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1551 Industnal Road <br /> Se uoia San Carlos 23 90 <br /> q (650)232-9609600 <br /> a— ) <br /> ► Analytical wwscqFAX(650)232-9612612 <br /> www sequotalabs coin <br /> SRyan/Geostmtegies(l) Project Tosco(l)Sierra Court,Suite J Project Number Unocal SS#08671,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 12/06/01 15 09 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunit Units Level Result %REC Lunits RPD Limit Notes <br /> Batch 1110089-EPA 5030B PIT <br /> LCS(1110089-BS2) Prepared&Analyzed 11/28/01 <br /> Methyl tert-butyl ether 561 10 ugA 500 112 70-130 <br /> Surrogate 1,2-Dtchloroethane-d4 265 250 106 70-130 <br /> Surrogate Toluene-0 247 250 988 70-130 <br /> Matrix Spike(1110089-MSI) Source L111140-15 Prepared&Analyzed 11/26/01 <br /> Methyl tent-butyl ether 468 10 ug/l 500 ND 936 60-140 <br /> Surrogate 1,2-Dichloroethane-d4 480 300 960 70-130 <br /> Surrogate Toluene-d8 513 500 103 70-130 <br /> Matrix Spike Dup(1110089-MSDI) Source L111140-15 Prepared&Analyzed 11/26/01 <br /> Methyl tert-butyl ether 487 1 0 ug/l Soo ND 974 60-140 398 25 <br /> Surrogate 1,2-Dichloroethane-d4 508 500 102 70-130 <br /> Surrogate Toluene-d8 505 500 101 70-130 <br /> Ole <br /> la Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 9 of 10 <br />