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404 N Wlget[ane <br /> Walnut Creek,CA 94598 <br /> Sequoia (925)988-9600 <br /> FAX(9z5)988-%73 <br /> Analytical www sequolalabs corn <br /> *ttlerRyan,Inc <br /> _n Dublin Project Unocal <br /> 6747 Sierra Court Suite 7 ProjectNumber Unocal#0187 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 14-Mar-01 10 19 <br /> Volatile Organic Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunn Units Level Result %REC Limits RPD Lunt Notes <br /> Batch 1C07012-EPA 5030B(PIT) <br /> LCS(1C07012-BSI) Prepared&Analyzed 08-Mar-01 <br /> Methyl tart-butyl ether 551 20 ug/l 500 110 70-130 <br /> Surrogate Dibromofluoromethane 530 500 106 so-Iso <br /> Surrogate 12-DrcNoroethaw-d4 445 500 890 50-150 <br /> Matrix Spike(IC07012-MSI) Source W102365-05 Prepared&Analyzed 08-Mar-01 <br /> Mathyl tart-butyl ether 441 20 ug/l Soo ND 882 60-150 <br /> Surrogate Dibromofluoromethane S10 Soo 102 50-150 <br /> Surrogate 1 2 Dichloroethame-d4 3&4 500 768 50-150 <br /> Matrix Spike Dup(1007012-MSDI) Source W102365-05 Prepared&Analyzed 08-Mar-01 <br /> Methyl tent-butyl ether 476 20 ug/i 500 ND 952 60-150 763 25 <br /> Surrogate Dibromofluoromethane 519 " 500 104 50-150 <br /> Sr to 1 2 Dichlowethane-d4 397 500 794 50-150 <br /> B 1C09010-EPA 5030B(PM <br /> Blank(1009010-BLKI) Prepared&Analyzed 09-Mar-01 <br /> tent-Butyl alcohol ND 50 ug/l <br /> Methyl tert-butyl ether ND 20 " <br /> Dr-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Dibramofluoromethane 533 500 107 50-150 <br /> Surrogate 1 2-Drchloroethane-d4 470 Soo 940 50-150 <br /> Blank(IC09010-BLK2) Prepared&Analyzed 12-Mar-01 <br /> tert-Butyl alcohol ND 50 ug/i <br /> Methyl tert-butyl ether ND 20 " <br /> Dr-isopropyi ether ND 20 " <br /> Ethyl tart-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromethane 498 Soo 996 50.150 <br /> Surrogate 1 2Dchloroethane-d4 409 500 818 50-150 <br /> S*a Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Tins analytical report must be reproduced in its entirety <br /> Page 26 of 32 <br />