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819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> Sequoia (916)921-9600 <br /> ez_ FAX(916)921-0100 <br /> Analytical www sequoialabs com <br /> I33elEnvironmental Consultants(Cameron Park) Project ARCO 2186,Stockton,CA <br /> 30 Cameron Park Dr Ste 550 Project Number 2186,Stockton,CA Reported <br /> ameron Park CA,95682 Project Manager Steve Carter 04/25/02 09 59 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source °/6REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2030197-EPA 5030B PIT] <br /> Blank(2030197-BLK1) Prepared&Analyzed 03/15/02 <br /> Tert-butyl alcohol ND 50 ug/l <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> Ethanol ND 50 <br /> Surrogate 1,2-DCA-d4 223 250 892 60-140 <br /> LCS(2030197-BS1) Prepared&Analyzed 03/15/02 <br /> Methyl tert-butyl ether 23 5 050 ug/1 250 940 60-140 <br /> Surrogate 12-DCA-d4 215 25 0 860 60-140 <br /> Matrix Spike(2030197-MS1) Source S203225-01 Prepared&Analyzed 03/15/02 <br /> ethyl tert-butyl ether 22 3 050 ug/1 250 ND 892 60-140 <br /> urrogate 12-DCA-d4 20 7 " 250 828 60-140 <br /> Matrix Spike Dup(2030197-MSD1) Source 5203225-01 Prepared&Analyzed 03/15/02 <br /> Methyl tert-butyl ether 238 050 ug/1 250 ND 952 60-140 651 25 <br /> Surrogate 12-DCA-d4 210 250 840 60-140 <br /> Batch 2030202-EPA 5030B [P/TJ <br /> Blank(2030202-BLK1) Prepared&Analyzed 03/15/02 <br /> Tert-butyl alcohol ND 50 ug/1 <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 <br /> Tert-amyl methyl ether ND 050 <br /> Ethanol ND 50 " <br /> Surrogate 1 2-DCA-d4 189 25 0 756 60-140 <br /> quoia Analytical - Sacramento The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> Page Page 10 of 13 <br />