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ENVIROLOC 106 <br /> TECHNOLOGIES, INC. <br /> Biological Response Groundwatcr samples were obtained from the monttoring <br /> wells to observe changes in total bacteria populations Initial results indicated that <br />' little biological activity was occurring within the contaminant plume Within the <br /> first 100 days, however, biological activity increased by nearly two orders of <br /> magnitude in some areas of the plume (Figure 2) Slower responses were noted in <br /> dowtigradtent monitoring wells due to the delay to oxygen arrival at these areas <br /> All wells have continued to show an increase in biological activity through day <br /> 316 of the remediation effort <br /> E <br /> 5000000 <br /> 4000000 <br /> � 3000000 <br /> a <br /> 2000000 <br /> 1000000 <br /> 'U <br /> 4 t} <br /> C» <br /> p MW-1 MW-2 MW-3 MW-5 MW-14 <br /> F Monitoring Well Number <br /> p 1 ]125195 R 3/4196 is 616196 ■ 10/6/96 <br />' FIGURE 2 Change in 'Fotal Bacteria Population <br /> Contiminant Response. Analytical results indicate that significant contaminant <br />' degradation is occurring Benzene concentrations have shown the most dramatic <br /> response to the treatment Historical monitoring data indicated that very little <br /> natural attenuation of benzene was occurring near the former primp island area <br />' Within 316 days of the installation of ORC, however, benzene analytical results <br /> indicate that a significant increase in the rate of natural attenuation has occurred <br /> (Figure 3) Similar effects were observed in all of the monitoring wells located <br />' within the plume <br /> The overall mass of the plume has shown a marked decrcase since the <br />' installation of the ORC Analytical results indicate that the contaminant mass <br /> has decreased by 54 percent over the first 316 days {Table 1) This has restiltcd in <br /> the stable plume becoming a shrinking plume (Figure 4) <br />' CONCLUSIONS <br /> This study, as have others (Johnson, Methvin and Moreland 1996), indicates that <br />' 01ZC has effectively enhanced the natural attenuation of BTEX compounds at this <br /> site Accelerated natural biodegradation rates and significant increases in <br /> 0 biological activity were measured across the: site The accelerated natural <br />' degradation rates using source treatment can significantly reduce the time and <br /> effort required to achieve closure <br /> VT ' d dzs = 9D 65- t�T -�aa <br />