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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921 0100 <br /> Aegis Environmental Consultants Client Project 1D Shell 141 N El Dorado,Stockton CA <br /> 050 Melody Lane, Ste 160 Matrix Water <br /> oseville, CA 95678 Reported Dec 29, 1993 <br /> Attention Paul Graff OC Sample Group 312-0732 p <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xvlenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS1M93 LCS122393 LCS122393 LCS122393 <br /> Date Prepared 12/23/93 12/23/93 12/23/93 12/23/93 <br /> Date Analyzed 12/23/93 12/23/93 12/23/93 12/23/93 <br /> Instrument I D # HP1 HP1 HP1 HP1 <br /> LCS % <br /> . Recovery 100 105 105 103 <br /> Control Limits 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch # 3120841 3120841 3120841 3120841 <br /> Date Prepared 12/23/93 12/23/93 12/23/93 12/23/93 <br /> Date Analyzed. 12/23/93 12/23/93 12/23/93 12/23/93 <br /> Instrument I D W riP1 HPI HPI HP1 <br /> Matrix Spike <br /> % Recovery 99 100 100 100 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 100 110 110 1D3 <br /> Relative % <br /> Difference 10 95 95 30 <br /> SEQUOIA ANALYTICAL 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 sampies 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 /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 3120732 AEG <2> <br />