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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www.sequoialabs.com <br /> atus Environmental project: ARCD 548,Stockton,CA <br /> 3330 Cameron Park Drive,Ste.550 Projectivumber: 548,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 06/24/02 16:34 <br /> Total Purgeable Hydrocarbons and BTEX by DHS LUFT - 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 /> Batch 2060256-EPA 5030B (PIT) <br /> Blank(2060256-BLK1) Prepared&Analyzed: 06/19/02 <br /> Purgeable Hydrocarbons 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 /> Surrogate:a,a,a-Trifluorotoluene 9.68 10.0 97 60-140 <br /> LCS(2060256-BSI) Prepared&Analyzed:06/19/02 <br /> Benzene 8.43 0.50 ug/l 10.0 84 70-130 <br /> Toluene 9.38 0.50 10.0 94 70-130 <br /> Ethylbenzene 9.42 0.50 10.0 94 70-130 <br /> Xylenes(total) 24.8 0.50 30.0 83 70-130 <br /> ogate:a,a,a-Trifluorotoluene ]0.0 10.0 1�26 <br /> 0-140 <br /> at1- Spike{2060256-MSl) Source:5206212-02 Prepared&Analyzed: 0 <br /> Benzene 8.29 0.50 ug/l 10.0 ND 80-140 <br /> Toluene 9.07 0.50 10.0 ND 91 60-140 <br /> Ethylbenzene 9,06 0.50 10.0 ND 91 60-140 <br /> Xylenes(total) 24.0 0.50 30.0 ND 80 60-140 <br /> Surrogate:a,a,a-Trifluorotoluene 9.27 10.0 93 60-140 <br /> Matrix Spike Dup(2060256-MSDI) Source:5206212-02 Prepared&Analyzed:06/19/02 <br /> Benzene 8.32 0.50 ug/l 10.0 ND 82 60-140 0.4 25 <br /> Toluene 8.98 0.50 10.0 ND 90 60-140 1 25 <br /> Ethylbenzene 8.94 0.50 10.0 ND 89 60-140 1 25 <br /> Xylenes(total) 23.5 0.50 30.0 ND 78 60-140 2 25 <br /> Surrogate:a,a,a-Triuorotoluene 9.88 10.0 99 60-140 <br /> oia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page Page 10 of 13 <br />