In many instances, the user may need to conduct an investigation into certain environmental issues that are beyond the scope of E 1527 [1]. These may include radon, lead-based paint, lead in drinking water, asbestos, wetlands, sick buildings, compliance, and air quality issues. Users may realize some cost benefits if the environmental professional (EP) can combine the investigations. One site visit may be sufficient to cover requirements of the related investigations, and some of the other tasks may also be combined to increase the efficiency of the process.