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F f •16 October.I997 t , AGE-NC Project No. 96-'6231 '' } Page 4 of 3.3 F .ANALYTICAL RESULTS OF SOIL,SAMPLES A: total' of sixteen sol f l; samples .from'P-1 through P-5 were submitted-to. a,MM for, analysis.of ' oxygenated.petrolem u -hydrocarbon coiripound' (MTBE;ETBE,- TBA; DIPE and TAME):MTBE . was detected in a soil.sample coli p acted from P-1 at 35 feet (P1-35) at a concentration of 140"part- per billion(ppb; reported as micrograms per kilogram). The laboratory analysis of the other.selected, " ' soil samples did not detect any.MTBE, ETBE, DIPS, TBA or.:TAME. Analytical, results'of soil'sample.s are summarized in Table I -Analytical Results of Soil San�pleS.,. Figures 3 depicts'the analysis of oxygeriated:petroleuin-hydrocarbon compounds beneath the-site'in' - . cross seciional'view..The lab r o 'tory reports (MAI Identification No. 799 i$ to 79929, 80500 to ..-80543,,80560 to,80564 and 81095 to 81141).and chain-of-custo'dyare included in Appendix B'" 3.4. ANALYTICAL RESULTS OF GROUND WATER.SAMPLES' Afatal of eleven ground water samples from P'-1 through P-5 were submitted to MAI for analysis .6f MTBE, ETBE, TBA,-DIPE and:TAME. MTBE was detected from P-I at intervals be'tween,23 to 27 feet bsg(P1-23 to 27) and 46 to 50 feet bse.(P1-'46 to 50) and from P-5 at an interval between, 21 to 25 feet bsg (P5-2 I- to 25)'at concentrations of 410 ppb;-72.ppband 100 ppb.(reported as Y micrograms per liter), respectively. TBA was detected from P1-23 to 27,T1-46 to'50'and P5-`21 to' 25 at concentrations of 25 ppb,-I 1 ppb and 6.6'ppb, respectively. , Analytical results of ground water samples are summarized in-Table 2-Analytical Results of Ground: t Water Samples. The laboratory report (MAI Identification No': 79932 to 79935 80495 to 80498 - 80567,to 80568 anis 81104 to.81105) and chain-:T-custody `are included in Appendix B: 4.0. SUMMARY AND CONCLUSIONS' _, Based on the results of'soil boring activities in August an September.`1997; AGE concludes. Laboratory data, indicates' that ' oxygenated petroleums=hydrocarbon compounds, were' encountered•from P-1-between 23 and`50 feet bsg and°from P-5 between 21,,to 25 feet bsg. . Field observations (PID readings), laboratory data and Historical grounds water sampling; performed at the siteA endix ( pp C) suggests that the MTBEground water plume has taken a relatively narrow, elongated oval shape (Figure 5- Approximate Extent of Dissolved MTBE). 'Laterally, the dissolved MTBE .plume appears to have migrated_ off-site in 'a southwest direction and extend ' . towards,a domestic water well located:approximately;i 00 feet - iAdvanced Geai;m"nniejitui,inn.