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10 Summary and Conclusion <br /> Results of the bioassessment indicate that the Van Den Bergh conditions are acceptable for <br /> successful bloremedlatlon The results of the bioassessment are summarized below <br /> * pH 1s within the acceptable range for bioremediation <br /> Phosphate levels are low and ammonium concentrations are less than the detection linut <br /> The positive response of the microbes to nutrient enhancement during the stimulation test <br /> indicates the necessity of nutrient amendment <br /> • Viable microbial populations exist at the site and appear to have adapted to site conditions <br /> • Heterotrophic and hydrocarbon degrading microbial populations reacted very favorably to <br /> oxygen and nutrient stimulation <br /> • Percent moisture was adequate in the sandy silt and silt samples and low in the sand <br /> sample <br /> During soil bioremediation, soil moisture content, inorganic nutrients, pH, and microbial <br /> population densities must be monitored and maintained These parameters are typically monitored <br /> quarterly or semiannually for bioventing The soil being treated must be aerated on a regular basis <br /> in order to promote microbial growth Bioventing systems are constantly aerated by injecting or <br /> 1 <br /> extracting air from the treatment area <br /> ve/14 4 <br />