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31 March 2005 <br /> AGE-NC Project No 97-0249 <br /> Page 5 of 8 <br /> 3 14 Hydrologic Unit 4 <br /> Ground water elevation data collected from Hydrologic Unit 4(90 to 110 feet bsg)at both the Three <br /> B's Truck Plaza and the Flag City Chevron site's inferred a net ground water flow towards the east- <br /> southeast at an approximate hydraulic gradient of 0 001 ft/ft or less (6 feet per mile), ground water <br /> elevations from Hydrologic Unit 4 are depicted on Figure 7 <br /> 3 1 5 Hydrologic Unit 6 <br /> Ground water elevation data collected from Hydrologic Unit 6(130 to 150 feet bsg)at both the Three <br /> B's Truck Plaza and the Flag City Chevron site's inferred a net ground water flow towards the east- <br /> southeast at an approximate hydraulic gradient of 0 001 ft/ft or less (6 feet per mile), ground water <br /> elevations from Hydrologic Unit 6 are depicted on Figure 8 <br />' 3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES <br /> A total of forty ground water monitoring well samples were submitted to MAI for analysis, one <br /> domestic water well sample was submitted for analysis <br /> TPH-g was detected in ground water samples MW-1,MW-2, MW-3,MW-5,MW-6, MW-8 (A-C) <br /> and MW-l0A at a maximum concentration of 24,000 micrograms per liter (pg/1) in the sample <br />' collected from MW-3 The estimated extent of dissolved TPH-g in Hydrologic Unit I Is depicted on <br /> Figure 9 <br />' TPH-d was detected in ground water samples MW-1,MW-2, MW-3, MW-6, MW-8 (A and C)and <br /> MW-9 (A and B) at a maximum concentration of 2,700 µg/1 in the sample collected from MW-3 <br /> The laboratory reported the TPH-d sample chromatograms to either have significant gasoline range <br /> compounds, diesel range compounds, oil range compounds or unmodified gasoline/diesel The <br /> estimated extent of dissolved TPH-d In Hydrologic Unit I is depicted on Figure 10 <br /> Various BTEX constituents were detected in ground water samples MW-I, MW-2,MW-3, MW-5, <br />' MW-6, MW-7 (A-E), MW-8 (A-F) and MW-10 (A-F) at concentrations as high as 4,300 µg/I <br /> benzene, 430 µg/l toluene, 610 µg/1 ethylbenzene and 2,200 µg/l xylenes in the sample collected <br />' from MW-3 <br /> MTBE was detected by EPA Method 8260 in ground water samples MW-1,MW-2,MW-4, MW-5, <br /> MW-8 (A-C), MW-9 (A-B), MW-10(A-C) and MW-11 (A-C)at concentrations as high as 48 µg/l <br /> Advanced GeoEnnronmental,Inc <br />