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90343TEXT CON-7 • contamination does, however, extend to the water table and is probably F consistent throughout the containment area. A small amount of free oil is floating on the water table but this too, appears to be restricted to the containment area. Based on the results of the water sample analyses, contamination of the groundwater itself by petroleum hydrocarbons is not thought to be of concern. In light of the results of this and the previous spill investigation and the fact that much of the contamination at the tank farm appears to have been present for some time, the migration potential of the oil through 1 the soil and along the water table appears to be low. The viscosity of the oil and the gradual slope of the gradient across the site may be inhibiting migration along the water table. i RECOMMENDATIONS i The recommendations for remediation of contamination resulting from the spill at the straw oil tank farm are concerned primarily with the contaminated soil and free oil floating on the water table. Because the i water sample analysis was negative, no actions are recommended regarding 9 the groundwater itself. Recovery of the free oil from MW-14 should be conducted and can be accomplished in the same manner as for the other spill . The suction line from a small , air operated double diaphragm pump can be placed down the well to both depress the water table slightly and recover the oil . The recovered liquids are pumped through the oil/water separator with the water then going to the onsite water treatment plant and the oil to a recycler. We understand that this is already being implemented. i Remediation of the contaminated soil below the tank farm would most effectively and efficiently be achieved by excavation and spreading for evaporation as was done during the initial spill response. The excavation should extend vertically to the lower limit of the normal water table fluctuations (approximately 12 ft below grade) . While the lateral limits