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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-%73 <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 /> Ocbtfler-Ftyan-Dublin v AV Client project 10 Tosco`(Unocal)SS#6981; Stoci<ton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> j Dublin, CA 94568 <br /> v Attention Deanna Harding OC Sample Group 9011960-973 Reported Feb 18, 1999 <br /> o.t r7k ,ia� r,„`i r ? ' t.'.,. c„,, , car r+'e • r o ` n n ..r .r. ,. r wt < r , ,." h vr i <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#- 9011963 9011963 9011963 9011963 <br /> Date Prepared 2/5/99 2/5/99 2/5/99 2/5/99 <br /> Date Analyzed 2/5/99 2/5/99 2/5/99 2/5/99 <br /> Instrument I D # HP-2 HP 2 HP 2 HP-2 <br /> Conc Spiked 20}x9/L 20ug/L 20Y9/L 60ug/L <br /> Matrix Spike <br /> % Recovery, 90 90 95 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 90 95 102 <br /> Relative % <br /> Difference 0 0 00 00 1 7 <br /> LCS Batch# 2LCS020599 2LCS020599 2LCS020599 2LCS020599 <br /> Date Prepared 2/5/99 2/5/99 2/5/99 2/5/99 <br /> Date Analyzed 2/5/99 2/5/99 2/5/99 2/5/99 <br /> Instrument I D.# HP-2 HP-2 HP-2 HP 2 <br /> LCS % <br /> Recovery 85 85 90 97 <br /> ecovery <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 /> QUOTA 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 /> Julianne Fegley <br /> Project Manager <br /> 9011960 GET <18> <br />