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28 August 2012 <br />AGE-NC Project No. 02-0926 <br />Page 2 of 3 <br />Ground water was inferred to be flowing to the northeast at a calculated gradient of <br />0.003 foot per foot ft/ft. Figure 3 illustrates contoured ground water elevations as <br />measured on 13 July 2012. <br />Total petroleum hydrocarbons quantified as gasoline (TPH-g) were reported in well <br />MW-5 at a concentration of 300,000 micrograms per liter (pg/I). <br />Benzene, toluene, ethylbenzene, and total xylenes (BTEX) compounds were <br />reported in well MW-5 at concentrations of 9,400 pg/I, 28,000 pg/I, 2,800 pg/I, and <br />30,000 pg/I, respectively. <br />Fuel additives tertiary-amyl methyl ether (TAME) and 1,2-dibromoethane (EDB) <br />were reported in the sample collected from well MW-5 at concentrations of 66 pg/I <br />and 420 pg/I, respectively. <br />The fuel additive 1,2-dichloroethane (1,2-DCA) was reported in samples collected <br />from wells MW-3 and MW-5 and concentrations of 10 pg/I and 150 pg/I, <br />respectively. <br />Deep Monitoring Well MW-6 (screened 70 feet to 75 feet bsg) <br />Depth to ground water in well MW-6 was measured as 32.64 feet btoc and ground <br />water elevation was calculated as 14.11 feet below NAVD88 (Table 1). <br />TPH-g was reported at a concentration of 140 pg/I. <br />BTEX constituents toluene and total xylenes were reported at concentrations of 7.9 <br />pg/I and 13.1 pg/I, respectively. <br />No additional analytes were reported at or above laboratory detection limits in the ground <br />water samples analyzed. Analytical results of water samples collected in July 2012 are <br />summarized in Table 2. The estimated lateral distribution of dissolved concentrations is <br />depicted in Figure 4. The laboratory report (Cal Tech Environmental Laboratory Lab <br />Project. No. CT214-1207060), quality assurance/quality control report, and chain-of- <br />custody form are included in Appendix D. Depth to water and laboratory analytical data <br />were uploaded to the State GeoTracker database under confirmation numbers <br />1041905224. The EDF file will be uploaded upon receipt. <br />4.0. CONCLUSIONS <br />Based upon the results of the ground water monitoring, AGE presents the following <br />conclusions: <br />Advanced GeoEnvironmental, Inc.