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404 N WEget Lane <br /> Walnut Creek,CA. 4598 <br /> Sequoia (925) %73 <br /> FAX(425)9M%73 <br /> —4— - — www sequol dabs com _ <br /> Analytical - <br /> Gettler Ryan,Inc -Dublin Project Unocal Reported <br /> 6747 Sierra Court Suite J project Number Unocal# 1205 0$-Feb-01 07 55 <br /> Dublin CA,94568 project Manager Deanna L Harding <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> - - - -- - - --- -- - R orttng Splice Source — - -o/4REC---- ---RFD - - <br /> eP <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1A16024-EPA 5030B[PrT] <br /> prepared&Analyzed. 18-Jan-01 <br /> Blank(1A16024-BLK1) <br /> Ethanol ND500 ugll <br /> ND 50 <br /> tart-Butyl alcohol <br /> Methyl tart-butyl ether ND 2 0 " <br /> Di-tsopropyl ether ND 2 " <br /> Ethyl tent-butyl ether ND 20 <br /> 0 " <br /> tart-Amyl methyl other ND 2 0 " <br /> 1,2-Dwhlorecthane ND 2 0 - <br /> Ethylene dibrorrude NDY 20 " <br /> 51.8 " 500 106 50.1 SO <br /> ro <br /> Surrogate Dib mofluoromethcme " 500 996 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 498 <br /> prepares}&Analyzed 18-Jan-01 <br /> LCs(iA16024-BS1) 500 104 �a13o <br /> Methyl tent.-butyl ether 52 0 2 0 ug/l <br /> 56�1 " 50 0 r 112 50.150 . <br /> Surrogate Dib r lmofluoramethane 500 104 50.150 <br /> Surrogate 12-Drchlor+oethane-d4 5I8 " <br /> Source SW101329-06 Prepared&Analyzed 18-Jan-01 <br /> Matrix Spike(lA16024-MSI) 50 0 ND 113 60-150 <br /> Mehyl tett butyl ether 56 3 2 0 u�Jl <br /> 58.0 50 0 116 50-150 <br /> Surrogate Dibromofluoromerhane " 500 Ila 50-150 <br /> Surrogate 1,1-Drchloroethant-d4 551 <br /> Source W 101329-06 prepared&Analyzed 18-Jau-01 <br /> Matrix Spike Dup (1A16024-MSD1) <br /> Mekhyl tent-butyl ether 595 20 USA 50 0 ND 119 60-150 5 53 25 <br /> 50 0 118 50-150 <br /> Surrogate Dibrom58 9 ofluoroinethane " Soo 111 50-150 <br /> Surrogate I 1 Drchloroethane-d4 556 <br /> The results in iters repot,apply to the samples analysed to accordance with the chain of <br /> Sequoia Analytical-Walnut Creek custody document.Mj analytical report must be reproduced rn its entirety <br /> F <br /> Page 13 of 14 <br />