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i <br /> Sequoia 680 Chesapeake Drive Redwood City.CA 94063 (650)364-%00 FAX(650)364-9233 <br /> 404 N.Wlget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> _ 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-010o <br /> Analytical <br /> 1455 McDowell Blvd.North,Ste.D Petaluma CA 94954 (707)792-1865 FAX(707)791-0342 <br /> ATC Associates,Inc. <br /> Project: SUSD/Corporation Yard Sampled: 2/23199 to 2/24/99 <br /> 1117 Lone Palm Ave.,Suite B Project Number: na Received: 3/1199 <br /> Modesto,CA 95351 Project Manager: Tam Letterman Reported: 3/15/99 <br /> BTEX by 8020M/Quality Control <br /> Sequoia Analytical-Petaluma <br /> ' Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Batch: 9020581 Date Prepared: 2/26/99 Extraction Method: EPA 5030 soils McOH <br /> Blank 9020581-BLK1 <br /> Benzene 2/26/99 <br /> ND ug/kg I00 <br /> Toluene <br /> ND 100 <br /> Ethylbenzene ND " <br /> 100 <br /> _Xylenes(total) _ _ ND 200 <br /> f' Surrogate: a,a,a-Trifluorotoluene " 30000 A 29700 99.0 <br /> Blank ! <br /> 9020581-BLK2 <br /> Benzene 315/99 <br /> Toluene ND ug/kg 50.0 <br /> ND 50.0 <br /> Ethylbenzene ND 50.0 <br /> Xylenes(total) ND 100 <br /> `Surrogate: a,a,a-Trifluorotoluene 30000 29300 97,7 <br /> ;-rogate: 4-Bromofluorobenzene 30000 28700 95.7 <br /> LCS 9020581-BSl <br /> Benzene 2/26/99 10000 10100 ug/kg 101 <br /> Toluene " 10000 9890 989 <br /> Ethylbenzene 10000 9800 98.0 <br /> Xylenes(total) 30000 29600 98.7 _ <br /> Surrogate: a,a,a-Trfluorotoluene 30000 31400 105 <br /> I <br /> i <br /> LLS 9020581-BS2 <br /> [- Benzene 3/5/99 10000 10500 ug/kg 105 <br /> ` .Toluene 10000 10000 " 100 ! <br /> fw Ethylbenzene 10000 9780 97.8 <br /> _Xylenes(total) 30000 29600 98.7 <br /> Surrogate: a,a,a-Trifluorotoluene 30000 31600 105 <br /> Matrix Spike 9020581-MS1 P902494-01 <br /> Benzene 2/26/99 10000 104 10700 ug/kg 106 <br /> Toluene 10000 319 10800 105 <br /> Ethylbenzene 10000 ND 10600 106 <br /> Xylenes(total) 30000 ND 32100 107 _ <br /> Surrogate: a,a,a-Trifluorotoluene 30000 32400 108 W <br /> Matrix Spike Dui) 9020581-MSD1 P902494-01 <br /> Benzene 2/26/99 10000 104 10600 ug/kg 105 0.948 <br /> Toluene " 10000 319 10700 104 0.957 <br /> Ethylbenzene 10000 ND 10500 105 0.948 <br /> lenes(total) 30000 ND 31600 105 1.89 <br /> Sequoia Analytical-Petaluma *Refer to end of report far text of notes and definitions. <br /> Page 20 of 28 <br /> .. t� <br />