Pinyon was engaged by the Arizona Department of Environmental Quality (ADEQ) to investigate chlorinated volatile organic compounds (CVOCs) detected in groundwater production wells near North 51st Avenue and West Camelback Road. The project focused on identifying probable contaminant source areas, delineating the groundwater plume, and evaluating potential risks to nearby residents and sensitive populations. Pinyon installed monitoring wells using sonic drilling methods, completed multiple rounds of groundwater sampling, and deployed more than 100 temporary soil-gas sampling points across public rights-of-way and private properties to define the nature and extent of contamination. Two rounds of indoor air sampling were also conducted, confirming that indoor air quality at sensitive locations was not significantly impacted.
To efficiently narrow down source properties and support data-driven decisions, Pinyon implemented a passive soil gas sampling program and utilized a mobile laboratory to deliver rapid analytical results during field activities. This real-time approach enabled ADEQ and Pinyon to continuously refine sampling locations, reduce investigation time and cost, and maintain a high level of technical rigor. The investigations identified two potential source areas with distinct CVOC signatures and led to the installation of multipurpose wells designed for ongoing groundwater monitoring, extraction, and soil vapor assessment. This integrated strategy provides ADEQ with a robust framework for managing risk, guiding remedial actions, and protecting public health and the environment.
