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1 <br />Sequoia <br />IwoAnalytical <br />�J <br />ro <br />819 Striker Avenue, Suite E. <br />Sacramento, CA 95834 <br />(916)921-9600 <br />FAX (916) 921-01 OG j <br />www.sequoialabs.com J <br />Kleinfelder - Stockton Project: Northbrook S309020 <br />2825 East Myrtle Street Project Number: 34202.EO1 Reported: <br />Stockton CA, 95205 Project Manager: Joe Zilles 09/05/03 14:17 <br />1 <br />Gasoline (2-Methylpentane to 1,2,4-Trimethylbenzene) and BTEX by EPA 8015M and 8021E - Quality Contr <br />Sequoia Analytical - Sacramento <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 3080397 - EPA 5030B (P/T) <br />Laboratory Control Sample (3080397-BS2) <br />0.0233 <br />Prepared & Analyzed: 08/29/03 <br />Benzene <br />0.0225 <br />0.0050 mg/kg <br />0.0200 112 70-130 <br />Toluene <br />0.0234 <br />0.0050 <br />0.0200 117 70-130 <br />Ethylbenzene <br />0:0226 <br />0.0050 <br />0.0200 113 70-130 <br />Xylenes (total) <br />0.0696 <br />0.0050 <br />0.0600 116 70-130 <br />J <br />J <br />Surrogate: a,a,a-Tris lucrotoluene <br />0.0233 <br />0.0200 116 60-140 <br />Laboratory Control Sample (3080397-BS3) <br />Prepared & Analyzed: 09/03/03 <br />Benzene <br />0.0211 <br />0.0050 <br />mg/kg <br />0.0200 106 70-130 <br />Toluene <br />0.0211 <br />0.0050 <br />0.0200 106 70-130 <br />Ethylbenzene <br />0.0190 <br />0.0050 <br />0.0200 95 70-130 <br />J <br />Xylenes (total) <br />0.0594 <br />0.0050 <br />0.0600 99 70-130 <br />Surrogate: a,a,a-TKluorotoluene <br />0.0252 <br />0.0200 126 60-140 <br />j <br />Matrix Spike (3080397 -MSI) <br />Source: S308538-08 <br />Prepared & Analyzed: 08/29/03 <br />J <br />Benzene <br />0.0217 <br />0.0050 <br />mg/kg <br />0.0200 ND 108 .60-140 <br />Toluene <br />0.0223 <br />0.0050 <br />0.0200 ND 112 60-140 <br />Ethylbenzene <br />0.0211 <br />0.0050 <br />0.0200 ND 106 60-140 <br />Xylenes (total) <br />0.0640 <br />0.0050 <br />0.0600 ND 107 60-140 <br />Surrogate: a,a,a-Triuorotoluene <br />0.0229 <br />0.0200 114 60-140 <br />Matrix Spike Dup (:1080397-MSDl) <br />Source: S308538-08 <br />Prepared & Analyzed: 08/29/03 <br />Benzene <br />0.0213 <br />0.0050 <br />mg/kg <br />0.0200 ND 106 60-140 <br />2 <br />25 <br />Toluene <br />0.0223 <br />0.0050 <br />0.0200 ND 112 60-140 <br />0 <br />25 <br />Ethylbenzene <br />0.0210 <br />0.0050 <br />0.0200 ND 105 60-140 <br />0.5 <br />25 <br />Xylenes (total) <br />0.0637 <br />0:0050 <br />0.0600 ND 106 60-140 <br />O.5 <br />25 <br />Surrogate: a,a,a-Tris luarotoluene 0.0232 11 0.0200 116 60-140 <br />J <br />J <br />Sequoia Analytical - Sacramento 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 10 of 18 <br />