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+ . Sequoia 680 Chesapeake Drive Redwood Ciry CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N "get Lane Walnut Creek CA 94598 (9Z5)g88-9600 FAX(925)988-9673 <br /> ttill� Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)9Z1-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(7o7)792-0342 <br /> ettler-Ryan - Dublin Client Project lD Unocal SS#5886, Stockton <br /> W747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9030233-244 Reported Mar 24, 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 Westwatef C Westwater <br /> MS/MSD <br /> Batch# 9030149 9030149 9030149 9030139 <br /> Date Prepared 3/19/99 3y 9 99 3/9/99 3/9/99 <br /> Date Analyzed 3/9/99 3/9/99 3/9/99 3/9/99 <br /> Instrument I D # HP 5 HP 5 HP 5 HP 5 <br /> Conic Spiked 20Mg/L 20pg/L 20,ug/L 60pg,'L <br /> Matrix Spike <br /> % Recovery 110 105 105 107 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 120 115 110 115 <br /> Relative % <br /> Difference 87 91 47 75 <br /> LCS Batch# 5LCS030999 5LCS030999 5LCS030999 5LCS030999 <br /> Date Prepared 3/9/99 3/9/99 3/9/99 3/9/99 <br /> Date Analyzed 3/9/99 3/9/99 3/9/99 3/9/99 <br /> Instrument I D # HP 5 HP 5 HP 5 HP 5 <br /> LCS % <br /> Recovery* 100 105 105 108 <br /> FRecovery <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 /> 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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recove is to be used to validate the batch <br /> ulianne Fegley <br /> ro�ect Manager <br /> 9030233 GET <18> <br />