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%b/ FOX ENVIRONMENTAL SERVICES, INC. APPENDIX A 8015 West Cliff Drive• Knoxvil e.TN 37919• (61 5) 690-1996 HYDROCARBON RECOVERY SYSTEM PRINCIPAL OF OPERATION Description: The hydrocarbon recovery system consists of a product recovery pump, a groundwater depression pump, (if required), two above ground 550 gallon skid tanks, one 550 gallon recovered product storage tank, a reservoir, an air stripping tower and an optional volitization bed. Operation: This system can be used with either a single recovery pump or a recovery pump and a depression pump combination, depending on site specific conditions. Upon start up, the two above ground tanks are charged with clean water to create the product/water separation system, and thereafter, the fluid level is maintained automatically by means of a stand pipe located on the water tank. Recovered product is pumped to the separation tank, which is equipped with a product/water discriminator. When a product thickness of 1/2 inch accumulates on the water surface of the separator tank, the product/water discriminator activates a solenoid valve, allowing the recovered product to gravity flow into the recovered product storage tank. When a mixture of product and water is pumped into the separator tank, and separation takes place, the water then flows from the bottom of the separator tank to the top of the water tank. Water from the bottom of the water tank flows through a stand pipe into the water feed tank, which supplies the water pump. The water pump is attached, by means of piping, to the spray ring within the air stripping tower, and a flow meter/totalizer is located between the pump and the spray ring. The spray ring is equipped with spray nozzles that are aimed vertically. The number of nozzles may vary depending on the pumping rate, and the pumping rate can be varied from two gallons per minute to 15 gallons per minute. Water sprayed from the nozzles pass through two atomization screens to further break up the droplets, which are subjected to a constant updraft of air that is created by a low pressure high velocity blower. An absorber pack is placed near the top of the tower to reduce misting from the top of the tower and pro- duce a more constant pressure on the atomization screens. The purpose of the air stripping tower is to change the water from the separator system into a fine mist, exposing the mist to a constant air flow, allowing any soluable hydrocarbons to volatize off and render the effluent from the air stripping tower suitable for approved discharge, Depending on location, the clean discharge water from the recovery system can be either fed into a sanitary sewer, storm sewer, or drainage ditch, provided that the necessary permits or authorization is obtained prior to such discharge.