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Sequoia CA 404 N Lane <br /> Walnut Creek CA 94598 <br /> 4 {925)988-9600 <br /> Analytical www <br /> 989673 <br /> sequequ8-olalabs coin <br /> Gettler Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosco# 11192,Stockton Reported <br /> Dublin CA,94568 Project Manager Doug Lee 09-Jan-01 18 05 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source °/aREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lunit Notes <br /> Batch OL27013-EPA 5030B [PIT] <br /> Blank(OL27013-BLK4) Prepared&Analyzed 08-Jan-01 <br /> Ethanol ND 500 ug4 <br /> tett-Butyl alcohol ND 50 " <br /> Methyl tent-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl text-butyl ether ND 20 " <br /> tett-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofhtoromethane 470 500 940 50-150 <br /> Surrogate 1 2 Dichloroethow-d4 390 Soo 7&0 so-Iso <br /> LCS(OL27013-BS1) Prepared&Analyzed 27-Dec-00 <br /> Methyl tett-butyl ether 400 40 U94 500 800 70-130 <br /> gate Dibromofluoromethane 490 H' 500 9&0 50-150 <br /> gate 1,2-1)tchloroethone-d4 440 SOD 8&0 50-150 <br /> LCS(OL27013-BS2) Prepared&Analyzed 28-Dec-00 <br /> Methyl tert-butyl ether 425 20 ug/l 500 850 70-130 <br /> Surrogate Dtbromofluoromethane 500 Soo 100 50-150 <br /> Surrogate 11-Dichloroelhane-d4 450 500 900 50-150 <br /> LCS(OL27013-BS3) Prepared&Analyzed 05-Jan-01 <br /> Methyl tort-butyl ether 499 20 11g/I 500 998 70-130 <br /> Surrogate Dibromofluaromethane 470 " 500 940 50-150 <br /> Surrogate 1 2 Diehloroethane-d4 400 500 800 50-150 <br /> LCS(OL27013-BS4) Prepared&Analyzed 08-Jan-01 <br /> Methyl teat-butyl ether 413 20 119/1 500 826 70-130 <br /> Surrogate Dibromofhroromethane 480 500 960 50-150 <br /> Surrogate 1,1-Drchloroedume-d4 38.0 " 500 760 50.150 <br /> 1a Analytical-Walnut Creek The results in this report apply to the samples analyzed to awordmce with the chain of <br /> custody document Tins analytical report must be raeproduced in its entirety <br /> Page 6of8 <br />