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Sequoia 819 Striker Avenue, Suite 8 <br />Sacramento, CA 95834 <br />(916)921-9600 <br />LACO Analytical <br />n at lycal - FAX (916) 921-0100 <br />a a Ll www.sequoialabs.com <br />D <br />14 <br />Kleinfelder - Stockton <br />"Project: <br />Northbrook <br />S309020 <br />2825 East Myrtle Street <br />Project Number: <br />34202.E01 <br />Reported: <br />Stockton CA, 95205 <br />Project Manager: <br />Joe Zilles <br />09/05/03 14:17 <br />Volatile Organic Compounds by EPA Method 8260B - Quality Control <br />Sequoia Analytical - Sacramento <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />LSurrogate: DibromoJluoromethane <br />0.0561 <br />Batch 3090027 - EPA 5030B [P/TJ <br />112 <br />60-140 <br />Surrogate: 1,2 -DCA -d4 <br />0.0566 <br />0.0500 <br />113 <br />Laboratory Control Sample (3090027-BSl) <br />Toluene -d8 <br />0.0546 <br />Prepared & Analyzed: 09/02/03 <br />P Yz <br />109 <br />Benzene <br />0.0573 <br />0.0050 mg/kg <br />0.0500 <br />115 <br />70-130 <br />LChlorobenzene <br />0.0661 <br />0.0549 <br />0.0050 <br />0.0500 <br />110 <br />70-130 <br />1,1-Dichloroethene <br />0.0576 <br />0.0050- <br />omob <br />115 <br />70-130 <br />ND <br />Toluene <br />0.0556 <br />0.0050 <br />0.0500 <br />111 <br />70-130 <br />0.0687 <br />0.0050 <br />Trichloroethene <br />0.0562 <br />0.0050 <br />0.0500 <br />112 <br />70-130 <br />LSurrogate: DibromoJluoromethane <br />0.0561 <br />0.0500 <br />112 <br />60-140 <br />Surrogate: 1,2 -DCA -d4 <br />0.0566 <br />0.0500 <br />113 <br />. 60-140 . <br />Toluene -d8 <br />0.0546 <br />0.0500 <br />109 <br />60-140 <br />LSurrogate: <br />Surrogate: 4 -BFB <br />0.0562 <br />0.0500 <br />112 <br />60-140 <br />Surrogate: DibromoJluoromethane <br />Matrix Spike (3090027 -MSI) <br />Source: S309018-05 <br />Prepared & Analyzed: 09/02/03 <br />60-140 <br />1,2 -DCA -d4 <br />0.0653 <br />0.0500 <br />131 <br />Benzene <br />0.0653 <br />0.0050 mg/kg <br />0.0500 <br />ND <br />131 <br />60-140 <br />0.0664 <br />0.0500 <br />133 <br />L <br />Chlorobenzene <br />0.0661 <br />0.0050 <br />0.0500 <br />ND <br />132 <br />60-140 <br />1,l-Dichloroethene <br />0.0655 <br />0.0050 <br />0.0500 <br />ND <br />131 <br />60-140 <br />Toluene <br />0.0687 <br />0.0050 <br />0.0500 <br />ND <br />137 <br />60-140 <br />LTrichloroethene <br />0.0622 <br />0.0050 II <br />0.0500 <br />ND <br />124 <br />60-140 <br />Surrogate: Dibromofluoromethane <br />0.0570 <br />0.0500 <br />114 <br />60-140 <br />Surrogate: 1,2 -DCA -d4 <br />0.0602 <br />0.0500 <br />110 <br />60-140 <br />Toluene -d8 <br />0.0629 <br />0.0500 <br />126 <br />60-140 <br />.-LSurrogate: <br />.Surrogate: 4 -BFB <br />0.0669 <br />0.0500 <br />134 <br />607140 <br />Matrix Spike Dup (3090027-MSD1). <br />Source: S309018-05 <br />Prepared & Analyzed: 09/02/03 <br />LBenzene <br />0.0706 <br />0.0050 mg/kg <br />0.0500 <br />ND <br />141 <br />60-140 <br />8 <br />25 Q-LIM <br />Chlorobenzene <br />0.0639 <br />0.0050 <br />0.0500 <br />ND <br />128 <br />60-140. <br />3 <br />25 <br />1, 1 -Dichloroethene <br />0.0685 <br />0.0050" <br />0.0500 <br />ND <br />137 <br />60-140 <br />4 <br />25 <br />0.0664 <br />0.0050 <br />0.0500 <br />ND <br />133 <br />60-140 <br />3 <br />25 <br />LToluene <br />Trichloroethene <br />0.0616 <br />0.0050 <br />0.0500 <br />ND <br />123 <br />60-140 <br />1 <br />25 <br />Surrogate: DibromoJluoromethane <br />0.0620 <br />0.0500 <br />124 <br />60-140 <br />1,2 -DCA -d4 <br />0.0653 <br />0.0500 <br />131 <br />60-140 <br />LSurrogate: <br />Surrogate: Toluene -d8 <br />0.0620 <br />0.0500 <br />124 <br />60-140 <br />Surrogate: 4 -BFB <br />0.0664 <br />0.0500 <br />133 <br />60-140 <br />L <br />L <br />Sequoia Analytical - SaCIamento The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document. Unless otherwise stater, results are reported on a wet weight basis. <br />L This analytical report must be reproduced in its entirety. <br />Page 17 of 18 <br />