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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 819 Striker Avenue, Suite 8 Sacramento. CA 95834 (916) 921 -9600 FAX (916 ) 921 - 0100 <br /> q1W1455 McDowell Blvd, North, Ste. D Petaluma, CA 94954 (707) 792- 1865 FAX (707) 792- 0342 <br /> Gettler-Ryan Dublin Client Project ID : Chevron #93232, 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 Diesel <br /> Benzene <br /> Method : EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 M. <br /> Analyst: C. Westwater C. Westwater C. Westwater C. Westwater K. Grubb <br /> MS/ MSD <br /> Batch#: 9030972 9030972 9030972 9030972 9031102 <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/ 12/99 <br /> Instrument I. D.#: HP-5 HP-5 HP-5 HP-5 HP-38 <br /> Cone. Spiked : 0.50 mg/kg 0.50 mg/kg 0.50 mg/kg 2.4 mg/kg 15 mg/kg <br /> Matrix Spike <br /> % Recovery: 109 111 113 117 80 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 109 111 111 117 73 <br /> Relative % <br /> Difference: 0.0 0.0 1 . 1 0.0 8.7 <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 3/12/99 <br /> Instrument I .D .#: HP-5 HP-5 HP-5 HP-5 HP-3A <br /> LCS % <br /> Recovery: 111 113 110 113 87 <br /> Recovery <br /> Control Limits: 50-150 50-150 50-150 50-150 60-140 <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 /> �vl��� � ,(� � � 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 /> Project Manager <br /> 9031116.GET < 30 > <br />