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tz_ i Sequoia 885 Jarvis Dr <br /> Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.sequoialahs.ctan <br /> tratus Environmental Inc. Project: ARCO 45469, Stockton,CA <br /> 30 Cameron Park Dr.,Suite 550 MLK0837 <br /> Project Number: ARCO#5469, Stockton,CA Reported: <br /> Cameron Park CA, 95682 Project Manager: Jay Johnson 12/23/02 10:37 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified, BTEX by EPA 8021B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> FAnaly7te Reporting Spike Source %REC RPD <br /> Result Limit Units Level Result %REC Limits RFD Limit Notes <br /> Batch 2LO3002-EPA 5030B [P/TJ <br /> Blank(2L03002-BLKI) Prepared&Analyzed: 12/03/02 <br /> Gasoline Range Organics(C6-C 10) ND 50 ugh <br /> Benzene ND 0.50 <br /> Toluene ND 0.50 " <br /> Rthylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 <br /> Surrogate:a,a,a-Trifluorotoluene 10.9 10.0 109 55-142 <br /> Laboratory Control Sample(ZL03002-BSI) Prepared&Analyzed: 12/03/02 <br /> Benzene 10.5 0.50 ug/1 10.0 105 68-140 <br /> Toluene 10.8 0.50 11 10.0 108 76-127 <br /> Ethylbenzene 11.6 0.50 10.0 116 77-130 <br /> eves(total) 33.2 0.50 30.0 111 78-128 <br /> Surrogate:a.a,a-7'ri1luorotoluene 10.8 " 10.0 108 55-142 <br /> Laboratory Control Sample(2L03002-BS2) Prepared&Analyzed: 12/03/02 <br /> Gasoline Range Organics(C6-C10) 243 50 ug/1 250 97.2 62-134 <br /> Surrogate:a,a,a-Trifluorotoluene 9.81 11 10.0 98.1 55-142 <br /> Laboratory Control Sample Dup(ZL03002-BSD1) Prepared: 12/03/02 Analyzed: 12/04/02 <br /> Benzene 8.55 0.50 ugll 10.0 85.5 68-140 20.5 30 <br /> Toluene 8.72 0.50 11 10.0 <br /> 87.2 76.127 21.3 30 <br /> Ethylbenzene 9.31 0.50 11 10.0 93.1 77-130 21.9 21 <br /> QR-02 <br /> Xylenes(total) 26.8 0.50 30.0 89.3 78-128 21.3 21 <br /> QR-02 <br /> Surrogate:a,a,a-Trifluorotoluene 8,03 11 10.0 80.3 55-142 <br /> Laboratory Control Sample Dup(ZL03002-BSD2) Prepared: 12/03/02 Analyzed: 22/04/02 <br /> Gasoline Range Organics(C6-C10) 249 50 ug/l 250 99.6 62-134 2.44 41 <br /> Surrogate:a,a,a-Tr�fluorotoluene 6.89 11 100 68.9 55-142 <br /> Sia Analytical -Morgan Hill 77:e 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 7 of 13 <br />