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f� <br /> 1455 McDowell Blvd,North Ste D <br /> a— ) (707)Sequoia Petaluma,CA 94954 <br /> 1865 <br /> Analytical 792- <br /> FAX(70'.7)792-0342342 <br /> www.uquoralabs_wtn <br /> URS Corp-Sacramento Project. Arco Site 2168,Stockton,CA P305581 <br /> 2870 Gateway Oaks Drive Suite 300 PrvjectNumber WR36590 Reported, <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/13/03 09 42 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporung Spike Source °/*REC RPD <br /> Analyte Result LMW Units level Result VaREC Limits RPD Linut Notes <br /> Batch 3060221-EPA 5030 waters <br /> Matnz Spike Dup(3060221 MSD1) Source P306035-02 Prepared&Analyzed 06/10/03 <br /> Tart-amyl methyl ether 244 50 119/1 250 ND 98 70-116 1 20 <br /> Tert-butyl alcohol 494 100 500 33 92 62-142 2 20 <br /> Di-isopropyl ether 231 50 250 ND 92 71-121 04 20 <br /> 1,24)ibromoethane(EDB) 266 25 250 ND 106 92-117 2 20 <br /> 1,2-Dichlonoethane 242 25 250 ND 97 79-126 2 20 <br /> Ethyl tert-butyl ether 228 so 250 ND 91 71-110 04 20 <br /> Methyl tert-butyl ether 239 25 250 ND 96 77-123 2 20 <br /> Surrogate Dibromolluoromethane 504 " 500 101 84-122 <br /> Surrogate 12-Drohloroethane-d4 471 500 94 74-135 <br /> Surrogate Toluene-d8 503 500 101 84-119 <br /> quota Analytical-Petaluma The results in this report apply to the samples analyzed m accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 12 of 13 <br />