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Sequoia 885 Jarvis Drive <br /> Morgan Hill,CA 95037 <br /> Analylzcal. (408)776-9600 <br /> FAX(408)782-6308 ' <br /> www.sequoialabs.con <br /> URS Corporation[11 Project: ARCO#760,Lodi,CA. <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#760,Lodi,CA Reported: ' <br /> Sacramento CA,95833 Project Manager: Vern Elarth 10/24/02 08:51 <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 2J17004-EPA 5030B 1P/Tl <br /> Blank(2J17004-BLKI) Pre ared&Anal zed: 10/17/02 <br /> Gasoline Range Organics(C6-C10) ND 50 ug/I ' <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 ' <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:a,a,a-Tris luorotoluene 11.2 10.0 112 55-142 <br /> LCS(2J17004-BS1) Prepared&Analyzed: 10/17/02 ' <br /> Benzene 12.1 0.50 119/1 10.0 121 68-140 <br /> Toluene 11.3 0.50 10.0 113 76-127 <br /> Ethylbenzene 10.9 0.50 10.0 109 77-130 , <br /> Xylenes(total) 31.6 0.50 30.0 105 78-128 <br /> Surrogate:a,a,a-Trii luorotoluene 12.4 10.0 124 55-142 <br /> LCS(2J17004-BS2) Prepared&Analyzed 10/17/02 ' <br /> Gasoline Range Organics(C6 C10) 244 50 ugfl 250 97.6 62-134 <br /> Surrogate:a,a,a-Trifluorotoluene 16.0 11 10.0 160 55-142 <br /> 5-02 ' <br /> Matrix Spike(2117004-MSI) Source:MLJ0231-02 Prepared&Analyzed• 10/17/02 <br /> Gasoline Range Organics(C6-C10) 468 50 ug/1 550 ND 85.1 62-134 <br /> Benzene 7.69 0.50 6.60 ND 117 68-140 <br /> Toluene 39.0 0.50 39.7 ND 98.2 76-127 , <br /> Ethylbenzene 8.02 0.50 9.20 ND 87.2 77-130 <br /> Xylenes(total) 38.7 0.50 46.1 ND 83.9 78-128 <br /> Surrogate:a,a,a-Trifluorotoluene 15.7 10.0 157 55-142 ' <br /> QM-07 <br /> Matrix Spike Dup(2117004-MSD]) Source:MLJ0231-02 Prepared&Analyzed: 10/17/02 <br /> Gasoline Range Organics(C6 C10) 467 50 ug/l 550 ND 84.9 62-134 0.214 41 <br /> Benzene 7.56 0.50 6.60 ND 115 68-140 1.70 30 ' <br /> Toluene 38.8 0.50 " <br /> 39.7 ND 97.7 76-127 0.514 30 <br /> Ethylbenzene 7.85 0.50 9.20 ND 85.3 77-130 2.14 21 <br /> Xylenes(total) 37.9 0.50 46.1 ND 82.2 78-128 2.09 21 , <br /> Surrogate:a,a,a-Tris luorotoluene 12.6 10.0 126 55-142 <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 /> 4 of 6 ' <br />