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I <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-%00 FAX(925)988-9673 <br /> ` 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> �,,,,� Analytical <br /> 1455 McDowell Blvd,North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-034Z <br /> ATC Associates,Inc. Project: SUSD/Corporation Yard Sampled: 2/23/99 to 2/24/99 <br /> 1117 Lone Palm Ave.,Suite B Project Number: na Received: 3/1/99 <br /> Modesto,CA 95351 Project Manager: Tom Lutterman Reported: 3/15/99 <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 % Nates* <br /> Blank 9030221-BLK3 <br /> Tert-amyl methyl ether 3/11/99 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 tert-butyl ether ND 5.00 <br /> Methyl Cert-butyl ether_ __ _ _ND 5.00 _ <br /> Surrogate: Dibromofluoron ethane �" 50.0 50.0 - 80.0-120 100 - <br /> k Surrogate: 1,2-Dichloroethane-d4 50.0 51.6 80.0-120 103 <br /> Surrogate: Toluene-d8 50.0 49.5 81.0-117 99.0 <br /> Surrogate: 4-Bromofluorobenzene 50.0 51.6 74.0-121 103 <br /> F- S 9030221-BSI <br /> thy]tert-butyl ether 3/9/99 50.0 45.5 ug/kg 70.0-130 91.0 <br /> Surrogate: Dibromofluoromethane 50.0 - . <br /> .fl 50 7 80.0-I20 101 <br /> Surrogate: 1,2-Dichloroethane-d4 50.0 49.4 80.0-120 98.8 <br /> Surrogate: Toluene-d8 I' 50.0 46.7 /I 81.0-117 93.4 <br /> Surrogate: 4-Bromofluorobenzene 50.0 51.5 74.0-121 103 <br /> LCS 9030221-BS2 <br /> Methyl ter-butyl ether __ _ 3/10/99 50.0 47.4 ug/kg 70.0-130 94.8 <br /> Surrogate:-Dibromofluoromeihane 50.0 53.6 80.0-120 107 <br /> Surrogate: 1,2-Dichloroethane-d4 50.0 56.4 1080.0-120 113 <br /> Surrogate: Toluene-d8 50.0 48.4 81.0-117 96.8 <br /> Surrogate: 4-Bromofluorobenzene 50.0 53.1 74.0-121 106 <br /> LCS 9030221-BS3 <br /> Methyl tert-butyl ether 3/11/99 50.0 44.6 ug/kg 70.0-130 89.2 <br /> Surrogate: Dibromofluoromethane 50.0 52.0 80.0-120 104 <br /> Surrogate: 1,2-Dichloroethane-d4 50.0 56.3 80.0-120 113 <br /> Surrogate: Toluene-d8 50.0 43.6 81.0-117 87.2 <br /> Surrogate: 4-Bromofluorobenzene 50.0 50.3 74.0-121 101 <br /> Matrix Spike 9030221-MSI P903097-23 <br /> Methyl tert-butyl ether -_3/9/99 50.0 ND 52.0 ug/kg 70.0-130 104 <br /> Surrogate: Dibromofluoromethane 50.0 49.2 80.0-120 98.4 <br /> Surrogate: 1,2-Dichloroethane-d4 50.0 55.5 80.0-120 111 <br /> Surrogate: Toluene-d8 50.0 45.7 81.0-117 91.4 <br /> Surrogate: 4-Bromofluorobenzene 50,19 47.2 74.0-121 94.4 <br /> nota Analytical-Petaluma *Refer to end of report for text of notes and definitions. <br /> Page 26 of 28 <br /> I {p. <br />