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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N 4viget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> �6W 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 /> tettler-Ryan -Dublin Client Project ID Tosco 76#11193, Stockton <br /> 6747 Sierra Court, Suite J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Haig Kevork QC Sample Group 8120955-959 Reported Dec 15, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Lead <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb J Kelly <br /> MS/MSD <br /> Batch# 8124646 8120646 8120646 8120646 8120771 <br /> Date Prepared 12/9/98 12/9/98 12/9/98 12/9/98 12/11/98 <br /> Date Analyzed 12/9/98 12/9/98 12/9/98 12/9/98 12/14/98 <br /> Instrument I D # HP-4 HP-4 HP 4 HP-4 MV-3 <br /> Conc Spiked 0 80 mg/kg 0 80 mg/kg 0 80 mg/kg 2 4 mg/kg 50 mg/kg <br /> Matrix Splice <br /> % Recovery 103 89 90 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 99 85 88 100 <br /> Relative % <br /> Difference 37 43 2 8 00 98 <br /> LCS Batch# 4LCS121198 4LCS121198 4LCS121198 4LCS121198 LCS121198 <br /> Date Prepared 12/11/98 12/11/98 12/11/98 12/11/98 12/11/98 <br /> Date Analyzed 12/11/98 12/11/98 12/11/98 12/11/98 12/14/98 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 MV-3 <br /> LCS % <br /> Recovery 99 84 88 96 106 <br /> ° ecovery <br /> Control Limits 50-150 50-150 50-150 50-150 80-120 <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 /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> i� 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 *Value undeterminable due to matrix interference and/or concentration in sample <br /> 8120955 GET <3> <br />