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n <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 /> { <br /> ettleie-1 yan= 0ublin ' Client IProject ID Unocal Circle K 88#1205, Lathrop <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9011723-727 Reported Feb 9, 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# 9011481 9011481 9011461 9011481 <br /> Date Prepared 2/2/99 2/2/99 2/2/99 2/2/99 <br /> Date Analyzed 2/2/99 2/2/99 2/2/99 2/2/99 <br /> Instrument I D # HP-9 HP-9 HP-9 HP 9 <br /> Conc Spiked 20 Ng/L 20 pg/L 20 jug/L 60 jig/L <br /> Matrix Spike <br /> .% Recovery 105 105 105 105 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 100 100 103 <br /> Relative % <br /> Difference 49 49 49 1 6 <br /> LCS Batch# 9LCS020299 9LCS020299 9LCS020299 9LCS020299 <br /> Date Prepared 2/2/99 2/2/99 2/2/99 2/2/99 <br /> Date Analyzed 2/2/99 2/2/99 2/2/99 2/2/99 <br /> Instrument 1 D # HP-9 HP-9 HP-9 HP-9 <br /> LCS <br /> Recovery- 100 105 100 105 <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,interferent free matrix that is analyzed using the same reagents, <br /> UOIA 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 /> - 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 /> Janne Fegley <br /> Project Manager <br /> 9011723 GET <2> <br />