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45 East Harding Chronology <br /> Page 3 U , AFT <br /> Sample results from the 9/30/88 excavation: <br /> Sample ID- TPH-gasoline Benzene Toluene Ethylbenzene Xylene <br /> Depth (feet) (8015) (8020) <br /> E-19' 5820 ppm NA NA NA NA <br /> W-20' 6.47 ppm <0.01 0.22 <0.05 <0.05 <br /> S-20' <1.0 ppm <0.01 <0.01 <0.05 <0.05 <br /> N-22' 2710 ppm NA NA NA NA <br /> E-22.5' 570 ppm NA NA NA NA <br /> E-22.5' 3020 ppm NA NA NA NA <br /> SE-22' <1.0 ppm <.01 <.01 <.05 <.05 <br /> NE-26' 6240 ppm NA NA NA NA <br /> Note: All results in ppm mg/kg); BTEX analysis of three samples only. NA - Not Analyzed <br /> 10/6/88 The stockpiled soil was sampled on October 6, 1988, four to one composited, and <br /> the following results were obtained from Sequoia laboratory analysis on October 7, <br /> 1988. <br /> Sample ID/Depth TPH (gasoline) Benzene Toluene Ethylbenzene Xylenes <br /> Stockpile 4:1 100 ppm <.05 ppm <.1 ppm <.1 ppm 3.8 ppm <br /> composite <br /> Note: All results in ppm (mg/kg) <br /> 11/1/88 Two soil samples were collected for laboratory analysis from stockpiled soil that <br /> were field composited: <br /> Sample ID- TPH (gasoline) Benzene Toluene Ethylbenzene Xylene <br /> Stockpile <br /> #1 (A-D) 4.6 ppm <50 ppb 0.42 ppm 2.5 ppm <br /> #2 (A-D) 1.0 ppm <50 ppb <br /> 11/7/88 Six monitoring wells, MW1 - MW6, were installed. Soil samples were collected for <br /> analysis between 11/7/88 and 11/10/88. <br />