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01 February 2005 <br /> AGE-NC Project No. 98-0521 <br /> Page 4of6 <br /> • Fuel additives di-isopropyl ether(DIPE), ethyl tertiary-butyl ether(ETBE), methyl tertiary- <br /> , buty ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> 1,2-dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA <br /> Method 8260B. <br /> 3.0. FINDINGS <br /> The ground water flow direction and gradient were inferred from the field data. Dissolved petroleum <br /> hydrocarbon-impact to ground water was quantified by laboratory analysis of the samples collected. <br /> 3.1. ANALYTICAL. RESULTS OF EXTRACTION WATER SAMPLES <br /> TPH-g and TRPH were detected in the influent sample collected at concentrations of 200 <br /> micrograms per liter (µg/1) and 1,700 pg/l, respectively. Benzene and MTBE were detected at <br /> concentrations of 7.4 µg/1 and 160 ltg/l, respectively. Zinc was detected in the influent sample at a <br /> concentration of 0.074 mg/l. <br /> No contaminants of concern were detected in the effluent ground water treatment sample.Analytical <br /> results from the ground water extraction samples are summarized in Tables 2 and 3. The laboratory <br /> report(CTEL Project No. CT214-0405151),duality assurance/quality control(QA/QC)reports and <br /> chain of custody form are provided in Appendix D.GeoTracker confirmation pages of the submitted <br /> laboratory electronic deliverable format (EDF) files are included in Appendix E. <br /> 3.2. GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIENT <br /> On 26 May 2004, the depth to ground water at the site ranged from 5.80 to 7.92 feet below the tops <br /> of the well casings. The ground water elevations at the site ranged from 5.89 feet (MW-5) to 7.54 <br /> feet (MW-3) below mean sea level (MSL). The ground water flowed in a northeast trending ridge <br /> with a limb flowing north-northeast at a gradient of 0.015 ft/ft and the other limb flowing east- <br /> southeast at 0.011 ft/ft. Depth to water and ground water elevation are summarized in Table 1. <br /> .. Figure 3 illustrates the contoured ground water elevations. <br /> 3.3. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> Monitoring wells MW-1 through MW-4 are screened through first ground water; monitoring well <br /> MW-5 is screened through a deeper water zone. <br /> = Advanced GeoBnvironmental.Inc. <br />