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819 Sinker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> qwrAnalytical FAX(916)921-0100 <br /> www sequoialabs com <br /> elta Environmental Consultants(Cameron Park) Project Arco 6100,Tracy,CA <br /> 330 Cameron Park Dr Ste 550 Project Numbet Arco 6100,Tracy,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 01/23/02 11 25 <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 2010248-EPA 5030B [P/'1'] <br /> Blank(2010248-BLK1) Prepared&Analyzed 01/21/02 <br /> Tert-butyl alcohol ND 0 050 mg/kg <br /> Methyl tert-butyl ether ND 00050 " <br /> Di-isopropyl ether ND 00050 " <br /> Ethyl tert-butyl ether ND 00050 " <br /> Tert-amyl methyl ether ND 00050 <br /> Ethanol ND 020 " <br /> Surrogate 1 2-DCA-d4 00368 00430 856 60-140 <br /> LCS(2010248-BSI) Prepared&Analyzed 01/21/02 <br /> Methyl tert-bury]ether 0,0441 00050 mg/kg 00500 88 2 60-140 <br /> Surrogate 1 2-DCA-d4 00406 " 00430 944 60-140 <br /> Matrix Spike(2010248-MS1) Source 5201309-03 Prepared&Analyzed 01/21/02 _ <br /> yl tert-butyl ether 00419 00050 mg/kg 00500 ND 83 5 60-140 <br /> rrogate 1 2-DCA-d4 00385 " 00430 895 60-140 <br /> Matrix Spike Dup(2010248-MSDI) Source 5201309-03 Prepared&Analyzed 01/21/02 <br /> Methyl tert-butyl ether 00454 00050 mg/kg 00500 ND 905 60-140 802 25 <br /> Surrogate 12-DCA-d4 00402 " 00430 935 60-140 <br /> Batch 2010260-EPA 5030E [MeOH] <br /> Blank(2010260-BLKI) Prepared&Analyzed 01/22/02 —_ <br /> Tert-butyl alcohol ND 1 0 mg/kg <br /> Methyl tert-butyl ether ND 010 " <br /> Di-isopropyl ether ND 010 " <br /> Ethyl tert-butyl ether ND 010 <br /> Tert-amyl methyl ether ND 0 10 " <br /> Ethanol ND 10 " <br /> Surrogate 12-DCA-d4 249 250 996 60-140 <br /> uoia Analytical - Sacramento The results to 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 15 of 17 <br />