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404 N Wiget Lane <br /> Sequoia Walnut Creek{925}988-49600 <br /> IDFAX(925)988-9673 <br /> Analytical www sec,uoialabs com <br /> Gettler Ryan,Inc -Dubhn Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosco#6981 Reported <br /> Dublin CA,94568 Project Manager Scott Polston O8-Jan-01 1143 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lnnit Units Level Result %REC Lumts RPD Limit Notes <br /> Batch lA02019 -EPA 503013 [PIT] <br /> LCS(1A02019-BS2) Prepared&Analyzed 22-Dec-00 <br /> Benzene 350 0 10 mg/ml Air 400 875 70-130 <br /> Toluene 350 010 400 875 70-130 <br /> Ethylbenzene 344 0 10 400 860 70-130 <br /> Xylenes(total) 102 0 10 12 0 950 70-130 <br /> Surrogate a a a-Tnfluorotoluene 558 600 93 0 70-130 <br /> LCS(1A02019-BS3) Prepared&Analyzed 23-Dec-00 <br /> Benzene 396 0 10 mg/ml Au 400 990 70-130 <br /> Toluene 410 0 10 400 102 70-130 <br /> Ethylbenzene 408 0 10 400 102 70-130 <br /> Xylenes(total) l2 1 010 120 101 70-130 <br /> WSgate a a a-Tnfluorotoluene 630 600 105 70-130 <br /> Dup(1A02019-ESDI) Prepared&Analyzed 21-Dec-00 Q-01 <br /> Benzene 137 0 10 mg/ml Air 200 685 70-130 636 25 <br /> Toluene 155 0 t0 200 775 70-t30 530 25 <br /> Ethylbenzene 133 010 200 665 70-130 725 25 <br /> Xylenes(total) 424 010 600 707 70-130 0 939 25 <br /> Surrogate aaa-Tris luorotoluene Soo 600 833 70-130 <br /> uoia Analytical-Walnut Creek The results in thrs report apply to the samples analyzed in accordance with the chain of <br /> custody document Tins analytical report must be reproduced in its entirety <br /> Page 6 of 9 <br />