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' 15 November 2005 <br /> AGE-NC Project No 05-1256 <br /> ' Page 6 of 7 <br /> The lateral extent of petroleum hydrocarbon-impacted ground water is illustrated on Figure 7 <br /> No other target analytes were detected at or above laboratory detection limits in the samples <br /> 1 analyzed Analytical results of grab ground water samples are summarized in Table 2 The laboratory <br /> report(CTEL Project No CT214-0508090),QA/QC report,and chain of custody forms are included <br /> in Appendix B <br /> 5.0. SUMMARY AND CONCLUSIONS <br /> ' Based on the data collected at this site, AGE concludes <br /> • From surface grade to approximately 4 feet bsg, dark brown to black, dry to slightly moist <br /> organic topsoil was encountered throughout the site,generally underlain by a layer of brown, <br /> moist sandy silt and sand to approximately 13 feet bsg From 13 feet to approximately 20 feet <br /> ' to 23 feet bsg,brown,dark brown, and gray-brown clayey silt and silty clay were identified <br /> A V2-foot to 1-foot thick layer of clayey sand and sandy clay occurs throughout most of the <br /> southern portion of the site at a depth of approximately 20 feet to 24 feet bsg, underlain by <br /> • silty sand and sand to the total depth of the borings <br /> • The highest concentrations of TPH-g and MTBE were detected in the soil sample collected <br /> ' from boring B3 at 20 feet bsg, west of the USTs In addition, significant concentrations of <br /> TPH-g and MTBE, as well as lesser concentrations ofBTEX constituents were detected in <br /> the ground water samples taken from borings BI through B3, also in the vicinity of the <br /> ' USTs <br /> • The lateral extent of ground water contamination is defined only to the north,by boring B5, <br /> ' the vertical extent of hydrocarbon-impacted soil is not defined <br /> r <br /> ' 6.0. RECOMMENDATIONS <br /> Based on the findings and conclusions of this investigation,AGE recommends preparation of a work <br /> tplan to define the vertical and lateral extent of petroleum hydrocarbon-impacted soil and ground <br /> water, the work plan should include advancement of additional soil bonngs and installation of <br /> ' monitoring wells <br /> • <br /> ' Advanced GeoEvironmental,Inc <br /> 1 <br />