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31 March 2005 <br /> AGE-NC Project No 03-1080 <br /> Page 7 of 7 <br /> ' 29 feet bsg in B3 <br /> • Significant concentrations of TPH-g and TPH-d and a lesser concentration of xylenes were <br /> detected in the soil sample collected from boring B 1 at 15 feet bsg, east of dispenser D 1 In , <br /> ' addition,significant concentrations of TPH-g and TPH-d,as well as lesser concentrations of <br /> ethylbenzene,xylenes,MTBE,and 1,2-DCA were detected in the groundwater sample taken <br /> from boring B 1 <br /> ' The lateral extent of soil and ground water contamination in the dispenser area is defined to <br /> the west by boring 132 <br /> ' The vertical extent of hydrocarbon-impacted soil is defined in boring Bl, as no <br /> contamination was detected below 15 feet bsg in the samples analyzed <br /> ' AGE contacted CTEL regarding the low to non-detectable concentrations of BTEX <br /> compounds in the soil and groundwater samples relative to the TPH-g concentrations CTEL <br /> confirmed that the petroleum hydrocarbon products detected in the analyzed samples were <br /> taged or degraded AGE concludes that the contamination found in soil borings at the <br /> dispenser locations is possibly residual contamination left from the previous leaking UST <br /> investigation A copy of the confirmation letter from CTEL is included in Appendix F <br /> 6.0. RECOMMENDATIONS <br /> 1 <br /> Based on information collected during this investigation and from records on file with the EHD, <br /> t AGE recommends no further action in regards to the current investigation in the dispensers- and <br /> piping-excavation areas The petroleum hydrocarbon products detected in soil boring samples appear <br /> to be aged or degraded, and contaminant concentrations are comparable to the estimated residual <br />!' mass values calculated when the site was closed in December 1998 i <br /> ' 7.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> ' environmental consultants practicing in this or similar localities The findings were based upon <br /> analytical results provided by an independent laboratory Evaluation of the geologic/hydrologic <br /> ' conditions at the site for the purpose of this investigation was made from a limited number of <br /> available data points(i a soil and ground water) No other warranty,expressed or implied, is made <br /> as to the professional interpretation,opinions, and recommendations contained in this report <br /> 1 <br /> ' Advanced GeoEvironmental,Inc <br />