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Sequoia 1551IlosC alRoad <br /> 1(05� <br /> San Carlos CA 94070 <br /> 4W Analytical FAX(650}232-9600 <br /> (650)232-961 <br /> www sequoialabs eom <br /> ettler-Ryan/Geostrategies(1) Project Unocal(4) <br /> 7 Sierra Court, Suite J Project Number Former Unocal#5098,Stockton Reported <br /> Im 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 /> Ana] a Reporting Spike Source %REC PPD <br /> � Result Lunn Units Level Result %REC Lunits RPD Limit Nates <br /> tch 2060021 -EPA 5030E PIT <br /> nk(2060021-BLK1) Prepared&Analyzed 06/13/02 <br /> 1,2-Dibromoethane ND 10 ug/l <br /> IDichloroethane ND 10 " <br /> sopropyl ether ND 10 „ <br /> Ethyl tent-butyl ether ND 10 " <br /> t <br /> yl Cert-butyl ether ND 10 " <br /> amyl methyl ether ND 10 " <br /> Pert-butyl alcohol ND 20 „ <br /> ogare 1,2-Dichloroethane-d4 538 Soo 108 70-130 <br /> agate Toluene-d8 500 500 100 70-130 <br />,CS(2060021-BS1) Prepared&Analyzed 06/13/02 <br /> Rhyl tent-butyl ether 430 10 ug/l 500 860 70-130 <br /> ogare 1,2-Dichloroeihane d4 .512 500 102 70-130 <br /> arrogate Toluene-d8 320 500 104 70-130 <br /> Spike(2060021-MS1) Source L206021-06 Prepared&Analyzed 06/13/02 <br /> tert-butyl ether 432 10 ug/l 500 ND 864 60-140 <br /> 1,2-Dichloroethane-d4 506 500 101 70-130 <br /> ogate Toluene-d8 534 500 107 70-130 <br />#ogate <br /> rix Spike Du (2060021-MSDI) Source L206021-06 Prepared&Analyzed 06/13/02 <br /> f,te tert-butylether 44 5 10 ug/l 500 ND 890 60-!40 296 25 <br /> 1 2-Dichloroethane-d4 516 Soo 103 70-130 <br /> arrogate Toluene-d8 533 Soo 107 70-130 <br /> ch 2060023 -EPA 5030B PIT <br /> Wk(2060023-BLKI) Prepared&Analyzed 06/14/02 <br /> 2-Dibromoethane ND 10 ugA <br /> I ichloroethane ND 10 " <br /> -propyl ether ND 1 0 " <br /> hyl tert-butyl ether ND 1 0 " <br /> It <br /> tent-butyl ether ND 1 0 " <br /> rayl methyl ether <br /> rt-butyl alcohol ND 20 " <br /> agate 1 2-Dichloroethane-d4 547 SO 0 109 70-130 <br /> gate Toluene-d8 506 500 101 70-130 <br /> Nola Analytical- San Carlos The results in this report apply to the samples analyzed to accordance with the charas of <br /> custody document This analytical report must be reproduced in Is.entirety <br /> Page 95 of 103 <br />