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} 23 June 2001 AGE-NC Project No 99-0592 Page 3 of 4 I ' Far June 2001 The gradient map includes data from monitoring wells located at 3535 East Cherokee Road ' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES ' Petroleum hydrocarbons were detected in the ground water sample collected from monitoring well MW-1 TPH-g and TPH-d were detected at concentrations of 310 micrograms per liter (µg/l) and 280 µg/l, respectively Benzene, toluene and xylenes were detected at concentrations of 1 8 µg/l, 13 ' µg/l and 0 89 µg/1,respectively MTBE was detected at a concentration of 20 µg/1(by EPA Method 8260) in the sample from MW-1 None of the target analytes were detected in sample DW-1 collected from the active domestic well Analytical results for the ground water samples for the June 2001 monitoring event are summarized ' on Tables 2 and 3 The laboratory report (MAI Lab IDs 70404 and 70405), QA/QC and chain-of- custody are included in Appendix B 4.0. SUMMARY/CONCLUSIONS ' The following conclusions were drawn from the results of the site investigation and data collected from adjacent sites ' S Groundwater elevation at the site decreased approximately 3 7 feet since the 28 March 2001 monitoring event ' • The inferred local ground water flow direction is toward the northeast at a gradient of approximately 0 001 ft/ft Additional monitoring wells located at 3 53 5 East Cherokee Road were utilized to construct a ground water flow direction map for the subject site ' 9 TPH-g and TPH-d were detected in the groundwater sample from monitoring well MW-1 at concentrations of 310 µg/1 and 280 µg/l, respectively Both analyte concentrations were slightly higher than the concentrations detected during,the March 2001 sampling event MTBE was detected at a concentration of 20 µg/1 rn MW-1, a slight decrease compared to the March 2001 samplmg event The detected concentration of MTBE is above the Primary ' Maximum Containment Level of 13 µg/1 0 None of the target analytes were detected in the ground water sample collected from ' domestic well DW-1 Advanced GeaEnvironmental,Inc