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819 Striker Avenue, Suite 8 <br /> 4 15) Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-01o0 <br /> Analytical www_sequoialabs.com <br /> Stratus Environmental Project: ARCO 5469,Stockton,CA <br /> 3330 Cameron Park Drive,Ste. 550 Project Number: 5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: ,lay Johnson 10/14/02 16:55 <br /> Total Purgeable Hydrocarbons and BTEX by DHS LUFT - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %PEC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2100051 -EPA 5030B P/T <br /> Blank(2100051-BLKl) Prepared: 10/03/02 Analyzed: 10/04/02 <br /> Purgeable Hydrocarbons ND 50 ue <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 10.9 10.0 109 60-140 <br /> Blank(2100051-BLK2) Prepared&Analyzed: 10/04/02 <br /> Purgeable Hydrocarbons ND 50 ugll <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> ]benzene ND 0.50 <br /> enes(total) ND 0.50 " <br /> Surrogate:a,a a•Trifluorotoluene 10.9 10.0 109 60-140 <br /> LCS(2100051-BSJ) Prepared: 10/03/02 Analyzed: 10/05/02 _ <br /> Benzene 9.70 0.50 ug/l 10.0 97 70-130 <br /> Toluene 9.90 0.50 10.0 99 70-130 <br /> Ethylbemene 8.81 0.50 10.0 88 70-130 <br /> Xylenes(total) 33,6 0.50 30.0 112 70-130 <br /> Surrogate:a,a,a-Trifluorotoluene 9.94 10.0 99 60-140 <br /> LCS(2100051-BS2) _ Prepared&Analyzed: 10/04/02 <br /> Benzene 8.70 0.50 ugll Mo 87 70-130 <br /> Toluene 9.72 0.50 10.0 97 70-130 <br /> Ethylbenzene 9.71 0.50 10,0 97 70-130 <br /> Xylenes(total) 28.6 0.50 30.0 95 70-130 <br /> Surrogate.,a,a,a-Tri6uorotoluene 9.99 10.0 100 60-140 <br /> uoia 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 /> I Page 9 of 13 <br />