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819 Striker Ave Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> A T1 Utl�".9 1 FAX(916)921-0100 <br /> www sequuididon win <br /> Gettler-Ryan-Petaluma Project Tosco 11192,Stockton,CA 5212192 <br /> 1364 N McDowell Blvd Ste B2 Project Number NIA Reported <br /> Petaluma CA,94954 Protect Manager Dave Vossler 12/20/02 14 03 <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 2120184-EPA 5030B {P/Tl <br /> Laboratory Control Sample(2120184-BS3) Prepared&Analyzed 12/16/02 <br /> Methyl tent-butyl ether 00396 00050 mg/kg 00500 77 60-140 <br /> Surrogate 1 2-DCA-d4 00429 00500 86 60-140 <br /> Laboratory Control Sample(2120184-BS4) Prepared&Analyzed 12/16/02 <br /> Metbyl tert-butyl ether 00320 00050 mg/kg 00448 71 60-140 <br /> Surrogate 12-DCA d4 00432 00500 86 60-140 <br /> Matrix Spike(2120184-MS1) Source S212081-10 Prepared 12/12/02 Analyzed 12/14/02 <br /> Metbyl tert butyl ether 00485 00050 mg/kg 00500 ND 95 60-140 <br /> Surrogate 12-DCA d4 00491 " 0 0500 98 60-140 <br /> Matrix Spike(2120184-MS2) Source 5212087-10 Prepared 12/12/02 Analyzed 12/14/02 <br /> Methyl tert-butyl ether _ 00409 00050 mg/kg 00448 ND 89 60-140 <br /> Surrogate 12-DCA-d4 00476 " 00500 95 60-140 <br /> Matrix Spike Dup(2120184-MSD]) Source S212087-10 Prepared 12/12/02 Analyzed 12/14/02 <br /> Methyl tert-butyl ether 00489 00050 mg/kg 00500 ND 96 60-140 0 8 25 <br /> Surrogate 1 1-DCA-d4 00489 00500 98 60-140 <br /> Matrix Spike Dup(2120184-MSD2) Source S212087-10 Prepared 12/12/02 Analyzed 12/14/02 <br /> Methyl ten butyl ether 00400 00050 mg/kg 00448 ND 89 60 140 0 7 25 <br /> Suriogate 1 2-DCA-d4 00472 - - _ " 00500 94 60-140 <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 weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 10 <br />