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1455 McDowell Blvd,North Ste D <br /> a <br /> Sequoia Petalmma,CA 94954 <br /> L. Mai (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs cum <br /> i <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P306252 <br /> 2870 Gateway Oaks Drive Saute 300 Project Number lntrim-50293 Reported- <br /> Saeramento CA,95833 Project Manager Vernon P Elarth <br /> 06/27/03 17 13 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Repottmg Spike Source °/"REC RPD <br /> Analyte Result Lunt 1jnts: Level Result %RW Lmuts RPD Lima Notes <br /> Batch 3060638-EPA 5030 waters <br /> Laboratory Control Sample Dup(3060638-BSD1) Prepared&Analyzed 06/25/03 <br /> Tert-amyl methyl ether 495 10 ug/1 500 99 70-116 0 2 20 <br /> Tert-butyl alcohol 113 20 n100 113 62-142 3 20 <br /> Di-isopropyl ether 4 81 10 " 500 96 71-121 1 20 <br /> Ethyl tert-butyl ether 4 61 10 500 92 71-110 2 20 <br /> Methyl tert butyl ether 505 050 500 101 77-123 0 6 20 <br /> Surrogate Dibromofluoromethane 473 500 95 84-122 <br /> i <br /> Surrogate 12-Dtchloroethane-d4 498 500 100 74-135 <br /> Surrogate Toluene-d8 511 ^ 500 102 84-119 <br /> I <br /> Batch 3060661 -EPA 5030 waters <br /> Blank(3060661-BLK1) Pre ared&Analyzed 06/25/03 <br /> ert-amyl methyl ether ND 1 0 ugll <br /> butyl alcohol ND 20 ^ <br /> t-isopropyl ether ND 10 " <br /> Ethanol 104 100 " <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate Dibromofluoromethane 401 450 89 84-122 <br /> Surrogate 12-Dichloroethaned4 414 " 450 92 74-135 <br /> Surrogate Toluene-d8 4 71 450 105 84-119 <br /> Laboratory Control Sample(3060661-BSl) Prepared 06/25/03 Analyzed 06/26/03 <br /> Tert-amyl methyl ether 462 10 ug/1 500 92 70-116 <br /> Tert-butyl alcohol 793 20 100 79 62-142 <br /> Di-isopropyl ether 449 10 500 90 71-121 <br /> Ethyl tent-butyl ether 471 1 0 Soo 94 71-110 <br /> Methyl tert-butyl ether 384 050 " 500 77 77-123 <br /> Surrogate Drbromofluoromethane 429 " 450 95 84-122 <br /> Surrogate 1 2Dchloroethane-d4 413 450 92 74-135 <br /> Surrogate Toluene-d8 4 77 450 106 84-119 <br /> I <br /> O <br /> uo1a 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 /> Titus analytical report must be reproduced in its entirety <br /> Page 25 of 27 <br />