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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 9583.4 <br /> (916)921-9C)OO <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs com <br /> Gettler-Ryan-Dublin Project Unocal 0187, Stockton,CA <br /> 6747 Sierra Court Ste J Project Number C-Sparge Test Reported <br /> Dublin CA,94568 Project Manager P LeCheminant 03/14/01 15 29 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Unus Level Result %REC Limits RPD Limit Notes <br /> Batch 1030124- EPA 5030B(P/T) <br /> Blank(1030124-BLKI) Prepared&Analyzed 03/12/01 <br /> Purgeable Hydrocarbons ND 500 ug/I <br /> Benzene ND 0 500 " <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 " <br /> Methyl tert-butyl ether ND 250 <br /> Surrogate a a a-Triuorotoluene 720 100 720 60-140 <br /> LCS(1030124-BSI) Prepared&Analyzed 03/12/01 <br /> Benzene 958 0 500 ug/l too 958 70-130 <br /> ene 939 0 500 100 989 70-130 <br /> [benzene 103 0 500 10 0 103 70-130 <br /> Xylenes(total) 31 5 0 500 300 105 70-130 <br /> Methyl tent-butyl ether 977 250 10 0 977 70-130 <br /> Surrogate a a a-Tr fluorotoluene 693 100 693 60-140 <br /> Matrix Spike(1030124-MSI) Source S103141-08 Prepared&Analyzed 03/12/01 <br /> Benzene 857 0 500 ug/l 100 ND 85 7 60-140 <br /> Toluene 885 0 500 100 ND 88 5 60-140 <br /> Ethylbenzene 939 0 500 100 ND 93 9 60-140 <br /> Xylenes(total) 28 2 0 500 300 ND 940 60-140 <br /> Methyl tert-butyl ether 114 250 100 ND 114 60-140 <br /> Surrogate a a a-Trifluorotoluene 668 100 668 60-140 <br /> Matrix Spike Dup(1030124-MSDI) Source 5103141-08 Prepared&Analyzed 03/12/01 <br /> Benzene 576 0 500 ug/l 100 ND 576 60-140 392 25 Q-02 <br /> Toluene 597 0 500 100 ND 597 60-140 389 25 Q-02 <br /> Ethylbenzene 622 0 500 100 ND 62 2 60-140 406 25 Q-02 <br /> Xylenes(total) 193 0 500 300 ND 643 60-140 37 5 25 Q-02 <br /> Methyl tert-butyl ether 128 250 100 ND 128 60-140 11 6 25 <br /> Surrogate a a a-Trifluorotoluene 4 19 100 419 60-140 Q-02 <br /> equota Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with tke chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> p1ge 5 of 6 <br />