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404 N Wiget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> (925)988-9600 <br /> Analytical FAX (925)988-9673 <br /> Gettler Ryan,Inc -Dublin Project Unocal <br /> 6747 Sierra Court Suite J Project Number Unocal 40187 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 09-Mar-00 10 44 <br /> Volatile Organic Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> A y Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 0008023 -EPA 5030B[PIT] <br /> LCS(0008023 BSI) Prepared&Analyzed 07-Mar-00 <br /> Methyl.tent-butyl ether 467 2 0 ugfl 50 0 93 4 70-130 <br /> Surrogate Dibromofluoromethone 490 n 500 980 50-150 <br /> Surrogate 1 1-Drchloroethane-d4 46.0 500 910 50-150 <br /> LCS(0008023-BS2) Prepared&Analyzed 08-Mar-00 <br /> Methyl tent-butyl ether 63 1 20 ug11 500 126 70-130 <br /> Surrogate Drbromofhroromethane 610 Soo 124 50-150 <br /> Surrogate 1 1-Dichloroethane-d4 580 500 116 50.150 <br /> Matnx Spike(0008023-MSI) Source W002567-02 Prepared&Analyzed 07-Mar-00 <br /> Methyltert-butyl ether 410 20 ug/1 500 ND 920 60-150 <br /> Surrogate Dibromofluoromethane 450 Soo 900 50-150 <br /> SIVto 1 1 Dichloroetham-d4 440 500 880 50.150 <br /> Matrix Spike Dup(0008023-MSDI) Source W002567-02 Prepared&Analyzed 07-Mar-00 <br /> Methyl tort-butyl ether 47 b 2 0 upfl 54 0 ND 95 2 60-154 149 25500 <br /> 5 <br /> Surrogate Dib romofluoromethane 450 50 0 90 0 50.150 <br /> Surrogate 11-Dichloroeihane-d4 440 <br /> 50 0 88 0 50.1 SO <br /> The results to this report apply to the samples analyzed in accordance with the chain of <br /> is Analytical-Walnut Creek <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 21 of 22 <br />