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r % <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N.Wiget lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 81[9 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)911-0100 <br /> 1455 McDowell Blvd.North,Ste.D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0341 <br /> [ATC Associates,Inc. Project: SUSD/Corporation Yard Sampled: 2/23/99 to 2/24/99 <br /> 7 Lone Palm Ave.,Suite B Project Number: na Received: 3/1/99 <br /> esto,CA 95351 Project Manager: Tam Lutterman Reported: 3115/99 <br /> Volatile Organic Compounds by EPA Method 8260B/Quality Control <br /> Sequoia Analytical-Petaluma <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Batch: 9030118 Date Prepared: 314199 Extraction Method: EPA 5035 <br /> Blank 9030118-BLKI <br /> Tert-amyl methyl ether 3/4/99 ND ug/kg 5.00 <br /> Tert-butyl alcohol 11 ND " 100 <br /> Di-isopropyl ether ND 5.00 <br /> 1,2-Dibromoethane(EDS) ND 5.00 <br /> 1,2-Dichloroethane ND 5.00 <br /> Ethanol " ND " 200 <br /> Ethyl tent-butyl ether ND 5.00 <br /> Methyl tert-butyl ether_ _ _ ND 5.00 <br /> Surrogate: Dibromofluorom_etlaane 50.0 48.7 80.0-120 97.4 <br /> Surrogate: 1,2-Dichloroethane-d4 " 50.0 49.5 If <br /> 80.0-120 99.0 <br /> Surrogate: Toluene-d8 " 50.0 50.0 81.0-117 100 <br /> Surrogate: 4-Bromofluorobenzene 50.0 48.4 74.0-121 96.8 <br /> �r r,� Y methyl nk 9030118-BLK2 <br /> ether 3/8/99 ND <br /> t ert-am 1 u 5.00 <br /> Y g�8 <br /> w Tert-butyl alcohol " ND 100 <br /> Di-isopropyl ether ND 5.00 <br /> 1,2-Dibromoethane(EDB) " ND 5.00 <br /> 1,2-Dichloroethane ND 5.00 <br /> Ethanol ND 200 <br /> Ethyl tent-butyl ether ND " 5.00 <br /> Methyl tent-butyl ether ND 5.00 <br /> Surrogate: Dibromofluorontethane 50.0 51.1 80.0-120 102 <br /> Surrogate: 1,2-Dichloroethane-d4 50.0 54.6 80.0-120 109 <br /> Surrogate: Toluene-d8 50-0 50.6 81.0-117 101 <br /> Surrogate: 4-Bromofluorobenzene " 50.0 54.3 " 74.0-121 109 <br /> Blank 9030118-BLK3 <br /> Tert-amyl methyl ether 3/9199 ND ug/kg 5.00 <br /> Tert-butyl alcohol ND 100 <br /> Di-isopropyl ether ND 5.00 <br /> 1,2-Dibromoethane(EDB) ND 5.00 <br /> 1,2-Dichloroethane ND 5.00 <br /> Ethanol ND 200 <br /> Ethyl i rt-butyltort but ether " ND " 5.00 --- -- --� <br /> Methyi tent-butyl ether ND S.OD _ <br /> Surrogate: Dibromofluoromethane " 50.0 47.7 " 80.0-120 95.4 <br /> Surrogate: 1,2-Dichloroethane-d4 50.0 44.6 80.0-120 89.2 <br /> Surrogate: Toluene-d8 „ 50.0 50.0 81.0-117 100 <br /> Surrogate: 4-Bromofluorobenzene 50.0 50.2 74.0-121 100 <br /> uoia Analytical-Petaluma *Refer to end of report for text of notes and definitions. <br /> Page 23 of 28 <br />