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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(9z5)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.C4 94954 (707)792-1865 FAX(707)792-0342 <br /> • <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-4275/980910-Z2 <br /> 1580 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9809721-01-11 Reported Sep 29, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes BTEX as TPH <br /> Benzene <br /> OC Batch# GCO91798802009A GCO91798802009A GCO91798802009A GCO91798802009A GCO91798802009A <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 J Minkel J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # 8091271 8091271 8091271 8091271 8091271 <br /> Sample Conc ND N D N D N D ND <br /> Prepared Date 9/17/98 9/17/98 9/17/98 9/17/98 9/17/98 <br /> Analyzed Date 9/17/98 9/17/98 9/17/98 9/17/98 9/17/98 <br /> Instrument I D # HP9 HP9 HP9 HP9 HP9 <br /> Conc. Spiked. 20Mg/L 20pg/L 20Ng/L 60Ng/L 250 pg/L <br /> Result. 21 22 22 69 290 <br /> MS % Recovery: 105 110 110 115 116 <br /> 140 Dup Result: 20 21 22 68 280 <br /> MSD % Recov.. 100 105 110 113 112 <br /> RPD 49 47 00 15 35 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCS091798 LCS091798 LCS091798 LCS091798 LCS091798 <br /> Prepared Date 9/17/,98 9/17/98 9/17/98 9/17/98 9/17/98 <br /> Analyzed Date 9/17/98 9/17/98 9/17/98 9/17/98 9/17/98 <br /> Instrument I D.# HP9 HP9 HP9 HP9 HP9 <br /> Conc Spiked 20 Ng/L 20 ug/L 20 Ng/L 60 pg/L 250 ug/L <br /> LCS Result. 21 22 23 71 280 <br /> LCS % Recov.. 105 110 115 118 112 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 60-140 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> �Elap# 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 /> gory <br /> ct Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 21-01-11 BLA <1> <br />