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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 (510) 988-9600 FAX(510)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> Analytical <br /> MPDS Services Client Project ID: Tosco#5421,7303 Pacific Ave.,Stockton <br /> 2401 Stanwell Dr., Ste. 300 Matrix. Liquid ' <br /> Concord, CA 94520 <br /> >`Attention: Jarrel Crider QCSample Group: 7121025-029 Reported: Dec 31, 1997::: <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: D. Newcomb D. Newcomb D. Newcomb D. Newcomb <br /> MS/MSD - <br /> Batch#: 7120456 7120456 7120456 7120456 <br /> Date Prepared: 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Date Analyzed: 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Instrument I.Q.#: HP-4 HP-4 HP-4 HP-4 <br /> Conc. Spiked: 20 pg/L 20 pg/L 20 ug/L 60 ug/L <br /> Matrix Spike <br /> % Recovery: 90 95 90 95 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 90 95 90 95 <br /> Relative % <br /> Difference: 0.0 0.0 0.0 0.0 <br /> LCS Batch#: 4LCS121697 4LCS121697 4LCS121697 4LCS121697 <br /> Date Prepared: 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Date Analyzed: 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Instrument Ir.+D.#: HP-4 HP-4 HP-4 HP-4 <br /> LCS <br /> Recovery: 100 105 100 107 <br /> 9/6 ecovery <br /> Control Limits: 70-130 70-130 70-130 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 /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If <br /> Signature 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 �-11> <br /> I� <br />