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,TUN - 14 - 95 THU 10 : 13 2 2 P . 04 <br /> Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364 -9600 FAX (415) 364-9233 <br /> 1900 Bates Avenue, Suite L Concord, CA 94520 (510) 686-9600 FAX (510) 686.9689 <br /> 819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916) 921 .9600 FAX (916) 921 .0100 <br /> Analytical <br /> .;:Touchstone Development Client Project ID: 8632-2,Chevron 9-8632 <br /> P-O, Box 2554 Matrix: Solid <br /> FjSanta Rosa, CA 95405 <br /> 1 4=i. <br /> o <br /> rted: Augttention: Jeff Monroe QC Sample Group Re 9408E43 01 -03 Reported:. . . ... . . <br /> 29 99 .. <br /> 1bF< . : <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: E. Cunanan E. Cunanan E. Cunanan E. Cunanan <br /> MS/MSD <br /> Batch#: 9408C7602 940807602 940807602 940807602 _ <br /> Date Prepared : 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Date Analyzed : 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Cone. Spiked : 0.20 ppm 0.20 ppm 0.20 ppm 0.60 ppm <br /> Matrix Spike <br /> % Recovery: 95 100 100 98 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 95 95 95 93 <br /> Relative % <br /> Difference: 0.0 5. 1 5.1 5.2 <br /> LCS Batch#: <br /> Date Prepared : <br /> Date Analyzed : <br /> Instrument I.D.#: <br /> LCS % <br /> Recovery: <br /> % Recovery <br /> Control Limits: 55. 145 47-149 47-155 5& 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 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. H <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 /> Vickie Tague Clark <br /> Project Manager g4o8E43,TtT < 1 > <br />