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Sequoia 404 N Wlget Lane <br /> Walnut Creek,CA 94598 <br /> Analytical `925'988-9600 FAX(925)988-967373 <br /> Gettler-Ryan- Dublin Y Client Project ID Tosco SS#6981, Stockton • <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9071230,-243 Reported _ Aug 4, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: D Newcomb D Newcomb ❑ Newcomb D Newcomb <br /> MS/MSD <br /> Batch#' 9071168 9071168 9071168 9071168 <br /> Date Prepared 7/23/99 7/23/99 7/23/99 7/23/99 <br /> Date Analyzed 7/23/99 7/23/99 7/23/99 7/23/99 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20pg/L 20ug/L 20ug/L 60ug/L <br /> Matrix Spike <br /> % Recovery 105 95 110 108 <br /> Matrix Spike l� <br /> Duplicate% <br /> Recovery 110 95 105 110 <br /> Relative% <br /> Difference 47 0 0 4 7 is <br /> LCS Batch# 41-CS072399 4LCS072399 4LCS072399 4LCS072399 <br /> Date Prepared 7/23/99 7/23/99 7/23/99 7/23/99 <br /> Date Analyzed 7/23/99 7/23/99 7/23/99 7/23/99 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 110 95 95 110 <br /> ecovery <br /> Control Limits 70-130 70-130 70-130 70 130 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL,#1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortifled with known quantities of specific compounds and subjected to the entire analytical procedure It <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Julianne Fegley <br /> Project Manager <br /> 9071230 GET <17> <br /> S�fu <br />