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switch will cut power to the ground water pumps when the fuel reservoir becomes full (Figure 5 ) . (The recovered fuel reservoir will be emptied manually; startup monitoring will determine an appropriately sized fuel reservoir. ) A supplemental diaphragm pump will force the water from the separator to the activated carbon units ( Figure 4 ) . Air should not be pumped through the carbon because channeling of subsequent water will reduce the carbon ' s filtration-capacity. To prevent this, a low level hi/lo switch will cut power to the diaphragm pump if the water level in the separator ' s water side is too low ( Figure 5 ) . The activated carbon units are comprised of approximately 160 pounds of carbon in a metal shell the size of a 55 gallon drum. There will be two units connected in series; breakthrough will be detected by sampling ports located before and after the second carbon drum ( Figure 4 ) . A third carbon unit will be onsite to be exchanged with the spent unit. All connections will be quick connect Kamlock fittings on flexible hosing. The headspace of the filtered effluent will be monitored for explosive vapors prior to discharge to the reinjection trench, and ultimate discharge to the storm sewer. An enclosed drum will act as a holding tank, where a detector for monitoring percent of the Lower Explosive Limit ( LEL ) will be mounted ( Figure 6 ) . The detector will trip a relay in the LEL meter, which will shut off power to the air compressor if the headspace above the effluent reaches a preset level . The housing for the treatment system will be a temporary metal storage shed. The air compressor and the electrical circuit breaker board will be located outside the enclosure. The concrete pad for the temporary enclosure will be poured to also act as the secondary containment for the treatment system. The largest volume component of the system will be the oil/water separator. The required containment capacity is 150% of the largest container which is 250 gallons. Therefore, 375 gallons or 50 cubic feet of storage capacity is required. A secondary containment measuring 10 ft . by 10 ft . by 0 . 5 ft would suffice. However, in order to accomodate the control panel, the separator, the three carbon drums, and the headspace monitoring drum, a slightly large area will be constructed. A second "tank full" high level float switch has been designed to sit in the secondary containment. Should a piping or fitting break occur, water would fill the secondary containment until the high level float switch was tripped, then the ground water pumps would shut down . 6