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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 4041 ,Wlget 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 /> ttler-Ryan- Dublin Tient Project ID. Tosco 9P#11195, Lathrop ' <br /> 0747 Sierra Court, Suite J Matrix: Solid <br /> Dublin, CA 94568 <br /> Attention: Clyde Galantine DC Sample Group: 9010010-025 Reported: Jan 20, 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.Westwater C.Westwater <br /> MS/MSD <br /> Batch#: 9010222 9010222 9010222 9010222 <br /> Date Prepared: 1/7/99 1/7/99 1/7/99 1/7/99 <br /> Date Analyzed: 1/7/99 1/7/99 1/7/99 1/7/99 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 <br /> Conc. Spiked: 0.80 mg/kg 0.80 mg/kg 0.80 mg/kg 2.4 mg/kg <br /> Matrix Spike <br /> % Recovery: 103 86 89 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 104 88 90 100 <br /> Relative % <br /> Difference: 1.2 1.4 1.4 0.0 <br /> LCS Batch#: 4LCS010799 4LCS010799 4LCS010799 4LCS010799 <br /> Date Prepared: 1/7/99 1/7/99 1/7/99 1/7/99 <br /> Date Analyzed: 1/7/99 1/7/99 1/7/99 1/7/99 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery: 119 100 101 113 <br /> Recovery <br /> Control Limits: 50-150 50-150 50-150 50-150 <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 /> )Jl�lanne <br /> the recovery of analytes from tale 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.Fegley <br /> oject Manager <br /> 9010010.GET <22> <br />