Roux Associates was retained by an electric power company to conduct environmental due diligence under the All Appropriate Inquiry Rules for a potential substation location near Andrews Air Force Base in Marlboro, Maryland.  The property consisted of an irregularly shaped agglomerate of five parcels totaling approximately 20 acres of land.  The initial phase of the investigation consisted of site historical review, inspection of the property and surrounding land uses, and a review of environmental documentation at the local and county agencies.  The results of the investigation identified several nearby properties of potential environmental concern, including the Air Force Base; a former repair garage and several residences that formerly occupied the properties. 

Follow-up investigations consisted of a geophysical survey in an attempt to locate the former residences and associated heating oil tanks, soil and groundwater sampling to assess the potential for environmental impairment.  Concurrent with the investigation activities, Roux Associates collected samples of the soil for waste characterization to evaluate potential disposal options for the soil excavated during eventual site development.    The results indicated minor groundwater impacts from the former repair garage on the adjacent property.  The geophysical investigation located the former foundations of several buildings.  The waste characterization sampling indicated the presence of petroleum-related substances, but at concentrations below regulatory limits.  The client used this information to design the site development, including the removal of the former building foundations and consideration of re-using the excavated soil for beneficial purposes.