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' 22 May 2000 . <br /> • AGE-NC Project No. 98-0432 <br /> Page 3 of 3 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation: <br />' The prevailing ground water flow direction at the site is generally north/northeast. <br /> • TPH was detected in two ground water wells at the site. <br /> MTBE was detected in ground water samples at the site during this monitoring event. The <br /> concentrations of MTBE detected in well MW-1 have tripled over the last quarter and <br />' concentrations of MTBE detected in well MW-2 have doubled over the same. The detected <br /> MTBE concentrations exceed the State of California maximum contaminant level (MCL) of <br /> 14 ,ugll. <br /> 5.0. RECOMMENDATIONS <br />' Based on the results of this investi ation, AGE recommends: <br /> • A quarterly monitoring event should be scheduled for August 2000. <br /> • Preparation of a work plan for additional assessment of MTBE in soil and ground water. <br /> Additionally, to control the off-site migration of MTBE, interim plume control should be <br /> considered. <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities. The findings were based mainly <br /> upon analytical results provided by an independent laboratory. Evaluations of the <br /> geologic/hydrogeologic conditions at the site for the purpose of this investigation are made from a <br /> limited number of available data points (i.e. ground water samples), and subsurface conditions may <br />' vary away from these data points. No other warranty, expressed or implied, is made as to the <br /> professional recommendations contained in this report. <br /> Advanced GeoEnvirnnmental,Inc. <br />