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Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento, CA 95834 <br /> 9!ZN (916)921-9600 <br /> VAnalytical www.sequoialabs.coOm <br /> ATC Associates Inc. -Modesto Project: SUSD Stagg HS Sampled: 918100 <br /> ]117 Lone Palm Ave., Ste. B Project Number: 54.17292.0002 Received: 9/11/00 <br /> Modesto,CA 95351 Project Manager: Tom Lutterman Reported: 9123/00 <br /> Total Purgeable Hydrocarbons (C6-C12)and BTEX by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 0090175 Date Prepared: 9116/00 Extraction Method: EPA 5030B McOH <br /> Blank 0090175-B L Kl <br /> Purgeable Hydrocarbons 9/16/00 ND ug/l 50.0 <br /> Benzene ND 0.500 <br /> Toluene ND 0.500 <br /> Ethylbenzene ND 0.500 <br /> Xylenes(total) ND 0.500 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.88 60.0-140 98.8 <br /> LCS 0090175-BS] <br /> Benzene 9/16/00 10.0 10.5 ug/l 70.0-130 105 <br /> Toluene 10.0 10.4 70.0-130 104 <br /> Ethylbenzene 10.0 10.9 70.0-130 109 <br /> Xylenes(total) 30.0 32.5 70.0-130 108 <br /> &gate: a,a,a-Triuorotoluene 10.0 10.4 60.0-140 104 <br /> Matrix Spike 0090175-MSI 5009157-01 <br /> Benzene 9/16/00 10.0 ND 10.6 ug/l 60.0-140 106 <br /> Toluene 10.0 ND 10.5 60.0-140 105 <br /> Ethylbenzene 10,0 ND 10.7 60.0-140 107 <br /> Xylenes(total) 30.0 ND 32.3 60.0-140 108 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 10-2 60.0-140 102 <br /> Matrix Spike Dup 0090175-MSDI S009157-01 <br /> Benzene 9116/00 10.0 ND 10.1 ug/l 60.0-140 101 25.0 4.83 <br /> Toluene 10.0 ND 10.2 60.0-140 102 25.0 2.90 <br /> Ethylbenzene 10.0 ND 10.5 60.0-140 105 25.0 1.89 <br /> Xylenes(total) 30.0 ND 31.5 60.0-140 105 25.0 2.82 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.68 60.0-140 96.8 <br /> Sequoia Analytical- Sacramento *Refer to end ofreport for text of notes and definitions. <br /> Page 4 of 6 <br />