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J - <br /> ■ ` Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> ���••,•••���� /� �aa��L 4 1 l�r�7 <br /> 900 Rat"Avcnue,-Suite-L Concord,CA 94520 (510) 686-9600 FAX(510)686-9689 <br /> 1 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> - <br /> Superior Precision Analytical Client Project ID: 15334, Chevron 9 1918 <br /> 1555 Burke St., Unit 1 Matrix: Solid <br /> ""San Francisco, CA94124 <br /> -"Attention: Rich or Cecilia QC Sample Group: 4CG2501-03 Reported: Apr 6, <br /> ::::::::::...:....:.:........... <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichloro- Chloro- <br /> ethene ethene benzene <br /> Method: EPA 8010 EPA 8010 EPA 8010 <br /> Analyst: D.Nelson D.Nelson D.Nelson <br /> MS/MSD <br /> Batch#: 4CG 1801 4CG 1801 4CG t 801 <br /> Date Prepared: 4/1/94 4/1/94 4/1/94 <br /> Date Analyzed: 4/1/54 4/1/94 4/1/94 <br /> Instrument I.D.#: GCHP-8 GCHP-8 GCHP-8 <br /> Conc. Spiked: 25pg/kg 25 ug/kg 25 ug/kg <br /> Matrix Spike <br /> %Recovery: 86 100 76 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 108 84 <br /> Relative% <br /> Difference: 4.1 7.7 10 <br /> LCS Batch#: - - <br /> Date Prepared: - - <br /> Date Analyzed: <br /> Instrument LD.#: - <br /> LCS% <br /> Recovery: - - - <br /> % Recovery <br /> Control Limits: 28-167 35-146 38.150 <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 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 /> Suzanne Chin <br /> 1...Project Manager 4CG2501.SSS <4> <br />