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885 Jarvis Dr <br /> Sequoia Ma gan Hill,CA 95037 <br /> (408)776-9600 <br /> IW Analytical <br /> FAX(408)782fi308 <br /> wxw.sequoialabsxcm <br /> URS Corporation[1l Project: ARCO#434 MLJ0673 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#434 Reported: <br /> Sacramento CA,95833 Project Manager: Vem Elarth 11/12/02 10:24 <br /> Total Purgeable Hydrocarbons(C6-C10) by EPA 8015B modified -Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source a/aREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2J28013-EPA 5030B [P/Tl <br /> Blank(2J28013-BLKI) Prepared&Analyzed: 10/28/02 <br /> Gasoline Range Organics(C6-CIO) ND 0.50 mg/kg <br /> Surrogate:a,a,a-Tris luorotoluene 0.0186 0.0200 93.0 64-145 <br /> Laboratory Control Sample(2J28013-BS1) Prepared&Analyzed: 10/28/02 <br /> Gasoline Range Organics(C6-C 10) 1.00 0.50 mg/kg 1.00 100 63-143 <br /> Surrogate:a,a,a-Trifluorotoluene 0.0141 " 0.0200 120 64-145 <br /> Matrix Spike(2J28013-MSI) Source:MLJO673-10 Prepared&Analyzed: 10/28/02 <br /> Gasoline Range Organics(C6-C10) 0.689 0.50 mg/kg 1.10 ND 62.6 63-143 QM-07 <br /> Surrogate:a,a,a-Trlfluorotoluene 0.0229 0.0200 114 64-145 <br /> Matrix Spike Dup(2J28013-MSD1) Source:MLJ0673-10 _Prepared&Analyzed: 10/28/02 <br /> Gasoline Range Organics(C6-CIO) 0.836 0.50 mg/kg 1.10 NO 76.0 63-143 19.3 21 <br /> Surrogate:a,a,a-Trifiuorotoluene 0.0238 0.0200 119 64-145 <br /> Batch 2J29004-EPA 5030B[P/Tl <br /> Blank(2J29004-BLKI) Prepared&Analyzed: 10/29/02 <br /> Gasoline Range Organics(C6-CI0) NO 0.50 mg/kg <br /> Surrogate:a,a,a-Triiluorotoluene 0.0101 0.0200 100 64-145 <br /> Surrogate:4-BromoJluorobenzene 0.0186 0.0200 93.0 41-173 <br /> Laboratory Control Sample(2J29004-BS2) Prepared&Analyzed: 10/29/02 <br /> Gasoline Range Organics(C6-C10) 0.840 0.50 mg/kg 1.00 84.0 63-143 <br /> Surrogate:a,a,a-Triiluorotoluene 0.0155 0.0200 128 64-145 <br /> Surrogate:4-Bromo luorobemene 0.0204 0.0200 101 41-173 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stared,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> 12 of 16 <br />