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q 8Hi I,CA 5037 <br /> Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776 9600 <br /> Analytical FAX equoi 782 6308 <br /> www sequotalahs coni <br /> 0 <br /> URS Corporation(Arco I I Project ARCO#5469,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 Lunit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5C28010-EPA 5030B P/T/EPA 8260B <br /> Laboratory Control Sample(5C28010-BSI) Prepared&Analyzed 03/28/05 <br /> Toluene 856 050 ug/l 100 86 85-120 <br /> Xylenes(total) 309 050 300 103 85-125 <br /> Surrogate 12-Dichloroethane-d4 499 500 104 60-135 <br /> Laboratory Control Sample(5C28010-BS2) Prepared&Analyzed 03/28/05 <br /> Benzene 558 050 ug/l 640 87 65-115 <br /> Ethylbenzene 7 84 0 50 752 104 75-135 <br /> Methyl tert-butyl ether 100 0 50 992 101 65-125 <br /> Toluene 325 0 50 319 102 85-120 <br /> Xylenes(total) 397 0 50 366 108 85-125 <br /> Gasoline Range Organics(C4-C12) 406 50 440 92 70-124 <br /> 09-te 1 2-Dichloroethane-d4 5 43 500 109 60-135 <br /> Laboratory Control Sample Dup(5C28010-BSDI) Prepared&Analyzed 03/28/05 <br /> tent-Amyl methyl ether 97-1 050 ug/l 100 97 80-115 4 15 <br /> Benzene 8 37 050 100 84 65-115 0 1 20 <br /> tert-Butyl alcohol 594 20 500 119 75-150 02 25 <br /> Di-isopropyl ether 936 050 100 94 75-125 2 15 <br /> 1,2-Dibromoethane(EDB) 950 050 100 95 85-120 6 15 <br /> 1,2-Dichloroethane 105 050 100 105 85-130 7 20 <br /> Ethanol 205 100 200 102 70-135 0 35 Ic <br /> Ethyl tert-butyl ether 980 050 100 98 75-130 4 25 <br /> Ethylbenzene 945 050 100 94 75-135 1 15 <br /> Methyl tert-butyl ether 941 050 100 94 65-125 5 20 <br /> Toluene 867 050 100 87 85-120 1 20 <br /> Xylenes(total) 30 1 050 300 100 85-125 3 20 <br /> Surrogate 1 2-Dtchloroethane-d4 512 500 102 60-135 <br /> nota Analytical-Morgan Hill The results in this report apply to the samples analyzed to 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 entirety <br /> Page 20 of 30 <br />