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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> q 404 N.Wlget Lane Walnut Creek.CA 94598 (925)988-%00 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 /> - .,.:: <br /> at71 S-Ryan Dufjlin Ghent Project Ili: fiosco #11195, Lathrop <br /> Terra Court, Suite J Matrix. Liquid <br /> Dublin, CA 94568 <br /> <? Attention: Clyde Galantine OC Sample Group: 8122371-372 Reported: Jan 15, 1999f <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes MTBE Lead <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 EPA 200.7 <br /> Analyst: C.Westwater C.Westwater C.Westwater C.Westwater N. Nelson J. Kelly <br /> MS/MSD <br /> Batch#: 8122388 8122388 8122388 8122388 8122065 8122403 <br /> Date Prepared: 1/7/99 1/7/99 1/7/99 1/7/99 1/5/99 1/4/99 <br /> Date Analyzed: 1/7/99 1/7/99 1/7/99 1/7/99 1/5/99 1/12/99 <br /> Instrument I.D.#: HP-9 HP-9 HP-9 HP-9 GC/MS-2 MV-4 <br /> Conc. Spiked: 20yg/L 20ug/L 20pg/L 60ug/L 50gg/L 1.0 mg/L <br /> Matrix Spike <br /> % Recovery: 95 100 100 103 114 100 <br /> Matrix Spike <br /> _ Duplicate% <br /> Recovery: 100 105 105 103 104 100 <br /> Relative % <br /> Difference: 5.1 4.9 4.9 0.0 9.2 0.0 <br /> LCS Batch#: 9LCS010799 9LCS010799 9LCS010799 9LCS010799 LCS010599 LCS010499 <br /> Date Prepared: 1/7/99 1/7/99 1/7/99 1/7/99 1/5/99 1/4/99 <br /> Date Analyzed: 1/7/99 1/7/99 1/7/99 1/7/99 1/5/99 1/12/99 <br /> Instrument I.D.#: HP-9 HP-9 HP-9 HP-9 GC/MS-2 MV-4 <br /> LCS % <br /> Recovery: 90 95 100 102 100 100 <br /> Recovery <br /> Control Limits: 70-130 70-130 70-130 70.130 70-130 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 /> 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 recove is to be used to validate the batch. <br /> lianne Fegley <br /> Project Manager <br /> 8122371.GET <5> <br />