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• Sequoia 9600 680 Chesapeake Drive Redwood City,CA 94063 (415} 364- FAX(415) 364-9233 <br /> 1900 8ace5 Avenue Suite L Concord CA 94520 {510} 686-9600 FAX(510)486.9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> I=ugro West, Inc r r " k ClierifProlect ID Shell, 141 N t l l]orado,Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix 'Nater/Air <br /> Roseville, CA 95678 <br /> Attention Sudhakar Talania QC Sample Group 5040530-533 Reported Apr 26, 1995 <br /> v s <br /> QUALITY CONTROL DATA REPORT <br /> AN LYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked. 10 ug/L 1 o ug/L 1 o ug/L 30 ug/L <br /> LCS Batch# LCSO42095 LCSO42095 LCSO42095 LCSO42095 <br /> Date Prepared: 4/20/95 4/20/95 4/20/95 4/20/95 <br /> Date Analyzed. 4/20/95 4/20/95 4/20/95 4/20/95 <br /> .Instrument LD # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery 99 97 97 98 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch#' 5040545 5040545 5040545 5040545 <br /> Date Prepared- 4120/95 4/20/95 4/20/95 4/20/95 <br /> Date Analyzed: 4/20/95 4/20/95 4/20/95 4/20/95 <br /> Instrument I.D.# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 97 93 95 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 98 95 98 97 <br /> Relative% <br /> Difference: 1 0 21 3 1 00 <br /> *SEQUOIA ANALYTICAL Please(vote <br /> The LCS is a control sample of known,interferent free matrix that is anaiyzsd using the same reagents, <br /> d{�� <br /> IT, preparatton and analytical methods employed for the samples The LCS%recovery data Is used for <br /> � �` validation of sample batch results Due to matrix effects, e ry o <br /> the CC limits for M5/MSD's are advisory <br /> My <br /> Linda C SeHnelder Y and are not used to accept or reject batch results <br /> Project Manager <br /> 5040530 FUG <T> <br />