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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)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-010 0 <br /> 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> -_;aettler-Ryan -Dublin client Project ID: Tosco 76#11195, LatFtrop <br /> 6747 Sierra Court, Suite J Matrix: Solid <br /> Dublin, CA 94568 <br /> Attention: Doug Lee QC Sample Group: 9010988-992 Reported: Jan 21, 1999::: <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 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#: 9010988 9010988 9010988 9010988 9010996 <br /> Date Prepared: 1/19/99 1/19/99 1/19/99 1/19/99 1/20/99 <br /> Date Analyzed: 1/19/99 1/19/99 1/19/99 1/19/99 1/20/99 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 MV-3 <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: 98 91 91 113 - <br /> Matrix Spike <br /> "= = Duplicate % <br /> Recovery: 104 98 99 121 <br /> Relative % <br /> Difference: 6.2 6.6 7.9 7.1 - <br /> ..................................................................... .......................... ..................... . .......................... ...................................................................................... <br /> LCS Batch#: 4LCS011999 4LCS011999 4LCS011999 4LCS011999 LCS012099 <br /> Date Prepared: 1/19/99 1/19/99 1/19/99 1/19/99 1/20/99 <br /> Date Analyzed: 1/19/99 1/19/99 1/19/99 1/19/99 1/20/99 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 MV-3 <br /> LCS % <br /> Recovery: 125 110 114 125 106 <br /> Recovery <br /> Control Limits: 50-150 50-150 50-150 50-150 80-120 <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 /> u J 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 /> Julianne Fegley <br /> Project Manager <br /> 9010988,GET <3> <br /> .Pg. <br />