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Sequoia 680 Che _,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 /> Aw 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: 9031092- 104 Reported : Mar 17, 1999 , <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1 , 1 -Dichlora- Trichloro- Chloro- MTBE Oil & Grease <br /> ethene ethene benzene <br /> Method : EPA 8010 EPA 8010 EPA 8010 EPA 8260 SM 5520 <br /> Analyst: P. Kosovskaya P. Kosovskaya P. Kosovskaya N. Nelson N. VanSlambrook <br /> MS/MSD <br /> Batch#: 9030166 9030166 9030166 9031092 9031103 <br /> Date Prepared : 3/11 /99 3/11 /99 3/11 /99 3/12/99 3/12/99 <br /> Date Analyzed : 3/11 /99 3/11 /99 3/11 /99 3/14/99 3/14/99 <br /> Instrument LD .#: HP-6 HP-6 HP-6 GC/MS-2 Manual <br /> Conc. Spiked : 100opg/kg 1000pg/kg 1000 µg/kg 2500pg/kg 5000mg ,kg <br /> Matrix Spike <br /> % Recovery: - 150 170 160 113 122 <br /> Matrix Spike <br /> Duplicate <br /> Recovery: 140 160 140 113 126 <br /> Relative <br /> Difference: 6.9 6. 1 13 0.0 3,2 <br /> ILI <br /> LCS Batch#: LCS031299 LCS031299 LCS031299 LCS031299 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 3/14/99 3/14/99 <br /> Instrument I . D .#: HP-6 HP-6 HP-6 GC/MS-2 Manual <br /> LCS % <br /> Recovery: 120 130 130 100 116 <br /> Recovery <br /> Control Limits: 65-135 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 over the matrix spike does not fall within specified control limits due to matrix <br /> auli�nr <br /> Interference, the LCS recove is to be used to validate the batch. <br /> e Fegley <br /> Project Manager <br /> 9031092.GET e27> <br />