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W ..✓ 06 May 2002 AGE-NC Project No. 02-0913 Page 3 of 4 FINDINGS TPH-g was detected in soil samples P3-15,P3-25 and P3-40 at concentrations of 1,200 milligrams per kilogram (mg/kg), 1,800 mg/kg and 6,300 mg/kg, respectively. Toluene, ethylbenzene and xylenes were detected in the same three samples at concentrations as high as 500 mg/kg,250 mg/kg and 1,600 mg/kg,respectively. MTBE was detected in samples P3-15 and P3-25 at concentrations of 10 mg/kg and 2.2 mg/kg, respectively, utilizing EPA Method 8021. However, MTBE was not detected above laboratory reporting limits utilizing EPA Method 8260. Benzene was not detected in the three analyzed samples from boring P-3. No target analytes were detected in the analyzed soil samples collected from probe borings P-1,P-2 and P-4. A copy of the laboratory report (CTEL Laboratory IDs 0203-150-1, 0203-150-4, 0203-150-7, 0203-150-9, 0203-150-12 and 0203-150-13) is included in Appendix A. DISCUSSION The detected concentrations of TPH-g and BTEX constituents indicate that a release of petroleum hydrocarbons occurred at the site. TPH-g and BTEX constituents increased with depth, indicating that the original release has migrated vertically to a depth of at least 30 feet bsg. MTBE was detected in two soil samples at concentrations of 2.2 mg/kg and 10 mg/kg utilizing EPA Method 8021; MTBE was not detected by EPA Method 8260B. It is unlikely that the detected concentrations represent an MTBE-impact to the subsurface; MTBE was not utilized as a fuel additive at the time the station was in operation. RECOMMENDATIONS AGE recommends preparation of a work plan to delineate the lateral and vertical extent of hydrocarbon-impacted soil and to determine if ground water has been impacted. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities. The findings were based mainly upon analytical results provided by an independent laboratory.Evaluation of the geologic conditions at the site for the purpose of this investigation was made from a limited number of available data Advanced GeoEnviron mental,Inc.