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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N W1get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite a Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Roy F Weston Client Project ID San Joaquin County MVCb <br /> One Concord Center, Suite 150 Matrix Water <br /> 2300 Clayton Road <br /> Concord, CA 94520-2148 OC Sample Group 5060985-988 Reported Jul 5, 1995 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> 1 <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 pg/L 10 fug/L 10 ug/L 30 Yg/L 300 fig/L <br /> LCS Batch# LCS062395 LCS062395 LCS062395 LCS062395 LC8062195 <br /> Date Prepared 6/23/95 6/23/95 6/23/95 6/23/95 6/21/95 <br /> Date Analyzed 6/23/95 6/23/95 6/23/95 6/23/95 6/30/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-3B <br /> LCS y <br /> Recovery 90 91 92 91 77 <br />' Control Limits 75-125 75-125 75-125 75-125 60-130 <br />' MS/MSD <br /> Batch # BS062395 BS062395 BS062395 BS062395 BS062195 <br />' Date Prepared 6/23/95 6/23/95 6/23/95 6/23/95 6/21/95 <br /> Date Analyzed 6/23/95 6/23/95 6/23/95 6/23/95 6/30/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-3P <br />' Matrix Spike <br /> % Recovery 89 90 91 91 77 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 89 88 92 91 90 <br /> Relative% <br /> Difference 00 22 11 00 16 <br />' SEQUOIA ANALYTICAL Please]vote <br /> 1 The LCS is a control sample of known,Interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data Is used for <br />' _ /L c„i �'�� validation of sample batch results Due to matrix effects,the CC limits for MS/MSD s are advisory only <br /> C <br /> Linda Schneider and are not used to accept or reject batch results <br /> Project Manager <br />' 5060985 ROY <3> <br />