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Appendix B Advanced <br /> AGE Project No. 99-0559 Environmental <br /> Page 6 of 12 n.M 9 <br /> were detected in at concentrations as high as 0.51 mg/kg toluene (benzene was at 0.16 <br /> mg/kg). MTBE was 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/l, 120 pg/I, 10 pg/I and 47 pg/l, 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 <br /> BTEX compounds were detected in samples CPT1-130 at concentrations of 94 pg/I, 570 <br /> pg/I, 110 pg/I and 540 pg/I, respectively. The BTEX compound toluene and xylenes were <br /> detected in samples CPT3-130 at concentrations of 0.59 pg/I and 2.4 pg/I, respectively. <br /> The fuel additive MTBE was detected in samples CPT1-130 and CPT3-130 at a maximum <br /> concentration of 1,100 pg/I (CPT1-130). <br /> HU5 lower <br /> Samples CPT1-150, CPT2-150 and CPT3-150 were collected from the lower portion of <br /> HU5. TPH-g was detected in sample CPT1-150 at a concentration of 10,000 pg/I. The <br /> BTEX compounds were detected in samples CPT1-130 at concentrations of 47 pg/I, 410 <br /> pg/I, 150 pg/I and 810 pg/I, respectively. The fuel additive MTBE was detected in samples <br /> CPT1-150 and CPT3-150 at a maximum concentration of 1,200 pg/I (CPT2-150). <br />