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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical. FAX(408)782-6308 <br /> www.sequoialabs.can <br /> tratus Environmental Inc. Project: ARCO 45469,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 /> I <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 2LO2001 -EPA 5030B [P/T] <br /> Laboratory Control Sample(2L02001-13S2) Prepared&Analyzed: 12/02/02 <br /> Gasoline Range Organics(C6-C10) 1.07 0.50 mg/kg 1.00 107 63-143 <br /> Surrogate:a,a,a-T'rii luorototuene 0.0252 0.0200 126 64-145 <br /> Surrogate:4-Bromofluorobenzene 0.0307 0.0200 154 41-173 <br /> Matrix S ike(ZL02001-MSI) Source.MLK0732-05 Prepared: 12/02/02 Analyzed: 12/03/02 <br /> Gasoline Range Organics(C6-C10) 0.985 0.50 mg/kg 1.10 ND 89.5 63-143 <br /> Benzene 0.0228 0.0050 0.0132 ND 173 72-135 QM-07 <br /> Toluene 0.117 0.0050 0.0794 ND 147 67-141 QM-07 <br /> Ethylbenzene 0.0236 0.0050 0.0184 ND 126 68-147 <br /> Xylenes(total) 0.121 0.010 0.0922 ND 131 62-149 <br /> S ogate:a,a,a-Trlfluorotoluene 0.0229 0.0200 114 64-145 <br /> gate:4-Bromofluorobenzene 0.0315 0.0200 Lib 41-173 <br /> Matrix Spike D u p(2L02001-MSD 1) Source:MLK0732-05 Prepared: 12/02/02 Analyzed: 12/03/02 <br /> Gasoline Range Organics(C6-C 10) 0.818 0.50 mg/kg 1.10 ND 74.4 63-143 18.5 21 <br /> Benzene 0.0194 0.0050 0.0132 ND 147 72-135 16.1 35 QM-07 <br /> Toluene 0.0957 0.0050 0.0794 ND 120 67-141 20.0 18 QM-07 <br /> Ethylbenzene 0.0199 0.0050 0.0184 ND 108 68-147 17.0 20 <br /> Xylenes(total) 0.102 0.010 0.0922 ND ill 62.149 17.0 20 <br /> Surrogate:a,a,a-Trifluorotoluene 0.0207 0.0200 104 64-145 <br /> Surrogate,4-Bromofluorobenzene 0.0325 0.0200 162 41-173 <br /> oia Analytical-Morgan Hill The results in this report apply to the samples analysed in accordance with the chain of <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report mast be reproduced in its entirety. <br /> Page 7 of 9 <br />