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z <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www scquoialabs.com <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P305581 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported: <br /> Sacramento CA,95833 Protect Manager Vernon p Elarth 06/13/03 09 42 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Petaluma <br /> Rcpomng Spike Source 516REC RPD <br /> Analyte Result Iamit units Level Result %REC Lamas RPD /,mut Notes <br /> Batch 3060152-EPA 5030 waters <br /> Blank(3060152-BLK1) Prepared&Analyzed 06/06/03 <br /> Tert-amyl mcthyI ether ND 10 ug/1 <br /> Tert-butyl alcohol ND 20 " <br /> Dr-isopropyl ether ND 10 " <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 Dibromofluoromethane 509 500 102 84-121 <br /> Surrogate 12Dchloroethane-d4 543 " 500 109 74-135 <br /> Surrogate Toluene-d8 544 500 109 84-119 <br /> Laboratory Control Sam le(3060152-BSI) Prepared&Analyzed 06/06/03 <br /> Teri-amyl methyl ether 491 10 u9/1 500 98 70-116 <br /> rt-butyl alcohol 100 20 100 100 62-142 <br /> -isopropyl ether 494 10 Soo 99 71-121 <br /> 1,2-Dichloroethane $24 050 500 105 79-126 <br /> Ethanol 135 100 n 100 135 0-200 <br /> Ethyl tert-butyl ether 496 10 " 500 99 71-110 <br /> Methyl tert-butyl ether 502 050 " 500 100 77-123 <br /> Surrogate Dibromofluoramethane 521 500 104 84-122 <br /> Surrogate 12-Dichloroethane--d4 534 500 107 74-135 <br /> Surrogate Toluene-d8 538 500 108 84-119 <br /> Laboratory Control Sample Du (3060152-BSD1) Prepared&Analyzed 06/06/03 <br /> Tert-amyl methyl ether 483 10 ug/l 500 97 70-116 2 20 <br /> Tert-butyl alcohol 104 20 " 100 104 62-142 4 20 <br /> Di-isopropyl ether 497 to 500 99 71-121 06 20 <br /> 1,2-Dichloroethane 506 050 500 101 79-126 3 20 <br /> Ethanol 153 ]00 100 153 0-200 12 200 <br /> Ethyl tert-butyl ether 490 10 500 98 71-110 1 20 <br /> Methyl tert butyl ether 503 050 500 101 77-123 02 20 <br /> Surrogate Dibromofluoromethane 524 500 105 84-122 <br /> Surrogate 12-Dichloroethaned4 534 500 107 74-135 <br /> Surrogate Toluene-d8 544 " 500 109 84-119 <br /> quoia 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 /> Thu analytical report must be reproduced in its entirety <br /> Page 10 of 13 <br />