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DSequoia Morgan8Hill aCAs95037 <br /> - (408)776-9600 <br /> Analytical FAX(408)7826308 <br /> www sequoialabs corn <br /> URS Corporation [Arco]I Project ARCO#5469, Stockton,CA M0I0324 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number GOBZP-0002 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 09/28/05 09 43 <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 (Votes <br /> Batch 5121005- EPA 5030B P/T 1 EPA 8260B <br /> Matrix Spike(5121005-MSI) Source M0I0324-06 Prepared&Analyzed 09/21/05 <br /> tert-Amyl methyl ether 1640 50 ug/1 1500 ND 109 80-115 <br /> Benzene 534 50 516 ND 103 65-115 <br /> tert-Butyl alcohol 15900 2000 14300 440 108 75-120 <br /> Di-isopropyl ether 1600 50 1510 ND 106 75-125 <br /> 1 2-Dtbromoethane(EDB) 1670 50 1480 ND 113 85-120 <br /> 1,2-Dichloroethane 1740 50 1470 ND 118 85-130 <br /> Ethanol 20100 10000 14100 ND 143 70-135 LM <br /> Ethyl tert-butyl ether 1700 50 1500 ND 113 75-130 <br /> Ethylbenzene 751 50 754 ND 100 75-135 <br /> Methyl tert-butyl ether 8520 50 702 7500 145 65-125 BB,LM <br /> Toluene 3740 50 3720 ND 101 85-120 <br /> nes(total) 4220 50 i; 4140 ND 102 85-125 <br /> ne Range Organics(C4-C 12) 58400 5000 44000 5300 121 70-124 <br /> Surrogate 12-Dichloroethane-d4 540 500 108 60-135 <br /> Matrix Spike Dup(5121005-MSD I) Source M0I0324-06 Prepared&Analyzed 09/21/05 <br /> tert-Amyl methyl ether 1650 50 ug/I 1500 ND 110 80-115 06 15 <br /> Benzene 523 50 516 ND 101 65-115 2 20 <br /> tert-Butyl alcohol 16000 2000 14300 440 109 75-120 0 6 25 <br /> Di-isopropyl ether 1590 50 1510 ND 105 75-125 0 6 15 <br /> 1,2-Dibromoethane(EDB) 1580 50 1480 ND 107 85-120 6 15 <br /> 12-Dichloroethane 1680 50 1470 ND 114 85-130 4 20 <br /> Ethanol 18600 10000 14100 ND 132 70-135 8 35 <br /> Ethyl tert-butyl ether 1590 50 1500 ND 106 75-130 7 25 <br /> Ethylbenzene 690 50 754 ND 92 75-135 8 15 <br /> Methyl Cert-butyl ether 7960 50 702 7500 66 65-125 7 20 <br /> Toluene 3390 50 3720 ND 91 85-120 10 20 <br /> Xylenes(total) 3950 50 4140 ND 95 85-125 7 20 <br /> Gasoline Range Organics(C4-C 12) 55200 5000 44000 5300 113 70-124 6 20 <br /> Surrogate 12-Dichloroelhane-d4 504 5 00 101 60-135 <br /> uoia Analytical- Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> 16 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 t 5 of IS <br />