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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 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(9t6)921 -Ot00 <br /> M 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)79Z-1865 FAX 707 792-0342 <br /> ;t rtler-I yari�l7ubhn vY Yv dlient Projecf]D' ` Vasco (Unocal) SS#`6981, Stockton <br /> 6747 S[erra Court, Suite J Matrix Liquid n <br /> ' Dublin, CA 94568 <br /> ur Attention Deanna Harding CC Sample Group 9011960-973 Reported Feb 18, 1999' <br /> yvY V.}.%w <v r .. � xn ti r til W+ti�ti'� J 3' h u.. '. • n i_ }` u r }r n r } v v r r r r n 4 Ss r r x 4{t{{ <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# 9020287 9020287 9020287 9020287 <br /> Date Prepared 2/7/99 2/7/99 2/7/99 2/7/99 <br /> Date Analyzed 2/7/99 2/7/99 2/7/99 2/7/99 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20 ug/L 20Ng/L 20 Ng/L 60 jig/L <br /> Matrix Spike <br /> %Recovery 80 80 80 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 90 90 100 <br /> Relative% <br /> Difference 12 12 12 69 <br /> LCS Batch# 2LCS020799 21-CS020799 2LC8020799 2LCS020799 <br /> Date Prepared 2/7/99 2/7/99 2/7/99 2/7/99 <br /> Date Analyzed 2/7/99 2/7/99 2/7/99 2/7/99 <br /> Instrument 10 #. HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 95 90 95 105 <br /> L %Recovery <br /> Control Limits 70-130 70130 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 /> QUOIA 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 /> 111aanne Fegley <br /> Project Manager <br /> 9011960 GET <21> <br /> I <br />