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h UP 885 Jarvis Dr Sequoia Morgan 11011,CA 95037 (408)776-9600 iw Analytical FAX(408)782-6308 www sequoialabs Secor-Rancho Cordova Project ARCO#4932, Stockton, CA MLK0860 3017 Kilgore Rd Suite 100 Project Number ARCO#4932, Stockton, CA Reported Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12123112 11141 Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified, BTEXM by EPA 8021B - Quality Control Sequoia Analytical -Morgan Hill Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch 2LO9003-EPA 5030B [PIT[ _ Laboratory Control Sample(2L09003-BSI) Prepared&Analyzed 12/09/02 Benzene 948 050 ug/1 100 948 68 140 Toluene 965 050 100 965 76-127 Ethylbenzene 982 050 100 982 77-130 Xylenes(total) 292 050 300 973 78-128 Surrogate a a a-Trifluorotoluene 104 100 104 55-142 Laboratory Control Sample(2L09003-BS2) Prepared&Analyzed 12/09/02 Gasoline Range Organics(C6-C10) 245 50 USA 250 980 62-134 Surrogate a a a-Trifluorotoluene 11 1 11 100 111 55-142 Laboratory Control Sample Dap(2L09003-BSD1) Prepared&Analyzed 12/09/02 Benzene 919 050 ug/1 10 0 91 8 68-140 3 22 30 Toluene 942 050 100 94 2 76-127 241 30 Ethylbenzene 948 050 10 0 94 8 77-130 352 21 Xylenes(total) 280 050 300 93 3 78-128 420 21 Surrogate a a a-T)ifluorotoluene 931 100 93 1 55-142 Laboratory Control Sample Dup(2L09003-BSD2) Prepared 12/09/02 Analyzed 12/10/02 Gasoline Range Organics(C6-C10) 214 50 ug/l 250 85 6 62-134 13 5 41 Surrogate a,a,a-D-ifluorotoluene 104 100 104 55-142 Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of custody document Unless otherwise stated results are reported on a wet weight basis Als analytical report must be reproduced in its entirety 0 Page 20 of 23