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Sequoia 8857arv5037 <br /> Ma�tn Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(409)782-6308 <br /> www.sequoialabs,com <br /> tus Environmental Inc. Project: ARCO#5469, Stockton,CA MLK0749 <br /> 30 Cameron Park Dr., Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 12/19/02 08:44 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified, BTEX by EPA 8021B - Quality Control <br /> Sequoia Analytical -Morgan )=Till <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2K26004-EPA 5030B PIT <br /> Blank(2K26004-BLKl) Prepared&Analyzed: 11/26/02 <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 /> Surrogate:a,a,a-Trifluorotoluene 0.0147 0.0200 73.5 64-145 <br /> Surrogate:4-Bromofluorobenzene 0.0123 0.0200 61.5 41-173 <br /> Laboratory Control Sample(2K26004-BS1) Prepared& Analyzed: 11/26/02 <br /> Benzene 0A187 0.0050 mg/kg 0.0200 93.5 72-135 <br /> Toluene 0.0189 0.0050 0.0200 94.5 67-141 <br /> Obenzene 0.0182 0.0050 0.0200 91.0 68-147 <br /> nes(total) 0.0585 0.010 0.0600 97.5 62-H9 <br /> Surrogate:a,a,a-Trifluorotoluene 0.0175 0.0200 87.5 64-145 <br /> Surrogate:4-Bromofluorobenzene 0.0119 0.0200 64.5 41-173 <br /> Laboratory Control Sample(2K26004-BS2) Prepared&Analyzed: 11/26/02 <br /> Gasoline Range Organics(C6-C10) 1.09 0.50 mg/kg 1.00 109 63-143 <br /> Surrogate:a,a,a-Trifluorotoluene 0.0217 " 0.0200 108 64-145 <br /> Surrogate:4-Bromofluorobenzene 0.0150 " 0.0200 75.0 41-173 <br /> Matrix Spike(2K26004-MSI) Source:MLK0482-06 Prepared: 11/26/02 Analyzed: 11/27/02 <br /> Gasoline Range Organics(C6-C10) 1.01 0.50 mg/kg 1.10 0.56 40.9 63-143 QM-07 <br /> Benzene 0.0187 0.0050 0.0132 ND 142 72-135 QM-07 <br /> Toluene 0.0935 0.0050 110.0794 ND 118 67-141 <br /> Ethylbenzene 0.0196 0.0050 0.0184 ND 107 68-147 <br /> Xylenes(total) 0.109 0.010 0.0922 ND 118 62-149 <br /> Surrogate:a,a,a-Triuorotoluene 0.0258 0.0200 129 64-145 <br /> Surrogate:4-Bromofluorobenzene 0.0162 0.0200 81.0 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 5 of 9 <br />