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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> Murray &Associates Client Project ID Langston's Market <br /> 5051 Lexington Circle Matrix Soil <br /> Loomis, CA 93650 <br /> Attention Kent Murray QC Sample Goup 3040435-47 Reported Apr 27, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> Ethyl- <br /> ANALYTE <br />' Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br />' Analyst Chiaravalloti Chearavalloti Chtaravallott Chiaravalloti <br /> Concentration <br /> Spiked 020 020 020 060 <br />' LCS Batch# LCSO42293 LCSO42293 L-CSO42293 LCSO42293 <br /> Date Prepared 4/22/93 4/22/93 4/22/93 4/22/93 <br /> Date Analyzed 4/22/93 4/22/93 4/22/93 4/22/93 <br /> Instrument I D # HP 2 HP-2 HP-2 HP-2 <br /> LCS <br /> Recovery 100 ss 100 100 <br /> Control Limits 80-120 80 120 80 120 80 120 <br /> 1 <br />' MS/MSD <br /> Batch # 3040435 3040435 3040435 3040435 <br /> Date Prepared 4/22/93 4/22/93 4/22/93 4/22/93 <br />' Date Analyzed 4/22/93 4/22/93 4/22/93 4/22/93 <br /> Instrument I D # HP 2 HP-2 HP-2 Hp 2 <br />' Matrix Spike <br /> % Recovery 85 85 90 93 <br /> Matrix Spike <br />' Duplicate % <br /> Recovery 85 95 95 95 <br /> Relative % <br /> Difference 00 11 54 21 <br /> SEQUOIA ANALYTICA Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br />' validation of sample batch results Due to matrix effects the QC limits for MS/MSD s are advisory only <br /> Michael R Giles and are not used to accept or reject batch results <br /> Laboratory Director <br /> I3040435 MMM t4> <br />