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IF'rDSequoia 1455McDowePtetalum&CA 49544 <br /> (707)792-1865 <br /> �r Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project$P Heritage Site 11191,Stockton,Ca 1`410091 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/15/04 15 22 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporhng Spike Source °/6REC RPD <br /> Anatyte Result limit Units Level Result °/6REC Limits RPD Limit Notes <br /> Batch 4100304-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(4100304-MS1) Source P410091-02 Prepared&Analyzed 10/13/04 <br /> Teri-amyl methyl ether 268 50 ug/l 250 ND 107 78-117 <br /> Benzene 261 25 250 ND 104 81-118 <br /> Tert butyl alcohol 4230 1000 5000 200 81 60-147 <br /> Di-isopropyl ether 255 50 250 ND 102 70-125 <br /> Ethanol 5140 5000 5000 ND 103 55-200 <br /> Ethylbenzene 247 25 250 ND 99 89-122 <br /> Ethyl tert-butyl ether 262 50 250 ND 105 71-120 <br /> Methyl tert-butyl ether 1780 25 250 1500 112 70-122 <br /> Toluene 252 25 250 ND 101 84-119 <br /> Xylenes(total) 764 25 750 ND 102 86-132 <br /> Surrogate Drbromofluoromelhane 551 500 110 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 537 5 00 107 74-135 <br /> *Surrogate Toluene-d8 5 88 5 00 118 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 17 5 00 103 86-119 <br /> Matrix Spike Dup(4100304-MSDI) Source P410091-02 Prepared&Analyzed 10/13/04 <br /> Tert-amyl methyl ether 272 50 ugll 250 ND 109 78-117 1 20 <br /> Benzene 255 25 250 ND 102 81-118 2 20 <br /> Tert-butyl alcohol 4180 1000 5000 200 80 60-147 1 20 <br /> Di-isopropyl ether 252 50 250 ND 101 70-125 1 20 <br /> Ethanol 5640 5000 5000 ND 113 55-200 9 20 <br /> Ethylbenzene 241 25 250 ND 96 89-122 2 20 <br /> Ethyl tent-butyl ether 264 50 250 ND 106 71-120 0 8 20 <br /> Methyl tert-butyl ether 1790 25 250 1500 116 70-122 0 6 20 <br /> Toluene 245 25 250 ND 98 84-119 3 20 <br /> Xylenes(total) 735 25 750 ND 98 86-132 4 20 <br /> Surrogate Dibromofluoromethane 555 " 500 111 84-121 <br /> Surrogate 11-Dichloroethane-d4 5 45 500 109 74-135 <br /> Surrogate Toluene-d8 5 94 500 119 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 23 500 105 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise slated results are reported on a wet weight basis <br /> 0 This analytical report must be reproduced in its entirety <br /> Page 11 of 12 <br />