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^� ��®y 819 Striker Avenue,Suite 8 4D- 1 Sacramento,CA 95834 (916)921-9600 Analytical FAX(916)921-0 100 FAX Delta Environmental Consultants(Cameron Park) Project: ARCO 548, Stockton,CA 3330 Cameron Park Dr, Ste 550 Project Number: N/A Reported: Cameron Park CA,95682 Project Manager: Jay Johnson 07/03/01 10:27 Volatile Organic Oxygenated Compounds by EPA Method 8260B - Quality Control Sequoia Analytical - San Carlos Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch 1060101-EPA 5030B (P/T1 Matrix Spike(1060I01-MSI) Source:L106146-01 Prepared:06/22/01 Analyzed:06/23/01 Methyl tert-butyl ether 51.1 2.0 ug/l 50.0 ND 102 60-140 Surrogate:l,2-Dichloroethane-d4 55.4 50.0 111 76-114 Surrogate:Toluene-d8 51.1 50.0 104 88-110 Matrix Spike Dap(I060101-MSDI) Source:L106I46-01 Prepared:06/22/01 Analyzed:06/23/01 Methyl Cert-butyl ether 48.5 2.0 ug/l 50.0 ND 97.0 60-140 5.22 25 Surrogate:1,2-Dichloroelhane-d4 55.1 50.0 110 76-114 �W Surrogate:Toluene-d8 51.3 50.0 103 88-110 Batch 1060123-EPA 5030B [P/T1 Blank(1060123-BLKI) Prepared&Analyzed:06/27/01 oibromoethane ND 2.0 ug/l ichloroethane ND 10 „ Di isopropyl ether ND 2.0 „ Ethyl tert-butyl ether ND 2.0 " Methyl tert-buty]ether ND 2.0 " Tert-amyl methyl ether ND 2.0 " Tert-butyl alcohol ND 100 " Surrogate: l,2-Dichloroethane-d4 46.3 50.0 92,6 76-114 Surrogate:Toluene-d8 52.4 50.0 105 88-110 Blank(1060123-BLK2) Prepared&Analyzed:06/27/01 1,2-Dibromoethane ND 2.0 ug/l 1,2-Dichloroethane ND 2.0 „ Di-isopropyl ether ND 2.0 „ Ethyl tent-butyl ether ND 2.0 „ Methyl tert-butyl ether ND 2,0 " Tert-amyl methyl ether ND 2.0 „ Tert-butyl alcohol ND 100 " Surrogate:1,2-Dichloroethane-d4 47.8 50.0 95.6 76-114 Surrogate:Toluene-d8 53.1 50.0 106 88-110 oia Analytical -Sacramento The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. Page 8of10