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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento, CA 95834 <br /> (916)921-9600 <br /> • An �fir al FAX(916)421-0700 <br /> a i i www.sequotalabs.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 15:42 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %R-FC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2010035-EPA 5030B [PITT <br /> _LCS(2010035-BSI) Prepared&AnaIyzed: 01/04/02 <br /> Methyl tert-butyl ether 22.5 0.50 ug/l 25.0 90.0 60-140 <br /> Surrogate:1,2-DCA-d4 27.6 25.0 710 60-140 - <br /> Matrix Spike(2010035-MS1) Source: 5112387-05 Prepared&Analyzed: 03/04/02 <br /> Methyl tert-butyl ether 20.9 0.50 ug/l 25.0 ND 93.6 60-140 <br /> Surrogate:l,2-DCA-d4 27.7 25.0 111 60-140 __ <br /> Matrix Spike Dup(2014035-MSD1) Source: S112387-05 Prepared&Analyzed:01/04/02 <br /> Methyl tett-butyl ether 26.1 0.50 ug/1 25.0 ND 104 60-140 22.1 25 <br /> Surrogate:1,2-DC4-d427-9 25.0 112 60-140 ---- -- <br /> AdLtch 2010063-EPA 5030E (PIT <br /> Iqw <br /> Blank(2010063-BLKI) Prepared&Analyzed: 01/07/02 <br /> Tert-butyl alcohol ND 5.0 ug/I - <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•amy]methyl ether ND 0.50 " <br /> Ethanol ND 50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethylene dbromide ND 0.50 " <br /> Surrogate:1,2-DC4-d4 26.2 15.0 105 60-140 T <br /> LCS(2010D63-BS1) Prepared&Analyzed: 01/07/02 <br /> Methyl tert-butyl ether 23.1 0.50 ug/l 25.0 92.4-60-140 ------- <br /> Surrogate:1,2-DCA-d4 25.7 <br /> 25.0 103 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 12 of 14 <br />