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ASSLT C. <br /> OCI ATES I N C . <br /> samples collected from wells MW1 through MW6 indicate that the extent of the TF <br /> g Hd plume <br /> appears to be less than 60 feet from the former UST in all directions as shown on Figure 5. None <br /> of the soil or groundwater samples collected from the beneath the location of the former 10,000- <br /> gallon UST contained oxygenate fuel additives. <br /> The free product encountered during the advancement of boring MW4 was not present in the <br /> groundwater sample collected. from the well. None of the groundwater monitoring wells <br /> contained free product or an oily sheen. Generally, concentrations of TFHd in the samples <br /> collected from groundwater wells MW 1, MW2, and MW3 have been steadily decreasing since <br /> they were instalied'in August 1998. <br /> The groundwater gradient at the site has been consistently south to southwest. The soil samples <br /> collected from borings SB8, S139, and SB 10 and wells MW5 and MW6, which are located south <br /> and southwest of the former UST location, contained no detectable concentrations of petroleum <br /> hydrocarbons. The groundwater samples collected from borings S138, SB9, and SB 10 and wells <br /> MW5 and MW6 contained no detectable concentrations of petroleum hydrocarbons. Based on <br /> this information, the TPHd plume appears to be stable. ATC recommends performing <br /> groundwater monitoring at the'site for four additional quarters. If groundwater samples from the <br /> perimeter wells (MW1, MW4, and MW5) do not contain petroleum hydrocarbons. during the <br /> next four quarters of monitoring, ATC will recommend no further action and request that the site <br /> be granted closure. <br /> L <br /> w:154.6250Mreportslsumiii.doc 9 <br />