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Sequoia 819 Striker Avenue Suite 8 <br /> IN <br /> Sacramento, CA 95834 <br /> (916) 921-9600 <br /> Analytical <br /> FAX(916) 921-0100 <br /> December 20, 1999 <br /> IT Group, Inc <br /> 3939 Cambridge Road, Suite 20 <br /> Cameron Park, CA, 95682 <br /> Dear Pat Jimison <br /> Here are the findings for MTBE from the Arco 6100 projects submitted to Sequoia Analytical during the <br /> years 1992-1995 As requested, sample data from that time period was systematically recovered and <br /> reviewed for any MTBE levels Note that records prior to 9192 had been destroyed, so data you had <br /> requested from 1991 through most of 1992 no longer exist In addition, data requested from 3193 was <br /> unable to be located <br /> Methy-tert-butyl-ether as you know, has come under scrutiny in recent times as a potential ground <br /> water contaminant and as such is now routinely analyzed for, using appropriate methodology <br /> Unfortunately, at the time the samples in question were analyzed, MTBE was not an issue and <br /> therefore instrumentation was not calibrated to specifically look for this contaminant The results <br /> reported from the search Sequoia Analytical completed, are based on the retention time of the <br /> compound in question, and interpretation of several experienced senior analysts The results are <br /> qualitative for this reason but can be considered our best judgement under the circumstances <br /> We have included a table of the results and the chromatograms associated with the analysis for the <br /> samples requested If you have any questions regarding this report please feel free to contact me at <br /> 916.921-9600 <br /> Sincerely, <br /> V-1-el <br /> Ronald W Bobel <br /> Project Manager <br />