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1551 I ndusinal Road <br /> Sequoia SanC(6�S0s 23 %00 <br /> ,!D <br /> t )zsz 96oa <br /> FAX(650)232-9612 <br /> WoAnalytical www scquomlabs com <br /> Wer-Rvan/Geostrategies(1) Project Unocal(4) <br /> 6747 Sierra Court.Suite J Project Number Unocal SS#5098 Stockton CA Reported* <br /> Dublin CA 94568 Project Manager Deanna Harding 01/01/02 11 05 <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> lAnalvte Result Limit Umts Level Result %REC Limits RPD Limit Notes <br /> Batch 1120032 EPA 5030B IP/l-1 <br /> Matrix Spike(1120032-MSI) Source L112030-22 Prepared& Analyzed 12/07/01 <br /> Benzene 532 1 0 ug/l 500 ND 106 60-140 <br /> Toluene 507 1 0 500 ND 101 60-140 <br /> Methvl tert-butvl ether 52 3 1 0 Soo ND 105 60-140 <br /> Surrogate I 1-Dichloroethaiie-0 262 250 105 70-130 <br /> Surrogate Toluene-d8 243 " 25 0 971 70-130 <br /> Surrogate 4-BFB 234 250 93 6 70-130 <br /> Matrix Spike Dup(1120032-A7SD1) Source 1,112030-22 Prepared& Analyzed 12/07/01 <br /> Benzene 533 1 0 ug/l 500 ND 107 60-140 0 188 25 <br /> Toluene 496 1 0 500 ND 992 60-140 2 19 25 <br /> Methyl ten-butyl ether $02 10 500 ND 100 60-140 4 10 25 <br /> Surrogate 1,2-Dichloroethane-d4 263 25 0 105 70-130 <br /> rate Toluene-d8 247 ., 250 988 70-130 <br /> ate 4-BFB 14 7 250 98 8 70-130 <br /> ola Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chatty of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 33 of 34 <br />