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ao� laboratories <br /> QUALITY CONTROL DATA <br />' METHOD EPA 8260B <br /> AL Jab No EOfi641 <br />' Instrument HP GC/MS <br /> Matrix Water <br /> Surrogate Standard Recovery Summary <br />' Date Analyzed Client ID Lab ID %Recovery %Recovery Toluene- %Recovery 4- <br /> Dobromofluoromethane d8 Bromofluorobenzene <br />' 06/28/04 Blank BLKE0628 101 102 93 <br /> 06/28/04 TW-Efflu E06641 112 107 111 <br /> 06128/04 TW C-1 E06642 109 105 106 <br /> 1 <br /> 1 <br /> 1 <br />' Matrix Spike Recovery Summary <br />' <br /> Lab ID Client ID AnalPercent Recovery <br /> yte MS / MSD %RPD °/°LC5 <br />' E06442 TW C-1 1,1-Dichloroethene 91 1 82 10 85 <br /> Benzene 92 ! 82 11 82 <br /> Trichloroethene 97 ! 89 9 87 <br /> I Toluene 99 1 89 11 91 <br /> Chlorobenzene 90184 7 86 <br /> Note Daily method blank showed no contamination at or above the reporbng limits <br /> All laboratory quality control parameters were found to be within established limits <br /> I3037 Fifth St , Cores CA 95307 • Phone (209) 581 9280 9 Fox (209) 581 -9282 <br />