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® Sequoia 819 Striker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> iwr www sequoialabs tom <br /> Delta Environmental Consultants(Cameron Park) Project Arco 6100,Tracy,CA <br /> 3330 Cameron Park Dr Project Number N/A Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 02/27/01 17 07 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lima Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1020120-EPA 5030B [P/TJ <br /> Blank(1020120-BLKI) Prepared&Analyzed 02/16/01 <br /> Tert-butyl alcohol ND 200 ug/1 <br /> Methyl tent-butyl ether ND 2 00 <br /> Di-isopropyl ether ND 2 00 " <br /> Ethyl tert-butyl ether ND 2 00 <br /> Tert-amyl methyl ether ND 2 00 " <br /> Ethanol ND 3000 " <br /> Surrogate 12-DCA-d4 492 500 <br /> 984 60-140 <br /> LCS(1020120-BS1) _ Prepared &Analyzed 02/16/01 <br /> Methyl tert-butyl ether 494 2 00 ug/l 500 98 8 60-140 <br /> Surrogate 12-DCA-d4 488 „� <br /> 976 60-140 <br /> *— <br /> Dup(1020120-BSD1) Prepared&Analyzed 02/16/0I <br /> Methyl Cert-butyl ether _ _— 51 2 2 00 ug/I 500 102 60-140 3 58 25 <br /> Surrogate 1 2 DCA-d4 502 500 100 60-140 <br /> MRtrix Spike(1020120-MSI) Source S102102-04 Prepared&Analyzed 02/16/01 <br /> Methyl tert-butyl ether 52 1 200 ug/l 500 ND 104 60-140 <br /> Surrogate 12-DCA-d4 496 "� 500 992 60-140 <br /> Matrix Spike Dup(1020120-MSD1) Source S102102-04 Prepared&Analyzed 02/16/01 <br /> Methyl tert-butyl ether 53 2 2 00 ug/1 500 ND 106 60-I40 209 25 <br /> Surrogate 12-DCA-d4 496 — <br /> 50 D <br /> 992 60-140 <br /> to Anafytica]- Sacramento The result in this report a 1 i <br /> P PP] o the samples araly<ed in acrosdance with the cnarn of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 7 of 9 <br />