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41 4 <br /> 10 April 2001 <br /> AGE-NC Project No 99-0592 <br /> Page 3 of 4 <br />' to be northeasterly at a gradient of approximately 0 001 ft/ft Figure 3 depicts the contours for March <br /> 2001 The gradient neap includes data from monitoring wells located at 3535 East Cherokee Road <br /> I <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' Petroleum hydrocarbons were detected in the ground water sample collected from monitoring well <br /> MW-1, located within the former UST excavation TPH-g and TPH-d were detected at <br />' concentrations of 420 micrograms per liter(µg/1) and 270 gg/l, respectively Benzene and toluene <br /> were detected at concentrations of 1 8 µg/1 and 0 70 gg/l, respectively MTBE was detected at a <br /> concentration of 5 1 µg/l (by EPA Method 8260) in the sample from MW-1 None of the target <br />' analytes were detected in sample DW-1 collected from the active domestic well <br /> Analytical results for the ground water samples for the March 2001 monitoring event are <br /> summarized on Tables 2 and 3 The laboratory report (MAI Laboratory ID 64150 and 64151), <br /> QA/QC and chain-of-custody are included in Appendix B <br /> 4.0. SUMMARY/CONCLUSIONS <br /> The following conclusions were drawn from the results of the site investigation and data collected <br /> from adjacent sites <br /> 0 Ground water elevation at the site decreased approximately 1 5 feet since the 20 December <br /> 2000 monitoring event <br /> IW The inferred local ground water flow direction is toward the northeast at a gradient of <br /> approximately 0 001 ft/ft Additional monitoring wells located at 3 53 5 East Cherokee Road <br /> were utilized to construct a ground water flow direction map for the subject site <br /> a TPH-g and TPH d were detected in the ground water sample from monitoring well MW-1 <br /> at concentrations of 370 µg/1 and 270 µg/l, respectively Both analyte concentrations were <br /> slightly higher than the concentration detected during the December'2000 sampling event <br /> MTBE was detected at a concentration of S 1 µg/1 in MW-1, a slight decrease compared to <br /> the December 2000 sampling event <br /> I0 None of the target analytes were detected in the ground water sample collected from <br /> domestic well DW-1 <br /> I <br /> Advanced GeoEnvironmentai,Ire <br />