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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> a) 404 N Wiget 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 /> w,- Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategies Client Project ID Tosco SS#6981, 180138 85 vn n k <br /> -6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 98051-147 01-13 Reported Jun 16, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# 06Y8078 06Y8078 06Y8078 06Y8078 <br /> Analy Method EPA 8015M/8020M EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst NA. N A. N A. N A. <br /> LCS/LCSD # LCS060498 LCS060498 LCS060498 LCS060498 <br /> Sample Conc. N D N D N D N D <br /> Prepared Date 6/4/98 6/4/98 6/4/98 6/4/98 <br /> Analyzed Date 6/4/98 6/4/98 6/4/98 6/4/98 <br /> Instrument I D # N A. NA N A. N A. <br /> Conc Spiked 20yg/L 20ug/L 20ug/L 20ug/L <br /> Result 22 21 19 22 <br /> LCS % Recov 220 110 95 110 <br /> Dup Result 23 22 20 22 <br /> LCSD % Recov 120 110 100 110 <br /> RPD 87 00 51 00 <br /> RPD Limit 0-30 0-30 0-30 0-30 <br /> LCS <br /> Control Limits 80-120 80-120 80-120 80-120 <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 /> LAP#1849 fortified with known quantities of specific compounds and sub)ected 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 /> Tod Granicher <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9805H47 GET <1> <br />