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Sequoia on Industria!]toad ' <br /> San Carlos 90 <br /> � Analytical (650)23 2-96960 <br /> 12 <br /> FAX(650)232-96E2 <br /> www scquoialabs oom <br /> Gettler-Ryan/Geostrategies(1) Project Unocal(4) <br /> 6747 Sierra Court, Suite J Project Number- Former Unocal#5098,Stockton Reported <br /> Dublin CA, 94568 Project Manager Deanna Harding 07/01/02 07 46 <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- San Carlos <br /> _ Reporting Spike Source µ %REC - RPD <br /> Analyte Result Limit Units Level Result %REC Lanus RPD Limit Notes ' <br /> Batch 2060023 -EPA 5030B [Pgj <br /> LCS(2060023-BST)_- - - = _ - Prepared&Analyzed 06/14/02 - <br /> Methyl ten-butyl ether 420 10 ug/1 500 840 70-130 ' <br /> Surrogate 1 2-Dichloroethane-d4 508 Soo 102 70-130 <br /> Surrogate Toluene-d8 521 500 104 70-130 <br /> Matrix Spike(2060023-MSI) _ _ - Source L206021__22_ Prepared&Analyzed 06/14/02 <br /> Methyl tert-butyl ether 41 0 1 0 ug/1 500 ND 820 60-140 <br /> Surrogate 1,2-Dichloroethane-d4 522 500 104 70-130 ' <br /> Surrogate Toluene-d8 525 500 105 70-130 <br /> Matrix Spike Dup(2060023-MSDI) Source L206021-22 Prepared&Analyzed 06/14/02 -- <br /> Methyl tert-butyl ether 429 1 0 ug/l 500 ND 85 8 60-140 453 25 , <br /> Surrogate 1,2-Dichloroethane-d4 51 4 500 103 70-130 <br /> Surrogate Toluene-d8 527 500 105 70-130 <br /> Batch 2060028-EPA 5030B P/T <br /> Blank(2060028-BLK1) Prepared&Analyzed 06/18/02 <br /> 1,2-Dibromoethane ND 10 ug/l <br /> NTD 1 0 rr <br /> Di isopropyl ether ND 10 <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl etherND J 0 <br /> Teri-amyl methyl ether T -- ND -- 10 - <br /> -'Pert-butyl alcohol -- - - - ND --- - - 20 - - — <br /> Surrogate 1 2-Dichloroethane-d4 496 Soo 992 70-130 e <br /> Surrogate Toluene-d8 496 500 992 70-130 <br /> Sequoia Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 96 of 103 , <br />