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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 5tr,ker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)79Z-1865 FAX(707)792-0342 <br /> Oler-Plyan - Dublin Client Protect ID Tosco #11193, Stockton <br /> 6747 Sierra Court, Suite J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Doug Lee OC Sample Group 812-1865 Reported Dec 28, 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# 8121861 8121861 8121861 8121861 8121802 <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 MV-4 <br /> Cone Spiked 0 80 mg/kg 0 80 mg/kg 0 80 mg/kg 2 4 mg/kg 50 mg/kg <br /> Matrix Spike <br /> % Recovery 105 91 94 104 80 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 101 88 91 100 83 <br /> Relative % <br /> Difference 36 42 27 41 <br /> LCS Batch# 4LCS122398 4LCS122398 4LCS122398 4LCS122398 LCS 122398 <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 MV-4 <br /> LCS % <br /> Recovery 90 78 80 92 98 <br /> Recovery <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 /> (/h✓�� 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 /> 11'ia�n'ne Fegfey <br /> Project Manager <br /> 8121865 GET <3> <br />