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I V 09 January 2003 • AGE-NC Project No. 95-0114 Page 5 of 9 Hydrological units are depicted in cross sectional view A-A' (Figure 3). I 3.3. LABORATORY RESULTS OF GRAB GROUND WATER SAMPLES A total of eighteen discrete, grab ground water samples was collected from HU1, HU2, HU4 and HU6 and submitted for laboratory analysis for the constituents listed in Section 2.2 (Table 1): HU1 Samples CPT3-45 and CPT7-50 were collected from HU1. Only the volatile organic compounds (VOCs)tetrachloroethene(PCE), trichloroethane (TCE) and cis 1,2-dichloroethane(cis 1,2-DCE) were detected, in sample CPT3-45 at concentrations o£99 micrograms per liter(µg11), 19 µg/1 and 21 µg11, respectively. HU2 Samples CPT3-62, CPT5-50 and CPT6-50 were collected from HU2. TPH-ss was detected in samples CPT3-62 and CPT5-50 at concentrations of 110µg/1 and 300µg/l,respectively.In addition, the VOCs PCE and TCE were detected in samples CPT5-50 and CPT6-50 at maximum concentrations of 270 µg11 and 130 µg11, respectively(sample CPT5-50),cis 1,2-DCE was detected in sample CPT5-50 at 120 µg11, and 1,2-dichloropropane was detected in sample CPT3-62 at 2.2 µg/l. HU4 Samples CPT 1-80,CPT2-75,CPT4-75,CPT5-70,CPT6-77 and CPT7-80 were collected from HU4. TPH-ss was detected in CPT1-80, CPT2-75 and CPT4-75 at a maximum concentration of 130 µg/1 (CPT1-80 and CPT2-75).The VOC PCE was detected in samples CPT4-75 and CPT7-80 at 6.1 µg/1 and 3.0 µg/1, respectively. In addition, cis 1,2-DCB and TCE were detected in sample CPT4-75 at 7.7 µg/1 and 5.4 µg/1, respectively. HU6U6 Samples CPT1-120, CPT2-115, CPT3-110,CPT4-110,CPT5-120, CPT6-120 and CPT7-120 were collected from HU6. TPH-ss was detected in samples CPT1-120, CPT2-115, CPT3-110 and CPT4-110 at a maximum concentration of 360µg11 (CPT1-120). PCE was detected in samples Advanced GcoEnviron mental,Inc.