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$85 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> Analytical FAX(08}7gz�g <br /> AWL www.sequoialabs.cou <br /> URS CorpOration f 11 Project: ARCO#548,Stockton,Ca <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 10/09/02 08:29 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified,BTEXM by EPA 8021B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source °/aREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2127003-EPA 50308[P/TI <br /> Blank(2127003-BLK1) Prepared&Analyzed:09/27/02 <br /> Gasoline Range Organics(C6-C10) ND 50 ug/1 <br /> Gasoline Range Organics(C6-C10) ND 50 mg/ml Air <br /> Benzene ND 0.50 " <br /> Benzene ND 0.50 ug/1 <br /> Toluene ND 0.50 " <br /> Toluene ND 0.50 mg/ml Air <br /> Etbylbenzene ND 0.50 ugA <br /> Ethylbenzene ND 0.50 mg/m'Air <br /> Xylenes(total) ND 0-50 1. <br /> Xylenes(total) ND 0.50 ugA <br /> Methyl tert-butyl ether ND 2.5 mg/m'Air <br /> Methyl tert-butyl ether ND 2.5 ugll <br /> U <br /> rrogate:a,a,a-Trifluorotoluene 9.70 10.0 97.0 70-130 <br /> arrogate:a,a,a-Try7uorotoluene 9.70 mg/m'Air 10.0 9TO 70-130 <br /> LCS(2I27003-BSI) Prepared&Analyzed:09/27/_02 <br /> Benzene 9.46 0.50 ug/I 10.0 " 94.6 70-130 <br /> Benzene 9.46 0.50 mg/m'Air 10.0 94.6 70-130 <br /> Toluene 9.78 0.50 U84 10.0 97.8 70-130 <br /> Toluene 9.78 0.50 mg/m'Air 10.0 97.8 70-130 <br /> Ethylbenzene 9.73 0.50 10.0 97.3 70-130 <br /> Ethylbenzene 9.73 0.50 ug/l 10.0 97.3 70-130 <br /> Xylenes(total) 28.3 0.50 mg/m'Air 30.0 94.3 70-130 <br /> Xylenes(total) 28.3 0.50 ug/l 30.0 94.3 70-130 <br /> Surrogate:-a,a,a-Trifl'uorotoluene 10.8 mg/m'Air 10.0 108 70-130 <br /> Surrogate:a,a,a-Tris luorotoluene 10.8 ug/l 10.0 108 70-130 <br /> LCS(2127003-BS2) Prepared&Analyzed:09/27/02 <br /> Gasoline Range Organics(C6-C10) 208 50 ug/l 250 83.2 70-130 _ <br /> Gasoline Range Organics(C6-C10) 208 50 mg/ml Air 250 83.2 70-130 <br /> Surrogate:a,a,a-Trifluoroioluene 11.5 ug/l 10.0 115 70-130 <br /> Surrogate:a,a,a-Trifluorotoluene 11.5 mg/m'Air 10.0 115 70-130 <br /> .Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. This analytical report must be reproduced in its entirety. <br /> 5 of 8 <br />