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1 • • <br /> YARIsLEs <br /> There were two events that occurred during the course of this study that had <br /> unquantified impacts on the site. The fust was the partial excavanon of <br /> contaminated soil upgradient of the barriers. During the backfilling of the <br />' excavation 500 pounds of pure ORC-, which equates to twenty pounds of available <br /> oxygen, was mixed in with the clean fill to act as an additional source of oxygen. <br /> The second event was a dewatering activity downgradient of the barriers. The <br />' dewatering consisted of pumping approximately 12 million gallons of water over <br /> a four week period from multiple off-site locations. The excavation was completed <br /> in March 1995 and the dewatering occurred during November 1995. <br /> 1 CONCLUSIONS <br /> There are three indscators of bioremediation (National Research Council, 1993). <br /> (1) Decrease in the volume of contamination. <br />' (2) The presence of microbes capable of degrading the contaminant of concern. <br /> (3) Actual indication that biodegradation occurred. <br /> 1 The results of monitoring have shown an increase in DO levels and a <br /> decrease in BTEX levels along the barriers and varying degrees downgradient of <br /> the b=ers 'There is clearly far field (Figure 3) and near field (Figure 4 and <br /> 1 Figure 5) behavior demonstrated by the areal (away from barrier) and cross- <br /> se=onal (near barrier), respectively. There was Limited biological analysis done <br /> that showed that there were indigenous hydrocarbon degrading microbes pr=nt <br /> in sufficient quantities to degrade the contaminants of concern. ne objective to <br /> determ, me if ORCO was able to increase DO levels was successful The secondary <br /> 1 objective to show evidence of increased biodegradation occurring at the site was <br /> also successful. <br /> FEpF_RF CES <br /> Golden Software. 1994. Surfer for Windows User's Guide Version 5. Golden <br /> Software, Inc., Golden, CO. <br />' GRAM, Inc 1994. ORC Pllor Study Report, Belen, New Mexico GRAM, Inc , <br /> Albuquerque, NM <br /> tNational Research Council, Committee on In Situ Biorzmediation. 1993. In Situ <br /> 3 iremedration, lUan Dies it Work. Natcral Academy Press, Washira_on, D.C. <br />' Odencrantz, J. E., I. G. Johnson, and S. S Koenigsberg. 1995. 'Enhanced <br /> Intrinsic Bioremediation of Hydrocarbons Using an Oxygen-Releasing Compound." <br />' Remediation 5(4): 99-114. <br /> Regenesis Bioremediation Products 1995. Oxygen Release Compour& (ORC) <br />' Produa Description and Pnce List. Regenesis Bioremediation Products, San Juan <br /> Capistrano, CA. <br /> 1 <br /> 80 - d d0£ = 90 66--171 -Z)50 <br />