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885 Jarvis Drive, <br /> Sequoia Morgan Hill GA 95037 <br /> (408)776 96[)0 <br /> Analytical I ( 782 6308 <br /> wwww s�quoquuialahs wm <br /> URS Corporation[Arco I I Project ARCO 95469 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 6C18011 -EPA 5030B P/T I EPA 8260B <br /> Matrix Spike(6C18011-MSI) - Source MPCO315-06 - Prepared 03/18/06 Analyzed 03/19/06 <br /> tert-Amyl methyl ether 1640 50 ug/l 1630 ND 101 80 115 <br /> Benzene 604 50 504 ND 120 65 115 HL,PE. <br /> tort-Butyl alcohol 15500 2000 16900 ND 92 75 120 <br /> Di-isopropyl ether 1840 50 1620 ND 114 75-125 <br /> 1 2-DtbromoethaflL(EDB) 1660 50 1660 ND 100 85-120 <br /> 1,2-Dichloroethane 1760 50 3550 ND 114 85-130 <br /> Ethanol 14700 30000 16500 ND 89 70-135 <br /> Ethyl tert butyl ether 1790 50 1640 ND t09 75-130 <br /> Ethylbenzene 777 50 728 ND 307 75-135 <br /> Methyl tert-butyl ether 5390 50 784 4800 75 65-125 <br /> Toluene 3610 50 3800 ND 95 85-120 <br /> .Xylenes(total) 4310 50 f1 4080— ND 106 85-125 <br /> GasoIme Rang(Org�imcs(C4-C 12) 49900 5000 44000 3000 107 60-140 <br /> Surrogate 1 2-Diehloroethanc d4 5 13 500 103 60-135 <br /> Surrogate Toluene-d8 5 19 500 104 70-120 <br /> Surrogate Dibromofluoronrcthone 4 92 500 98 6S 130 <br /> Surrogate 4-Bromofluorobenzene 4 94 500 99 70-120 <br /> Matrix Spike Dap(608011-MSD1) Source MPC0315-06 Prepared 03/18/06 Analyzed 03/19/06 <br /> tert-Amyl methyl(.cher 1580 50 ug/l 1630 ND 97 80 115 4 15 <br /> Benzene 582 50 504 ND 115 65 115 4 20 PE <br /> tert-Butyl alcohol 15500 2000 16900 ND 92 75-120 0 25 <br /> Diisopropyl(ther 1780 50 1620 ND 110 75-125 3 15 <br /> 1 2-Dibromoetbane(EDB) 1640 50 1660 ND 99 85-120 1 15 <br /> 1 2-Dit hloroethane 1720 50 1550 ND Ill 85-130 2 20 <br /> Ethanol 13800 30000 16500 ND 84 70-135 6 35 <br /> Ethyl t(rt butyl ether 1750 50 1640 ND 107 75-130 2 25 <br /> Ethylbenzene 737 50 728 ND 101 75-135 5 15 <br /> Wthyl tert-butyl ether 5350 50 784 4800 70 65-125 0 7 20 <br /> Toluene 3490 50 3800 ND 92 85-120 3 20 <br /> Xylenes(total) 4150 50 4080 ND 102 85 125 4 20 <br /> Gasoline Range Organics(C4 CI 2) 46900 5000 44000 3000 100 60 140 6 25 <br /> Surrogate 1 2-Dichloroethane-d4 _ 5 31 5 00 106 60 135 <br /> Surrogate Tolucnc d8 534 500 107 70-120 <br /> Surrogate Dibronrofluorome.thane 5 09 5 00 102 65-130 <br /> Surrogate 4-8romofluorobenzcnc. 507 5 00 101 70-120 <br /> Sequoia Analytical- Morgan }-Fill The results in this report apply to the samples analyzed in accordant(,with the chain of <br /> custody document Unless othentisc stated m5ults are reported on a wet height basis <br /> This analytical report must be reproduced in its enitrety <br /> Page 22 of 29 <br />