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404 N WEget Lane ' <br /> Sequoia Walnut Creek CA 94598 <br /> FAX{925)988- <br /> 925)988-9%60730 <br /> m%ff Analytical www sequolalabs corn ' <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd, Ste #100 Project Number Arco# 595 Stockton Reported <br /> Rancho Cordova CA, 95670 Project Manager Rusty Benkosky 29-Aug-01 11 26 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1G26012- EPA 5030B (P/T) <br /> Blank(1G26012-BLK1) - Prepared&Analyzed 26-Jul-01 <br /> Ethanol -- - —ND 500 ug/l <br /> tcrt-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether(MTBE) ND 1 0 ' <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 <br /> 1,2-Dichloroethane ND 20 " <br /> Ethylene dibromide ND 20 <br /> Surrogate Drbromofluoromethane 570 T� 500 11450-150 - <br /> Surrogate 1,1-Dichloroethane-d4 550 500 110 _ 50-150 ' <br /> Blank(1G26012-BLK2) Prepared&Analyzed 27-Jul-01 <br /> Ethanol ------- ND Soo ug/l <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether(MTBE) ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl ten-butyl ether ND 20 <br /> tent-Amyl methyl ether _ -ND-- --20- <br /> T <br /> 1,2-Dichloroethane - - - - — �ND- � 20 <br /> Ethylene dibromide - -ND - 20- <br /> Surrogate <br /> 0-Surrogate Dibromofluoromethane 467 500 934 50-150 — <br /> Surrogate 12-Dichloroethane-d4 493 500 986 50-150 <br /> Blank(1G26012iBLK3) - Prepared&Analyzed 28-Jul-01 <br /> Ethanol ND 500 ug/l <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether(MTBE) ND 20 <br /> Di-isopropyl ether NO 20 " <br /> Ethyl tert-butyl ether ND 20 <br /> tert-Amyl methyl ether ND 20 " <br /> 1,2-Dichloroethane ND 20 - - <br /> Ethylene dibromide ND 20 " <br /> Surrogate Drbromofluoromethane 465 500 930 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 504 500 101 50-150 <br /> Sequoia Analytical-Walnut Creek 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 entire <br /> Page 8of 13 <br />