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AGE-NC Project No. 99-0559 <br />Page 8 of 14 <br />HU5 and Lower HU5 and submitted for laboratory analysis. <br />HU2 <br />Samples CPT4-70, CPT5-70, CPT6-70, CPT7-70 and CPT8-70 were collected from HU2, <br />the upper most occurrence of groundwater from the CPTs. TPH-g was detected only in <br />samples CPT4-70 and CPT8-70 at concentrations of 1,100 micrograms per liter (pg/I) and <br />150 pg/I, respectively. The BTEX compounds toluene and xylenes were detected in sample <br />CPT8-70 at concentrations of 1.4 pg/I and 1.1 pg/I, respectively. The fuel additive MTBE <br />was detected in CPT4-70, CPT6-70 and CPT8-70 at a maximum concentration of 1,500 <br />pg/I (CPT4-70); ETBE were detected in CPT4-70 and CPT8-70 at a maximum <br />concentration of 3.4 pg/I (CPT4-70); and 1,2-DCA was detected in CPT8-70 at 6.2 pg/I. In <br />addition, the cleaning solvent TCE was detected in samples CPT5-70 and CPT8-70 at <br />concentrations of 1,700 pg/I and 10 pg/I, respectively; CPT-5 and CPT-8 are the <br />westernmost borings of the investigation. <br />HU4 <br />Samples CPT4-90, CPT5-100, 0P16-100, CPT7-100 and CPT8-100 were collected from <br />HU4. TPH-g was detected in samples CPT4-90, CPT6-100 and CPT8-100 at <br />concentrations of 2,000 pg/I, 450 pg/I and 180 pg/I, respectively. The fuel additive MTBE <br />was detected in samples CPT4-90, CPT6-100 and CPT8-100 at a maximum concentration <br />of 2,600 pg/I (CPT4-90); ETBE and TAME were detected in CPT4-90 at 25 pg/I and 5.6 <br />pg/I, respectively; and TBA and DIRE were detected in CPT8-100 at 630 pg/I and 18 pg/I, <br />respectively. In addition, the solvent TOE was detected in samples OPTS-100 and CPT8- <br />100 at concentrations of 5.2 pg/I and 9.1 pg/I, respectively. BTEX compounds were not <br />detected in the HU4 samples. <br />HU5 Upper <br />Samples CPT4-120, OPTS-130, CPT6-125, CPT7-130 and CPT8-125 were collected from <br />Upper HU5. TPH-g was detected only in sample CPT6-125 at 190 pg/I, and the fuel <br />additive MTBE was detected in samples CPT4-120, CPT6-125 and CPT8-130 at a <br />maximum concentration of 91 pg/I (CPT6-125). No other analytes were detected in the <br />Upper HU5 samples. <br />HU5 Lower <br />Samples OPTS-150, CPT6-150, CPT7-150 and CPT8-165 were collected from Lower HU5. <br />Advanced CeoEnvironmental, Inc.