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885 Jarvis <br /> Sequoia Morgan Hill CA 950375037 <br /> Analytical (408)7769600 <br /> FAX(408)782 6308 <br /> www sequoialabs coni <br /> Sector-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNG0371 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/03/04 16 21 <br /> Purgeable Hydrocarbons and Volatile Organic Compounds by EPA method 8260B - Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limn Chits Level Result %REC Limits RPD Limit Notes <br /> Batch 4G23004-EPA 5030B PIT <br /> Blank(4G23004-BLK1) Prepared&Analyzed 07/23/04 <br /> Methyl tert butyl ether ND 0 50 ugll <br /> Gasoline Range Organics(C4 C12) ND 50 " <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 11-Drchloroethane-d4 132 150 93 78-129 <br /> Laboratory Control Sample(4G23004-BSI) Prepared&Analyzed 07/23/04 <br /> Methyl Cert butyl ether 953 0 50 ugll 100 95 63 137 <br /> Benzene 934 050 100 93 69 124 <br /> Toluene 961 050 100 96 78 129 <br /> Ethylbenzene 101 050 100 101 84-132 <br /> Xylenes(total) 310 050 300 103 83-137 <br /> i <br /> Surrogate 11-Dichloroerhane-d4 219 150 88 78-129 <br /> Laboratory Control Sample(4G23004-BS2) Prepared&Analyzed 07/23/04 <br /> Methyl tett-butyl ether 972 050 ug/l 992 88 63 137 <br /> Gasoline Range Organics(C4-C 12) 445 50 440 101 70 124 <br /> Benzene 546 050 640 85 69-124 <br /> Toluene 31 1 050 297 105 78-129 <br /> Ethylbenzene 793 050 696 114 84-132 <br /> Xylenes(total) 395 050 337 117 83-137 <br /> Surrogate 12-Drchloroethane d4 123 250 89 78-119 <br /> Laboratory Control Sample Dup(4G23004-BSD1) Prepared&Analyzed 07/23/04 <br /> Methyl tent butyl ether 842 050 ug/l 100 84 63-137 12 20 <br /> Benzene 937 050 100 94 69-124 03 20 <br /> Toluene 946 050 100 95 78 129 2 20 <br /> Ethylbenzene 100 050 100 100 84 132 1 20 <br /> Xylenes(total) 305 050 300 102 83 137 2 20 <br /> Surrogate 12-Drchloroethane-d4 207 250 83 78-129 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report most be reproduced in its entirety <br /> Page 13 of 24 <br />