

Location: Prescott, approximately bounded to the north by the Merritt Avenue alignment, to the south by Miller Creek, to the east by Division Street, and to the west by Miller Creek and Valley Street

Contaminants of concern: Chlorinated solvents tetrachloroethene (PCE) and trichloroethene (TCE).

Action taken: Chlorinated solvents tetrachloroethene (PCE) and trichloroethene (TCE) were initially detected in the area in 2002 during a leaking underground storage tank (LUST) investigation on the southeast corner of Miller Valley Road and Hillside Avenue. The investigation ruled out the leaking tank as a source of the PCE and TCE.

The Preliminary Investigation (PI) found that soil gas and shallow groundwater contained PCE near the location of a former dry cleaners where a Fry’s Grocery store parking lot is today. During the PI, PCE was also reported in the groundwater in the vicinity of a current dry cleaners on the south side of Fair Street. In addition, PCE was detected above Aquifer Water Quality Standards (AWQS) in two private irrigation wells.

The Remedial Investigation was initiated in September 2017 after the site was listed on the WQARF registry. PCE and TCE were detected in shallow and deep groundwater above AWQS in the area of two former dry cleaners, one in the area of Fry’s parking lot, the other near the current Fry’s fuel center. No PCE was detected above AWQS in shallow groundwater at the current dry cleaners. The private irrigation wells were re-sampled, and PCE was found to have increased since the PI phase testing.

PCE was only detected at low levels in the soil gas at the site. Two buildings were evaluated for potential vapor intrusion, but no PCE was detected in indoor air.
The full extent of groundwater contamination is still being investigated.

Community involvement activities: A community involvement area has been established and a fact sheet was mailed to those located in and near the area. However, not enough applications were received to form a Community Advisory Board (CAB). If you are interested in serving on the CAB for this site, please contact the Community Involvement Coordinator.