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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> .. (408)776-9600 <br /> Analytical FAXequoi labs.c08 <br /> www.sequoalabs.com <br /> . URS Corporation[Arco l] Project ARCO#548,Stockton,Ca MMD0499 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: N!P Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 04/29/03 16:20 <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 °/uREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3D17032-EPA 5030B IP/T] <br /> Blank(3D17032-BLKI) Prepared&Analyzed:04/17/03 <br /> Gasoline Range Organics(C6-C10) ND 10 mg/ml Air <br /> Benzene ND 0.10 " <br /> Toluene ND 0.10 " <br /> Ethylbenzene ND 0.10 " <br /> Xylenes(total) ND 0.10 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Surrogate:a,a,a-Tris luorotoluene 1.13 1.00 106 56-134 <br /> Laboratory Control Sample(3DI7032-BSI) Prepared&Analyzed:04/17/03 <br /> Benzene 1.88 0.10 mg/ml Air 2.00 94.0 62-125 <br /> Toluene 1.85 0.10 2.00 92.5 68-121 <br /> Ethylbenzene 1.92 0.10 2.00 96.0 75-125 <br /> . Xylenes(total) 5.57 0.10 6.00 92.8 76-121 <br /> Surrogate:a,a,a-Tri.Jluorotoluene 1.48 2.00 74.0 56-134 <br /> i <br /> Laboratory Control Sample(3D17032-BS2) Prepared&Analyzed:04/17/03 <br /> Gasoline Range Organics(C6-C10) 48.4 10 mg/ml Air 50.0 96.8 65-I42 <br /> I <br /> Surrogate:a,a,a-Tris luorotoluene 1.70 2.00 85.0 56-134 <br /> Laboratory Control Sample Dup(3DI7032-BSDI) Prepared&Analyzed:04/17/03 <br /> Benzene 1.94 0.10 mg/ml Air 2.00 97.0 62-125 3.14 31 <br /> Toluene 1.90 0.10 2.00 95.0 68-121 2.67 29 <br /> Ethylbenzene 2.11 0.10 2.00 106 75-125 9.43 32 <br /> Xylenes(total) 5.82 0.10 6.00 97.0 76-I21 4.39 29 <br /> Surrogate:a,a,a-Trfluorotoluene 2.12 1.00 106 56-134 <br /> Laboratory Control Sample Dup(3D17032-BSD2) Prepared&Analyzed:04/17/03 <br /> Gasoline Range Organics(C6-Cl0) 48.9 10 mg/m'Air 50.0 97.8 65-142 1.03 50 <br /> Surrogate:a,a,a-Tilluorotoluene 2.30 1.00 115 56-134 <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 /> 7 of 9 <br /> I <br />