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885 Jarvis Drive <br /> Morgan Hen CA 95037 <br /> SegllQla (A08)77696r0 9600 <br /> a- -) FAXAnalytical wwSeqa2-cora <br /> www equoiaialabs cam <br /> URS Corporation (Arc011 Project ARCO#6100,Tracey,CA MOI0662 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number GOCIY-0005 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 10/03/05 17 30 <br /> Volatile Organic Compounds 5y EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5130006- EPA 5030B P/T/EPA 8260B <br /> Matrix Spike(5I30006-MSI) Source M010662-04 Prepared&Analyzed 09/30/05 <br /> ten-Amyl methyl ether 193 50 ug/l 150 45 126 80-115 LM <br /> Benzene 111 50 516 47 124 65-115 LM <br /> tert-Butyl alcohol 2090 200 1430 200 132 75-120 LM <br /> Di-isopropyl ether 192 50 151 ND 127 75-125 LM <br /> 1,2-Dtbromoethane(EBB) 226 50 148 5 1 149 85-120 LM <br /> 12-Dichloroethane 229 50 147 59 116 85-130 <br /> Ethanol 1740 1000 1410 ND 123 70-135 <br /> Ethyl tert-butyl ether 174 50 150 ND 116 75-130 <br /> Ethylbenzene 899 50 754 27 116 75-135 <br /> Methyl tert-butyl ether 850 50 702 39 116 65-125 <br /> Toluene 668 50 372 270 107 85-120 <br /> 0 (total) 986 50 414 550 105 85-125 <br /> :.Range Organics(C4-C12) 8150 500 4400 2200 135 70-124 LM <br /> Surrogate 12-Dichloroethane-d4 427 500 85 60-135 <br /> Matrix Spike Dup(5130006-MSDI) Source M010662-04 Prepared&Analyzed 09/30/05 <br /> tert-Amyl methyl ether 190 so ug/l 150 45 124 80-115 2 15 LM <br /> Benzene 106 5 0 516 47 114 65-115 5 20 <br /> tert-Butyl alcohol 2210 200 1430 200 141 75-120 6 25 LM <br /> Di-isopropyl ether 178 5 0 151 ND Hs 75-125 8 15 <br /> 1,2-Dibromoethane(EDB) 216 5 0 148 5 1 142 85-120 5 15 LM <br /> 1 2-Dichloroethane 218 5 0 147 59 108 85-130 5 20 <br /> Ethanol 1880 1000 1410 ND 133 70-135 8 35 <br /> Ethyl tert-butyl ether 172 5 0 150 ND 115 75-130 1 25 <br /> Ethylbenzene 923 5 0 75 4 2 7 119 75-135 3 15 <br /> Methyl tert-butyl ether 809 5 0 702 3 9 110 65-125 5 20 <br /> Toluene 652 5 0 372 270 103 85-120 2 20 <br /> Xylenes(total) 986 5 0 414 550 105 85-125 0 20 <br /> GasoIme Range Organics(C4-C12) 7560 500 4400 2200 122 70-124 8 20 <br /> Surrogate 12-Dichloroethane-d4 405 500 81 60-135 <br /> quota Analytical- Morgan Hill The results in this report apply to the samples analy_ed in accordance with the chain of <br /> custody document Unless otherwise staled results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 12 of 16 <br />