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General Description of the Remediation System The remediation system for this site can be described in two parts, 1 ) the free product and ground water recovery system and 2 ) the reinjection system ( Figure 2, Figure 3 ) . Briefly, free product and ground water will be pumped from wells MW2, MW3 , MW6, and MW10 . The free product will be separated from the water with an oil/water separator, and the water will be filtered through activated carbon. As the water passes out of the treatment - system, the effluent headspace is monitored for explosive vapors. After treatment, the water flows from the system to the reinjection trench located on the northwest side of the site ( Figure 1 ) . Once the water reaches a predetermined level in the reinjection trench, any additional water will be discharged to the storm sewer. Description of the Free Product and Ground Water Recovery System Dissolved constituents and free product are to be recovered by pumping from existing wells MW2 , MW3 , MW6, and MW10 ( Figure 1 ) . Piping runs for MW3 , MW6, and MW10 will be along the eastern edge of the site. The piping for MW2 will run along the northern property boundary, and then follow in the same trench as piping for MW3, MW6, and MW10 . Each recovery pump requires three hoses, two for the pneumatic power system and one for recovered product/water. Each set of three hoses will be secondarily contained in an individual 4" PVC pipe duct. A discharge piping run from the treatment system to the reinjection trench will follow the same trench used for the water recovery piping (Figure 1 ) . Depending on the pumping rate and the percolation capacity of the injection trench, the absorption rate of the injection trench may be exceeded ( i. e. , a "full trench" ) . When this happens, the excess flow will be discharged to the storm sewer, located on the northwest corner of the site. The free product and ground water mixture will be recovered by Ejector Systems ' Total Fluids recovery pumps. The pumps are controlled pneumatically to decrease the possibility of sparking and explosion near hydrocarbon vapor. The air compressor and reservoir which supplies the pumping system will be situated outside the treatment system housing, but will be sheltered from rain . All electrical connections will be weather-proofed. Water from all four recovery wells will be collected into an oil/water separator ( Figure 4 ) . The actual well yields are unknown; sizing of this remediation system was based on the assumption that the wells will yield a total of 5 gpm. The oil/water separator size would normally be based on the fraction of free product to water and on flow. However, because these two parameters are unknown, the size of the separator has been assumed to be 250 gallons. A "tank full" high level float 5