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819 Striker Avenue Suite 8 <br /> ` y Sequoia Sacramento CA 95834 <br /> 4. (916)92 t-9600 <br /> FAX(916)921-0100 <br /> Analytical <br /> r�lT7tical www sequoialabs cam <br /> ` C'� L8. Jul C_. <br /> Delta Environmental Consultants(Cameron Park) Project ARCO 2168,Stockton,CA <br /> 3330 Cameron Park Dr Project Number NIA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 03/02/01 i 5 32 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1020305-EPA 5030B [PIT] <br /> LCS (1020305-BS1) Prepared&Analyzed 02/28/01 <br /> Methyl Cert-butyl ether 512 200 ua/l 500 102 60-140 <br /> Suri ogate 1 2-DCA-d4 507 500 101 60-140 <br /> LCS Dup(1020305-BSDI) Prepared&Analyzed 02/28/01 <br /> Methyl tert-butyl ether 559 200 ug/I 500 112 60-140 978 25 <br /> Surrogate 12 DCA-d4 579 500 116 60-140 <br /> Matrix Spike(1020305-MSI) Source 5102246-08 Prepared&Analyzed 02/28/01 <br /> Methyl tert-butyl ether 115 200 ua/l 500 574 115 60-140 <br /> Surrogate I 1-DCA-d4 609 Soo 122 60-140 <br /> Matrix Spike Dup(1020305-MSD1) Source 5102246-08 Prepared&Analyzed 02/28/01 <br /> Adikkhvl tert-butyl ether 114 200 uSA 500 574 113 60-140 0 873 25 <br /> rugate 12-DCA-d4 558 '� 500 112 60-140 <br /> oroia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Thu analytical report crust be reproduced in is ertirery <br /> Page 14 of 16 <br />