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' 18 August 1997 <br /> • <br /> AGE-NC Project No. 95-0185 <br /> ' Page 4 of 5 <br /> ' sample from MW-1, near the former UST area, at 1.2 ppb. Analytical results of monitoring well <br /> ground water samples are summarized in Table 2. The laboratory report(MAI Laboratory I.D. Nos. <br /> 77316 to 77319), and chain-of-custody form are included in Appendix B. <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> tThe following conclusions were drawn from the results of this investigation: <br /> • Ground water elevation at the site increased, reaching the lower vertical extent of the former <br /> UST excavation. <br /> ' A well survey revealed the presence of three municipal and/or domestic ground water wells <br /> within 2,000 feet of the site. Available documentation indicates that each well had an <br /> approved sanitary seal installed. <br />' Hydrocarbon-impacted soil remains in the vicinity of the former UST area. Approximately <br /> 95 cubic yards, and possibly more, of hydrocarbon-impacted soil remains in the vadose zone <br /> lie at the site. <br /> • Concentrations of TPH-g and BTE&X hydrocarbons have remained stable in the area of the <br /> impacted monitoring wells,both on the site and off the site. However a significant increase <br /> of TPH-d concentrations were observed in the core area of the dissolved hydrocarbon plume. <br /> Well MW-2 appears to be Iocated beyond the southern edge of the dissolved TPH-d plume <br /> and the location of monitoring well MW-3 remained within the western boundary of the <br /> plume. <br />' The northern and eastern margins of the dissolved phase plume have not been fully <br /> delineated. <br /> 5.0. RECOMMENDATIONS <br />' Based upon data collected at the site, AGE recommends the following: <br /> g <br /> • To reduce the concentration of TPH-d in the groundwater at the site,-.AGE recommends an . ; <br /> interim active remediation of the remaining petroleum hydrocarbon-impacted soil. Removal <br /> of TPH-d impacted soil would reduce the hydrocarbon mass remaining in contact with or <br />' near the ground water at the site. <br /> . Soil accumulated from the installation of the monitoring well has been aerating. The soil <br />' -should be sampled, analyzed and spread on the site if hydrocarbon concentrations have been <br /> AAanced GeoEnvironmental,Inc. <br />