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819 Sinker Ave Ste 8 <br /> Sacramento,CA 95834 <br /> Sequoia (916)921-9600 <br /> INW Analytical wwseq 6ialabs 100 <br /> www sequpialabs com <br /> G yan-Dublin Project Former Unocal 0187,Stockton,CA S302221 <br /> 6747 Sierra Court,Ste J Project Number N/A Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 02/28/03 19 02 <br /> Volatile Organic Compounds 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 3020233-EPA 5030B PIT <br /> Blank(3020233-BLKI) Prepared&Analyzed 02/18/03 <br /> Blank(3020233-BLK2) Prepared&Analyzed 02/19/03 <br /> Tert-butyl alcohol ND 50 ug/1 <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl teii butyl ether ND 050 <br /> Tert-amyl methyl ether <br /> ND 050 " <br /> Ethanol ND So " <br /> Surrogate 1 1-DCA-d4 290 250 116 60-140 <br /> Laborator Control Sam le(3020233-BS]) Prepared&Analyzed 02/18/03 <br /> M rt-bury]ether <br /> 174 050 ug/1 224 78 60-140 <br /> Surrogate 1,1-DC4-d4 208 250 83 60-140 <br /> Laboratory Control Sample(3020233-BS2) Prepared&Analyzed 02/19/03 <br /> Methyl tertbutyl ether 209 050 ugA 224 93 60-140 <br /> Surrogate 1 2-DCA-d4 291 It 250 116 60-140 <br /> Matnx Spike(3020233-MS1) Source S302218-12 Prepared 02/18/03 Analyzed 02/19/03 <br /> Methyl tert-butyl ether 204 050 ug/1 224 ND 91 60-140 <br /> Surrogate 1 1-DC4-d4 238 It 250 103 60-140 <br /> Matrix Spike Du (3020233-MSD]) Source S302218-12 Prepared 02/18/03 Analyzed 02/19/03 <br /> Methyl lert-butyl ether 220 0 50 ugA 224 ND 98 60-140 8 25 <br /> Surrogate 1 2-DCA-d4 239 250 104 60-140 <br /> Batch 3020263- EPA 5030B JPIT <br /> Blank(3020263-BLK1) Prepared 02/19/03 Analyzed 02/20/03 <br /> Tert-Butyl alcohol ND 50 ugA <br /> Wow 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 woet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 30 of 33 <br />