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819 Striker Avenue,Suite 8 <br /> 1 S e qu o ai a Sacramento,CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www.sequolalabs.com <br /> Delta Environmental Consultants(Cameron Park) Project: ARCO 5469,Stockton,CA <br /> 3330 Cameron Park Dr. Ste 550 Project Number: 5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Steve Carter 01/08/02 ISA2 <br /> Volatile Organic Compounds by EPA Method 8260B - 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 1120325-EPA 5030B [PIT] <br /> Blank(1120325-BLKl) Prepared&Analyzed: 12/28/01 <br /> Tert-butyl alcohol ND 5.0 ugA <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Tert-amyl methyl ether ND 0.50 " <br /> Ethanol ND 50 " <br /> 1,2-Dichlomethane ND 0.50 " <br /> Ethylene dibromide ND 0.50 " <br /> Surrogate,-1,2-DCA-d4 27.5 25.0 110 60-140 <br /> CS(1120325-BSI) Prepared&Analyzed: 12/28/01 <br /> ethyl tert-butyl ether 25.7 0.50 ugl] 25.0 103 60-140 <br /> Surrogate: 1,2-DCA-d4 18.1 25.0 111 60-140 <br /> _Matrix Spike(112032.5-MSI) _ Source: SI12225-02 Prepared&Analyzed: 12/28/01 <br /> Methyl tert-butyl ether 23.8 0.50 ug/l 25.0 ND 95.2 60-140 <br /> Surrogate:1,2-DCA-d4 26-6 25.0 106 60-140 <br /> Matrix Spike Dup(i 120325-MSDI) Source: 5112225-02 Prepared&Analyzed: 12/28/01 <br /> Methyl tert-butyl ether 25.1 0.50 ug/l 25.0 ND 100 60-140 5.32 25 <br /> Surrogate:1,1-DCA44 _ 28.4 25.0 114 60-140 <br /> Batch 2010035-EPA 5030B [PIT] <br /> Blank(2010035-BLKI) Prepared&Analyzed: 01/04/02 <br /> Tert-butyl alcohol ND 5.0 ug/l <br /> Methyl tert-butyl ether ND 0.50 <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Tert-amyl methyl ether ND 0.50 " <br /> Ethanol AID 50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethylene dibromide ND 0.50 " <br /> Surrogate:1,2-DCA-d4 17.1 25.0 109 60-140 <br /> quoia Analytical-Sacramento 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 11 of 14 <br />