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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.scquoialabs.com <br /> atus Environmental Inc. Project: ARCO#5469, Stockton,CA MLK0837 <br /> 0 Cameron Park Dr.,Suite 550 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 /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2LO3002-EPA 5030B PIT <br /> Blank(2L03002-BLKI) Prepared&Analyzed: 12/03/02 <br /> Gasoline Range Organics(C6-C 10) ND 50 ug/1 <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:a,a,a-Trifluorotoluene 10.9 10.0 109 55-141 <br /> Laboratory Control Sample(2L03002-BS1) Prepared&Analyzed: 12/03/02 <br /> Benzene 10.5 0.50 ug/l 10.0 105 68-140 <br /> Toluene 10.8 0.50 10.0 108 76-127 <br /> Ethylbenzene 11,6 0.50 10.0 116 77-130 <br /> Des(total) 33.2 0.50 30.0 111 78-128 <br /> Surrogate:a,a,a-Trifluorotoluene 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 10.0 98,1 55-142 <br /> Laboratory Control Sample Dup(2L03002-ESDI) Prepared: 12/03/02 Analyzed: 12/04/02 <br /> Benzene 8.55 0.50 ug/l 10.0 85.5 68-140 20.5 30 <br /> Toluene 8.72 0.50 10.0 87.2 76-127 21.3 30 <br /> Ethylbenzene 9.31 0.50 10.0 93.1 77-130 21.9 21 QR-02 <br /> Xylenes(total) 26.8 0.50 30.0 89.3 78-128 21.3 21 QR-02 <br /> Surrogate:a,a,a-Trifluorotoluene 8.03 10.0 80.3 55-142 <br /> Laboratory Control Sample Dup(2L03002-BSD2) Prepared: 12/03/02 Analyzed: 12/04/02 <br /> Gasoline Range Organics(C6-CIO)- 249 50 ug/1 250 - 99,6 62-134 2.44 41 <br /> Surrogate:a,a,a-Trifluorotoluene 6.89 " 10.0 68.9 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 7 of 13 <br />