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11!� Sequoia 680 Chesapeake Dave Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Ana�yt�ea� 404 NWiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Roy P Weston Client Project Ib SJCMVC❑ <br /> 2300 Clayton Rd , Suite 1580 Matrix Water <br /> Concord, CA 94520-2148 <br /> Attention Carl Roner OC Sample Group 5090698-701 Reported Oct 6, 1995 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br />' Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Analyst- C Lee C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked. 10 ug/L 10 pg/L 10 Mg/L 30 erg/L 300 ug/L <br /> LCS Batch# LC8092695 LC8092695 LCS092695 LCS092695 LCS092195A <br /> Date Prepared 9/26/95 9/26/95 9/26/95 9/26/95 9/21/95 <br /> Date Analyzed 9/26/95 9/26/95 9/26/95 9/26/95 9/26/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-3B <br /> LCS % <br /> Recovery 99 96 100 96 90 <br /> Control Limits: 75-125 75-125 75-125 75-125 60-130 <br /> MS/MSD <br /> Batch# BS092696 BS092695 B8092695 BS092695 BS092195 <br />' Date Prepared 9/26/95 9/26/95 9/26/95 9/26/95 9/21/95 <br /> Date Analyzed 9/26/95 9/26/95 9/26/95 9/26/95 9/26/95 <br /> Instrument I D #' GCHP-2 GCHP 2 GCHP-2 GCHP-2 GCHP-3B <br /> Matrix Spike <br /> %Recovery 100 99 100 99 90 <br />' Matrix Spike <br /> Duplicate% <br /> Recovery 97 93 98 97 93 <br /> Relative% <br /> Difference 30 6 2 20 20 33 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> y <br /> ��s preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br />' 5090698 ROY <3> <br />