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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 /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)911-0100 <br /> Analytical 1455 McDowell Blvd.North.Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> .. . . .:.....:. . ....... <br /> ::.:........... . <br /> Uettler-Ryan - bubiin ............Client Project ID: Tosco#11195,Lathrop <br /> 6747 Sierra Court, Suite J Matrix: Solid <br /> Dublin, CA 94568 <br /> p <br /> Y P.._..,.._ ......p.'.::_::_81 <br /> Attention: Clyde Galantine DC Sample Group: 8122352-362 Reported: Jan 21, 1999'-' <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Lead MTBE <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 EPA 8260 <br /> Analyst: C.Westwater C.Westwater C.Westwater C.Westwater J. Kelly B. Pitamah <br /> MS/MSD <br /> Batch#: 8122354 8122354 8122354 8122354 8122353 990158412 <br /> Date Prepared: 12/31/98 12/31/98 12/31/98 12/31/98 12/31/98 1/13/99 <br /> Date Analyzed: 12/31/98 12/31/98 12/31/98 12/31/98 1/4/99 1/14/99 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 MV-4 F2 <br /> Conc. Spiked: 0.80 mg/kg 0.80 mg/kg 0.80 mg/kg 2.4 mg/kg 50 mg/kg 2500 pg/kg <br /> Matrix Spike <br /> % Recovery: 91 80 84 96 100 76 <br /> Matrix Spike <br /> Duplicate <br /> Recovery: 93 83 85 96 94 so <br /> Relative % <br /> Difference: 1.4 3.1 1.5 0.0 6.2 5.1 <br /> LCS Batch#: 4LCS123198 4LCS123198 4LCS123198 4LCS123198 LCS123198 VMB01130 <br /> Date Prepared: 12/31/98 12/31/98 12/31/98 12/31/98 12/31/98 1/13/99 <br /> Date Analyzed: 12/31/98 12/31/98 12/31/98 12/31/98 1/4/99 1/13/99 <br /> Instrument I-D.#: HP-4 HP-4 HP-4 HP-4 MV-4 F2 <br /> LCS % <br /> Recovery: 101 89 94 104 96 104 <br /> Recovery <br /> Control Limits: 50.150 50-150 50-150 50-150 80-120 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 /> #1210 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 /> JlWianne Fegley <br /> Project Manager <br /> 8122352.GET <15> <br />