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4 <br /> � Sequoia 680 Chesapeake Drive Redwood City 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 /> Settler-Ryan - Dublin Client Project ID Tosco#11193, Stockton <br /> 6747 Sierra Court, Suite J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Doug Lee QC Sample Group 8121856-864 Reported Dec 31, 1998 <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 D Newcomb N Nelson <br /> MS/MSD <br /> Batch# 8121861 8121861 8121861 8121861 8121856 <br /> Date Prepared 12/23/98 12/23/98 12/23/98 12/23/98 12/23/98 <br /> Date Analyzed 12/233/96 12/23/98 12/23/98 12/23/98 12/30/98 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 GC/MS-2 <br /> Conic Spiked 0 80 mg/kg 0 80 mg/kg 0 80 mg/kg 2 4 mg/kg 2500ug/kg <br /> Matrix Spike <br /> % Recovery 105 91 94 104 109 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 101 88 91 100 121 <br /> Relative % <br /> Difference 36 42 27 4 1 98 <br /> LCS Batch# 4LCS122398 4LCS12-2398 41-CS122398 4LCS122398 LCS122398 <br /> Date Prepared 12/23/98 12/23/98 12/23/98 12/23/98 12/23/98 <br /> Date Analyzed 12/23/98 12/23/98 12/23/98 12/23/98 12/28/98 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 GC/MS-2 <br /> LCS % <br /> Recovery 90 78 80 92 124 <br /> Recovery <br /> Control Limits 50-150 50-150 50-150 50-150 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 /> 1111! 2 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 recoveryis to be used to validate the batch <br /> lianne Fegley <br /> Project Manager <br /> 8121856 GET <12> <br />