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610 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX <br /> Sequoia .(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988.9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> APDS Seir'v"keS" <br /> Client Project 10: tosco#5421,7303 Pacific Ave.,Stockton <br /> 2401 Stanwell Dr., Ste. 300 Matrix: Liquid <br /> Concord, CA 94520 <br /> Attention: Jarrel Crider QC Sample Group: 7121025-029 Reported: Dec 31, 1997' <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Diesel <br /> Method: EPA 8015M <br /> Analyst: K. Grubb <br /> MS/MSD <br /> Batch#: BLK121597A <br /> Date Prepared: 12/15/97 <br /> Date Aneflyzed: 12/16/97 <br /> Instrument I.D.#: HP-3121 <br /> Conc. Spiked: 500 jug/L <br /> Matrix Spike <br /> %Recovery: 56 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 74 <br /> Relative % <br /> Difference: 27 <br /> ..................... <br /> .......... . . .. . . . . . .......... <br /> .. ............................. <br /> ....................................... . <br /> .......... ...... <br /> LCS Batch#: ;CS121597A <br /> Date Prepared: 12/15/97 <br /> ,Date Analyzed: 12/16/97 <br /> Instrument I.D.#: HP-313 <br /> LCS % <br /> Recovery: 54 <br /> Recovery <br /> Control Limits: 60-140 <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 /> USignature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B. Kemp interference,the LCS recovery is to be used to validate the batch. <br /> Project Manager <br /> 7121025.MPD <12> <br />