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885 37Sequoia Morgan Hill, <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.se gttoialabs.can <br /> RS Corporation[11 Project: ARCO 9548,Stockton,Ca MLK0692 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO i#548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vem Elarth 12/02/02 13:43 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified,BTEXM 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 2K22004-EPA 5034E IP/TI <br /> Blank(2K22004-BLK1) Prepared&Analyzed: 11/22/02 <br /> Gasoline Range Organics(C6-C10) ND 50 ug/l <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene. ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Methyl tert-butyl ether ND 2.5 " <br /> Surrogate:a,a a-Trifluorotoluene 10.9 10.0 109 55-142 <br /> Laboratory Control Sample(2K22004-BS1) Prepared&Analyzed: 11/22/02 <br /> Benzene 11.3 0.50 ug/1 10.0 113 66-140 <br /> Toluene 11.2 0.50 10.0 112 76-127 <br /> Ethylbenzene 10.7 0.50 10.0 107 77-130 <br /> 0lenes(total) 34.2 0.50 30.0 114 78-128 <br /> Surrogate:a,a,a-Tris luorotoluene Il.l 10.0 111 55-142 <br /> Laboratory Control Sample(2K22004-BS2) Prepared&Analyzed: 11/22/02 _ <br /> Gasoline Range Organics(C6-C 10) 273 50 ug/l 250 109 62-134 <br /> Surrogate:a,a,a-Triiluorotoluene 17.1 10.0 171 55-142 S-02 <br /> Laboratory Control Sample Dup(2K22004-ESDI) Prepared: 11/22/02 Analyzed: 11/23/02 <br /> Benzene 11.2 0.50 ug/l 10.0 112 68-140 0.889 30 <br /> Toluene 11.2 0.50 10.0 112 76-127 0.00 30 <br /> Ethylbenzene 10.7 0.50 10.0 107 77-130 0.00 21 <br /> Xylenes(total) 34.7 0.50 30.0 116 78-128 1.45 21 <br /> Surrogate:a,a,a-Tris luorotoluene 9.62 10.0 96.2 55-142 <br /> Laboratory Control Sample Dup(2K22004-BSD2) Prepared: 11/22/02 Analyzed: 11/23/02 <br /> Gasoline Range Organics(C6-C10) 251 50 ug/1 250 100 62-134 8.40 41 <br /> Surrogate:a,a,a-Trifluorotoluene 14.8 10.0 148 55-142 S-02 <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 stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> 7 of 9 <br />