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i Dissolved oxygen (DO) was also measured in MW-14 and EW-1 throughout the last quarter of 1994 (Table 1) DO concentrations in both wells showed a decrease throughout the I quarter However, DO in EW-1 increased during the last sampling on December 19, 1994 The decrease in DO concentrations may indicate hydrocarbon consumption and correspond with overall decrease in hydrocarbon concentrations at the site between September and December 1994 4.2 Biological Activity in Soil ISamples collected during the November soil boring drilling were transmitted to Mr Hoeltgen Samples from boring BB-1 were also transmitted to an additional microbiologist for analysis (Dominic J Colasito via Applied Biotics) Soil samples analyzed by Mr Hoeltgen (Appendix B) indicate that between 3 and 4 species I of hydrocarbon degraders are present, primarily those of the Pseudomonas species The numbers present in bonng BB are somewhat low, however, because no hydrocarbons were detected in samples from boring BB, the low bacterial numbers are not surprising IOverall, the low numbers of bacteria in the soil correspond with the dramatic decrease of hydrocarbons encountered during drilling Results from Mr Dominic Colasrto correspond with the results provided by Mr Hoeltgen 4.3 Results of Soil Vapor Sampling and Analysis Organic vapor (OV) concentrations at the site continue the trend observed during the third I quarter of 1994 in each well, when OV readings are gieatest, the oxygen concentrations are low and carbon dioxide concentrations are high the converse is also true The relationslup between OV, oxygen and carbon dioxide continues to be predictable All soil vapor data ' is summarized in Table 2 No methane was detected in the vapor samples collected on October 10, 1994 ' Concentrations of nitrogen gas and oxygen were at or very close to atmospheric levels in each well Carbon dioxide was detected at 01 percent in most of the wells sampled However, slightly elevated concepti ations of 0 2, 1 1, 0 S and 0 7 percent were detected in ' wells VW-4, VW-5, VW-6 and VW-7, respectively The laboratory report and chain-of- custody is included in Appendix E ' 44 Petroleum Hydrocarbon Impacted Soil A total of 14 soil samples were analyzed for TPH as gasoline and BTE&X from borings P-3, ' P-4 and P-5 Samples were selected for analysis based upon field measurements of organic vapors using the PID No organic vapor readings were observed in samples from boring BB- 1, therefore no samples were submitted for analysis 0-6gwt Audit Sery 1, Q.." y R�p.,92 90 13G EVXQM6 3GEVXQM6 1