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• <br />• <br />• <br />AL Job No: E07691 <br />Instrument: HP GC/MS <br />Matrix: Water <br />a O @R laboratories <br />QUALITY CONTROL DATA <br />METHOD: EPA 8260B <br />Surrogate Standard Recovery Summary <br />Date Analyzed <br />Client ID <br />Lab ID <br />Recovery <br />% Recovery Toluene <br />% Recovery 4- <br />07/29/04 <br />SB1-30 GW <br />E07691 <br />Dibromofluoromethane <br />d8 <br />Bromofluorobenzene <br />U/cZIIUw <br />aianK <br />bLntuiza <br />11b <br />1p7 <br />87 <br />07/29/04 <br />SB1-30 GW <br />E07691 <br />123 <br />110 <br />94 <br />07/29/04 <br />SB2-40 GW <br />E07692 <br />115 <br />114 <br />91 <br />07/29/04 <br />SB3- 25 GW <br />E07693 <br />114 <br />111 <br />95 <br />07/29/04 <br />SB4-30 GW <br />E07694 <br />113 <br />114 <br />98 <br />07/29/04 <br />S135-28 GW <br />E07695 <br />124 <br />113 <br />101 <br />Matrix Spike Recovery Summary <br />Lab ID Client ID Analyte <br />Percent Recovery <br />MS / MSD <br />%RPD <br />%LCS <br />E07695 SB5-28 GW 1,1-Dichloroethene <br />108 / 103 <br />5 <br />111 <br />Benzene <br />96 / 96 <br />0 <br />106 <br />Trichloroethene <br />90 / 89 <br />1 <br />100 <br />Toluene <br />93 / 81 <br />2 <br />105 <br />Chlorobenzene <br />80 / 78 <br />2 <br />89 <br />Note: Daily method blank showed no contamination at or above the reporting limits. <br />All laboratory quality control parameters were found to be within established limits. <br />3037 Fifth SL., Ceres, CA 95307 • Phone (209) 581-9280 9 Fox (209) 581-9282 <br />