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First Quarter 2005 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 two <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. Groundwater pump and treat may not be <br /> the best method for remediation of MTBE in groundwater at the lower concentrations that have recently <br /> been observed. Condor recommends the preparation of a Feasibility Study to evaluate at least three <br /> remedial alternatives, including groundwater pump and treat, for the remediation of MTBE impacted <br /> groundwater at the Site. <br /> LIMITATIONS <br /> This report was prepared under the direct supervision of a Registered Geologist in the State of California. <br /> The standard of care for all services performed or furnished by Condor is commensurate with the care and <br /> skill ordinarily used by a member of the environmental profession practicing under similar conditions at <br /> the same time in the same locality. Condor is not responsible for the accuracy and completeness of <br /> 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 /> (�L - GC <br /> Lee H. Morse, R.G. �� Donald F. Kresse, R.G., C.Hg.,R.E.A. <br /> Associate Geologist f,, LEE H. 6, Senior Environmental Hydrogeologist <br /> • o <br /> Attachments: No.7664 <br /> Figures <br /> Figure 1 Vici <br /> Figure 2 Site Map <br /> Figure 3 Groundwater Elevation Contours, March 22, 2005 <br /> Figure 4 MTBE Isoconcentration Contours in Groundwater, March 22 and 23, 2005 <br /> Figure 5 MTBE Concentrations vs. Time <br /> Site History <br /> Historical Groundwater Monitoring Data <br /> Groundwater Monitoring Field Forms <br /> C t-.rtificate...c of Aiii lvcPc nnri ('.linin of C-.iictnr1v P.-onrA <br /> . P:13000_prj13761 Boyett Manteca13761C Boyett Manteca Groundwater Monitoring\Reportsl1Q051QMR 1 Q05.dw <br /> y <br /> is CONDOR <br />