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Sequoia 6130 Chesapeake Drive Redwood Cary CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Ottler-Ayah-Dublin Client Project 10 Tosco (Uno6al}"98#6981, Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding OC Sample Group 9011966-973 Reported Feb 18, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst D Newcomb D Newcomb D Newcomb 0 Newcomb N Nelson <br /> MS/MSD <br /> Batch# 9020016 9020016 9020016 9020016 9020015 <br /> Date Prepared 2/4/99 2/4/99 2/4/99 2/4/99 2/3/99 <br /> Date Analyzed 2/4/99 2/4/99 2/4/99 2/4/99 2/3/99 <br /> Instrument I D # HP-2 HP 2 HP-2 HP 2 GC/MS 2 <br /> Conc Spiked 20 fig/L 20lig/L 20ug/L 60,ug/L 50pg/L <br /> Matrix Spike <br /> .% Recovery 100 95 100 108 110 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 90 90 107 106 <br /> Relative % <br /> Difference 51 54 11 16 37 <br /> LCS Batch# 2LCS020499 2LCS020499 2LC8020499 2LCS020499 LCS020299 <br /> Date Prepared 2/4/99 2/4/99 2/4/99 2/4/99 2/2/99 <br /> Date Analyzed 2/4/99 2/4/99 2/4/99 2/4/99 2/2/99 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 GC/MS-2 <br /> LCS % <br /> Recovery 100 95 105 110 100 <br /> Recovery <br /> Control Limits 70-130 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 /> UOIA ANALYTICAL, #1271 preparation,and anaiytical methods employed for the samples The matrix spike is an aliquot of sample <br /> * fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <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 /> ullanne Fegley <br /> Project Manager <br /> 9011960 GET <17> <br />