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i <br /> 885 Jarvis Dr <br /> Sequoia Map�it Hill,08)776 5037 <br /> 9600 <br /> (408)776 96pQ <br /> 4D— <br /> Analytical www <br /> sequ8) labs82 co 8 <br /> www sequcialabscan <br /> Secor-Rancho Cordova Project ARCO#4932,Stockton,CA MLK0860 <br /> 3017 Kilgore Rd Suite 100 Project Number ARCO 44932,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty 13enkosky 12/23/02 l0 48 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified, BTEXM by EPA 8021B- Quality Control <br /> Sequoia Analytical -Morgan Hall <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2LO3004-EPA 5030B [PIT] <br /> Laboratory Control Sample Du (2L03004-]3SD2) Prepared 12/03/02 Analyzed 12/04/02 <br /> Batch 2LO4003 -EPA 5030BIP/T] <br /> Blank(2L04003-BLK1) Prepared&Analyzed 12/04/02 <br /> Gasoline Range Organics(C6-C10) ND 50 ug/I <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tsrt-butyl ether ND 25 " <br /> Surrogate a a a-Trifluorotoluene 104 100 104 55-142 <br /> Laboratory Control Sample(2L04003-BSI) Prepared&Analyzed 12/04/02 <br /> Benzene 102 050 ug/1 100 102 68-140 <br /> Toluene 103 050 100 103 76-127 <br /> Ethylbenzene 104 050 100 104 77-130 <br /> Xylenes(total) 312 050 300 104 78-128 <br /> Surrogate a a a-Trifluorotoluene 981 100 981 55-142 <br /> Laboratory Control Sample(2L04003-BS2) Prepared&Analyzed 12/04/02 <br /> Gasoline Range Organics(C6-C 10) 224 50 ug/1 250 896 62-134 <br /> Surrogate a a a-Trifluorotoluene 108 100 108 55-142 <br /> Matrix Spike(2L04003-MSI) Source MLK0860-08 Prepared&Analyzed 12/04/02 <br /> Gasoline Range Organics(C6-C 10) 441 50 ug/1 550 ND 802 62-134 <br /> Benzene 951 050 660 ND 144 68-140 QM-07 <br /> Toluene 440 050 397 ND 110 76-127 <br /> Ethylbenzene 929 050 920 ND 101 77-130 <br /> Xylenes(total) 473 050 461 ND 103 78-128 <br /> Surrogate a aa-Trifluorotoluene _ -148 - - -- 100 148 55-142 QM-07 — <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed to accordance with the chain of . <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 16 of 23 <br />