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' . 09 March 1999 ` AGE-NC Project No: 98-0432 i Page 2 of 7 Soil samples were collected from the UST excavations. Soil samples were collected from beneath ' each end of the former gasoline UST locations and one sample was collected from beneath the center of the former diesel UST location. The soil sample depths ranged from thirteen to fifteen feet below surface grade (bsg). A total of four soil samples were collected from the former dispenser locations. Low concentrations ' of total petroleum hydrocarbons quantified as diesel were detected in soil samples from the diesel UST excavation and stockpiled soil. Table 1 presents analytical results of soil samples analyzed by. EPA method 8015 Modified and EPA method 8260 Modified. 2.2. EXCAVATION OF HYDROCARBON-IMPACTED SOIL On 1.5 September 1998, an additional 100 cubic yards'of significantly diesel-impacted soil was removed from the bottom of the diesel UST excavation. Soil was also excavated from the location'. ' of dispenser number three to a depth of five feet bsg and from the center of the common UST excavation (tank 3) at the south edge of the site to a depth of 15 feet bsg. Soil sam les were collected from the diesel UST over-excavation at depths of 18 feet bsg and one P P 8 soil sample was collected from the north edge of the over excavation ata depth of 20 feet bsg.A soil ' sample was collected from the center of the southern UST excavation at 15 feet bsg and one sail sample was collected from the-dispenser number three excavation at 5 feet bsg.- The analytical data indicated a significant concentration of diesel dissolved in the ground water. The remaining soil was impacted by.low to moderate concentrations of TPH-d. Table 1 presents analytical results of the over excavation soil samples. One grab water sample was collected from the northern edge of the diesel UST over-excavation. The sample contained TPH-d at high concentrations. Table 2 presents analytical results of grab water samples analyzed by EPA method 8015-Modified and EPA method 8260 Modified. ' 2.3. DISPOSAL OF HYDROCARBON-IMPACTED SOIL One hundred eighty-four tons of hydrocarbon-impacted soil were excavated from the former UST and former dispenser areas in September I998 and an additional five hundred thirty tons were excavated in January 1999,for a total removal of 714 tons of impacted soil. The excavated soil from the base of the diesel UST area was disposed at Forward Landfill on 29 September 1998 and soil_ ' excavated during the UST removals was disposed at Forward Landfill on 12 January 1999.Appendix A includes a summary of the areas excavated and disposition of the soil excavated from the former UST and dispenser system_excavations. Appendix A includes disposition records for the soil. Advanced GeoEnvironmental,Inc.