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Results of Investigation: SSI - Phase One <br /> with depth we ., <br /> p re present at the Site and resulted in <br /> installation of deep-well MW-7, during Phase Two <br /> ' of the SSI <br /> RESULTS OF INSITU BIOREMEDIATION <br /> ' FEASIBILITY STUDIES <br /> The results of the plate counts are summarized in <br /> 1 Table 4 The results indicate that the existing <br /> microbial population in the site soils includes a <br /> subpopulatlon of microorganism capable of <br /> degrading petroleum hydrocarbons and this <br /> population is within the range acceptable for <br /> biological degradation of TPH Furthermore, a <br /> comparison of the microbial hydrocarbon utilizer <br /> (HCU)population as a percentage of the total <br /> microbial population indicates that in the TPH- <br /> impacted soil(HP-3SE)the HCU microbial <br /> population is approximately two orders of <br /> magnitude higher than the unimpacted soil (HP- <br /> 3 SF) These results indicate that intrinsic <br /> biodegradation of TPH is occurring which in turn <br /> results in the increase in the HCU microbial <br /> population This is further corroborated when <br /> considering that the impacted sample contains a <br /> relatively low TPHg concentration(1 3 mg/kg) In <br /> addition,not only is the magnitude of the HCU <br /> population greater by approximately two orders of <br /> magnitude in the impacted soil sample, but the <br /> total microbial populations are actually greater in <br />' the non-impacted sample than the impacted soil <br /> sample This is strong supportive evidence that <br /> intrinsic biodegradation of TPH is occurring <br /> i <br /> 1 <br /> L 130000\387371WP138737N19 Harding Lawson Associates 13 <br />