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1 Maintenance shop Ditch. A summary of PCB, Pb, and gasoline/diesel <br /> concentrations in the maintenance shop ditch is shown in Table 7. <br /> ' PCB was "not detected" in the shallow (0 to 2.5 feet) soil samples <br /> in the maintenance shop ditch. Detection limit for PCB was 0.1 ppm. <br /> ' Moderate concentrations of Pb (approximately 100 ppm) were detected <br /> ' in the shallow (1 to 2.5 foot) soil samples at locations P6 and P7. <br /> However, the Pb concentration diminished to 8.4 ppm at P6 in the 2.5 <br /> ' to 3.5 foot soil sample. In addition, a high concentration of <br /> diesel fuel (approximately 1000 ppm) was detected in the shallow <br /> (1.5 to 2.5 feet) soil sample at location P6 . An underground diesel <br /> ' fuel tank is located near P7. This tank was precision tested by <br /> Integrity Tank Testing Systems, Inc. of Stockton, California on <br /> ' July 10, 1985. It was determined that the diesel tank system (tank <br /> and piping) was leaking at a rate greater than NFPA 329 guidelines <br /> ' (i.e. , 0.05 gph) . However, the underground tank itself was later <br /> tested to be "tight" (i.e. , loss less than 0.05 gph) . It appears <br /> that the high concentration of diesel may be the result of a leak in <br /> the vent, fill, or suction line of the tank. <br /> A surface (0 to 0.5 foot) soil sample was collected where the <br /> maintenance shop ditch discharges into the parking lot located on <br /> the south side of Yankee Stadium. A concentration of 190 ppm of Pb <br /> was detected. <br /> 1 <br /> CONCLUSIONS AND FUTURE ACTIONS <br /> A summary of the Phase 1 results and conclusions is presented below: <br /> ' • PCB was "not detected" in the shallow (0 to 2.5 foot) soil <br /> ' samples of the truck parking area and maintenance shop ditch. <br /> Therefore, it does not appear that PCB contamination is a <br /> concern in these areas. <br /> t <br /> - 7 <br /> 2611F <br />