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Sequoia 680 C, .peake 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 /> 819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916 ) 921 -9600 FAX (916) 921 - 0100 <br /> Analytical 1455 McDowell Blvd. North, Ste. D Petaluma, CA 94954 (707) 792- 1865 FAX (707) 792-0342 <br /> Gettler-Ryarl - Dublin Client Project ID. Chevron #9 3232, Stockton <br /> 6747 Sierra Court, Suite J Matrix: Liquid <br /> Dublin, CA 94568 <br /> Attention : Greg Gurss QC Sample Group: 9031101 -103 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#: 9030604 9030604 9030604 9030604 9031104 <br /> Date Prepared : 3/ 12/99 3/12/99 3/ 12/99 3/ 12/99 3/14/99 <br /> Date Analyzed : 3/ 12/99 3/12/99 3/12/99 3/12/99 3/ 14/99 <br /> Instrument I .D.#: HP-2 HP-2 HP-2 HP-2 GC/MS-2 <br /> Conc, Spiked : 20 pg/L 20 pg/L 20 pg/L 60 pg/L 50 pg/L <br /> Matrix Spike <br /> Recovery: 95 95 100 105 98 <br /> Matrix Spike <br /> Duplicate <br /> Recovery: 80 75 90 95 98 <br /> Relative <br /> Difference: 17 24 11 10 100 <br /> LCS Batch#: 2LCS031299 2LCS031299 2LCS031299 2LCS031299 LCS031499 <br /> Date Prepared : 3/12/99 3/12/99 3/12/99 3/12/99 3/14/99 <br /> Date Analyzed : 3/12/99 3/12/99 3/12/99 3/12/99 3/14/99 - <br /> Instrument I . D .# : HP-2 HP-2 HP-2 HP-2 GC/MS-2 <br /> LCS <br /> Recovery: 100 95 100 108 102 <br /> ecovery <br /> Control Limits : 70-130 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 /> 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 /> J lianne Fegley <br /> Project Manager <br /> 9031092,GET <29 > <br /> -f7, <br />