Testing on gas stations and other facilities that store fuel above-ground or underground tanks should be conducted in or near the areas of the existing or former tank farm, dispenser islands, and piping.

Groundwater can be collected from existing permanent and/or temporary monitoring wells and analyzed for components associated with gasoline, diesel, and, if service facilities are or were present, for waste oil, solvents, and metals.

Soil can be collected and field-analyzed for hydrocarbons with an Organic Vapor Analyzer (OVA) and can be analyzed in a laboratory for components associated with gasoline, diesel, waste oil, solvents, and metals.