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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> lieAnalytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> RoyF Weston Client Project ID San Joaquin County Capitol Projects <br /> I q tY <br /> 2300 Clayton Rd , Suite 1580 Matrix Soil <br /> Concord, CA 94520-2148 <br /> Attention David Marks OC Sample Group 5070280-286 Reported Jul 27, 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 Chapman C Chapman C Chapman C Chapman C Lee <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 7 5 mg/kg <br /> LCS Batch# LCS071995 LCS071995 LCS071995 LCS071995 LCS071995 <br /> Date Prepared 7/19/95 7/19/95 7/19/95 7/19/95 7/19/95 <br />' Date Analyzed 7/19/95 7/19/95 7/19/95 7/19/95 7/20/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-3B <br />� . LCS <br /> Recovery 98 99 99 98 108 ' <br /> Control Limits 75-125 75-125 75-125 75-125 60-130 <br /> MS/MSD <br /> Batch # 5070395 5070395 5070395 5070395 5070445 <br /> Date Prepared 7/19/95 7/19/95 7/19/95 7/19/95 7/17/95 <br />' Date Analyzed 7/19/95 7/19/95 7/19/95 7/19/95 7/20/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-3B <br /> Matrix Spike <br /> % Recovery 94 94 96 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 94 96 97 98 <br /> Relative% <br /> Difference 00 21 1 a 00 <br />' SEQUOIA ANALYTICAL Please!vote <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> y r�+� 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 OC limits for MS/MSD's are advisory only <br /> Linda C Schneider and are not used to acceptor reject batch results *Matrix interference <br /> Project Manager <br /> 5070280 ROY <5> <br />