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r`/-. 8Hi Jarvis Drive <br /> Sequoia Morgan Hill CA 950337 <br /> a�W Analytical FAX(408)7769600 <br /> (408)762-6308 <br /> www sequoialabs com <br /> 5ecor-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 Project 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 /> Blank(6C13001-BLKI) Prepared&Analyzed 03/13/06 <br /> Xylenes(total) ND 050 ug/l <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 12-Drchloroethane-d4 298 250 119 60-135 <br /> Surrogate 4-Bromofluoroben_ene 202 250 81 70-120 <br /> Surrogate Dibromofluoromelhane 269 250 108 65-130 <br /> Surrogate Toluene-d8 229 250 92 70-120 <br /> Laboratory Control Sample(6C13001-BS1) Prepared&Analyzed 03/13/06 <br /> Gasoline Range Organics(C4-C12) 477 50 ugA 440 108 60-140 <br /> Surrogate 1 2-Drchloroethane-d4 283 250 113 60-135 <br /> Surrogate Toluene-d8 243 250 97 70-120 <br /> ogale Dibromofluoromethane 250 250 100 65-130 <br /> gate 4-Bromofluorobencene 233 250 93 70-120 <br /> Laboratory Control Sample(6C13001-BS2) Prepared&Analyzed 03/13/06 <br /> terl-Amyl methyl ether 126 050 ug/l 100 126 80-115 HL <br /> BLnzene 114 050 100 114 65-115 <br /> ten-Butyl alcohol 179 20 200 90 75-150 <br /> Clilorobenzene 107 0 50 100 107 80-120 <br /> Di isopropyl ether 120 050 10 0 120 75-125 <br /> 1 2 Dibromoethane(EDB) 11 3 050 Wo 113 85-120 <br /> 1 2 Dichlorobenzene 106 0 50 100 106 80-125 <br /> 1 3 Dichlorobenzene 107 050 100 107 75-120 <br /> 1 4 Dichlorobenzene 106 050 100 106 75-120 <br /> 1 2 Dichloroethane 108 050 100 108 85-130 <br /> Ethanol 197 300 200 98 70-135 <br /> Ethyl cert-butyl ether 123 050 100 123 75-130 <br /> Ethylbenzene 9 75 050 100 98 75-135 <br /> MLthyl teri-butyl ether 122 050 100 122 65-125 <br /> Toluene 113 050 100 113 85-120 <br /> XylLnes(total) 297 050 300 99 85-125 <br /> Suri ogate 12-Dichloroethane-d4 280 2 50 112 60-135 <br /> Sw i ogare 4-Bromofluorobenzene 237 250 95 70-110 <br /> Surrogate Dibromofluoromethane 250 2 50 100 65-130 <br /> Surrogate Toluene d8 255 250 102 70-120 <br /> �quola 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 in its entirety <br /> Page 15 of 20 <br />