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• �,�_,/ r 819 Striker Avenue, Suite 8 { <br />S e qu o 1 a Sacramento, CA 95834 <br />® (916)921-9600 <br />FAX (916) 92 1 -0100 <br />.Analytical www.sequoWabs.com <br />Kleinfelder - Stockton Project: 1444 Mariposa S309079 <br />2825 East Myrtle Street Project Number: 34202 Reported: <br />Stockton CA, 95205 Project Manager: Francis Bean 09/09/03 16:14 <br />BTEX by DHS LUFT - Quality Control <br />Sequoia Analytical - Sacramento <br />Reporting Spike Source %REC RPD <br />knalyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br />J <br />1 <br />i <br />J <br />Batch 3090054 - EPA 5030B (P/T) <br />, <br />Blank (3090054-BLKI) <br />Prepared & Analyzed: 09/04/03 <br />J <br />Benzene <br />ND <br />0.0050 <br />mg/kg <br />Toluene <br />ND <br />0.0050 <br />Ethylbenzene <br />ND <br />0.0050 <br />" <br />Xylenes (total) <br />ND <br />0.0050 <br />" <br />Surrogate: a,a,a-Trifluorotoluene <br />0.0235 <br />0.0200 118 60-140 <br />Laboratory Control Sample (3090054-BS1) <br />Prepared & Analyzed: 09/04/03 <br />Benzene <br />0.0244 <br />0.0050 <br />mg/kg <br />0.0200 122 70-130 <br />Toluene <br />0.0251 <br />0.0050 <br />0.0200 126 70-130 <br />t <br />Ethylbenzene <br />0.0244 <br />0.0050 <br />0.0200 122 70-130 <br />Xylenes (total) <br />0.0739 <br />0.0050 <br />0.0600 123 70-130 <br />Surrogate: a,a,a-Tris luorotoluene <br />0.0153 <br />0.0200 126 60-140 <br />Matrix Spike (309005.3 -MSI) <br />Source: 5309086-01 <br />Prepared & Analyzed: 09/04/03 <br />Benzene <br />0.0213 <br />0.0050 <br />mg/kg <br />0.0200 ND 106 60-140 <br />Toluene <br />0.0219 <br />0.0050 <br />0.0200 ND 110 60-140 <br />1 <br />Ethylbenzene <br />0.0210 <br />0.0050 <br />0.0200 ND 105 60-140 <br />Xylenes (total) <br />0.0638 <br />0.0050 <br />0.0600 NO 106, 60-140 <br />Surrogate: a,a,a-Trifluorotoluene <br />0.0131 <br />0.0200 116 .60-140 <br />Matrix Spike Dup (3090054-MSD1) <br />Source: S309086-01 <br />Prepared & Analyzed: 09/04/03 <br />Benzene <br />0.0213 <br />0.0050 <br />mg/kg <br />0.0200 ND 106 60-140 <br />0 25 <br />Toluene <br />0.0219 <br />0.0050 <br />" <br />0.0200 ND, 110 60-140 <br />0 25 <br />, <br />Ethylbenzene <br />0.0212 <br />0.0050 <br />0.0200 ND 106 60-140 <br />0.9 25 <br />Xylenes (total) <br />0.0648 <br />0.0050 <br />0.0600 ND 108 60-140 <br />2 25 <br />-� <br />Surrogate: a,a,a-Trifluorotoluene <br />0.0239 <br />0.0200 120 60-140 <br />Sequoia Analytical - Sacramento <br />t <br />J <br />J <br />J <br />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. J <br />*. <br />Page 8 of 17 t <br />J <br />