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_ _ <br />^ / Sequoia 680 Chesapeake Drive Redwood City. CA 94063 (650) 364-9600 FAX (650) 364-9233 <br /> �.� J 404 N. Wiser lane Walnut Creek, CA 94598 (925) 988-9600 FAX (925) 988-9673 <br /> qlW _ 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) 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: 9031105-115 Reported : Mar 17, 1999 <br />! QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene <br /> Method : EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst: C. Westwater C. Westwater C. Westwater C. Westwater N. Nelson <br /> MS/MSD <br /> Batch#: 9030972 9030972 9030972 9030972 9031092 <br /> Date Prepared : 3/ 12/99 3/12/99 3/12/99 3/12/99 3/ 12/99 <br /> Date Analyzed : 3/ 12/99 3/12/99 3/12/99 3/12/99 3/ 14/99 <br /> Instrument I. D .#: HP-5 HP-5 HP-5 HP-5 GC/MS-2 <br /> Conc. Spiked : 0.80 mg/kg 0.80 mg/kg 0.80 mg/kg 2.4 mg/kg 2500 pg/kg <br /> Matrix Spike <br /> % Recovery: 109 111 113 117 113 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 109 111 111 117 113 <br /> i <br /> Relative % <br /> j Difference: 0.0 0.0 1 .1 0.0 0.0 <br /> V11 I <br /> LCS Batch#: 5LCS031299 5LCS031299 5LCS031299 5LCS031299 LCS031299 <br /> Date Prepared : 3/12/99 3/12/99 3/12/99 3/12/99 3/ 12/99 <br /> Date Analyzed : 3/12/99 3/12/99 3/12/99 3/12/99 3/14/99 <br /> Instrument I .D .#: HP-5 HP-5 HP-5 HP-5 GC/MS-2 <br /> LCS % <br /> Recovery: 111 113 110 113 100 <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 />`r <br /> rnn Fegley <br /> Project Manager <br /> r <br /> 9031105.GET < 14> <br />