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' 819 Striker Ave Ste 8 <br /> Sequoia Sacramento C2 95834 <br /> (916)9l 19600 <br /> Analytical FAX(916)9210100 <br /> www sequoialabs corn <br /> Weston Solutions,Inc-Walnut Creek Project San Joaquin HSA S401313 <br /> 1575 Treat Blvd,Ste 212 Project Number 4th Quarter Sampling Reported <br /> Walnut Creek CA,94596 Protect Manager Jessica Levine 01/28/04 13 41 <br /> MTBE by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />' Batch 4010180-EPA 5030B IP/TI <br /> Blank(4010180-BLK1) Prepared&Analyzed 01/16/04 <br /> Methyl tert-butyl ether ND 050 ug/1 <br /> Surrogate 1 2-DCA-d4 261 250 104 60-140 <br /> Laboratory Control Sample(4010180-BS1) Prepared&Analyzed 01/16/04 <br /> Methyl tert-butyl ether 06 050 ug/I 200 98 70-130 <br />' Surrogate 12 DCA-d4 246 250 98 60-140 <br /> Matrix Spike(4010180-MS1) Source S401248-12 Prepared&Analyzed 01/16/04 <br /> Methyl tert-butyl ether 187 050 ug/l 200 ND 94 60-140 <br /> Surrogate 1 2-DCA-d4 25 1 250 100 60-140 <br /> Matrix Spike Dup(4010180-MSDI) Source S40I248-12 Prepared&Analyzed 01/16/04 <br /> Methyl tett-butyl ether 18 8 050 ug/l 200 ND 94 60-140 05 25 <br /> Wrrogate <br /> 1 2-DCA d4 271 250 108 60-140 <br /> 1 <br /> ' Sequoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet iseight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 9 of 10 <br />