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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 (925) 988-9673 <br /> 819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916) 921 -9600 FAX (916) 921 - 0100 <br /> Tow Analytical 1455 McDowell Blvd. North, Ste. D Petaluma, CA 94954 (707) 792- 1865 FAX (707) 792-0342 <br /> Gettler Ryan-Dublin Client Project ID : Chevron A 3232, Stockton <br /> 6747 Sierra Court, Suite J Matrix: Solid <br /> . Dublin, CA 94568 <br /> Attention: Greg Gurss QC Sample Group: 9031092-104 Reported : Mar 17, 1999 <br /> xo <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: C. Westwater C. Westwater C, Westwater C. Westwater <br /> MS/MSD <br /> Batch# : 9031114 9031114 9031114 9031114 <br /> Date Prepared : 3/15/99 3/15/99 3/15/99 3/15/99 <br /> Date Analyzed : 3/15/99 3/15/99 3/ 15/99 3/15/99 <br /> Instrument I . D.#: HP-4 HP-4 HP-4 HP-4 <br /> Conc. Spiked : 0.80 mg/kg 0,80 mg/kg 0.80 mg/kg 2.4 mg/kg <br /> Matrix Spike <br /> % Recovery: 103 90 94 104 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 101 89 91 104 <br /> Relative % <br /> Difference: 1 .2 1 .4 2.7 0.0 <br /> xx <br /> LCS Batch# : 4LCS031599 4LCS031599 4LCS031599 4LCS031599 <br /> Date Prepared : 3/15/99 3/15/99 3/15/99 3/15/99 <br /> Date Analyzed : 3/15/99 3/15/99 3/15/99 3/15/99 <br /> Instrument I . D.#: HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery: 91 79 85 96 <br /> ecovery <br /> Control Limits: 50-150 50-150 50-150 50-150 <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 /> tAY1� the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Ifanne gley <br /> Interference, the LCS recoveryis to be used to validate the batch , <br /> Fe <br /> Project Manager <br /> 9031092.GET <26 > <br /> PS <br />