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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 <br /> 7 819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916 ) 921 - 9600 FAX ( 916) 921 - 0100 <br /> it � Analy}ical 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, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Oil & Grease <br /> Benzene <br /> Method : EPA 8020 EPA 8020 EPA 8020 EPA 8020 SM 5520 <br /> Analyst: J. Minkel J. Minkel J. Minkel J. Minkel N. VanSlambrook <br /> MS/MSD <br /> Batch#: 9031120 9031120 9031120 9031120 9031103 <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 3/14/99 <br /> Instrument 1. D .#: HP-4 HP-4 HP-4 HP-4 Manual <br /> Conc- Spiked : 0.80 mg/kg 0.80 mg/kg o.8o mg/kg 2.4 mg/kg 5000 mg/kg <br /> Matrix Spike <br /> % Recovery: 101 88 91 100 122 <br /> Matrix Spike <br /> Duplicate <br /> Recovery: 100 89 91 100 126 <br /> Relative <br /> Difference: 1 .2 1 .4 0.0 0.0 3.2 <br /> YX <br /> LCS Batch#: 4LCS031299 4LC3031299 4LCS031299 4LCS031299 LCS031299 <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 3/14/99 <br /> Instrument I , D.#: HP-4 HP-4 HP-4 HP-4 - Manual <br /> LCS <br /> Recovery: 99 85 88 96 116 <br /> Recovery <br /> Control Limits : 50-150 50-150 50-150 50-150 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 /> 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 /> ullanne Fegley <br /> Project Manager <br /> 9031116.GET < 31 > _ <br />