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AGE-NC Project No. 99-0559 <br />Page 6 of 14 <br />mg/kg total xylene (benzene was at 25 mg/kg). MTBE was detected at a concentration of <br />820 micrograms per kilogram (pg/kg). The sample collected from 110 feet (CPT2-110 — <br />upper HU5) contained TPH-g at 4.9 mg/kg; BTEX compounds were detected in at <br />concentrations as high as 0.53 mg/kg total toluene (benzene was at 0.18 mg/kg). MTBE <br />was detected at a concentration of 30 pg/kg. The sample collected from 135 feet (CPT2- <br />135 — middle HU5) contained TPH-g at 2.4 mg/kg; BTEX compounds were detected in at <br />concentrations as high as 0.51 mg/kg toluene (benzene was at 0.16 mg/kg). MTBE was <br />detected at a concentration of 16 pg/kg. <br />ANALYTICAL RESULTS OF GROUNDWATER SAMPLES: APRIL 2001 <br />A total of eleven groundwater samples were collected from HU1, HU2, HU4, Upper HU5 <br />and Lower HU5 and submitted for laboratory analysis. <br />HU1 <br />Samples CPT1-60 and CPT3-60 were collected from HU1, the upper most occurrence of <br />groundwater from the CPTs. TPH-g and BTEX compounds were not detected in samples. <br />However, the fuel additive MTBE was detected in CPT1-60 and CPT3-60 at a maximum <br />concentration of 17,000 pg/I (CPT3-60). <br />HU4 <br />Samples CPT1-100, CPT1-100 and CPT3-100 were collected from HU4, the most <br />pronounced flow unit defined at the site. TPH-g was detected in samples CPT1-70 and <br />CPT2-100 at concentrations of 6,700 pg/I and 710 pg/I, respectively. The BTEX <br />compounds were detected in samples CPT1-100 at concentrations of 1,100 pg/I, 89 pg/I, <br />410 pg/I and 900 pg/I, respectively. The BTEX compounds were detected in samples <br />CPT2-100 at concentrations of 100 pg/I, 120 pg/I, 10 pg/I and 47 pg/I, respectively. The <br />fuel additive MTBE was detected in CPT1-100, CPT2-100 and CPT3-100 at a maximum <br />concentration of 870 pg/I (CPT3-100); <br />HU5 upper <br />Samples CPT1-130, CPT2-130 and CPT3-130 were collected from the upper portion of <br />HU5. TPH-g was detected in sample CPT1-130 at a concentration of 4,700 pg/I. The BTEX <br />compounds were detected in samples CPT1-130 at concentrations of 94 pg/I, 570 pg/I, 110 <br />pg/I and 540 pg/I, respectively. The BTEX compound toluene and xylenes were detected <br />in samples CPT3-130 at concentrations of 0.59 pg/I and 2.4 pg/I, respectively. The fuel <br />additive MTBE was detected in samples CPT1-130 and CPT3-130 at a maximum <br />concentration of 1,100 pg/I (CPT1-130). <br />Advanced GeoEnvironmental, Inc.