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I / 680 Chesapeake Drive Redwood City, CA 94063 (650) 364-9600 FAX (650) 364-9233 <br /> Sequoia <br /> 404 N. Wiget lane Walnut Creek, CA 94598 (925) 988-9600 FAX (925) 988-9673 <br /> I! 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) 79Z- 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 /> i Dublin, CA 94568 <br /> i Attention : Greg Gurss QC Sample Group: 9031092-104 Reported : Mar 17, 19991.: <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> Method : EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 M. <br /> Analyst: J. Minkel J. Minkel J. Minkel J. Minkel K. Grubb <br /> MS/MSD <br /> Batch#: 9031120 9031120 9031120 9031120 9031102 <br /> Date Prepared : 3/12/99 3/12/99 3/12/99 3/12/99 3/12/99 <br /> Date Analyzed : 3/15/99 3/15/99 3/15/99 3/15/99 3/12/99 <br /> Instrument I .D.#: HP-4 HP-4 HP-4 HP-4 HP-3B <br /> Cone, Spiked : 0.80 mg/kg 0.80 mg/kg 0.80 mg/kg 2.4 mg/kg 15 mg/kg <br /> Matrix Spike <br /> Recovery: 101 88 91 100 80 <br /> Matrix Spike <br /> Duplicate <br /> Recovery: 100 89 91 100 73 <br /> Relative <br /> Difference : 1 .2 1 .4 0.0 0.0 8.7 <br /> LCS Batch#: 4LCS031299 4LCS031299 4LCS031299 4LCS031299 LCS031299 <br /> i <br /> Date Prepared : 3/12/99 3/12/99 3/12/99 3/12/99 3/12/99 <br /> Date Analyzed : 3/15/99 3/15/99 3/15/99 3/15/99 3/12/99 <br /> Instrument I . D.#: HP-4 HP-4 HP-4 HP-4 HP-3A <br /> LCS % <br /> Recovery: 99 85 88 96 87 <br /> Recovery <br /> Control Limits: 50-150 50-150 50-150 50-150 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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> U interference, the LCS recovery is to be used to validate the batch. <br /> rianneFegley <br /> Project Manager <br /> 9031092.GET <25 > <br /> i <br />`� rx� <br />