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9 1455 MLDowelt Blvd North Sic D <br /> e(I U ill1 Petaluma CA 949?4 <br /> Analytical <br /> nal 'tica (707)792-014FAX(707)792-01422 <br /> %-ww sequoialabs coni <br /> URS Corp-SdLI`Jf11Cnt0 Project Arco Site 5469 Stockton CA P403099 <br /> 2870 Gateway Oaks Drive Sinte 300 Project Nutuber WR36605 Reported <br /> Sacramento CA 95833 Project Manager Jay Johnson 04/06/04 17 16 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source "/REC RPD <br /> Analyte Result [ unit Units Lceel Result %REC Limits RPD Lintrt Notes <br /> Batch 4030493-EPA 5030E waters <br /> Laboratory Control Sample(4030493-BS1) Prepared&Analyzed 03/18/04 <br /> Tert-amvl inethvl ether 4 75 10 ug/l 5 00 95 7b-117 <br /> Benzene 4 70 0 50 5 00 94 81-118 <br /> Tert-butyl alcohol 99 3 20 t00 99 60-147 <br /> Di-isopropyl ether 5 09 10 5 00 102 70-125 <br /> 1 2-Dibromoetbine(EDB) 4 65 0 50 5 00 93 55-125 <br /> 12-Dichloroethane 4 74 0 50 5 00 95 77-126 <br /> Ethanol 205 100 100 205 55-200 QCOI <br /> Fthylbctuene 450 0 50 5 00 90 89-122 <br /> Ethyl tert-butvl ether 5 12 10 5 00 102 71-120 <br /> Methyl tert-butyl ether 5 02 0 50 5 00 100 70-122 <br /> Toluene 4 43 0 50 5 00 89 84-119 <br /> nes{total) 13 6 0 50 is 0 91 86-132 <br /> ingale nihromollrio anuthanc 5 89 600 98 84-123 <br /> Suiiogatc I2-Dichloiotthairc-d4 5 51 600 92 74-135 <br /> Suiiogatc Tohtene-d8 5 98 6 00 100 84-119 <br /> Surrogate 4-Bioiruothimohcx_eire 6 35 h 00 104 86-119 <br /> Matrix Spike(4030493-'MS1) Source P401116-10 Prepared&Analyzed 03118_]_04 <br /> Tert-antvl methvl ether 269 5 0 ug/I 250 ND 109 78-117 <br /> Benzene 25 2 2 5 " 250 ND 101 81-118 <br /> Tert-butyl alcohol 461, 100 " 500 ND 93 60-147 <br /> Di-isopropvl ether -8 2 5 0 25 0 ND 113 70-125 <br /> 1 2-Dibromoethane(EDB) 25 2 2 5 25 0 ND 101 85-125 <br /> 1 2-Dichloroethane 26 3 2 5 25 0 ND 105 77-126 <br /> Ethanol 430 500 500 ND 86 55-200 <br /> Fthylbenzene 23 6 2 5 25 0 ND 94 89-122 <br /> Ethvl tert-butyl ether 27 4 5 0 25 0 ND 110 71-120 <br /> Methyl tert-butyl ether 17i 2 5 25 0 140 140 70-122 QM04 <br /> Toluene 23 5 2 5 25 0 ND 94 84-119 <br /> Xvten es(total) 700 2 5 75 0 ND 94 86-132 <br /> Sun i ogate Drhi oarofluor oiraethairc h 12 6 00 102 84-123 <br /> Swiogate 12-Drehloroethune-d4 5 76 6 on 96 74-135 <br /> Srniogaie Toltrexe48 h 11 6 00 102 84-119 <br /> Suiiogate 4-Biorrr0/lu0i0heir7eire 6 10 6 00 103 86-119 <br /> l101a AIlalytlCaI-Pelalllma The results rir this report upph to the vuntples atrult=ed rir accordatrce xrtlr the churir <br /> refer ,wdl doccrmeirt Ehlers"thein"" ttulcd results are repolted our a met uvight <br /> haw; Thiv analytic at iel)oi t nn a he iepi oduced in itv entirery <br /> Page 27 of 35 <br />