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Sequoia 404 N. , CA Lane <br /> Walnut Creek, CA 94598 <br /> Analytical FAX <br /> 15) (925)988-9600 <br /> (925)988-9673 <br /> ` ::iettler Ryan,Inc.-Dublin Project: Unocal <br /> 6747 Sierra Court Suite J Project Number: Unocal 411195 Reported: <br /> Dublin CA,94568 Project Manager: Deanna L.Harding 09-Dec-99 08:34 <br /> Volatile Organic Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical -Walnut Creep <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 9L01009: Prepared 03-Dec-99 Using EPA 5030B [P/Tl <br /> Blank(9L01009-BLK2) <br /> terl-Butyl alcohol ND 100 ug/l <br /> Methyl tert-butyl ether ND 2.0 " <br /> Di-isopropyl ether ND 2.0 " <br /> Ethyl tert-butyl ether ND 2.0 " <br /> tent-Amyl methyl ether ND 2.0 " <br /> Surrogate:Dibrornofluoromethane 50.9 " 50.0 102 50-150 <br /> Surrogate:1,2Dichloroethane-d4 45,1 50.0 90.2 50-150 <br /> LCS(9L01009-BS2) <br /> Methyl tert-butyl ether 60.2 2.0 ug/l 50.0 120 70-130 <br /> Surrogate:Dibrornofluoromethane 52.9 50.0 106 50-150 <br /> ' o ate, 1,2Dichloroethane-d4 47.9 50.0 95.8 50-150 <br /> - g <br /> Matrix Spike(91.01009-MS2) Source:W911580-08 <br /> Methyl tert-butyl ether 41.7 2.0 ug/1 50.0 3.4 76.6 60-150 <br /> Surrogate:Dibromofluoromethane 49.3 50.0 98.6 50-150 <br /> Surrogate:l,2-Dichloroethpne-d4 42.0 50.0 84.0 50-150 <br /> Matrix Spike Dup(9L01009-MSD2) Source: W911580-08 <br /> Methyl tent-butyl ether 54.2 2.0 ug/I 50,0 3.4 102 60-150 26.1 25 Q-07 <br /> Surrogate:Dibromofluoromethane 52.0 50.0 104 50-150 <br /> Surrogate:l,2-Dichloroelhane-d4 45.2 50.0 90.4 50-150 <br /> Sequoia Analytical -Walnut Creek The results in this report apply to the samples analyzed i n accordance with the chain of <br /> custody document This analytical report must be reproduced in i is entirety, <br /> 1 <br /> r� <br /> Alan B.Kemp,Laborato Director Page 11 of 12 <br />