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4D Sequoia 885 Jarvis Dr <br /> IVMcrgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.r-quoialabs.com <br /> tratus Environmental Inc. Project: ARCO 45469, Stockton,CA MLL0441 <br /> 330 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469, Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 01/07/03 12:15 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified - Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Ana] toReporting Spike Source %REC RPD <br /> Y Result Limit Units Level Result °/aREC Limits RPD Limit Notes <br /> Batch 2L21001 -EPA 5030B [P/Tl <br /> Blank(2L21001-BLKI) Prepared&Analyzed: 12/21/02 <br /> Gasoline Range Organics(C6-C10) ND 50 ug/l <br /> Surrogate:a,a,a-Tris luorotoluene 8.81 10.0 88.1 55-142 <br /> Laboratog Control Sam le(2L21001-BS2) Prepared&Analyzed: 12/21/02 <br /> Gasoline Range Organics(C6-C10) 233 50 ug/1 250 93.2 62-134 <br /> Surrogate:a,a,a-Trifluorotoluene 8.93 10.0 89.3 55-142 <br /> Matrix Spike(2L21001-MSI) Source:MLL0369-10 Prepared&Analyzed: 12/21/02 <br /> Gasoline Range Organics(C6-C 10) 257 50 ug/l 550 ND 46.7 62-134 QM-07 <br /> gate:a,a,a-Trifluorototuene 8.05 10.0 80.5 55-142 <br /> Matrix Spike Dup(2L21001-MSDI) Source:MLL0369-10 Prepared&Analyzed: 12/21/02 <br /> Gasoline Range Organics(C6-C 10) 391 50 ug/l 550 ND 71,1 62-134 41.4 41 QM-07 <br /> Surrogate:a,a,a-Triuorotoluene 8.72 10.0 87.2 55-142 <br /> Batch 2L21003-EPA 5030B PIT <br /> Blank(2L21003-BLKI) Prepared&Analyzed: 12/21/02 <br /> Gasoline Range Organics(C6-C10) ND 50 ug/l <br /> Surrogate:a,a,a-Tris luorotoluene 7.39 10.0 73.9 55-142 <br /> Laboratory Control Sample(2L21003-BS2) Prepared&Analyzed: 12/21/02 <br /> Gasoline Range Organics(C6-C 10) 209 50 ug/l 250 83.6 62-134 <br /> Surrogate:a,a,a-Trifluorotoluene 8.15 „ 10.0 81.5 55-142 <br /> Matrix Spike(2L21003-MSI) Source:MLL0369-02 Prepared&Analyzed: 12/21/02 <br /> Gasoline Range Organics(C6-C10) 448 50 ug/l 550 ND 81.5 62-134 <br /> 10oia 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 12 of 20 <br />