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885 Jarvis t)rive <br /> Sequoia Morgan Hill CA 95037 <br /> (408)776 9600 <br /> � Analytical www <br /> seq(408)782-6308 <br /> om <br /> www sequoialabs com <br /> 0 <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133,Stockton,CA MPCO263 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133, Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Bnan Carey 03/31/06 14 03 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6C16016- EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample(6C16016-BSI) Prepared&Analyzed 03/16/06 <br /> Chlorobenzene 216 050 Ug/1 200 108 80-120 <br /> 1 2 Dichlorobenzene 207 050 200 104 80-125 <br /> 1,3 Dichlorobenzene 208 050 200 104 75-120 <br /> 1,4-Dichlorobenzene 194 050 200 97 75-120 <br /> Surrogate 1 2-Dtchloroelhane-d4 509 500 102 60-135 <br /> Surrogate 4-Bromofluoroben_ene 506 500 101 70-120 <br /> Surrogate Dibromofluoromelhane 558 500 112 65-130 <br /> Surrogate Toluene-d8 543 500 109 70-120 <br /> Laboratory Control Sample Dup(6C16016-BSDI) Prepared&Analyzed 03/16/06 <br /> Chlorobenzene 218 050 ugA 200 109 80-120 09 10 <br /> 04 <br /> Dichlorobenzene 216 050 200 108 80-125 4 10 <br /> ichlorobenzene 21 9 050 200 110 75-120 5 10 <br /> 4 Dichlorobenzene 204 050 200 102 75-120 5 15 <br /> Surrogate 1 2-Dichloroethane-d4 525 500 105 60-135 <br /> Surrogate 4-Bromofluoroben.-ene 513 500 103 70-120 <br /> Suirogate Dibromofluoromethane 558 500 112 65-130 <br /> Sturogate Toluene-d8 532 500 106 70-110 <br /> Batch 6C16020- EPA 5030B PIT/EPA 8260B <br /> Blank(6C16020-BLKI) Prepared&Analyzed 03/16/06 <br /> tert Amyl methyl ether ND 050 ugA <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 <br /> Di isopropyl ether ND 050 " <br /> 12-Dibromoethane(EDB) ND 0 50 " <br /> 1 2 Dichloroethane ND 0 50 Pi: <br /> Ethanol ND 300 IC <br /> Ethyl tert-butyl ether ND 050 " <br /> Lthylbenzenc ND 050 " <br /> Methyl tert-butyl ether ND 050 <br /> roluene ND 050 " <br /> Xylenes(total) 0 500 0 50 " <br /> Gasoline Range Organics(C4-C 12) ND 50 " <br /> .Surrogate 1 2-Dichloroethane-d4 192 250 77 60-135 <br /> Sui rugate Toluene-d8 250 250 100 70-120 <br /> ,4rquoia Analytical - Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 17 of 20 <br />