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404 N Wlget Lane <br /> Sequoia Walnut G98eek, -9600 <br /> (925)989-9600 <br /> FAX(925)988-%73 <br /> Analytical sequolaiabs <br /> Gettler Ryan,Inc -Dublin Project Unocal <br /> 6747 Sierra Court Saute J Project Number Former Unocal 4 4409 Reported <br /> Dublin CA,94568 Project Manager Deanna L Hardmg 26-Oct-0018 31 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source °/aREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limnt Nates <br /> Batch 0319027-EPA 5030B [PIT] <br /> LCS(0319027-BS2) Prepared 8c Analyzed 20-Oct-00 <br /> Methyl tent-butyl ether 432 20 ug/l 300 864 70-130 <br /> Surrogate Dibromofluoromethane 490 50.0 98.0 50.150 <br /> Surrogate 1,1-Drchlormtham-d4 510 S00 101 SO-150 <br /> Matrix Spike(OJ19027-MSI) Source W010225-02 Prepared 8a Analyzed 19-0ct-00 <br /> Methyl tat-butyl ether 459 20 ug/l 500 ND 918 60-150 <br /> Surrogate Dibromofluoromedhane 490 Soo 98.0 50.150 <br /> Surrogate 1 1Drehioraethmue•d4 48.0 500 96.0 50-150 <br /> Matrix Spike Dup(OJ19027-MMI) Source W010225-02 Prepared&Analyzed 19-0et-00 <br /> Methyl tai-butyl ether 514 20 ugn 500 ND 103 60-150 113 25 <br /> Surrogate Drbromojluoromethmn 490 " Soo 980 SO-Iso <br /> Surrogate 1 2 Dichloroedmne-d4 480 SO 0 96`0 50-150 • <br /> Sequoia Analytical-Walnut Creels The results in flus report apply to the samples analyzed in accordance with the thorn <br /> custody document This analytical report must be reproduced in its enareMW <br /> Page 8 of 9 <br />