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-------------------- <br /> With regard to the potential for bioremediation occurring at the site, nitrate, sulfate and total <br /> alkalinity levels do not indicate a clear pattern consistent with the distribution of petroleum <br /> hydrocarbons present in the wells. However, the March 1997 data indicates that within the plume <br /> dissolved oxygen levels decrease, carbon dioxide levels have increased, and Eh readings are <br /> positive (indicating aerobic respiration). These trends indicate bioremediation is occurring in <br /> aerobic and anaerobic (possibly due to depletion of oxygen) environments. This can be verified <br /> with further groundwater monitoring at the site. <br /> If you have any questions or comments regarding this matter please contact our office. <br /> Respectfully, rti r <br /> Smith Technology Corporation 0 �, .S3S1't;,i;,.� <br /> 9-& <br /> ��� !1 <br /> Jeanne Homsey, P.E. c� 'NL;Q. G0 !410 r <br /> 4 f_XP. 12199 9 <br /> CA Registered Civil Engineer No. 47410 �� <br /> IL <br /> iV: <br /> EL <br /> WM/ str ti•:t� <br /> ATTACHMENTS: References <br /> Table 1, Summary of Groundwater Monitoring Data <br /> Table 2, Summary of Analytical Results-Groundwater <br /> Table 3, Summery of Geochemical Trends - Groundwater <br /> Figure 1, Site Vicinity Map <br /> Figure 2, Groundwater Gradient Map <br /> Appendix A, Groundwater Well Purge and Sample Logs <br /> Appendix B, Chain of Custody Records and Laboratory Analytical Results <br /> w:1951221Reportsl4QMR1996.doc 5 <br /> • <br /> SMTH <br />