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85 Jin, <br /> Drive <br /> Sequoia SHill)Cis 5037 <br /> Morgan Hill)CA 95637 <br /> (408)7769600 <br /> Analytical WW sq 8) labs82 co 8 <br /> • www scquoialabs cnm <br /> URS Corpoiation[Arcot) Project ARCO#5469,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 6C20002-EPA 5030B PIT 1 EPA 8260B <br /> Matrix Spike(6C20002-MSI) --Source _MPC0315-04 Prepared&Analyzed 03/20/06 <br /> tc.rt Antyl methyl ether v 1630 50 ug/l 1630 13 99 80-115 <br /> Benzene 592 50 504 ND 117 65-115 LM <br /> tert Butyl alcohol 15100 2000 16900 420 87 75-120 <br /> Di isopropyl ether 1700 50 1620 ND 105 75-125 <br /> l 2-Dibromoethane(EDB) 1680 50 1660 ND l01 85-120 <br /> 1,2-Dtchloroethane 1690 50 1550 ND 109 85 130 <br /> Ethanol 13300 30000 16500 ND 81 70 135 <br /> Ethyl tert-butyl ether 1740 50 1640 ND 106 75 130 <br /> Ethylbenzene 775 50 728 ND 106 75 135 <br /> Mohyl tort-butyl ether 6070 50 784 5700 47 65 125 BB LN <br /> "toluene 3540 50 3800 14 93 85-120 <br /> .Xylenes(total) 4360 50 4080 ND 107 85-125 <br /> Gasoline Range Organics(C4-C 12) 47800 5000 44000 3700 100 60-140 <br /> Surrogate 12 Dichloroctharre-d4 497 500 99 60-135 <br /> Surrogate Toluene-dS 5 16 500 103 70-120 <br /> Surrogate Dibromalluoromethane 488 500 98 65-130 <br /> Surrogate 4-Bromofluorobenzene 499 5 00 100 70-120 <br /> Matrix Spike Dap(6020002-MSD1) Source MPC0315-04 Prepared&Analyzed 03/20/06 _ <br /> tort Amyl methyl ether 1610 50 ugll 1630 13 98 80-115 1 15 <br /> Benzene 573 50 504 ND 114 65-115 3 20 <br /> tert Butyl alcohol 15000 2000 16900 420 86 75 120 0 7 25 <br /> Di-isopropyl ether 1650 50 1620 ND 102 75 125 3 15 <br /> 1 2-Dibromoetliane(EDB) 1650 50 1660 ND 99 85-120 2 15 <br /> 12-Dtchloroethane 1640 50 1550 ND 106 85-130 3 20 <br /> Ethanol 13500 30000 16500 ND 82 70-135 1 35 <br /> Cthyl tort butyl ether 1670 50 1640 ND 102 75-130 4 25 <br /> Ethylbenzene 736 50 728 ND 101 75-135 5 15 <br /> Methyl tert-butyl ether 6160 50 784 5700 59 65-125 1 20 BB I N <br /> Toluene 3460 50 3800 14 91 85-120 2 20 <br /> Xylenes(total) 4290 50 4080 ND 105 85-125 2 20 <br /> Gasoline Range Organics(C4 C12) 47800 5000 44000 3700 100 60-140 0 25 <br /> Surrogate 12-Dtchloroethane d4 4 81_ Y 5 00 96 60-135 <br /> Surrogate Toluene d8 5 03 5 00 101 70-120 <br /> Surrogate Dibromofluoromethane 4 79 500 96 65-130 <br /> SurrogalL 4-Bromofluorobenzene 5 12 500 102 70-120 <br /> Sequoia Analytical-Morgan Hill The.results in this report apply to the samples analyzed in ereLordance tvah thL chain of <br /> custody document Unless otherxisc stated results are reported on a wet iveighi basry <br /> This analytical report must be reproduced in its entirety <br /> Page 24 of 29 <br />