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B 19 Sinker Avenue,Suite B <br /> Sequoia Sacramento,CA 9600 <br /> 99600 <br /> 5834 <br /> (91fi)921 <br /> Analytical FAX(916)921 0100 <br /> www scquWalabs corn <br /> ratus Environmental Project Arco 2130,Stockton,CA <br /> 330 Cameros Park Drive,Ste 550 Project Number 2130,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 06/25/02 13 58 <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 2060216-EPA 5030B [P/TI <br /> Blank(2060216-BLKI) Prepared&Analyzed 06/18/02 <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 /> Tort-amyl methyl ether ND 050 " <br /> Ethanol ND 50 " <br /> Surrogate 12 DCA-d4 264 250 106 60-140 <br /> LCS(2060216-BSI) Prepared 06/18/02 Analyzed 06/19/02 <br /> Methyl tert-butyl ether 21 9 050 ug/l 250 88 60-140 <br /> Surrogate 1 2-DCA-d4 260 11250 104 60-140 <br /> Matrix Spike(2060216-MS1) Source 5206223-07 Prepared 06/18/02 Analyzed 06/19/02 <br /> Allkkthyl tert-butyl ether 21 9 050 ug/l 250 ND 88 60-140 <br /> un agate 12-DCA-d4 259 250 104 60-140 <br /> Matrix Spike Dup(2060216-MSDI) Source 5206223-07 Prepared 06/18/02 Analyzed 06/19/02 <br /> Methyl tert-butyl ether 21 4 050 ug/l 25 0 ND 86 60-140 2 25 <br /> Surrogate 1 1-DCA d4 259 250 104 60-140 <br /> Batch 2060248-EPA 5030B [P/T] <br /> Blank(2060248-BLKI) Prepared&Analyzed 06/20/02 <br /> 'Pert 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 12-DCA d4 286 250 114 60-140 <br /> nota 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 Page 8 of 10 <br />