ABSTRACT
Construction of a trench and sump recovery system inside a building is a complicated matter. Excavation equipment gives off exhaust fumes, and excavated material gives off gasoline fumes in a confined space. Many major businesses have underground storage tanks for storing liquids ranging in character from gasoline to solvents and spent pickling liquors. In southern Michigan, a large factory had an underground gasoline storage tank for the use of intra-plant vehicles. Upon reduction of the data acquired in the hydrogeologic investigation, it was determined that the product was confined within the building foundation in the underlying medium to fine grained gray silty sand. Initially, two possible integrated remedial alternatives were considered. These were biodegradation techniques and physical removal and treatment. A series of five pumping wells was installed in the plant; four at the leading edge of the plume in a line-sink configuration, and one in the location of the thickest phased product concentration.
