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ATC SITE SAFETY PLAN <br /> FACILITY BACKGROUND <br /> Four drywells are located on the southern portion of the facility are were formerly used to <br /> discharge surface water for site drainage. A soil sample has been collected from the bottom <br /> of each drywell and the samples contained low concentrations of toluene and total <br /> petroleum hydrocarbons as gasoline (TPHg). <br /> WORK PLAN <br /> Task One: <br /> Supervise the destruction of the four drywells. The gravel in each drywell will be <br /> removed utilizing a combination of a vacuum truck and a bucket auger rig. Once <br /> the gravel has been removed, the center pipe will be removed from each well and the <br /> drywells will be drilled out utilizing the bucket auger rig. Additional soil will be <br /> removed to 2 feet below the original depth of the drywell One sample will be <br /> collected from two feet below the bottom of each drywell. In addition, the one <br /> sample will be collected from the drill cuttings from each well. The samples will be <br /> analyzed for volatile organic compounds (VOCs) by EPA Method 8260, semi- <br /> volatile organic compounds by EPA Method 8270, TPHg and total petroleum <br /> hydrocarbons as diesel (TPHd) by EPA Method 8015, total recoverable oil and <br /> grease by EPA Method 418.1, and CAM 17 Metals. Once analytical results have <br /> been received, the drywells will be backfilled with a sand slurry from the bottom to <br /> 8 feet bgs. The drywells will then be capped with a cement slurry from 8 feet bgs to <br /> the surface. <br /> PAGE 4 <br />