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y <br /> ' . 21 March 2001 <br /> AGE-NC Project No. 98-0432 <br /> Page 4 of 5 <br /> 3.0: FINDINGS <br /> The soil lithology descriptions were determined from soil samples collected and the contaminant <br /> ' impact to soil and ground water was assessed from the laboratory data. <br /> 3.L HYDROCARBON-IMPACTED SOIL <br /> A total of eleven soil samples were analyzed for TPH-g,TPH-d,BTEX, and fuel additives including <br /> ' MTBE in'accordance with the techniques previously presented. <br /> • TPH-g, TPH-d were not detected in the soil samples analyzed. <br /> ' 6 Xylene was detected at 0.014 milligram per kilogram(mg/kg) in soil sample B7-50. . <br /> • The oxygenated fuel additive MTBE was detected in two of the soil samples analyzed by- <br /> EPA <br /> yEPA Method 8020 and was detected in four soil samples analyzed by EPA 8260. <br /> • The detected MTBE concentrations ranged from 5.1 micrograms per kilogram (,ug/kg) to 52 <br /> µglkg. The highest detected MTBE concentration was from soil collected at 30 feet-bsg.in <br /> f the area of well MW-1, the location of,highest dissolved MTBE. <br /> ' Laboratory results of soil samples analyzed for petroleum hydrocarbons and fuel additives are <br /> summarized in Tables 1 and 2. The laboratory reports(MAI Laboratory ID 50369 to 50379), quality <br /> ' assurance and quality control (QA/QC) reports and chains-of-custody are included in Appendix B. <br /> 1 3.2. HYDROCARBON-IMPACTED GROUND WATER <br /> ' The grab ground water samples were analyzed for TPH-g, TPH-d, BTEX, and fuel additives in J <br /> accordance with techniques previously presented. <br /> ' & TPH-g, TPH-d and BTEX compounds were not detected in the grab ground water sample's. <br /> • MTBE was detected in one of the ground water samples analyzed. MTBE was'detected in <br /> grab water sample from boring B8 collected from 50 feet bsg at 29 micrograms per liter <br /> ' (ug/l) by EPA Method 8260 and at 30µg11 by EPA Method 8020. <br /> ' Analytical,results,from ground water samples are summarized in Table 3. The laboratory reports <br /> (MAI Laboratory ID 50366 to 50368), QA/QC reports and chain-of-custody forms are included in <br /> Appendix B. <br />