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r• Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> (D— 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)911 9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)791 1865 FAX(707)792-034Z <br /> Oettler-Ayan- Dublin Client Project It) Tosco #6981, Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9011763-764 Report?& Fpb 10, 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 C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD <br /> Batch# 9011395 9011395 9011395 9011395 <br /> Date Prepared 1/29/99 1/29/99 1/29/99 1/29/99 <br /> Date Analyzed 1/29/99 1/29/99 1/29/99 1/29/99 <br /> Instrument i D # HP-2 HP-2 HP-2 HP-2 <br /> Conic Spiked 20pg/L 20pg/t- 26pg/L 60pg/L <br /> Metnx Spike <br /> % Recovery 95 90 90 102 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 95 100 107 <br /> Relative % <br /> Difference 51 54 11 48 <br /> LCS Batch# 2LC8012999 2LCS012999 2LCS012999 2LCS012999 <br /> Date Prepared 1/29/99 1/29/99 1/29/99 1/29/99 <br /> Date Analyzed 1/29/99 1/29/99 1/29/99 1/29/99 <br /> Instrument I D # HP 2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 95 90 90 100 <br /> %Recovery <br /> Control Limits 70-130 70-130 70 130 70-130 <br /> Please Note <br /> The LCS is a control sample of known,interfareatfree mattacthat rs atka.lyzed: sacro seaV_nts, <br /> SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix s*e 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 fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Julianne l=egley <br /> Project Manager <br /> 9011763 GET <3> <br />