Laserfiche WebLink
07 September 2005 <br /> . AGE-NC Project No 97-0249 <br /> Page 5 of 8 <br /> 3 14 Hydrogeologic Unit 6 <br /> Ground water elevation data collected in the Hydrogeologic Unit 6 (130 to 150 feet bsg) inferred a <br /> net ground water flow direction at the Flag City Chevron towards the southeast at a hydraulic <br /> gradient of 0 001 ft/ft or less The ground water gradient at the Three B's Truck Plaza Inferred a net <br /> ground water flow direction towards the east at a hydraulic gradient of 0 001 ft/ft or less(Figure 7) <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- was detected in round water samples MW-1, MW-2, MW-3, MW-5, MW-6, MW-7A, <br /> g g <br /> MW-8(A-C and E)and MW-10A at a maximum concentration of 47,000 micrograms per liter(µg11) <br />' in the sample collected from MW-3 The estimated extent of dissolved TPH-g in Hydrologic Unit 1 <br /> Is depicted on Figure 8 <br /> 10 TPH-d was detected in ground water samples MW-1, MW-2, MW-3, MW-6 and MW-8A at a <br /> maximum concentration of 5,000 pg/1 in the sample collected from MW-3 The laboratory reported <br />' the TPH-d sample chromatograms to either have significant gasoline range compounds,diesel range <br /> compounds,oil range compounds or unmodified gasoline/diesel The estimated extent of dissolved <br /> TPH-d in Hydrologic Unit 1 is depicted on Figure 9 <br /> Various BTEX constituents were detected in ground water samples MW-1,MW-2, MW-3,MW-5, <br /> MW-6, MW-7 (A-E), MW-8 (A-F), MW-9 (A and B) and MW-10 (A-F) at concentrations as high <br /> as 7,100 µg/l benzene, 840 pg/l toluene, 1,500 µg/l ethylbenzene and 5,200 [ig/l xylenes in the <br /> sample collected from MW-3 <br />' MTBE was detected by EPA Method 8260 in ground water samples MW-1,MW-4,MW-5,MW-8C, <br /> MW-9 (A-B), MW-10 (A-C) and MW-11 (B-C) at concentrations as high as 28 gg/l (MW-1) The <br /> estimated extent of dissolved MTBE in Hydrologic Units 1 and 2 are depicted on Figures 10 and 11, <br />' respectively <br /> TBA was detected in ground water samples MW-1,MW-4 and MW-9A at maximum concentrations <br />' of 67 µg/1 from well MW-1, 1,2-DCA was detected in ground water sample MW-10A at a <br /> concentration of 3 4 µg/l <br /> tNo other fuel components were detected in the ground water samples Previous and current analytical <br /> results of ground water monitoring well samples are summarized in Tables 3 and 4,analytical results <br />' Advanced CcoEnvironmental,Inc <br /> 1 <br />