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' <br /> _ s <br /> 03 March 1999 <br /> AGE-NC Project No 95-0142 <br /> d` Page 6 of 7 <br /> TBA was detected in vapor well VW-4 at a concentration of 47 ,ug/1 <br /> Analytical results for the ground water samples analyzed by EPA Methods 8015 Modified and 8020 <br />' are summarized in Table 4 Analytical results for the ground water samples as analyzed by EPA <br /> Method 8260 Modified are summarized in Table 5 The laboratory report (MAI Laboratory I D <br /> Nos 00077 through 00084), quality assurance and quality control (QA/QC) report and chain-of- <br /> custody form are included in Appendix D <br />' 4.0. CONCLUSIONS <br /> Based on data collected from the site, AGE concludes Y <br /> • Soil impacted with TPH-g and BTEX was detected in the soil boring at depths of 55 feet bsg <br />' and 60 feet bsg TPH-g in soil was limited to depths above 60 feet bsg BTEX was detected <br /> in soil to total depth of 80 feet bsg <br /> • DIPE, ETBE, MTBE, TAME, TBA were not detected in any of the sample collected from <br />' the soil boring <br /> • Ground water flow direction was toward the east from the former UST TK 1-90 at a average <br /> gradient of 0 001 feet/feet <br /> • Ground water levels were above the screened intervals of ground water monitoring wells <br />' MW-1, MW-2 and,MW-3, these wells may not be adequate to characterize the shallow <br /> dissolved-phase hydrocarbon plume The well screen intervals of wells MW-4, MW-5 and <br /> vapor wells ,VW-1 through WV-4 were adequate-to characterize the dissolved-phase <br />' hydrocarbon plume I I , x <br /> • Detectable concentrations of hydrocarbons were present in samples collected from the down <br /> i <br />' gradient wells MW-4 and. MW-5 The concentration of TPH-g and benzene in wells MW-3, <br /> MW-4 and MW-5 and vapor wells VW-2 and VW-4 have increased over the last quarter, <br /> while the dissolved hydrocarbon concentrations decreased in vapor wells VW-1 and VW-3 <br /> The highest concentration of dissolved petroleum hydrocarbons continues to be in the area <br /> ,of the documented release (vapor,well VW-1), located immediately adjacent to the former <br /> TK1-90 UST ! f r <br /> 1 • MTBE and TBA were detected in the ground water samples collected from,the site <br />' Ground water at a depth of 75 feet bsg, in the area of the documented release located <br /> immediately adjacent to the former TK1-90 UST, has been impacted by petroleum <br /> hydrocarbons <br />' Advanced GcoEnvironmental,Inc <br />