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R ' 12 July 2001 AGE-NC Project No 98-0432 Page 2 of 10 The analytical data indicated a significant concentration of diesel dissolved in the ground water Results of the September 1998 investigation were reported in Preliminary Investigation and Evaluation Report (PIER), dated 09 March 1999,prepared by AGE 22 PREVIOUS SUBSURFACE INVESTIGATION The following is a summary of previous investigations at the site of the unauthorized release of fuel products to the subsurface • 03 December 1998 - six soil probe bonngs (B1 through B6) were advanced at the site to assess the lateral and vertical extent of petroleum-impacted soil and ground water(Figure 2) TPH-d,BTEX compounds and oxygenated fuel additives were not detected in any of the soil boring samples analyzed TPH-d and BTEX compounds were not detected in the two water samples analyzed from bonng BI and B6, but the oxygenated fuel additive MTBE was detected in both water samples analyzed at concentrations as high as 760 micrograms per liter (ug/l) No other fuel additives were detected in the analysis of the water samples • Results of the December 1998 investigation were reported in Preliminary Investigation and Evaluation Report (PIER) dated 09 March 1999 prepared by AGE • 12 and 13 January 2000- four ground water monitoring wells were installed on-site • 19 January 2000- the ground water wells on the site were monitored and sampled TPH-g, TPH-d and BTEX compounds were not detected in the ground water samples collected and analyzed from the site MTBE was detected in three ground water samples analyzed Concentrations of MTBE ranged from 200 ,ug/l to 9,800 µg11 in samples collected from monitoring wells MW-1,MW-2 and MW-3 Results of the January 2000 investigation were reported in Quarterly Report-First Quarter 2000 dated 07 March 2000 prepared by AGE • 12 October 2000-three soil probe borings (B7 through B9)were advanced at the site assess the vertical extent of MTBE-impacted soil and ground water(Figure 2) Probe bonngs were advanced in the area of the former USTs and in the areas north and east of the former diesel UST Probe boring locations are shown on Figure 2 Borings were advanced to a depth of 50 feet bsg Soil samples were collected at 5-foot intervals,beginning at a depth of 30 feet bsg MTBE was detected in two of the soil samples analyzed by EPA Method 8020 and was detected in four soil samples analyzed by EPA 8260 The detected MTBE concentrations ranged from 5 1 micrograms per kilogram(ug/kg) to 52,ug/kg The highest detected MTBE concentration was from soil collected at 30 feet bsg in the area of well MW-1, the location of highest dissolved MTBE MTBE was detected in the grab water sample from boring 138 collected from 50 feet bsg, at 29 ,ug/l by EPA Method 8260 and at 30,ug/l by EPA Method 8020 Results of the October 2000 investigation were reported in Additional Site Assessment Report -December 2000 dated 21 March 2001 prepared by AGE Advanced GeoEnvironmental,Inc.