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9!�) Sequoia 885 Jarvis Dr <br /> i Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.sequoialabs.com <br /> tratus Environmental Inc. Project: ARCO 45469,Stockton,CA MLK0837 <br /> 330 Cameron Fark 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 Pnrgeable 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 2LO4004-LPA 50308 [P/TI <br /> Matrix Spike Du (2L04004-MSD1) Source:MLK0865-03 Prepared: 12/04/02 Analyzed: 12/05/02 <br /> Ethylbenzene 8.57 0.50 ug/l 9.20 ND 93,2 77-130 13.5 21 <br /> Xylenes(total) 44.6 0.50 46.1 ND 96,7 78-128 12.8 21 <br /> Surrogate:a,a,a-Trffliuorotoluene 10.7 10.0 107 55-142 <br /> Batch 2LO5001 -LPA 5030B [PIT) <br /> Blank(2L05001-BLKI) Prepared&Analyzed: 12/05/02 <br /> Gasoline Range Organics(C6-C10) ND 0.50 mg/kg <br /> Benzene ND 0.0050 " <br /> Toluene ND 0.0050 " <br /> Ethylbenzene ND 0.0050 " <br /> Xylenes(total) ND 0.010 <br /> awwogate:a,a,a-Tris luorotoluene 00153 0.0200 76.5 64-145 <br /> Surrogate:4-Bromofluorobenzene 0.0219 0.0200 110 41-173 <br /> Laboratory Control Sample(2L05001-BS1) Prepared&Analyzed: 12/05/02 <br /> Benzene 0.0214 0.0050 mg/kg 0.0200 107 72-135 <br /> Toluene 0.0189 0.0050 0.0200 94.5 67-141 <br /> Ethylbenzene 0.0183 0.0050 0.0200 91.5 6$-I47 <br /> Xylenes(total) 0.0559 0.010 0.0600 93.2 62-149 <br /> Surrogate:a,a,a-Trir7uorotoluene 0.0137 0.0200 68.5 64-145 <br /> Surrogate:4-Bromofluorobenzene 0.0172 0.0200 86.0 41-173 <br /> Laboratory Control Sample(21,05001-BS2) Prepared&Analyzed: 12/05/02 <br /> Gasoline Range Organics(C6-C10) 1.04 0.50 mg/kg 1.00 104 63-143 <br /> Surrogate:a.a,a-Trifluorotoluene 0.0187 0.0200 93.5 64-145 <br /> Surrogate:4-Bromofluorobenzene 0.0237 0.0200 118 41-173 <br /> Sioia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Unless otherwise slated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Paye 9 of 13 <br />