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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6N8 <br /> www,sequoialabs.co n <br /> URS Corporation[11 Project: ARCO#548,Stockton,Ca MLK0692 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 12/02/02 13:43 <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 Leel Result %REC Limits RPD Limit Notes <br /> Batch 2K22004-EPA 5030B Pfl <br /> Blank(2K22004-BLK1) Prepared&Analyzed: 11/22/02 <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 ten-butyl ether ND 0.69 " <br /> Surrogate:a,a a-Trifluorotoluene 1.83 " 1.68 109 56-134 <br /> Laboratory Control Sample(2K22004-BS1) Prepared&Analyzed: 11/22/02 <br /> Benzene 3.54 0.16 ppmv 3.14 113 62-125 <br /> Toluene 2.98 0.13 2.66 112 68-121 <br /> ,Ethylbenzene 2.46 0.12 2.31 106 75-125 <br /> Xylenes(total) 7.88 0.12 6.92 114 76-121 <br /> Surrogate:a,a,a-Trifluorotoluene 1.87 1.718 111 56-134 <br /> Laboratory Control Sample(2K22004-BS2) Prepared&Analyzed: 11/22/02 <br /> Gasoline Range Organics(C6-C 10) 77.4 12 ppmv 70.9 109 65-142 <br /> Surrogate:a,a,a-Triuorotoluene 2.87 1.68 171 56-134 S-02 <br /> Laboratory Control Sample Dup(2K22004-BSD1) Prepared: 11/22/02 Analyzed: 11/23/02 <br /> Benzene 3.51 0.16 ppmv 3.14 112 62-125 0.851 31 <br /> Toluene 2.97 0.13 2.66 II2 68-121 0.336 29 <br /> Ethylbenzene 2.47 0.12 2.31 107 75-125 0.406 32 <br /> Xylenes(total) 8.00 0.12 6.92 116 76-121 1.51 29 <br /> Surrogate:a,a,a-Trifluorotoluene 1.61 1.68 95.8 56-134 <br /> Laboratory Control Sample Dup(2K22004-BSD2) Prepared: 11/22/02 Analyzed: 11/23/02 <br /> Gasoline Range Organics(C6-C 10) 71.3 12 ppmv 70.9 101 65-142 6.20 50 <br /> Surrogate:a,a,a-Tris luorotoluene 2.49 1.68 148 56-134 S-02 <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 /> 5 of 9 <br />