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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> 4 (916)921-9600 <br /> fAX(916) 921-0100 <br /> Analytical vvww.sequoialabs.cum <br /> ATC Associates Inc,-Modesto Project: SUSD Stagg HS Sampled: 6/5/00 <br /> 1117 Lone Palm Ave., Ste. B Project Number: 54.17292.0002 Received: 6/6100 <br /> Modesto,CA 95351 Project Manager: Tom Lutterman Reported: 6/20/00 <br /> Total Purgeable Hydrocarbons(C6-C12) and BTLX 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: 0060186 Date Prepared: 6119100 Extraction Method: EPA 50306 McOH <br /> Blank 0060186-BLKI <br /> Purgeable Hydrocarbons 6/19/00 ND ugh 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-Triuorotoluene 10.0 10.4 60.0-140 104 <br /> LCS 0060186-BSI <br /> Benzene 6119/00 10.0 11.1 ug/1 70.0-130 111 <br /> Toluene 10.0 11.0 70.0-130 110 <br /> Ethylbenzene 10.0 10.9 70.0-130 109 <br /> Xylenes(total) 30.0 32.6 70.0-130 109 <br /> isogate: a,a,a-Trifluorotoluene 10.0 10.8 60.0-140 108 <br /> Matrix Spike 0060186-MS1 5006067-07 <br /> Benzene 6/19/00 10.0 ND 11.0 ug/1 60.0-140 110 <br /> Toluene " 10.0 ND 10.6 60.0-140 106 <br /> Ethylbenzene 10.0 ND 10.8 60.0-140 108 <br /> Xylenes(total) 30.0 ND 32.4 60.0-140 108 <br /> Surrogate: a,a,a-Trifluorotaluene 10.0 10.5 60.0-140 105 <br /> Matrix Spike Dup' 0060186-iiMSDI 5006067-07 <br /> Benzene 6/19/00 10.0 ND 10.4 ug/l 60.0-140 104 25.0 5.61 <br /> Toluene l0A ND 10.6 60.0-140 106 25.0 0 <br /> Ethylbenzene 10.0 ND 10.7 60.0-140 107 25.0 0.930 <br /> Xylenes(total) 30.0 ND 31.9 " 60.0-140 1[06 25.0 1.87 <br /> Surrogate: a,a,a-Trifluorotaluene 10.0 9.39 60.0-140 93.9 <br /> Sequoia Analytical -Sacramento *Refer to end afreport for test ofnotes and definitions <br /> Page 4 of 6 <br />