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Sequoia . 819 Striker Avenue. Suite 8 <br /> Sacramento,CA 95834 <br /> Analytical (916)921-9600 <br /> FAX(916)92 1-0 100 <br /> Emcon-Cameron Park <br /> Project: ARCO 2186,Stockton Sampled: 6/24/99 to 6/25/99 <br /> 3939 Cambridge Road,Ste,202 Project Number: N/A <br /> Cameron Park,CA 95682Received: 6/25/99 <br /> Project Manager: Mark Caps Reported: 7111199 <br /> Volatile Oxygenate Compounds by!EPA Nietllod 8260A./Qualify Control <br /> n� ;Se u0ta Anal T.!'. <br /> �. x:,..._.; -Yf!., 5;acramerito s <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits °/a Limit % Notes* <br /> 4070QT5-M51?1 5906437-11 <br /> Surrogate: 1,2-DCA-d4 7/8/99 2.Batch: 9070121 50 2.50 mg/kg 60.0-140 100 <br /> Date Pre ared•,7/9/99 <br /> BlankTert-butyl alcohol 7/9/9IK1 <br /> Methyl tert-butyl ether ND mg/kg 10.0 <br /> Di-isopropyl ether ND 0.100ND <br /> Ethyl tert-butyl ether 0.100 <br /> " <br /> Tart-amyl methyl ether �� ND 0.100ND <br /> Ethanol. 0.100 <br /> SuND 150 <br /> rrogate: 1,2-DCt1-d4 1.50 1.90 <br /> 60.0-140 116 <br /> LCS <br /> 9070121-851 <br /> Methyl tert-butyl ether 719/99 2.50 2.51 mg/kg 70.0-130 <br /> Surrogate: 1,1-DCA d4 2 SO 2,92 <br /> 60.0-140 1 10017 <br /> Matrix Spike <br /> 9-Mi11►153 5906437y <br /> Methyl tort-butyl ether 7/9/99 2.50 ND 2.41 /k <br /> Surrogate: 1,2-DC.4-d4 m$ g 60.0-140 96.4 <br /> 2.50 2.46 60.0-140 98.4 <br /> matrix*Spike nun 9M121-MSDI 5906437-15 <br /> Methyl tart-butyl ether 7/9/99 2.50 <br /> Surrogate: 1,2-DC,444 1\1D 2'39 mg/kg 60.0-140 95.6 25.0 0.833 <br /> '� 2.50 2.46 60.0-140 98.4 <br /> i <br /> Sequoia Analytical-Sacramento <br /> *Refer to end of report for text of res and deftnitiour. <br /> Page 15 of 16 <br />