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1455 McDowell Blvd,North Ste D <br /> ., Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> ��► Analytical FAX(707)792-0342 <br /> www segwmlabs.com <br /> URS Corp-Sacramento Project. Arco Site 2168,Stockton,CA P305581 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number VM6590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elattti 06/13/03 09 42 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPD <br /> LL <br /> Result Lunit Units Level Result YOUC Limits RPD Limit Notes <br /> Batch 3060221 -EPA 5030 waters <br /> Blank(3060221-BLKI) Prepared&Analyzed 06//10/03 <br /> Tert-amyl methyl ether ND 10 119/1 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate Dibromofluoromethtme 492 500 98 84-122 <br /> Surrogate 12-Dichloroeihane-d4 486 500 97 74-135 <br /> Surrogate Toluene-d8 496 500 99 84-119 <br /> Laboratory Control Sample(3060221-BSI) Prepared&Analyzed 06/10/03 <br /> W-amyl methyl ether 484 10 ug(l 500 97 70-116 <br /> .t-b.tyl alcohol 969 20 100 97 62-142 <br /> Di-isopropyl ether 472 10 500 94 71-121 <br /> 1,2-Dibromoethane(EDB) 533 050 500 107 92-117 <br /> 1,2-Dichloroethsne 491 050 500 96 79-126 <br /> Ethyl tert butyl ether 461 10 " 500 92 71-110 <br /> Methyl tent-butyl ether 472 050 Soo 94 77-123 <br /> Surrogate Dtbromofluoromethane 496 500 99 84-122 <br /> Surrogate 12-Dichloroethane-d4 479 500 96 74-135 <br /> Surrogate Toluene48 496 500 99 84-119 <br /> Matnz Spike(3060221-MSI) Source P306035-02 Prepared&Analyzed 06/10/03 -- -- <br /> Tett-amyl methyl ether 247 50 ug/l 250 ND 99 70-116 <br /> Tertbutyl alcohol 503 100 500 33 94 62-142 <br /> Di-isopropyl ether 230 50 250 ND 92 71-12I <br /> 1,2-Dibromoethane(EDB) 262 25 250 ND 105 92-117 <br /> 1,2-Dichlorocthane 237 25 250 ND 95 79-126 <br /> Ethyl cert-butyl ether 227 50 250 ND 91 71-110 <br /> Methyl tert-butyl ether 235 25 250 ND 94 77-123 <br /> Surrogate Dibromofluoromethane 472 500 94 84-122 <br /> Surrogate 12-Dichloroethane-d4 446 500 89 74-135 <br /> Surrogate Toluene-d8 486 500 97 84-119 <br /> quoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chair of <br /> custody document Unless otherwise stated results the reported on a wet weight basis <br /> Thu analytical report must be reproduced in its entirety <br /> Page 11 of 13 <br />