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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364-9600 FAX (650) 364- 9233 <br /> 404 N. Wiget 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 /> Gettler Ryan - Dublin Client Project ID . Chevron #9-3232 , Stockton <br /> 6747 Sierra Court, Suite J Matrix: Solid <br /> Dublin , CA 94568 <br /> Attention : Greg Gurss QC Sample Group : 9031116-129 Reported : Mar 16, 19991 111;::' <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Mercury <br /> Method : EPA 7471 <br /> Analyst: T. Le <br /> MS / MSD <br /> Batch# : 9031125 <br /> Date Prepared : 3/ 15/99 <br /> Date Analyzed : 3/15/99 <br /> Instrument I . D .# : MV-1 <br /> Cone. Spiked : 0. 10 mg/kg <br /> Matrix Spike <br />,I <br /> Recovery : 109 <br /> Matrix Spike <br /> Duplicate <br /> Recovery: 109 <br /> Relative <br /> Difference : 0.0 <br /> LCS Batch# : LCS031599 <br /> Date Prepared : 3/ 15/99 <br /> Date Analyzed : 3/ 15/99 <br /> Instrument I . D .#: My- 1 <br /> LCS <br /> Recovery: 120 <br /> Recovery <br /> Control Limits : 75-125 <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 recovery Is to be used to validate the batch. <br /> )ulanne Fegley <br /> Project Manager <br /> 9031116.GET < 37 > <br />