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1 ' 05 January 2004 AGE-NC Project No. 95-0137 ' Page 6of8 The estimated mass of hydrocarbons removed was based on laboratory analysis of soil-vapor samples, ' the flow rate and operational time; the operational results are summarized on Table 1. A total of 26.95 kg(59.425 lbs) or 9.5 gallons of hydrocarbons as gasoline was removed between September and December 2003; the volume and mass calculations are.' attached in Appendix D. A total of 2,122.45 kg (4,229.12 lbs), or a volume of 748.5 gallons hydrocarbons as gasoline was removed between December 2000 and December 2003. 1 3.4. GROUND WATER GRADIENT AND FLOW DIRECTION 1 Depths to ground water on 04 November 2003 ranged from 25.58 to 26.61 feet below the well casing tops; the depth to ground water has increased an average of 1.6 feet from t May 2003 monitoring yyl J 64 ' event.The calculated groundwater elevations ranged from 31.06 feet(MW- to 34.34 feet(MW-5), S�t � and ground water flow was inferred to be northeast at a hydraulic gradient of 0.028 foot/foot at the. former UST area,from well MW-2.to MW-1 (Figure 3);the overall gradient at the site was northerly. 3.5. ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g, TPH-d and BTEX compounds were not detected in the ground water samples from wells. The lead scavenger 1,2-DCA was detected in samples MW-1, MW-2 and MW-4 at concentrations ' of 8.9 gg/l, 15 pg/l and 76 µg/1, respectively.No additional contaminants of concern were detected in the analyzed samples. ' Analytes were not detected in grab ground water samples CB 1, C132, CB4 and CB5, collected from the tenninal depth of the confinnation soil borings. `rhve H dro punch ' The analytical results are summarized in Tables 5 and 6.A copy of the laboratory report(CTEL Labs'' ID Numbers 0311038, 0310112-9, -18, 0310-128-9 and'-18), quality assurance and quality control � � ' (QA/QC) report and chain-of-custody form are included in Appendix E/F. cop"� o3 3 dam, ' 3.6. HYDROCARBON-IMPACTED SOIL A total-of thirty- x soil samples were analyzed for TPH-g,TPH-d, BTEX and MTBE. Only�y-� 61 . ' soil samples were analyzed for the suite of five fuel additives by EPA Method 8260 Modified. . • TPH-d was detected in soil samples CB 1-20,C132-20,C133-20 and CB5=20 at concentrations ' of 490 milligrams per kilogram (mg/kg), 1,300 mg/kg, 610 mg/kg and 160 mg/kg. • TPH-g, BTEX compounds and fuel additives were not detected in the soil samples. ' Advanced Geo Environmental,Inc.