Client: Gas Station Location: Gresham, OR Timeline: March – October 2011 Based on Phase I site investigation recommendations, during a refinancing of the gas station property, the lender requested the property owner to collect subsurface soil and groundwater samples in the area around the tank nest, dispenser area and piping. Concerns were also related to potential contamination migrating from the upgradient, adjacent historic wrecking yard. This assessment included the advancement of several shallow soil borings to collect soil and groundwater samples and to collect soil-gas samples inside the building to assess the level of volatilization to indoor air. Alpha prepared a conceputual site model, performed a groundwater assessment in the area, and reviewed chemical data. In spite of being a currently operated gas station, our scope of work was able to be conducted with minimal impact to business, which functioned normally during our on-site investigation. All constituents of concern were compared to the DEQ risk-based concentrations and results indicate values are below the applicable RBCs for all exposure pathways. The analytical results for the soil-gas showed detections for volatile organic compounds, which were concluded to be below RBCs for vapor intrusion.