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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(925)988-9673 <br /> 5) 819819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-4275 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Christine Lillie Work Order # 9812C63-04 Reported Jan 6, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes _ _ BTEX as TPH- <br /> Benzene <br /> QC Batch# GC123098802009A GC123098802009A GC123098802009A GC123098802009A GC123098802009A <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 Westwater C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD # 8121895 8121895 8121895 8121895 8121885 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 12/30/98 12/30/98 12/30/98 - 12/30/98 - 12/30/98 <br /> Analyzed Date 12/30/98 12/30/98 12/30/98 12/30/98 12/30/98 <br /> Instrument I D # HP9 HP9 HP9 HP9 HP9 <br /> Conc Spiked 20 ug/L 20 ug/L 20 ug/L 60 ug/L 340 erg/L <br /> Result 21 22 23 70 330 <br /> MS % Recovery 105 110 115 117 97 <br /> Dup Result 21 22 22 68 320 <br /> MSD % Recov 105 110 110 113 94 <br /> RPD 00 00 44 29 31 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCS123098 LCS123098_ LC8123098 LCS123098 LCS123098 <br /> Prepared Date 12/30/98 12/30/98 12/30/98 12/30/98 12/30/98 <br /> Analyzed Date 12/30/98 12/30/98 12/30/98 12/30/98 12/30/98 <br /> Instrument I D # HP9 HP9 HP9 HP9 HP9 <br /> Conc Spiked 20 jug/L 20 ug/L 20 ug/L 60ug/L 340 ug/L <br /> LCS Result 20 20 21 65 320 <br /> LCS % Recov 100 100 105 108 94 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 50-150 <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 /> (106Eiap #1 1 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 /> �finterference,the LCS recovery is to be used to validate the batch <br /> gory <br />_� — Project Manager T ' - "*MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference ��_ 9812C63 BLA <2>__ <br />