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{ <br /> Second Quarter 2606 Groundwater Monitoring Report <br /> Boyett Petroleum,419 S. Main,Manteca,CA <br /> Page 4 <br /> Concentrations of MTBE in groundwater at the site have decreased significantly during the last three <br /> years, as shown on the graph in Figure 5, attached. There has also been a corresponding reduction in the <br /> estimated size of the MTBE plume during the same time period. The decrease in concentrations and the <br /> reduction in the estimated size of the plume suggest that intrinsic bioremediation has been taking place <br /> within the MTBE plume at the site. <br /> BTEX and TPH-G have not been detected in any of the site monitoring wells since December 2001. <br /> Condor recommends that all groundwater samples be analyzed for gasoline oxygenates/additives only. <br /> MTBE has not been detected in the groundwater samples collected from monitoring wells MW-2 and <br /> MW-6 for more than two years. The last time MTBE was detected in a water sample collected from <br /> monitoring well MW-8 was in March 2004. Since contaminants have not been detected in these three <br /> wells for eight or more quarters, Condor recommends that the sampling frequency for MW-2, MW-6, and <br /> MW-8 be reduced to once a year. <br /> LIMITATIONS <br /> This report was prepared under the direct supervision of a Professional Geologist in the State of <br /> California. The standard of care for all services performed or furnished by Condor is commensurate with <br /> the care and skill ordinarily used by a member of the environmental profession practicing under similar <br /> conditions at the same time in the same locality. Condor is not responsible for the accuracy and <br /> completeness of information collected and developed by others. <br /> This report was prepared for the sole use of Boyett Petroleum, and may not be used or relied upon by any <br /> other person(s) without the express written consent and authorization of Boyett Petroleum and Condor. if <br /> any changes are made or errors found in the information used for this report, the interpretations and <br /> conclusions contained herein shall not be considered valid unless the changes or errors are reviewed by <br /> Condor and either appropriately modified or re-approved in writing. Any questions regarding the content <br /> of this document should be addressed to Lee Morse at(209) 388-9601, <br /> Respectfully submitted, <br /> CONDOR EARTH TECHNOLOGIES, INC. <br /> RZ Sharma Lee H. Morse, P.G. <br /> Staff Geologist Associate Geologist Or1A1 GFS <br /> to <br /> 00 <br /> LEE H. MORSE <br /> 4 � <br /> No. 7654 Q- <br /> OF Cx� <br /> a.a CONDOR <br />