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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(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> kler-R'ya'n"-bubliri Client Projectlb "'Unocal #2859, Stbckton ` <br /> 6747 Sierra Court, Suite J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Haig Kevork QC Sample Group 904-0008 Reported Apr 7, 1999 <br /> i <br /> QUALITY CONTROL DATA REPORT <br /> A YTE Benzene Toluene Ethyl Xylenes Lead <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br /> Analyst C Westwater C Westwater C Westwater C Westwater J Kelly <br /> MS/MSD <br /> Batch# 9040280 9040280 9040280 9040280 9040096 <br /> Date Prepared 4/6/99 4/6/99 4/6/99 4/6/99 4/2/99 <br /> Date Analyzed, 4/6/99 4/6/99 4/6/99 4/6/99 4/5/99 <br /> Instrument I.Q.#: HP-4 HP-4 HP-4 HP-4 MV-4 <br /> Conc. Spiked 0 80 mg/kg 0 80 mg/kg 0 80 mg/kg 2 4 mg/kg 50 mg/kg <br /> Matrix Spike <br /> % Recovery. 93 79 85 92 86 <br /> . Matrix Spike <br /> Duplicate % <br /> Recovery. 90 78 81 92 86 <br /> Relative % <br /> Difference 27 16 45 00 00 <br /> LCS Batch# 4LC$040699 4LC8040699 4LC$040699 4LCSO40699 LCSO40299 <br /> Date Prepared 4/6/99 4/6/99 4/6/99 4/6/99 4/2/99 <br /> Date Analyzed' 4/6/99 4/6/99 4/6/99 4/8/99 4/5/99 <br /> Instrument I.D #: HP-4 HP-4 HP-4 HP-4 MV-4 <br /> LCS % <br /> Recovery: 98 83 86 96 100 <br /> Recovery <br /> Control Limits. 50-150 50-150 50-150 50-150 80-120 <br /> Please Dote <br /> The LCS is a control sample of known,interferent free matrix that Is analyzed using the same reagents, <br /> 111'anne <br /> 'Uo' ANALYTICAL, #1271 preparation,and anaiytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quare tties of specific compounds and subjected to the entire analytical procedure If <br /> yt/{ 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 /> Fegley <br /> Project Manager <br /> 9040008 GET <3> <br />