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�1 <br /> Sequoia 885 Jarvis Dore <br /> eMorgan <br /> Htll CA 95437 <br /> (408)776 9600 <br /> Analytical <br /> FAX lubsLo92 8 <br /> Analytical www sc,quoislabs Wm <br /> URS Corporation[Arc of I Project ARCO 45469,Stockton,CA MPC0315 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOBZP-0010 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/30/06 14 47 <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 6C18001 -EPA 5030E PIT/EPA 8260B <br /> Blank(6C18001-BLK1) Prepared&Analyzed 03/18/06 <br /> tix-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 5 0 <br /> Di-isopropyl ether ND 050 " <br /> I 2-Dibromoethane(EDB) ND 050 <br /> i 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 /> �Xylencs(total) ND 050 —' <br /> GasoUnc Range Organics(C4 C12) ND 50 <br /> Surrogate 12-Dichloroethane-d4 493 500 99 60-135 <br /> Surrogate Toluene d8 543 500 109 70-120 <br /> Surrogate Dibromofluoromerhanc 529 500 106 65-130 <br /> Surrogate 4-8ronrofluorobcnzenc 48S 500 97 70-120 <br /> Laboratory Control Sample(608001-BSI) Prepared&Analyzed 03/18/06 _ - T <br /> tert-Amyl methyl ether 16 1 050 ug/l 163 99 80-115 <br /> Benzene 577 050 5 04 H4 65-115 <br /> tert-Butyl 4leohol 163 5 0 169 96 75-150 <br /> Di-isopropyl ether 170 050 162 105 75-125 <br /> 1,2-Dibromoethane(EDB) 163 050 166 98 85-120 <br /> 1 2 Dichloroethane 165 0 50 15 5 106 85-130 <br /> Ethanol 144 100 165 87 70-135 <br /> Ethyl tent butyl ether 170 0 50 16 4 104 75 130 <br /> Ethylbenzene 8 05 050 728 Hl.1 75-135 <br /> Methyl tert-butyl ether 8 38 0 50 7 84 107 65 125 <br /> Toluene 36 1 050 380 95 85 120 <br /> Xylenes(total) 43 8 050 408 107 85 125 <br /> Gasoline Range Organics(C4 C12) 447 50 440 102 60-140 <br /> Surrogate 12 Dichloroethane-d44 5 02 5 00 100 60-135 <br /> Surrogate Toluene-d8 546 5 00 109 70-120 <br /> Surrogate Dibromofluoromethane 507 500 101 65-130 <br /> Surrogate 4 Bromofluorobenzenc 523 5 00 105 70-120 <br /> Sequoia Analytical -Morgan Hill Tire results in thus report apply to the samples analyzed in accordance with the chain of <br /> Custody document Unlesy ot&rwtsc stated results are reported on a wct weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 19 of 29 <br />