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15 January 2006 <br /> • ' <br /> AGE-NC'Project No. 95-0106 <br /> Page 2 of 3. - <br /> certified analytical laboratory,and analyzed for: <br /> • Total petroleum hydrocarbons quantified as "gasoline (TPH-g) in, accordance with <br /> EPA Method 8015-Modified; <br />' Benzene; toluene, ethylbenzene and xylenes (BTEX); and fuel additives methyl tertiary- , <br /> butyl-ether(MTBE),tertiary butyl alcohol (TBA), di-isopropyl ether(DIPS), ethyl tertiary- <br /> butyl ether (ETBE), tertiary-amyl methyl'ether,(TAME), 1,2-dibromoethane (EDB), and <br />' . (1,2-DCA) in-accordance with EPA Method 8260B. <br /> 1,2-d�chloroethane ( ) . <br /> 3.0. FINDINGS ' .. <br />' Ground water elevation and flow direction were inferred from field data. The hydrocarbon-impact <br /> to ground water was quantified by laboratory analysis of the ground water samples. <br /> 3.1. GROUND WATER ELEVATION AND FLOW DIRECTION <br /> • relative depth to groundwater ranged from 6.17 feet to 7.23 feet below <br /> On 10 December 2005,the p g g <br /> the tops of the well casings-(btoc);the ground water elevation was calculated at between 32:19 feet <br />' (MW-4) and 33.19 feet (MW-2) above mean sea level (MSL). Ground water was inferred to flow <br /> towards the north at a gradient of between 0.002 ft/ft in the southern portion of the site and 0.01 ft/ft <br /> 'in the northern portion of the site. Ground water elevation data is presented in Table 1 'and the <br /> contoured ground water elevation data is shown on Figure 1 <br />' 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> In fourth quarter 2005, TPH-g and the BTEX compounds benzene and ethylbenzene were detected <br />' in onlyAground water sample MW-4,at concentrations.of 200 micrograms per liter(pg/1), 15 µg/l <br /> and 12µg/l,respectively.No additional'analyies were'detected at or above laboratory reporting limits ; <br /> in the analyzed samples. <br /> Analytical.'results of,ground water samples are summarized in Table 2. The laboratory report <br /> (CTEL Project No:' CT214-0512092),quality assurance/quality control (QA/QC)reports and chain of custody-forms are"included in`Appendix C.-Documents, confirming the upload of laboratory <br /> electronic„deliverable. format (EDF) files and,depth to water'measurements to GeoTracker-are <br />' included as Appendix D. <br />' Advanced GeoEnvironmckal,Inc. <br />