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' 22 September 2000 - - - - - --- - - <br /> AGE-NC Project No 00-0753 <br /> Page 4 of 5 <br /> ' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> Excluding sample 132-112O, TPH-g and TPH-mo were detected in the ground water samples at <br /> ' concentrations as high as 50,000 gg/l and 1,500 µg11,respectively(both in sample 134-1120) 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 gg/l (sample B4-H20) <br /> Benzene was only detected in samples B3-H20 and B4-H2O at concentrations of 19 gg/l and 420 <br /> gg/l,respectively The remaining BTE&X compounds ranged from below detectable limits in sample <br /> ' 132-1120 to 9,900 gg/l of xylenes in sample B4-H20 MTBE was not detected above laboratory <br /> reporting limits in the ground water sample analysis <br /> ' Analytical results of ground water 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 /> I ' 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 Grantlme Road There are <br /> currently four ground water monitoring wells located at 575 West Granthne Road Monitoring and <br /> sampling of the well network has been ongoing since May 1995 to the present The most previous <br /> Advanced GeoEnv&onmentai,Inc <br />