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Six samples each were analyzed for hydrocarbons (TPH and BTE&X) and microbiological <br />" density and species. The results of the laboratory analysis are presented in Tables 6 & 7. <br /> The laboratory report is included in Attachment F. <br /> Hydrocarbons <br /> No contamination was detected at depths of 15 or 40 feet in P1. Only very low <br /> concentrations of toluene, ethylbenzene and xylenes were detected at depths of 30 and 35 <br /> feet. The total of TPH concentrations between 20 and 35 feet is 2,441 ppm. In VW-1 (13-1), <br /> drilled and sampled in April of 1993, the total concentrations of TPH between 20 and 35 <br /> feet was 4,358 ppm. This indicates that the concentrations of hydrocarbons in the soil is <br /> nearly half of those measured in April of 1993. This is a strong indication that the <br /> inoculated bacteria are effective in reducing hydrocarbon contamination at the site. <br /> Bacteriology <br /> Table 7 summarizes the results of the bacteria density and species analysis. Relatively low <br /> numbers of bacteria are present in the non-contaminated zone above 20 feet. However, <br /> greater numbers of bacteria are present below 20 feet, indicating that the inoculated bacteria }. <br /> are present in the soil 5 feet northwest of VW-1. More information on the bacteriological <br /> analysis and interpretation is included in Attachment A. <br /> CONCLUSIONS <br /> Overall, data from the first month of the pilot study is encouraging. Data from boring P1 <br /> and field measurements of vapors have provided the most positive result, both indicating <br /> that the inoculated bacteria are present and active. <br /> Soil samples from P1 indicate a decrease in hydrocarbon contamination within 5-feet of <br /> VW-1. Inoculated bacteria are present in the soil at least 5 feet from-VW-1, but have not <br /> impacted groundwater in MW-14. The second month of monitoring should provide more <br /> conclusive data. <br /> If you have any questions or comments, please contact our office. <br /> Sincerely, <br /> GEOLOGICAL AUDIT SERVICES, INC. <br /> n <br /> ,�. <br /> ob Marty <br /> Project Manager <br /> Ordup I A.&Scrvicaa,Inc. 4 <br /> OFNIM o .dy enoitoriegR-9 <br />