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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> _► Analytical FAX(707)792-1865 <br /> (707)792.0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/18/05 11 34 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPA <br /> Analyte Result limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5010120-EPA 5030E waters 1 EPA 8260B <br /> Matrix Spike Dup(5010120-MSDI) Source P412479-10 Prepared&Analyzed 01/10/05 <br /> Ten-amyl methyl ether 239 50 ug/l 250 ND 96 78-117 2 20 <br /> Benzene 25I 25 250 3 0 99 81-118 1 20 <br /> Tert-butyl alcohol 5300 1000 5000 ND 106 60-147 27 20 RB <br /> Di isopropyl ether 251 50 250 ND 100 70-125 0 8 20 <br /> 12-Dichloroethane 258 25 250 ND 103 77-126 4 20 <br /> Ethanol 2470 5000 5000 ND 49 55-200 61 20 LN <br /> Ethylbenzene 258 25 I' 250 ND 103 89-122 2 20 <br /> Ethyl tert-butyl ether 245 50 250 ND 98 71-120 04 20 <br /> Methyl tert-butyl ether 1220 25 250 970 100 70-122 0 20 <br /> q Toluene 250 25 250 4 3 98 84-119 2 20 <br /> Xylenes(total) 779 25 750 ND 104 86-132 2 20 <br /> *Surrogate Dibromofluoromethane 539 5 00 108 84-121 <br /> Surrogate 1 1-Dichloroethane-d4 531 300 106 74-135 <br /> Surrogate Toluene-d8 523 500 105 84-119 <br /> Surrogate 4-Bromofluorobenzene 522 Soo 104 86419 <br /> I <br /> Batch 5010138-EPA 5030B waters/EPA 8260B <br /> Blank(5010138-BLK1) Prepared&Analyzed 01/11/05 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert butyl ether ND 10 " <br /> Methyl tort-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 489 500 98 84-111 <br /> Surrogate 12-Drchloroethane-d4 491 5 00 98 74-1.35 <br /> Surrogate Toluene-d8 528 5 00 106 84-119 <br /> Surrogate 4 Bromofluorobenzene 515 5 00 103 86-119 <br /> Sequoia Analytical-Petaluma 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 /> Thrs analytical report must be reproduced in its entirety <br /> Page 28 of 33 <br />