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1455 Nic.Dowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> Ay � (707)792-186 <br /> lia <br /> FAX(707)792-0142 <br /> www sequoialabs com <br /> URS Corp-Sacranaento Project Arco Site 5469 Stockton,CA P403099 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number 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 '/,,RFC RPD <br /> 1An-iIvte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4030493-EPA 50308 waters <br /> Matrix Spike Da (4030493-MSDi) Source P403116-10 Prepared&Analyzed 03/18/04 <br /> Tert-amyl wethvl ether 2tr 4 5 0 ug/1 250 ND 106 7S-117 2 20 <br /> Benzene 24 5 2 5 " 250 ND 98 81-118 3 20 <br /> Tert-butyl alcohol 556 100 500 ND 111 60-147 18 20 <br /> DL-isopropyl ether 273 5 0 250 ND 109 70-125 3 20 <br /> 1 2-Dibronaoethanc(EDB) 255 25 250 ND 102 85-125 1 20 <br /> 1 2-Dichloroethane 258 2 5 250 ND 103 77-126 2 20 <br /> Ethanol 598 500 500 ND 120 55-200 33 20 QC20 <br /> Fthylbenzene 23 1 25 250 ND 92 b9-122 2 20 <br /> Ethyl tert-butyl ether 206 5 0 250 ND 106 71-120 3 20 <br /> Methvl tert-butyl ether 171 2 5 250 140 124 70-122 2 20 QM04 <br /> Toluene 228 2 5 250 ND 91 84-119 3 20 <br /> "nes(total) 709 2 5 750 ND 95 86-132 0 4 20 <br /> i nQute Dihi oniolluoi once thane 5 94 6 00 ''–—_— 99 84-122 <br /> SmiogarP 1 2-Dichloioeihune-rad 583 h 00 97 74-135 <br /> Siniogate Toluene-dS 6 06 6 00 101 84-119 <br /> Sul iogute d-BIonioJluoi 0b n_ene 612 6 00 102 86-119 <br /> �uotaAnalytica3-Petaluma The results in this iep0it apple to the swmples unullzed in accoidune a Kith the churn <br /> 0f custodt docrvmnr Unless otheissice stated iesuhs ate+eporded on a Het Height <br /> basis Tarts anuhtic al repoiI nirisr be;eptoduced in rte entiret) <br /> Page 28 oF35 <br />