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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(92 5)988-9673 <br /> X17 Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)92t-9600 FAX(9t6)921-0100 <br /> 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ..:::.:::..:. :...:....::....... . .. - :: .....-................. <br /> ;:;:paler-Ryan-Dublin' Client Project ID: Tosco#11'195, Lathrop <br /> ::- 747 Sierra Court, Suite.! Matrix: Solid <br /> Dublin, CA 94568 <br /> Attention: Haig Kevork QC Sample Group: 902-0620 Reported: Feb 8, 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#: 9020076 9020076 9020076 9020076 9020620 <br /> Date Prepared: 2/5/99 2/5/99 2/5/99 2/5/99 2/8/99 <br /> Date Analyzed: 2/5/99 2/5/99 2/5/99 2/5/99 2/8/99 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 MV-4 <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: 105 93 96 108 90 <br /> ; r. Matrix Spike <br /> ' Duplicate % <br /> Recovery: 113 99 101 113 84 <br /> Relative % <br /> Difference: 6.9 6.5 5.1 3.8 6.9 <br /> LCS Batch#: 4LCS020599 4LCS020599 4LCS020599 4LOS020599 LCS020899 <br /> Date Prepared: 2/5/99 2/5/99 2/5/99 2/5/99 2/8/99 <br /> Date Analyzed: 2/5/99 2/5/99 2/5/99 2/5/99 2/8/99 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 MV-4 <br /> LCS % <br /> Recovery: 96 83 86 96 96 <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 /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If <br /> �'WD&M&V' the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Interference,the LCS recoveryis to be used to validate the batch. <br /> lianne Fegley <br /> Project Manager <br /> 9020620.GET <3> <br />