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' Bank of Stockton Page 5 <br /> Summer 1996 Quarterly Monitoring Report <br /> Project No 102 2 <br /> October 10, 1996 <br />' reveal hydrocarbon concentrations much more in line with the general trend of declining <br /> contaminant levels <br />' 3.0 CONCLUSIONS <br />' The following conclusions have been drawn regarding this quarterly groundwater <br /> sampling event <br />' • The direction of groundwater flow and gradient are consistent with prior <br /> monitoring events as reported by Geological Audit Services and Geological <br /> Technics Inc <br />' Monitoring well MW-1 has experienced a significant increase in the level of <br /> petroleum hydrocarbons since the March monitoring event <br />' • As shown in SummaryTable 2 there is a clear trend of gradually reducing levels <br /> g Y g <br /> of BTEX compounds with this present event being the most significant reversal of <br />' the trend since groundwater monitoring began It is suspected that this is a result <br /> of a recent high stand of groundwater contacting residual vadose zone soil <br /> contamination resulting in newly mobilized petroleum hydrocarbons which are <br /> now in the process of being dispersed and degraded <br /> I4.0 SIGNATURES AND CERTIFICATION <br /> This project was performed by Phase One Environmental Inc in accordance with <br /> I accepted geologic and hydrologic standards of the State of California accepted and in <br /> effect at the time of this investigation <br /> This report was prepared by <br /> Phase One Environmental Inc. <br /> STEPHEN K <br /> wWM <br /> Is No 4283 <br /> tephen M Lankfo f9lQF CAI�Fd `� <br /> California Registered Geologist #4283 <br /> Registered Environmental Assessor #4459 <br /> 2937 Veneman Ave ,#B240 Phase One Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0295 <br /> I <br />