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Sequoia Walnut <br /> N WlLane <br /> t Creek CAA 94598 <br /> (925)988-9600 <br /> Analytical www <br /> 988-%73 <br /> sequequolalabs corn <br /> Gettler Rvan Inc -Dublin Project Tosco <br /> 6747`-erm Court Suite l Project Number Tosco ay 11 192 Reported <br /> Dublin CA,94568 Project Manager Doug Lee 04-Sep-01 07 28 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Anal%te Result Limit Units Level Result %REC Limits RPD Limit 'dotes <br /> Batch 1 H29010- EPA 5030B tP/T) <br /> LCS OH29010-BS2) Prepared R Analyzed 30-Aug-01 <br /> f.teth%l ten-butvi ether(MTBE) 60 4 2 0 ug/1 Soo 121 70-130 <br /> Surrogate Dihi omofluoromernane 488 500 976 50-150 <br /> Surrogate 12-Lichwroeihahe-d4 45 0 500 900 50-150 <br /> Nlatria Spike(IH29010-MSI) Source W'108311-03 Prepared 29-Aug-01 Analyzed 30-Aug-01 <br /> �7eth�1 ten-bun 1 ether(MTBE) 112 20 ug/l Soo 55 114 60-150 <br /> Sun ogare tJrbromo?uornniethane --- <br /> 489 500 978 SO-150 <br /> Sarrogare 1 2-Dirhloroeihane-d4 49) .500 990 50-150 <br /> Matrix Spike Dup(IH29010-MSDI) Source N%108311-03 Prepared 29-Aug-01Anahzed 30-Aug-01 <br /> Methvi tern-bury)ether(M7 BE) T 110 20 ugA 500 55 110 60-150 1 80 25 <br /> S tare Drbronro�uoromPihaire 4 495 500 990 50-150 <br /> J are 1 2-Dichloroeihane-d4 i0 9 500 102 50-150 <br /> is Analytical - Walnut Creek The results in this report apply to the samples anal}.ed in accordance with the chain of <br /> custodi document This analytical report must be reproduced in its entiret) <br /> Page 10 of 12 <br />