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Site Background Information Comfort Air, Inc • AGE-NC Project No 95-0141 Page 2 of 3 Contamination was detected in the deepest recovered sample from MW-6 at a depth of 65 feet bsg One soil sample collected from the pilot boring for MW-8 contained 1,2-DCA at a concentration of 15 mg/kg Soil samples from the pilot boring for MW-7 did not contain detectable concentrations of analytes of concern TPH-g, BTEX and 1,2-DCA were detected in the initial ground water samples collected from MW-6, MW-7 and MW-8 Details of the procedures and results of the monitoring well installation were presented inMonitoring Well Installation Report-Fourth Quarter ' 2000, dated 16 January 2001,prepared by AGE ' VERTICAL SITE ASSESSMENT On 10 October 2002, a soil boring (CPT-01) was advanced vertically on-site to a total depth of approximately 147 feet below surface grade (bsg), utilizing CPT technology to characterize the geological and hydrogeological framework and to identify potential contaminant-migration pathways beneath the site Based on the CPT lithologic sounding data,depth-discrete"grab"ground ' water samples and a soil sample were collected in a"twin"soil boring placed immediately adjacent to CPT-01, the water samples collected were assigned the boring designation of the initial CPT • boring (CPT-1) However, the twin boring could only achieve a maximum sampling depth of ' approximately 117 feet bsg before encountering refusal ' LABORATORY RESULTS OF SOIL/CPT"GRAB" GROUND WATER SAMPLES ' Only one soil sample (CPT1-1-85) was collected and submitted for analysis during the Fourth Quarter 2002 TPH-g, toluene, ethylbenzene, and total xylenes were detected in the sample at concentrations of 16 milhgrams/kilogram, 16 micrograms/kilogram (µg/kg), 5 1 gg/kg and ' 24 gg/kg, respectively, benzene was not detected in the soil sample A total of two"grab"ground water samples were collected from CPT-01,between 96 and 100 feet ' bsg and between 113 and 117 feet bsg TPH-g was detected in both samples at concentrations of 13,000 µg11 and 140,000 µg/1, respectively BTEX compounds were detected in both samples at concentrations as high as 4,600 µg/1 benzene, 16,000 µg/1 toluene, 2,100 µg/1 ethylbenzene and 11,000 µg/1 total xylenes(CPT-01-113-117) In addition, 1,2-DCA was detected in both samples at concentrations of 8 8µg11 and 250 gg/l,respectively and EDB was detected in sample CPT-01-113- 117 at a concentration of 90 µg/1 ' ADDITIONAL MONITORING WELL INSTALLATION/ABANDONMENT Between 14 October and 23 October 2002, soil borings were advanced at the site to Install Advanced GeoEnvironmental,Inc