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,t <br /> 819 Sinker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> A (916)921-9600 <br /> Analytical <br /> FAX(916)921-8100 <br /> www sequoialabs com <br /> WECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA <br /> 3017 Kilgore Road, Suite 100 ProJ=t Number 2093,Tracy,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/08/02 17 22 <br /> Total Purgeable Hydrocarbons and BTEX by DHS LUFT-Quality Control <br /> Sequoia Analytical-Sacramento <br /> Anal Reporting Spike Source %REC RPD <br /> Result Lunit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2010032-EPA 5030B(PPT) <br /> Blank 2010032-BLKI PrePared&Analyzed 01/02/02 <br /> Purgeable Hydrocarbons ND 50 119/1 <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate aa a-Trifluorotoluene 103 100 103 60-140 <br /> LCS 2010032-BSI PrePared.&Analyzed 01/02/02 <br /> Benzene 100 050 ug/I 100 100 70-130 <br /> Toluene 9 91 050 100 99 1 70-130 <br /> Ethylbenzene 9 69 050 10 0 969 70-130 <br /> Xylenes(total) 297 050 300 990 70-130 <br /> d <br /> rrOgate a,a a-Trrfluorotoluene 108 100 108 60-140 <br /> atria Spike 2010032-MS1 Source SI12370-06 Prepared&Anal 01/02/02 <br /> Benzene 988 050 ug/I 100 ND 98 8 60-140 <br /> Toluene 998 0 50 100 ND 998 60-140 <br /> EthyIbenzene 9 60 050 100 ND 960 60-140 <br /> Xylenes(total) 296 050 " 300 ND 997 60-140 <br /> Surrogate a,a,a-Trifluorotoluene 105 100 105 60-140 <br /> Matrix Spike Du 2010032-MSD1Source 5112370-06 PrePared&Anal 01/02/02 <br /> Benzene 102 050 u8/1 100 ND 102 60-140 3 19 25 <br /> Toluene 100 0 50 100 ND 100 60-140 0200 25 <br /> Ethylbenzene 9 77 050 " 100 ND 977 60-140 176 25 <br /> Xylenes(total) 30 1 050 300 ND 100 60-140 168 25 <br /> Surrogate a a,a-Trrfluorotoluene 100 100 100 60-140 <br /> ut)1a Analytical-Sacramento The results to this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 6 of 8 <br />