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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> Analytical 1900 Bates Avcnuc 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 /> pe Bnv Mngmt , Inc Client Project ID Federal Bldg (Stockton), Prol #24030 10 <br /> 280 S Vermont Avenue Matrix Soil <br /> orrance, CA 90502 <br /> Attention Larry Harlan QC Sample Goup 4070069-75 Reported Jul 11, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloroethene Trichloroethene Chloro- <br /> benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Neu K Nill k Nill <br /> Concentration <br /> Spiked 10 ppb 10 ppb 10 ppb <br /> LCS Batch# LCS071194 LCS071194 LCS071194 <br /> Date Prepared 7111194 7/11/94 7111194 <br /> Date Analyzed 7111194 7111194 7111194 <br /> Instrument I D # HP589af7 HP5890f7 HP5890f7 <br /> LCS% <br /> Recovery. 94 95 101 <br /> Control Limits 28-167 35-146 38-150 <br /> MS/MSD <br /> Batch# 4070404 4070404 4070404 <br /> Date Prepared 7111/94 7111194 7111/94 <br /> Date Analyzed 7111194 7/11194 7111194 <br /> Instrument l D # HP589017 HP589017 HP5890T7 <br /> Matrix Spike <br /> % Recovery 71 103 114 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 67 98 97 <br /> Relative% <br /> Difference 44 so 16 <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 LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> G�L C. and are not used to accept or reject batch results <br /> Craig C L <br /> Project Manager <br /> 4070068 CCC �7> <br />