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885 Jarvis Drive <br /> Sequoia Morgan Hill C95037 <br /> `1 (408)777 6-9b00 <br /> FAX(408)782 6308 <br /> Analytical www sequoialabs coin <br /> URS Corporation [Arco I I Project ARCO#6100,Tracey,CA M0I0662 <br /> Pro <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number GOC IY-0005 Reported.3 <br /> Sacramento CA,95833 Project Manager Jay Johnson 10/03/05 17 30 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5JO1004-EPA 5030B PIT/EPA 8260B <br /> Matrix Spike(5JO1004-MSI) Source M010808-01REI Prepared 10/01/05 Analyzed 10/02/05 <br /> tent-Amyl methyl ether 101 50 ugA 100 3 1 98 80-115 <br /> Benzene 115 5 0 100 1 8 113 65-115 <br /> tert-Butyl alcohol 534 200 500 ND 107 75-120 <br /> Di-isopropyl ether 104 5 0 100 ND 104 75-125 <br /> 1,2-Dibromoethane(EDB) too 5 0 100 ND 100 85-120 <br /> 1 2-Dichloroethane 114 5 0 100 ND 114 85-130 <br /> Ethanol 2350 1000 2000 ND 118 70-135 <br /> Ethyl tert-butyl ether 950 50 100 ND 95 75-130 <br /> Ethylbenzene 111 50 100 ND 111 75-135 <br /> Methyl tert-butyl ether 95 5 50 100 2 6 93 65-125 <br /> Toluene 106 5 0 too ND 106 85-120 <br /> Yditmes(total) 363 5 0 300 ND 121 85-125 <br /> gate 12-Drchloroethane-d4 2 55 250 102 60-135 <br /> Matrix Spike Dup(5J01004-MSDI) Source M010808-01RE1 Prepared 10/01/05 Analyzed 10/02/05 <br /> tert-Amyl methyl ether 101 50 ugA too 3 1 98 80-115 0 15 <br /> Benzene 121 50 loo 1 8 119 65-115 5 20 LM <br /> tert-Butyl alcohol 508 200 500 ND 102 75-120 5 25 <br /> Di-Isopropyl ether 106 5 0 100 ND 106 75-125 2 15 <br /> 1 2-Dibromoethane(EDB) 101 50 100 ND 101 85-120 1 15 <br /> 1 2-Dichloroethane 115 5 0 100 ND 115 85-130 0 9 20 <br /> Ethanol 2360 1000 2000 ND 118 70-135 04 35 <br /> Ethyl tert-butyl ether 978 5 0 100 ND 98 75-130 3 25 <br /> Ethylbenzene 119 50 100 ND 119 75-135 7 15 <br /> Methyl tert-butyl ether 98 3 50 100 26 96 65-125 3 20 <br /> Toluene 114 50 100 ND 114 85-120 7 20 <br /> Xylenes(total) 385 50 300 ND 128 85-125 6 20 LM <br /> Surrogate 12-Dichloroethane-d4 257 250 103 60-135 <br /> �uo1a Analytical-Morgan Hill The results in this report apply to the samples analysed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a ivet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 16 <br />