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."`.rte 8Hi Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> (408)776-9600 <br /> FAX�W Analytical wwseq(408)782-6308 <br /> om <br /> www sequoialabs coni <br /> URS Corporation rArcoII 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 /> Repoitmg Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5C25006-EPA 5030B PIT 1 EPA 8260B <br /> Matrix Spike Dup(5C25006-MSD1) Source 111000460-04 Prepared&Analyzed 03/25/05 <br /> Benzene 1400 25 ug/l 320 1100 94 65-115 7 20 <br /> Ethylbenzene 1100 25 376 630 125 75-135 12 15 <br /> Methyl tert-butyl ether 1030 25 496 720 62 65-125 14 20 LN <br /> Toluene 1620 25 1600 30 99 85-120 0 6 20 <br /> Xylenes(total) 2690 25 1830 560 116 85-125 5 20 <br /> Gasoline Range Organics(C4-C12) 28300 2500 22000 10000 83 70-124 04 20 <br /> Surrogate 12-Dichloroethane-d4 435 500 87 60-135 <br /> Batch 5C28010-EPA 5030B P/T/EPA 82608 <br /> Blank(5C28010-BLK1) Prepared&Analyzed 03/28/05 <br /> 0myl methyl ether ND 050 ug/l <br /> ne ND 050 <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 12-Dichloroethane-d4 4 05 500 81 60-135 <br /> Laboratory Control Sample(5C28010-BS1) Prepared&Analyzed 03/28/05 <br /> tert-Amyl methyl ether 938 050 ug/l 100 94 80-115 <br /> Benzene 8 36 050 100 84 65-115 <br /> tent-Butyl alcohol 593 20 500 119 75-150 <br /> Di-isopropyl ether 920 050 100 92 75-125 <br /> 1,2-Dibromoethane(EDB) 8 93 050 100 89 85-120 <br /> 1,2-Dichloroethane 9 76 050 100 98 85-130 <br /> Ethanol 205 100 200 102 70-135 <br /> Ethyl tert-butyl ether 942 050 100 94 75-130 <br /> Ethylbenzene 9 59 050 100 96 75-135 <br /> Methyl tert-butyl ether 995 050 100 90 65-125 <br /> Am <br /> ❑oia 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 in its entirely <br /> Page 19 of 30 <br />