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u <br /> 404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> 4,!5:� FAX(925)988-9673 <br /> Analytical www sequolalabs corn <br /> ettler Ryan,Inc -Dublin Protect Tosco <br /> 6747 Sierra Court Suite J Protect Number Tosco#6981 Reported <br /> Dublin CA,94568 Project Manager Scott POISton 05-Sep-01 18 11 <br /> Total Purgeable Hydrocarbons (C6-C12) and BTEX in Air by DHS LUFT - Quality Control <br /> Sequoia Analytical- Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 1H21003-EPA 5030B P/T <br /> LCS(1H21003-BS2) Prepared&Analyzed 23-Aug-01 <br /> Benzene 306 0 010 mg/in3 Air 4 00 765 65-120 <br /> Toluene 364 0 010 400 910 65-120 <br /> Ethylbenzene 348 0 010 400 87 0 65-120 <br /> Xylenes(total) 117 0 010 120 975 65-120 <br /> Surrogalea aa-Trrfluorotoluene 550 6 00 91 7 70-130 <br /> LCS(11121003-1353) Prepared&Analyzed 24-Aug-01 <br /> Benzen4 74 0 OLO mpc -- /m3 Air 4 00 118 65-120 <br /> Toluene 346 0 010 400 865 65-120 <br /> Ethylbenzene 336 0 010 4 00 840 65-120 <br /> Xylenes(total) 109 0 010 12 0 908 65420 _ <br /> Surrogate a a a-Tris luorotoluene 564 6 00 940 70-130 <br /> W-1p(1H21003-BSD1) Prepared&Analyzed 21-Aug-01 <br /> Benzene W 189 0 010 mg/ml Air 2 00 945 65-120 14 2 25 <br /> Toluene 192 0 010 2 00 960 65-120 926 25 <br /> Ethylbenzene 188 0 010 2 00 940 65-120 7 16 25 <br /> Xylenes(total) 624 0 010 6 00 lO4 65-120 1,5 2 25 <br /> Surrogate a a a-Tr fluorotoluene 582 6 00 970 70-130 <br /> Sequoia Analytical-Walnut Creek 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 ll of 12 <br />