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Sequoia 680&peake Drive Redwood City,CA 940 (650)364-9600 FAX(650)364-9233 <br /> ID 404 N.Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue.Suite 8 Sacramento,CA 95834 (916)921-9600 FAX 916921-0100 <br /> Analytical <br /> 1455 McDowell Blvd.North.Ste.D Petaluma.CA 94954 (707 792-1865 FAX(707)792-0342 <br /> . ;;:.::;:;:.;:.;:.;:.;:.;:;fS?:::::i:<;;.:::.:;.;.::.;:.;:.;:.:::: <br /> Qetgler- cyan <br /> -"Dublin Client Project ID: Bosco 76#fl'!93 Stockton <br /> 6747 Sierra Court, Suite J Matrix: Solid <br /> Dublin, CA 94568 <br /> Attention: Haig Kevork QC Sample Group: 8120913-918 Reported: Dec 16, 1998:..'. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst: D. Newcomb D. Newcomb D.Newcomb D. Newcomb N.Nelson <br /> MS/MSD <br /> Batch#: 8120646 8120646 8120646 8120646 LCS121198 <br /> Date Prepared: 12/9/98 12/9/98 12/9/98 12/9/98 12/11/98 <br /> Date Analyzed: 12/9/98 12/9/98 12/9/98 12/9/98 12/11/98 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 GC/MS-2 <br /> Conc. Spiked: 0.80 mg/kg 0.80 mg/kg 0.80 mg/kg 2.4 mg/kg 2500 jig/kg <br /> Matrix Spike <br /> % Recovery: 103 89 90 100 112 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 99 85 88 100 124 <br /> Relative% <br /> Difference: 3.7 4.3 2.8 0.0 10 <br /> LCS Batch#: 4LCS121198 4LCS121198 4LCS121198 4LCS121198 <br /> Date Prepared: 12/11/98 12/11/98 12/11/98 12/11/98 <br /> Date Analyzed: 12/11/98 12/11/98 12/11/98 12/11/98 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 <br /> LCS% <br /> Recovery: 99 84 88 96 - <br /> ecovery <br /> Control Limits: 50-150 50-150 50-150 50-150 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 recovery is to be used to validate the batch. <br /> ?1anne Fegley <br /> Project Manager <br /> 8120913.GET <8> <br />