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885 Jarvis Dr <br /> Sequoia Mogan Hill,CA 95037 <br /> (408)776.9600 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.can <br /> RS Corporation[1] Project: ARCO#548,Stockton,Ca ML30507 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 11/22/02 15:39 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified, BTEX by EPA 8021B - Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit /dotes <br /> Batch 2,118003-EPA 5030E IP/T] <br /> Blank(2418003-BLKI) Prepared&Analyzed: 10/18/02 <br /> Gasoline Range Organics(C6-C 10) ND 12 ppmv <br /> Benzene ND 0.16 " <br /> Toluene ND 0.13 " <br /> Ethylbenzene ND 0.12 " <br /> Xylenes(total) ND 0.12 " <br /> Methyl cert-butyl ether ND 0.69 " <br /> Surrogate:a,a,a-Trifluorotoluene 1.91 1,68 114 56-134 <br /> Laboratory Control Sample(2318003-BS1) Prepared&Analyzed: 10/18/02 <br /> Benzene 2.98 0.16 ppmv 3.14 94.9 62-125 <br /> Toluene 2.62 0.13 2.66 98.5 68-121 <br /> Ethylbenzene 2.28 0.12 2.31 98.7 75-125 <br /> �lenes(total) 6.61 0.12 692 95.5 76-121 <br /> Surrogate:a,a,a-Tris luorotoluene 1.71 1,68 102 56-134 <br /> Laboratory Control Sample(2418003-BS2) Prepared&Analyzed: 10/18/02 <br /> Gasoline Range Organics(C6-C10) 55.3 12 ppmv 70.9 78.0 65-142 <br /> Surrogate:a,a,a-Triuorotoluene 2.21 1.68 132 56-134 <br /> I <br /> i <br /> i <br /> i <br /> Sequoia 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 /> 5of8 <br />