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Sequoia u® la 680 Chesapeake Drive Redwood City, CA 94063 (650) 364-9600 FAX (650) 364-9233 <br /> J q 404 N. WlSet 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 Ryan - Dublin Client Project ID : Chevron #9-3232 , Stockton <br /> X . <br /> Sr. 6747 Sierra Court, Suite J Matrix: Solid <br /> Dublin, CA 94568 <br /> Attention: Greg Gurss QC Sample Group: 9031105-115 Reported : Mar 171 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method : EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: J. Minkel J. Minkel J. Minkel J. Minkel <br /> MS/MSD <br /> Batch#: 9031120 9031120 9031120 9031120 <br /> Date Prepared : 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 <br /> Instrument 1 - D -#: HP-4 HP-4 HP-4 HP-4 <br /> Cone- Spiked : 0.80 mg/kg 0.80 mg/kg 0.80 mg/kg 2.4 mg/kg <br /> Matrix Spike <br /> % Recovery: 101 88 91 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 100 89 91 100 <br /> Relative % <br /> Difference: 1 .2 1 .4 0.0 0.0 <br /> LCS Batch#: 4LCS031299 4LC8031299 4LCS031299 4LCS031299 <br /> Date Prepared : 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 <br /> Instrument 1 - D -#: HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery: 99 85 88 96 <br /> ecovery <br /> Control Limits: 50-150 50-150 50-150 50-150 <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 /> Y 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 /> anne Fegley <br /> Project Manager <br /> 9031105.GET < 15 > <br />