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<br /> 23 May 2003
<br /> AGE-NC Project No 95-0184
<br />' Page 5 of 9
<br /> values of between 1 x 10-9 to 1 x 10'm/s for the inter-bedded clay,stiff fine-grained soil and cemented
<br /> sand (Appendix A)
<br />' Hydrologic units are depicted in cross sectional view C-C' (Figure 3) J
<br />' 3 3 LABORATORY RESULTS OF GRAB GROUND WATER SAMPLES
<br /> A total of eleven discrete, grab ground water samples were collected from HU2, HU3, HU5, HU9,
<br /> I HU12,HU13 and HU14 and submitted for laboratory analysis for the constituents listed in Section
<br /> 2 2 (Tables 1 and 2)
<br /> oma'
<br /> HU2 Sample CPT3-58 was collected from IJU2 TPH-g and TPH-d were detected at concentrations
<br /> of 20,000 micrograms per liter(µg/1) and 400 µg/1,respectively The BTEX compounds benzene
<br /> and ethylbenzene were detec ,cj�G�EPA Method 8260 at concentrations of 5,400 µg/1 and 380 µg/l,
<br /> respectively In addition,the ,' Cs 1,2-DCA,isopropylbenzene and n-propyl benzene,were detected
<br /> lie at concentrations of 190 µg/1, 140 µg/1 and 300 µg/1, respectively
<br /> HU3 Samples CPT2-74 and CPT2-84 were collected from HU3 TPH-g and TPH-d were d tected
<br /> I at maximum concentrations of 70,000µg/1 and 34,000µg/1,respectively,in sample CPT2-74 BTEX
<br /> compounds were detected by EPA Method 8260 at maximum concentrations of 210 µg/1 benzene,
<br /> 8,000 µg/1 toluene, 3,400 µ ylbenzene aryl 17,000 µg/l xylenes, in sample CPT2-74
<br /> In addition, the followingW,445were detected at maximum concentrations of 120 µg/l
<br /> isopropylbenzene, 740 µg/1 naphthalene, 360 µg/1 n-propyl benzene, 2,400 µg/1
<br /> 1,2,4-tnmethylbenzene and 610 µg/1 1,3,5-trimethylbenzene, in sample CPT2-74 -A
<br /> HU5 Samples CPT2-94 and CPT3-94 were collected from HU5 TPH-g and TPH-d were detected
<br /> at maximum concentrations of 460 µg/1 and 260 µg/1, respectively, in sample CPT2-94 BTEX
<br /> I compounds were detected in sample CPT2-94 by EPA Method 8260 at concentrations of 1 7 µg/l
<br /> benzene, 15 µg/1 toluene, 6 8 µg/1 ethylbenzene and 40 µg/1 xylenEX compounds were not
<br /> detected by EPA Method 8260 in sample CPT3-94 In addition, s were detected In sample
<br /> CPT2-94 at concentrations of 12 µg/l naphthalene, 2 5 µg/1 n-propyl benzene, 21 µg/1
<br /> 1,2,4-tnmethylbenzene and 5 3 µg/1 1,3,5-tnmethylbenzene, VOCs were not detected in sample
<br /> CPT3-94
<br /> HU9 Sample CPT2-114 was collected at the HU8/HU9 boundary, sample CPT3-117 was collected
<br /> within HU9 TPH-g and TPH-d were detected at maximum concentrations of 14,000µgd and 15,000
<br /> µg/1, respectively, in sample CPT2-114 BTEX compounds were detected in sample CPT2-114 by
<br /> EPA Method 8260 at concentrations of 210 µg/l benzene, 1,200 µg/1 toluene, 370 µg/1 ethylbenzene
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<br /> Advanced GeoEnvironmental,Inc
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