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885 Jarvis Dr <br /> Sequoia Morgan Hill,87795037 <br /> (408)776-9600 <br /> :iWAnalytical FAX(408)782-6308 <br /> www.sequo0labscom <br /> URS Corporation[Arcoll 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,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 Notes <br /> Batch 3D17032-EPA 5030B IP/T] <br /> Blank(3D17032-BLKI) Prepared&Analyzed:04/17/03 <br /> Gasoline Range Organics(C6-C 10) ND 2.4 ppmv <br /> Benzene ND 0.031 " <br /> Toluene ND 0.027 " <br /> Ethylbenzene ND 0.023 " <br /> Xylenes(total) ND 0.023 " <br /> Methyl tert-butyl ether ND 0.14 " <br /> Surrogate:a,a,a-Tris luorotoluene 0.356 0.335 106 56-134 <br /> Laboratory Control Sample(3D17032-BS1) Prepared&Analyzed:04/17/03 <br /> Benzene 0.589 0.031 ppmv 0.627 93.9 62-125 <br /> Toluene 0.491 0.027 0.532 92.3 68-121 <br /> Ethylbenzene 0.444 0.023 0.462 96.1 75-125 <br /> Xylenes(total) 1.28 0.023 1.38 92.8 76-121 <br /> Surrogate:a,a,a-Trifluorototuene 0.248 0.335 74.0 56-134 <br /> Laboratory Control Sample(3DI7032-BS2) Prepared&Analyzed:04/17/03 <br /> Gasoline Range Organics(C6-CIO) 13.7 2.4 ppmv 14.2 96.5 65-142 <br /> Surrogate:a,a,a-Trifluorotoluene 0.185 0.335 85.1 56-134 <br /> Laboratory Control Sample Dup(3D17032-BSDI) Prepared&Analyzed:04/17/03 <br /> Benzene 0.609 0.031 ppmv 0.627 97.1 62-125 3.34 31 <br /> Toluene 0.505 0.027 0.532 94.9 68-121 2.81 29 <br /> Ethylbenzene 0.487 0.023 0A62 105 75-125 9.24 32 <br /> Xylenes(total) 1.34 0.023 1.38 97.1 76-121 4.58 29 <br /> Surrogate:a,a,a-Trifluorotoluene 0.355 0.335 106 56-134 <br /> Laboratory Control Sample Dup(3DI7032-BSD2) Prepared&Analyzed:04/17/03 <br /> Gasoline Range Organics(C6-C10) 13.9 2.4 ppmv 14.2 97.9 65-142 1.45 50 <br /> Surrogate:a,a,a-Triuorotoluene 0.385 0.335 115 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 he reproduced in its entirety. <br /> 5 of 9 <br />