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85 Jarvis Drive <br /> 8 <br /> Sequoia Morgan NIL CA 95035037 <br /> (408)776 9600 <br /> FAX 8782-6308Analytical wwwsequoratabs com <br /> • <br /> URS Corporation [Arco 11 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 /> Analyse Result Limit Units Level Result %REC Limits RPD Lrmt Notes <br /> Batch 6C18011 -EPA 5030B P/T/EPA 8260B <br /> Matrix Spike(6C18011-MS1) Source MPC0315-06 Prepared 03/18/06 Analyzed 03/19/06 <br /> tert-Amyl methyl ether 1640 50 ug/I 1630 ND 101 80-115 <br /> Benzene 604 50 504 ND 120 65-115 HL,PE <br /> tert-Butyl alcohol 15500 2000 16900 ND 92 75-120 <br /> Dr-isopropyl ether 1840 50 1620 ND 114 75-125 <br /> 1 2-Dibromoethane(EDS) 1660 50 1660 ND 100 85-120 <br /> 1,2-Dichloroethane 1760 50 1550 ND 114 85-130 <br /> Ethanol 14700 30000 16500 ND 89 70-135 <br /> Ethyl tert-butyl ether 1790 50 1640 ND 109 75-130 <br /> Ethylbenzene 777 50 728 ND 107 75-135 <br /> Methyl tert-butyl ether 5390 50 784 4800 75 65-125 <br /> Toluene 3610 50 3800 ND 95 85-120 <br /> nes(total) 4310 50 4080 ND 106 85-125 <br /> me Range Organics(C4-C12) 49900 5000 44000 3000 107 60-140 <br /> Surrogate 12-Drchloroelhane-d4 513 500 103 60-135 <br /> Surrogate Toluene-d8 519 500 104 70-120 <br /> Surrogate Dibromofluoromethane 492 500 98 65-130 <br /> Surrogate 4-Bromofluoroben_ene 494 Soo 99 70-120 <br /> Matrix Spike Dup(6C18011-MSD1) Source MPC0315-06 Prepared 03/18/06 Analyzed 03/19/06 <br /> tert-Amyl methyl ether 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 /> Di-isopropyl ether 1780 50 1620 ND 110 75-125 3 15 <br /> 1,2-Dibromoethane(EDB) 1640 50 1660 ND 99 85-120 1 15 <br /> 12-Dtchloroethane 1720 50 1550 ND 111 85-130 2 20 <br /> Ethanol 13800 30000 16500 ND 84 70-135 6 35 <br /> Ethyl tent-butyl ether 1750 50 1640 ND 107 75-130 2 25 <br /> Ethylbenzene 737 50 728 ND 101 75-135 5 15 <br /> Methyl 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-C12) 46900 5000 44000 3000 100 60-140 6 25 <br /> Surrogate 12-Dtchloroethane-d4 531 5 00 106 60-135 <br /> Surrogate Toluene-d8 534 5 00 107 70-120 <br /> Surrogate Dibromofluoromethane 5 09 500 102 65-130 <br /> Surrogate 4-Bromofluorobenzene 507 500 101 70-120 <br /> uoia Analytical - Morgan Hill The results to this report apply to the samples analy_ed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must he reproduced in its entirety <br /> Page 22 of 29 <br />