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0 C A M B R I A <br /> samples from all three wells at this site have been analyzed for fuel oxygenates (including <br /> ethanol and methanol) and lead scavengers since April 1998 The majority of the analytica] <br /> findings for these analyses have been non-detect (below the detection limit) There have been <br /> some low sporadic detections of some fuel oxygenates, but no concentration trend or pattern has <br /> developed in any of the wells We feel that continued quarterly analysis for these compounds is <br /> not warranted and that annual analysis is sufficient to monitor for any change in concentration <br /> Cambria proposes that analysis for fuel oxygenates (other than methyl tertiary butyl ether <br /> [MTBE]) and lead scavengers be performed annually Analysis for MTBE will continue to be <br /> done quarterly in all wells Cambria will implement this change in analysis after receiving <br /> approval from San Joaquin County Environmental Health Department <br /> CLOSING <br /> If you have any questions regarding the contents of this document, please call Joe Neely at <br /> (707) 933-2361 <br /> Sincerely, <br /> . Cambria Environmental Technology, Inc <br /> NO; of-c— <br /> Lisa Summers <br /> Staff Scientist <br /> ED GF <br /> QH W tiF00 <br /> Joe W Neely, RG <br /> Senior Project Geologist No 6927 <br /> RG 6927 <br /> Attachments <br /> Table I Additional Groundwater Analytical Data <br /> Figure 1 Site Vicinity/Well Survey Map <br /> Figure 2 Groundwater Contour/Chemical Concentration Map <br /> Appendix A Blaine Groundwater Monitoring Report <br /> • cc Ms Karen Petryna, Shell Oil Products US <br /> 0323 2 <br />