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R) } <br /> Sequoia660 Chesapeake Dnve 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 /> Analytical 819 Striker Avenue Suite 8 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 <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9803524-09 Reporter! Mar 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> GIC Batch# GCO31198BTEX02A GC031198BTEX02A GC031198BTEX02A GC031198BTEX02A GCO31198BTEX02A <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 De Martini C DeMartinl C DeMartmi C DeMartini C DeMartlnl <br /> MS/MSD# 980339108 980339108 980339108 980339108 980339108 <br /> Sample Conc N D ND N D N D 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 # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10Ng/L 1opg/L 10ug/L 30,ug/L 60ug/L <br /> Result 89 86 86 26 64 <br /> of % Recovery 89 86 86 87 107 <br /> Dup Result 93 88 89 27 61 <br /> MSD % Recov 93 88 89 90 102 <br /> RPD 44 23 34 38 48 <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 1 D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10pg/L 10ug/L 10Ng/L 30ug/L 60Ng/L <br /> LCS Result 89 85 86 26 65 <br /> LCS % Recov 89 85 86 87 108 <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-tree matrix that is analyzed using the same reagents, <br /> 01.11OIA ANALYTICAL 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 /> 7ct- ol <br /> gary <br /> ger <br /> M <br /> anar **MS=Matrix Spike,MSO=MS Duplicate, RPD=Relative%Difference 9803523 GET <15> <br />