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885 Jarvis Dr <br /> 4D. Sequoia Mcrgan Hill,CA 95037 <br /> IWQpF Analytical FAX(408)776-9600 <br /> 408 782-6308 <br /> www.sequoialabs.catn <br /> atus Environmental Inc. Project: ARCO 45469,Stockton,CA MMA0406 <br /> 30 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 02/11/03 14:07 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified,BT]EX by EPA 8021B - Quality Control <br /> Sequoia Analytical - Morgan Mill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3A22004-EPA 5030B ]PIT] <br /> Matrix Spike Dup(3A22004-MSD]) Source:MMA0463-08 Prepared&Analyzed:01/22/03 <br /> Ethylbenzene 11.1 0.50 ug/l 9.80 ND 113 77-130 14,3 21 <br /> Xylenes(total) 55,0 0.50 47.9 ND 115 78-128 9.32 21 <br /> Surrogate:a,a,a-Trifluorotoluene 14.3 10.0 243 55-142 QM-07 <br /> Batch 3A28002-EPA 5030B PIT <br /> Blank(3A28002-BLKI) Prepared&Analyzed:01/28/03 <br /> Gasoline Range Organics(C6-C 10) ND 50 ug/l <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> X lens(total) ND 0.50 " <br /> Surrogate:a,a,a-Trifluorotoluene 9.75 10.0 97.5 55-142 <br /> Laboratory Control Sample(3A28002-BSI) Prepared&Analyzed:01/28/03 <br /> Benzene 8.78 0.50 ug/l 10.0 87.8 68-140 <br /> Toluene 8.88 0.50 10.0 88.8 76-127 <br /> Ethylbenzene 9.91 0.50 10.0 99.1 77-130 <br /> Xylenes(total) 28.9 0.50 30.0 96.3 78-128 <br /> Surrogate:a,a,a-TriJluorotoluene 9.80 10.0 98.0 55-141 <br /> Laboratory Control Sample(3A28002-BS2) Prepared&Analyzed:01/28/03 <br /> Gasoline Range Organics(C6-C 10) 253 50 ug/1 250 101 62-134 <br /> Surrogate:a,a,a-TriJluorotoluene 10.4 10.0 104 55-142 <br /> Matrix Spike(3A28002-MSI) Source: MMA0406-03 Prepared&Analyzed: 01/28/03 <br /> Gasoline Range Organics(C6-C10) 496 50 ugA 550 ND 90,2 62-134 <br /> Benzene 10.1 0.50 6.80 ND 143 68-140 QM-07 <br /> Toluene 36.1 0.50 41.0 ND 88.0 76-127 <br /> Ethylbenzene 9.42 0.50 9.80 ND 96.1 77-130 Q-23a <br /> Xylenes(total) 45.4 0.50 47.9 ND 94.8 78-128 Q-23 <br /> �uoia Analytical -Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> 20 of 34 <br />