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r <br /> „ Sequoia 680 Chesapcake Drive Rcdwood City,CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wig<t Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue Suitell Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal SS#0187,280045 85 <br /> 6747 Sierra Court, Ste J Matrix Liquid x <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order # 9803523-02 Reported Mar 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC031198STEX21A GC031198BTEX2IA GCO31198BTEX21A GCO311988TEX21A GC031198BTEX21A <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 DeMartini C DeMartini C DeMartini C DeMarttnl C DeMartini <br /> MS/MSD # 980361501 980361501 980361501 980361501 980361501 <br /> Sample Conc N D N D N D ND ND <br /> Prepared Date 3/11/98 3/11/98 3/11/98 3/11/98 3/11/98 <br /> Analyzed Date 3/11/98 3/11/98 3/11/98 3/11/98 3/11/98 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked 10 pg/L 10 fug/L 10 pg/L 30 yg/L 60 pg/L <br /> Result 10 98 10 30 51 <br /> 40S % Recovery 100 98 100 100 85 <br /> Dup Result 11 10 11 31 52 <br /> MSD % Recov 110 100 110 103 87 <br /> RPD 95 20 95 33 19 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK031198 BLK031198 BLK031198 BLK031198 BLK031198 <br /> Prepared Date 3/11/98 3/11/98 3/11/98 3/11/98 3/11/98 <br /> Analyzed Date 3/11/98 3/11/98 3/11/98 3/11/98 3/11/98 <br /> Instrument I D ## GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked 10 pg/L 10 pg/L 10 pg/L 30 pg/L 60 pg/L <br /> I <br /> LCS Result 11 10 11 32 52 <br /> LCS % Recov 110 100 110 107 87 <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 /> A&EQUOIPNALYTICAL 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 1s to be used to validate the batch <br /> regory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9803523 GET <2> <br />