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404 N Wiget Lane <br /> Walnut Creek,CA 94598 <br /> l Sequoia (925)988-9600 <br /> FAX(925)988-9673 <br /> Analytical www sequolalabs corn <br /> Cettler Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosco#6981 Reported <br /> Dublin CA,94568 Project Manager Scott Polston 10-Jul-01 11 18 <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 Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1 F22003- EPA 5030B PIT <br /> Blank(1F22003-BLKI) Prepared&Analyzed 22-Jun-01 <br /> Purgeable Hydrocarbons ND 10 mg/ml Air <br /> Benzene ND 010 " <br /> Toluene ND 010 " <br /> Ethylbenzene ND 010 " <br /> Xylenes(total) ND 0 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate a a a-Triuorotoluene 548 600 913 70-130 <br /> Blank(IF22003-BLK2) Prepared&Analyzed 25-Jun-01 <br /> Purgeable Hydrocarbons ND 10 mg/ml Air <br /> Benzene ND 010 " <br /> 0yene <br /> ND 010 " <br /> lbenzene ND 010 " <br /> Xylenes(total) ND 0 10 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Surrogate a a,a-Triuorotoluene 5 94 600 990 70-130 <br /> LCS(IF22003-BSI) Prepared 22-Jun-01 Analyzed 27-Jun-01 <br /> Benzene 2 18 0 10 mg/ml Air 200 109 70-130 <br /> Toluene 220 010 200 110 70-130 <br /> Ethylbenzene 2 22 010 200 111 70-130 <br /> Xylenes(total) 6 94 010 600 116 70-130 <br /> Surrogate a,a a-Tr fluorotoluene 5 38 600 89 7 70-130 <br /> LCS(1F22003-BS2) Prepared&Analyzed 25-Jun-01 <br /> Benzene 449 0 10 mg/ml Air 400 112 70-130 <br /> Toluene 3 60 010 400 900 70-130 <br /> Ethylbenzene 3 58 010 400 895 70-130 <br /> Xylenes(total) 113 0 10 120 942 70-130 <br /> Surrogate aa a-Triuorotoluene 592 600 98 7 70-130 <br /> uoia 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 4 of 6 <br />