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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-4600 <br /> Analytical <br /> FAX(40$)782-6308 <br /> www.sequoialabs.com <br /> tratus Environmental Inc, Project: ARCO 45469,Stockton,CA MLL0441 <br /> 30 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Fay Johnson 01/07/03 12:15 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015E modified - 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 2L21003-EPA 5030B [P/T] <br /> Matrix Spike(2L21003-MS1) Source:MLL0369-02 Prepared&Analyzed: 12/21/02 <br /> Surrogate:a,a,a-Trifluorotoluene 8.24 ug/1 10.0 82.4 55-142 <br /> Matrix Spike Dup(2L21003-MSD1) -- Source:MLL0369-02 Prepared&Analyzed: 12/21/02 <br /> Gasoline Range Organics(C6-C10) 426 50 ug/I 550 ND 77.5 62-134 5.03 41 <br /> Surrogate:a,a,a-Trifluorotoluene 7.68 10.0 76.8 55-142 <br /> Batch 2L24003-EPA 5030B [PIT] <br /> Blank(2L24003-BLKI) Prepared&Analyzed: 12/24/02 <br /> Gasoline Range Organics(C6-C 10) ND 50 ug/1 <br /> Oogute:a,a,a-Trifluorotoluene 8.82 10.0 88.2 55-142 <br /> Laboratory Control Sample(2L24003-BS2) Prepared&Analyzed: 12/24102 <br /> g/l _ <br /> Gasoline Range Organics(C6-C10) 234 50 u � _ 250 93.6 62-134 <br /> Surrogate:a,a,a-Trifluorotoluene 10.3 10.0 103 55-142 <br /> Matrix Spike(2L24003-MS1) Source:NML0550-05 Prepared&Analyzed: 12/24/02 <br /> Gasoline lunge Organics(C6-C 10) 461 50 ug/l 550 ND 83.8 62-134 <br /> Surrogate:a,a,a-Trifluorotoluene 8.46 10.0 84.6 55-142 <br /> Matrix Spike Dup(2L24003-MSD1) -Source:MLL0550-05 Prepared&Analyzed: 12/24/02 <br /> Gasoline Range Organics(C6-C10) 446 y 50 ugll 550 ND 81.1 62-134 3.31 41 <br /> Surrogate:a,a,a-Trfluorotoluene 10.1 10.0 101 55-142 <br /> Batch 2L27003-EPA 5030B [PIT] <br /> Blank(2L27003-BLKI) Prepared&Analyzed: 12/27/02 <br /> Gasoline Range Organics(C6-C 10) ND 50 ug/l <br /> Surrogate:a,a,a-Trifluorotoluene 9.95 10.0 99.5 55-142 <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 13 of 20 <br />