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22 September 2000 <br /> AGE-NC Project No. 00-0753 <br /> Page 4of5 <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> Excluding sample B2-H2O, TPH-g and TPH-mo were detected in the ground water samples at <br /> concentrations as high as 50,000 µg/1 and 1,500 gg/l,respectively(both in sample B4-1120), TPH-d <br /> was detected in the ground water samples collected from borings B-1 through B-6 at concentrations <br /> as high as 15,000 µg/l(sample B4-H20). <br /> Benzene was only detected in samples B3-H20 and B4-H20 at concentrations of 1.9 µg/1 and 420 <br /> µg/l,respectively. The remaining BTE&X compounds ranged from below detectable limits in sample <br /> 132-H20 to 9,900 µg/1 of xylenes in sample B4-H2O. MTBE was not detected above laboratory <br /> reporting limits in the ground water sample analysis. <br /> Analytical results of groundwater samples are summarized in Table 2. The laboratory report(MCAT <br /> Lab I.D. number 46458 through 46463) and chain-of-custody are included in Appendix A. <br /> 4.0. CONCLUSIONS AND RECOMMENDATIONS <br /> Based on findings of this investigation, AGE concludes: <br /> • Soil is impacted by petroleum hydrocarbons with the exception of the southern most portion <br /> of the site. The highest concentrations of petroleum hydrocarbon-impacted soil resides in the <br /> central western portion of the site, in the area of boring B-4. Petroleum <br /> hydrocarbon-impacted soil was not encountered in the saturated zone at a depth of 15 feet <br /> bsg. <br /> • Ground water is impacted by petroleum hydrocarbons with the exception of the southeast <br /> portion of the site. The highest concentrations of petroleum hydrocarbon-impacted ground <br /> water resides in the central western portion of the site, in the area of boring B-4. <br /> • The lateral extent of adsorbed petroleum hydrocarbon-impacted soil has not been defined to <br /> the north, east, and west of the site. <br />' • The lateral and vertical extent of dissolved petroleum hydrocarbon-impacted ground water <br /> has not been defined. <br /> Petroleum hydrocarbon contamination may be the result of an unauthorized release associated with <br /> the removal of four USTs in 1994 on the adjacent site at 575 West Grantline Road. There are <br /> currently four ground water monitoring wells located at 575 West Grantline Road. Monitoring and <br /> sampling of the well network has been ongoing since May 1995 to the present. The most previous <br /> Advanced Ge.aFnvirenmental,Inc. <br /> 9 'd LT0E0a860a juagTe uenR dLe :60 oe BZ das <br />