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885 Jarvis Drive <br /> a1Sequoia Morgan Hill CA 95037 <br /> '"''''' (408)776 9644 <br /> 10 Analytical www <br /> scq 8)782 6368 <br /> www seQuoialahs com <br /> 49 <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133, Stockton,CA MPCO263 ' <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Protect Manager Brian Carey 03/31/06 14 03 <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 6C13001 - EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample Dup(6C13001-BSD2) Prepared&Analyzed 03/13/06 <br /> tert-Amyl methyl ether 121 050 ug/l 100 121 80-115 4 15 HL <br /> Benzene 108 050 10 0 108 65-115 5 20 <br /> tert-Butyl alcohol 165 20 200 92 75-150 3 25 <br /> _Chlorobenzene _ _ s 101 - 050 too 104 80-120 3 10 - 3 <br /> Di-isopropyl ether 1 1 4 050 too --114- 75-125 -S y r 15 <br /> 4--1;2-Dibromoethane(EDB) - - 10 4 0 50 _- 100 109 85 120 4 15 <br /> t,2 Dichlorobenzene _ _ __ __T__ _ 10 2 0 50 100 102 80-125 4 10 _ <br />^!"3-Dichlorobenzene 10 2 0 50 10 0 102-_____75_120 5 10 <br /> 1 4-Dichlorobenzene 102 050 too 102 75-120 4 15 <br /> 1 2-Dtchloroethane 10 4 050 100 104 85-130 4 20 <br /> Ethanol 209 300 200 104 70-135 6 35 <br /> Ethyl tert-butyl ether 118 050 100 118 75-130 4 25 . <br /> Ethylbenzene 946 0 50 100 95 75-135 3 15 <br /> Methyl ten butyl ether 11 9 050 100 119 65-125 2 20 <br /> Toluene 10 6 0 50 10 0 106 85-120 6 20 <br /> Xylenes(total) 28 7 050 300 96 85-125 3 20 <br /> Surrogate 1 2-Dtchloroethane-d4 2 73 250 109 60-135 <br /> Surrogate 4-Bromofluoroben_ene 235 <br /> 250 94 70-120 <br /> Surrogate Dibromofluoromelhane 243 2 50 97 65-130 <br /> Suri ogale Toluene-d8 246 250 98 70-120 <br /> Batch 6C16016- EPA 5030B PIT/EPA 8260B <br /> Blank(6C16016-BLK1) Prepared&Analyzed 03/16/06 <br /> Chlorobenzene ND 0 50 ugA <br /> 1 2 Dichlorobenzene ND 0 50 " <br /> I 3-Dichlorobenzene ND 050 " <br /> 1 4 Dichlorobenzene ND 050 <br /> Sui rogale 1 2-Dtchloroethane-d4 5 78 5 00 116 60-135 <br /> Surrogate 4-Bromofluoroben--ene 418 500 84 70-120 <br /> Stu i ogale Dibromofluoromerhane 602 5 00 120 65-130 <br /> Surrogate Toluene-d8 4 85 500 97 70-120 <br /> Sequoia Analytical -Morgan Hill The results in this report apply to the samples analyzed 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 be reproduced to its entirety <br /> Page 16 of 20 <br />