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Drive <br /> SeC 8Hi Jarvis <br /> quoia MorganHdl,CA950375037 <br /> 4D— (408)776-9600 <br /> Analytical FAX(408)7926308 <br /> www sequoialabs corn <br /> URS Corporation[Arcola Project ARCO 45469,Stockton,CA M000479 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 04/07/05 12 53 <br /> Volatile organic Compounds by 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 5C30005-EPA 5030B P/T/EPA 8260B <br /> Laboratory Control Sample(5C30005-BS1) Prepared&Analyzed 03/30/05 <br /> ter(-Amyl methyl ether 105 050 ug/l too 105 80-115 <br /> Benzene 938 050 100 94 65-115 <br /> tert-Butyl alcohol 479 20 500 96 75-150 <br /> Di-isopropyl ether 109 050 10 0 109 75-125 <br /> 1,2-Dtbromoethane(EDB) 9 16 050 10 0 92 85-120 <br /> 1,2-Dechloroethane 11 5 050 10 0 115 85-130 <br /> Ethanol 157 100 200 78 70-135 <br /> Ethyl tert-butyl ether 109 0 50 10 0 109 75-130 <br /> Ethylbenzene 10 2 0 50 10 0 102 75-135 <br /> Methyl tert-butyl ether I l 0 0 50 10 0 110 65-125 <br /> itene 9 18 0 50 10 0 92 85-120 <br /> es(total) 303 050 300 101 85-125 <br /> Surrogate 12-Dechloroethane-d4 S 47 500 109 60-135 <br /> Laboratory Control Sample(5C30005-BS2) Prepared&Analyzed 03/30/05 <br /> Benzene 5 23 050 ug/l 640 82 65-115 <br /> Ethylbenzene 804 050 7 52 107 75-135 <br /> Methyl tert-butyl ether 8 11 0 50 992 82 65-125 <br /> Toluene 31 1 0 50 31 9 97 85-120 <br /> Xylenes(total) 43 2 0 50 366 118 85-125 <br /> Gasoline Range Organics(C4-C12) 386 50 440 88 70-124 <br /> Surrogate 12-Dechloroethane-d4 444 500 89 60-135 <br /> Laboratory Control Sample Dup(5C30005-BSDI) Prepared&Analyzed 03/30/05 <br /> tert-Amyl methyl ether 10 l 050 ug/l 100 101 80-115 4 15 <br /> Benzene 100 050 to 0 100 65-115 6 20 <br /> tert-Butyl alcohol 476 20 500 95 75-150 0 6 25 <br /> De-isopropyl ether 108 050 100 l08 75-125 0 9 15 <br /> 1,2-Dtbromoethane(EDB) 931 0 50 10 0 93 85-120 2 15 <br /> 1,2-Dechloroethane 104 0 50 10 0 104 85-130 10 20 <br /> Ethanol 175 100 200 88 70-135 11 35 <br /> Ethyl tert-butyl ether 109 050 to 0 109 75-130 0 25 <br /> Ethylbenzene 100 0 50 100 100 75-135 2 is <br /> Methyl tent-butyl ether 11 0 0 50 10 0 110 65-125 0 20 <br /> Toluene 946 0 50 100 95 85-120 3 20 <br /> Xylenes(total) 322 0 50 300 107 85-125 6 20 <br /> uota Analytical-Morgan Hill The results in this report apply to the samples analyzed in 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 to its entirety <br /> Page 24 of 30 <br />