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404 N.WlgetLane <br /> Sequoia Walnut Creek, CA 94598 <br /> -9600 <br /> (925)9898B-9600 <br /> Analytical FAX equo 9abs.co 3 <br /> wwwsequolalabs.com <br /> San Joaquin Company Inc, Project; 7500 W l lth St.Steet'Tracy <br /> 1120 Hollywood Ave.No.3 Project Number: # 9902.012 Reported: <br /> Oakland CA.,94602 Project Manager: Dai Watkins 26-May-00 12:24 <br /> 'r Volatile Organic Compounds by EPA Method 8260A- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> 1. Analyte Result Limit Ul- is Level Result %REC Limits RPD Limit Notes <br /> Batch OB18022-EPA 5030E [PIT] <br /> CS(OE18022-1iS2) Prepared&Analyzed: 19-May-00 <br /> MiA y1 tert-butyl ether 55,8 2.0 ug/I 50.0 112 70-130 <br /> :3 urrogate:Dibromofluoromeihane 53.0 50.0 106 50-150 <br /> Surrogate:l,2-Dichloroethane-d4 54.0 50.0 108 50-150 <br /> Matrix Spike(OB18022-MSI) Source:W005292-01 Prepared: 18-May-00 Analyzed: 19-May-00 <br /> "1Vlelhyl tett-butyl ether 56.0 2.0 ug/l 50.0 ND 112 60-150 <br /> :-Sur'rogate:Dibromofluoromeihane 56.0 50.0 112 50-150 <br /> Surrogate:1,2 Dichloroethane-d4 57.0 50.0 114 50-150 <br /> i'=.Matrix Spike Dup (O 18022-MSDI) Source:W005292-01 Prepared: 18-May-00 Analyzed: 19-May-00 <br /> Methyl tett-butyl ether 59.0 2,0 ug/I 50.0 ND 118 60-150 5.22 25 <br /> Surrogate:Dibromofluoromeihane 55.0 " 50.0 110 50-150 <br /> tc;-<r{gate:1,2-DichloroeYhane-d4 57.0 50.0 114 50-150 <br /> �> I <br /> ! <br /> '.Sequoia Analytical-Walnut Creek The results in this reporl apply to the samples analyzed in accordance with the chain of <br /> custody document.This[malytical report must be reproduced in its entirety. <br /> I -J <br /> Page 16 of 17 <br />