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(D885 Jarvis Dnve <br /> Sequoia Morgan Hill CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782 6308 <br /> www sequotalabs com <br /> • <br /> URS Corporation [Arco I I 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 P/T/EPA 8260B <br /> Matrix Spike(6C20002-MS]) Source MPC0315-04 Prepared&Analyzed 03/20/06 <br /> tert-Amyl methyl ether 1630 50 no 1630 13 99 80-115 <br /> Benzene 592 50 504 ND 117 65-115 LM <br /> cert-Butyl alcohol 15100 2000 16900 420 87 75-120 <br /> Di-isopropyl ether 1700 50 1620 ND 105 75-125 <br /> 1,2-Dibromoethane(EDB) 1680 50 1660 ND 101 85-120 <br /> 1 2-Dichloroethane 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 /> Methyl tert-butyl ether 6070 50 784 5700 47 65-125 BB,LN <br /> Toluene 3540 50 3800 14 93 85-120 <br /> es(total) 4360 50 4080 ND 107 85-125 <br /> me Range Organics(C4-C12) 47800 5000 44000 3700 100 60440 <br /> Surrogate 1 2-Dichloroethane-d4 497 5 00 99 60-135 <br /> Surrogate Toluene-d8 516 500 103 70-120 <br /> Surrogate Dibromofluoromethane 488 500 98 65-130 <br /> Surrogate 4-Bromofluorobenzene 499 500 100 70-120 <br /> Matrix Spike Dup(6C20002-MSD1) Source MPC0315-04 Prepared&Analyzed 03/20/06 <br /> tert-Amyl methyl ether 1610 50 ugA 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 07 25 <br /> Di-isopropyl ether 1650 50 1620 ND 102 75-125 3 15 <br /> 1,2-Dibromoethane(EDB) 1650 50 1660 ND 99 85-120 2 15 <br /> 12-Dichloroethane 1640 50 1550 ND 106 85-130 3 20 <br /> Ethanol 13500 30000 16500 ND 82 70-135 1 35 <br /> Ethyl tert-butyl ether I670 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 LN <br /> Toluene 3460 50 3800 14 91 85-120 2 20 <br /> Xylenes(total) 4290 50 4080 ND 105 85-125 2 20 <br /> Gasolme Range Organ ics(C4-C 12) 47800 5000 44000 3700 100 60-140 0 25 <br /> Surrogate 1 2-Dichloroethane-d4 481 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 /> Surrogate 4-Bromofluoroben::ene 5 12 .500 102 70-120 <br /> uoia Analytical-Morgan Hill The results in this report apply to the samples analyced in accordance with the chain of <br /> custody document Unless othenvise stated results are reported on a wel weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 24 of 29 <br />