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J Sequoia 660 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> 819 5tr3ker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(9l6)921-0100 <br /> Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> • <br /> Gettler Ryan/Geostrategies Client Project ID Tosco 6981, 140124 02 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9803H24 -01, 02 Reported Apr 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO32898BTEX03A GCO32898BTEX03A GCO32898BTEX03A GCO326985TEX03A GCO32898BTEX03A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst C DeMartim C DeMartini C DeMartim C DeMartirn C De Martini <br /> MS/MSD# 9803G3201 9803G3201 9803G3201 980363201 980363201 <br /> Sample Conc ND N D N D N D ND <br /> Prepared Date 3/28/98 3/28/98 3/28/98 3/28/98 3/28/98 <br /> Analyzed Date 3/28/98 3/28/98 3/28/98 3/28/98 3/26/98 <br /> Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10ug/L 10Ng/L 10pig/L 30yg/L 60ftg/L <br /> Result 10 11 11 32 62 <br /> 40S % Recovery: 100 110 110 107 103 <br /> Dup Result 10 11 11 33 63 <br /> MSD % Recov 100 110 110 110 105 <br /> RPD 00 00 00 31 16 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS#. BLK032898 BLK032898 BLK032898 BLK032898 BLK032898 <br /> Prepared Date 3/28/98 3/28/98 3/28/98 3/28/98 3/28/98 <br /> Analyzed Date 3/28/96 3/28/98 3/26/98 3/28/98 3/26/98 <br /> Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked' 10pg/L 10ug/L 10ug/L 30frg/L 60frg/L <br /> LCS Result 10 11 11 32 62 <br /> LCS % Recov 100 110 110 107 103 <br /> 60-140 60-140 60.140 60-140 60.140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> VectManager <br /> LYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected 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 /> **MS=Matrix Spike,MSD=MS Duplicate, RPD uRelative%Difference 9803H24 GET <1 i <br />