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31 January 1997 <br /> AGE-NC Project No 95-0125 <br /> Page 6 of 7 <br /> 43 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> Petroleum hydrocarbons (TPH-g or BTE&X) were not detected in the soil samples collected from <br /> the stockpiled soil undergoing aeration MTBE was also not detected in the samples collected <br /> Analytical results of stockpiled soil samples are summarized in Table 3 -Analytical Results of Sod <br /> Samples The laboratory report(AIpha Analytical Laboratory batch No 96-1107-007) and chain-of- <br /> custody are presented as Appendix B <br /> 5.0. CONCLUSIONS AND RECOMMENDATIONS <br /> 51 CONCLUSIONS <br /> Based upon results of the soil probing investigation and monitoring well installation, AGE has the <br /> following conclusions <br /> • Between June and November 1996, concentrations of TPH-g and BTE&X decreased in wells <br /> MW-2 and MW-6 The low levels of dissolved hydrocarbons detected in monitoring well <br /> . MW-2 indicate the dispersion of hydrocarbons is ongoing at the site Dissolved hydrocarbons <br /> have dissipated or migrated from the previously impacted monitoring wells Previous trends <br /> of the analytical data collected from the monitoring wells at the site confirm the current <br /> trend However, sampling of monitoring well which surround the impacted wells have <br /> substantially proven the dissolved hydrocarbon plume to be stable, within the constraints of <br /> the monitoring well locations <br /> • The on-site aeration of excavated soil under permit from the SJVUAPCD was apparently <br /> successful The analytical data from soil samples collected from the stockpiled soil within <br /> the aeration treatment cell indicate that petroleum hydrocarbons have volatilized out of the <br /> soil <br /> Approximately 185 cubic yards of hydrocarbon impacted soil remains on the site, in the <br /> immediate vicinity of the former UST area Approximately 30 gallons of gasoline remain <br /> in the impacted soils at the site Impacted soil remains east and north of the December 1995 <br /> excavation boundaries and under the maintenance building on the site Impacted soil likely <br /> extends east of the site, under Hansen Road The distribution of remaining impacted soil at <br /> the site is illustrated 1n Figure 4 - Extent of Hydrocarbon Impacted Soil <br />