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S <br /> ATC SrrE SAFETY PLAN <br /> FACILITY BACKGROUND <br /> In December 1990, one 500-gallon unleaded gasoline underground storage tank (UST) and <br /> all associated piping and dispensing equipment was removed and disposed of. Laboratory <br /> analysis of a soil sample collected from beneath the former UST location indicated the <br /> presence of detectable concentrations total petroleum hydrocarbons. After the tank was <br /> removed, the area of the former tank was backfilled. <br /> On August 14 and 15, 1997, four soil borings to 25 feet bgs were advanced. The soil <br /> borings were advanced using a truck mounted Geoprobe® narrow diameter rig employing <br /> direct push technology. Soil samples were submitted for analysis and samples from one <br /> boring, SB-1, contained detectable concentrations of toluene, ethylbenzene, and xylenes. A <br /> grab groundwater sample was also collected from boring SB-1 and contained detectable <br /> concentrations of TPHg and toluene, ethylbenzene, and xylenes. The samples from borings <br /> SB-2, SB-3, and SB-4 did not contain detectable concentrations of petroleum <br /> hydrocarbons. <br /> WORK PLAN <br /> Task One: <br /> One soil boring will be advanced in the location of the former tank pit. The soil <br /> boring will be advanced employing hollow stem auger to a depth of approximately <br /> 35 feet bgs. A field geologist will be present to log all soil samples. Each soil sample <br /> will be field screened with a Photoionization Detection (PID) meter or similar <br /> instrument and at least three samples from the boring, based on field observations <br /> (i.e. odor, discoloration, PID readings), will be placed in a cooler with ice and <br /> submitted for laboratory analysis. Samples will be analyzed for BTEX (EPA Method <br /> 8020), TPHg (EPA Method 8015 Modified), and oxygenate fuel additives (EPA <br /> Method 8260). <br /> Task Two: <br /> Supervise the completion of the soil boring into a groundwater monitoring well to a <br /> depth of approximately 35 feet. One groundwater sample will be collected from the <br /> well after its development. Samples will be analyzed for BTEX, TPHg, and <br /> oxygenate fuel additives. <br /> PAGE4 <br />