Highway 260 and Main Street | Site History

2017-2019: ADEQ has begun a Remedial Investigation (RI) of the WQARF site to assess the extent of contamination and evaluate options to address the contamination.

2016: The Highway 260 and Main Street site was placed on the WQARF Registry on December 12, with an eligibility and evaluation score of 40 out of 120.

2015: An October sampling event found tetrachloroethylene (PCE), trichloroethene (TCE), and cis-1,2-dichloroethene (cis-1,2-DCA) in several wells across the Community Involvement Area (CIA). Only PCE was detected above the Aquifer Water Quality Standard (AWQS). PCE was detected above the AWQS in two private drinking water wells, at concentrations of 8.6 micrograms per liter (µg/L) and 20 µg/L. The sample with PCE at 8.6 µg/L was found in a mobile home park well supplying water to 14 residences.

2006-2007: ADEQ conducted a groundwater investigation to identify potential sources of PCE in the well at the Swanson RV Park. Groundwater and soil gas sampling identified two potential source areas: Cottonwood Cleaning & Bridal Boutique at the corner of Main Street and Aspen Street and Cottonwood Quality Dry Cleaning at the corner of Main Street and Camino Real. Field investigation found PCE at concentrations of up to 340 µg/L in groundwater and as high as 1,200 micrograms per cubic meter (µg/m3) in soil gas near Cottonwood Cleaning & Bridal Boutique. Similarly, PCE was found at concentrations of up to 170 µg/L in groundwater and as high as 450 µg/m3 in soil gas near Cottonwood Quality Dry Cleaning.

2005: In August, owners of the Swanson RV Park filed a complaint with ADEQ pertaining to PCE contamination in a drinking water well. Water in the well contained PCE at a concentration of 8.5 µg/L, which is above the AWQS of 5 µg/L.