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885 Jarvis Dr <br /> a_ _� Sequoia Mogan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical. FAX(408)762-6308 <br /> www.sequoialabs.can <br /> tus Environmental Inc. Project: ARCO#5469,Stockton,CA MLK0837 <br /> 0 Cameron Park Dr., Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 12/23/02 10:37 <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 2LO5001 - EPA 5030B [P/Tl <br /> Matrix Spike(2L05001-MSI) Source: MLK0837-01 Prepared: 12/05/02 Analyzed: 12/06/02 <br /> Gasoline Range Organics(C6-C10) 0.824 0.50 mg/kg 1.10 ND 74.9 63-143 <br /> Benzene 0.0158 0.0050 0.0132 ND 120 72-135 <br /> Toluene 0.0749 0.0050 0.0794 ND 94.3 67-141 <br /> Bthylbenzene 0.0161 0.0050 0.0184 ND 87.5 68-147 <br /> Xylenes(total) 0.0824 0.010 0.0922 ND 89.4 62-149 <br /> Surrogate:a,a,a-Tris luorotoluene 0.0254 0.0200 127 64-145 <br /> Surrogate:4-Bromofluorobenzene 0.0291 0.0200 146 41-173 <br /> Matrix Spike Dup(2L05001-MSD1) Source. MLK0837-01 Prepared: 12/05/02 Analyzed: 12/06/02 <br /> Gasoline Range Organics(C6-C10) 1.02 0.50 mg/kg 1.10 ND 92.7 63-143 21.3 21 QM-07 <br /> Benzene 0.0190 0.0050 0.0132 ND 144 72-135 18.4 35 QM-07 <br /> S ne <br /> 0.0914 0.0050 0.0794 ND 115 67-141 19.8 18 QM-07 <br /> enzene 0.0200 0.0050 0.0184 ND 109 68-147 21.6 20 QM-07 <br /> Xylenes(total) 0.102 0.010 0.0922 ND 111 62-149 21.3 20 QM-07 <br /> Surrogate:a,a,a-Trifluorotoluene 0.0256 0.0200 128 64-145 QM-07 <br /> Surrogate:4-Bromofluorobenzene 0.0278 0.0200 139 41-173 <br /> oia 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 /> Page 10 of 13 <br />