Targus was retained to conduct a soil vapor survey of a free standing retail building situated in a multi-tenant shopping center in Pheonix, Arizona. The building is occupied by a dry cleaners and a restaurant.
Prior site investigations identified the detectable presence of tetrachloroethene (PCE) released from operations of the cleaner tenant. Targus was authorized to perform additional sampling and analysis to verify results reported in prior investigations in an effort to confirm that conditions are protective and meet criteria to warrant issuance of Arizona Department of Environmental Quality (ADEQ) No Further Action (NFA) determination for soil and groundwater.
Targus’ subsurface assessment activities included the collection of vapor samples from below the cemented-slab floor through temporary vapor probes, followed by deep interior soil borings and exterior soil borings. Based on the results of initial sub-slab vapor analysis and subsequent additional subsurface vapor sampling, Targus undertook sampling of indoor air to document that vapor intrusion had not caused unacceptable vapor exposures. Air samples were collected from locations in the neighboring restaurant.
Upon granting of interior access, assessment is intended to be completed through interior, source-area, assessment with membrane interface probe confirmed by in-situ vapor and soil sampling. Particularly challenging aspects are completing vertical delineation to estimated depth of 75 feet using limited access drilling equipment at interior locations and delineating contamination along unmapped abandoned subsurface sewer lines.